Dear Patients,

We welcome you to the practice ZWEICHIRURGEN at our two locations directly on the Rhine in the heart of Basel and in the old town of Liestal. ZWEICHIRURGEN was founded in October 2018 by the two surgeons Prof. Philipp Kirchhoff and PD Henry Hoffmann. Our concept is based on taking the time to hear your questions and problems and then creating a treatment strategy based on a comprehensive understanding of your individual needs. We will coordinate a seamless first consultation in our office and if necessary a hassle free short hospital stay in one of the top private clinics in Switzerland. In addition, we keep your general practitioner informed and updated on the outcome of your time under our care.

We offer our many years of surgical experience where we specialized on cutting edge treatments for all types of hernias and proctologic diseases. In addition we perform standard surgical procedures such as gallbladder and intestinal resections.

We aim to build a relationship of trust and a high quality surgical experience with you.

We look forward to your visit.
Unterschriften Dr. Debora Nowakowski    Prof. Dr. med. Philipp Kirchhoff    PD Dr. med. Henry Hoffmann

September 2022

ZweiChirurgen at 39th Davoscourse
Together with hernia experts from Europe PD Dr. Hoffmann was again in Davos as a speaker and instructor. Besides giving update talks on hernia surgery many surgical trainees were educated and trained in hernia techniques using plastic and pelvic-trainer models.

5th Swiss Hernia Days in Basel
Prof. Dr. Kirchhoff and PD Dr. Hoffmann from ZweiChirurgen managed to invite renown national and international hernia experts to Basel. 265 participants from 24 countries joined the Swiss Hernia Days at the Congress Center Basel, to discuss challenges and innovations in the field of hernia surgery. Besides the discussions and talks the anatomical workshop and the life-surgery were highlights of the conference. Since the foundation in 2017 «Swiss Hernia Days» have developed to one of the most successful and important hernia conferences in Europa

June 2022

ZweiChirurgen with modern Robotic technology in the OR
In the Merian-Iselin-Clinic ZweiChirurgen can use a surgical robot of the newest generation (Intuitive da Vinci Xi®). The surgery with the robot is performed in a classic laparoscopic technique, but it uses the «master-slave» configuration. The camera and the surgical instruments are mounted to a robot arm at the patient table. The surgeon sits on a console where he can manipulate the instruments and the camera using joysticks.

Besides the advantages of conventional minimal-invasive surgery (less pain, less complications, quicker return to work and social life after surgery) the robot offers a high-definition 3D vision, higher precision and degrees of freedom in the instrument handling and much better ergonomics for the surgeon. Especially in hernia surgery the use of the robotic system is increasing and will be an important tool for every future hernia surgeon.

ZweiChirurgen at Swiss Surgical Congress
ZweiChirurgen were active speakers and chairs in the session of the Swiss Hernia Society (SAHC) during the annual congress of the SSwiss Surgical Society (SGC) in Berne. News and trends in hernia surgery in Switzerland and Europe were discussed.


Mai 2022

ZweiChirurgen lecture at Dreiländertreffen in Wien
At the joint congress of minimally invasive surgeons from Austria, Germany and Switzerland, Prof. Dr. Philipp Kirchhoff gave a critical overview of the new extraperitoneal treatments for abdominal wall hernias and moderated the lively discussion.


April 2022

ZweiChirurgen at the 7th Salzburger Hernia Days
Together with experts from Europe and USA PD Dr. Hoffmann was invited as a session moderator and speaker to the 5th Salzburg Hernia Days to discuss current topics and innovations in hernia surgery. PD Dr. Hoffmanns talk was about alternatives to robotic surgery in hernia repair.


March 2022

ZweiChirurgen at International Hernia Congress
Together with other hernia experts from Europa, Asia and Africa PD Dr. med. Henry Hoffmann was invited speaker at the IHS congress in Athens, Greece. PD Dr. Hoffmann spoke about the surgical treatment strategies to repair diastasis rectify, which is a very frequent abdominal wall disease following pregnancies. More then 300 participants on-site and almost 1000 online participants followed this event.


Botox as an adjunct to large ventral hernia repair
ZweiChirurgen have published an important article in the „International Journal of Abdominal Wall and Hernia Surgery“ about their experience and results in using Botox (Botulinum Toxine A) for the repair of large ventral hernias. Botox is injected in the lateral abdominal wall muscles four weeks prior to surgery. This induces a temporary flaccid paralysis if this muscle group, enabling tension free closure of the abdominal wall hernia even in large, complex cases. Furthermore, patients report far less pain after surgery, when Botox is applied.

read the article

Botox to large ventral hernia repair
January 2022
2c Jahresbericht 2021

ZweiChirurgen Annual Report 2021
Our Annual Report 2021 is available for download (german).

December 2021

Team of ZweiChirurgen grows
We welcome Mrs. Rossella Loreto (middle) as competent practice assistant at ZweiChirurgen. She will support our fabulous practice assistant team starting in December 2021. Welcome to the team.

ZweiChirurgen team grows
November 2021

ZweiChirurgen at the annual congress for robotic surgery in Ghent (Belgium)
Dr Hoffmann is a speaker and moderator here together with international experts.


ZweiChirurgen with a new book publication!
PD Dr Henry Hoffmann and Dr Debora Nowakowski from ZweiChirurgen have again contributed to the second edition of «Facharztwissen Viszeralchirurgie». The chapter «Emergency Surgery» deals with the optimal care of acute, surgical abdominal diseases.

ZweiChirurgen Facharztwissen Viszeralchirurgie
October 2021
ZweiChirurgen at the joint Congress of the European and Americas Hernia Society in Copenhagen
More then 1000 participants went to Copenhagen to get updated at the joint congress of the European (EHS) and Americas Hernia Society (AHS) in the field of hernia surgery. PD Dr. Henry Hoffmann from ZweiChirurgen was invited as an expert to give lectures and moderate sessions. Also, for the first time there were exams to get the diploma for the new European surgical qualification in the field of «Abdominal Wall Surgery» (AWS). PD Dr. Henry Hoffmann was one examiners. Additionally, Prof. Dr. Kirchhoff and PD Dr. Hoffmann were awarded with the honorary diploma for the news surgical qualification «Abdominal Wall Surgery».


September 2021

ZweiChirurgen speak at the European Society of Coloproctology (ESCP)
At this year's virtual annual congress, Prof. Philipp Kirchhoff, spoke about the latest findings on the prevention of parastomal hernia.


ZweiChirurgen at ESCP 2021
ZweiChirurgen at hollister

Virtual contribution of the ZweiChirurgen at the Hollister Autumn Days 2021
Prof. Philipp Kirchhoff spoke in front of 70 stoma therapists about the topic «Parastomal Hernia» and led a lively discussion in Zurich.


ZweiChirurgen in important hernia workshop in Davos
PD Dr. Henry Hoffmann from ZweiChirurgen was again invited as an expert and instructor for the annual international hernia workshop in Davos. In the «Davoscourse» young surgeons learn basics but also advanced surgical techniques to treat hernias. More then 250 participants from 19 countries took part.


ZweiChirurgen with successful Swiss Hernia Days
Despite the difficult corona situation, Prof. Dr. Philipp Kirchhoff and PD Dr. Henry Hoffmann were able to organize the most important Swiss hernia congress for the fourth time. Participants and speakers from 18 countries found their way to Basel to discuss current developments and controversies in hernia surgery for two days. Website

Many thanks also to the OP Team of the Merian Iselin Klinik for the professional running of the Live-OPs.

ZweiChirurgen as experts at Hernien-Workshop
PD Dr. Henry Hoffmann as instructor and expert at the Hernia Workshop in Bad Saarow (Germany). Standards and new techniques in hernia surgery are taught to numerous surgeons from Germany, Austria and Switzerland.

Medizin im Grünen

ZweiChirurgen bei Workshop in Bad Saarow
August 2021
ZweiChirurgen Debora Nowakowski

Welcome Debora Nowakowski!
Debora Nowakowski, MD, is a specialist in surgery (FMH) and joins the ZweiChirurgen team of physicians with immediate effect. Dr. Nowakowski completed her specialist training at renowned clinics in Switzerland and most recently worked as a senior physician at the Bruderholz Cantonal Hospital.

We are happy and proud to welcome Dr. Nowakowski to our team.

July 2021
ZweiChirurgen with important publication regarding diastasic recti

ZweiChirurgen with important publication regarding diastasic recti
Together with co-authors from Austria, Germany and Switzerland PD Dr. Henry Hoffmann has published an important paper regarding repair of diastasis recti (DR). The main topic of the report was the standardized recording of the surgical repair of DR.

Over 40 different techniques are described of which most are not well evaluated with a low level of evidence. To improve the level of evidence, the surgical techniques of DR repair should be recorded in registers, such as the «Herniamed» registry.

Finally pain free...!
In episode 6 of his documentary «Alex Wilson's long road to Tokyo» released in july, the world-class sprinter reports how the operation of the groin at ZweiChirurgen finally allowed pain-free sprints and training sessions again. We keep our fingers crossed for Alex, the new European record holder over 100m and Swiss record holder over 200m for Tokyo! Go Alex...!

«Alex Wilson's long road to Tokyo — records, injuries and a tragic loss». The full story on Basel online (german/registration required)

ZweiChirurgen operating at the Merian-Iselin-Clinic

ZweiChirurgen operating at the Merian-Iselin-Clinic
From the 1st July on ZweiChirurgen will treat and operate their inpatient clients exclusively at the Merian-Iselin-Clinic. This clinic located in the center of Basel is of high renown in north-west Switzerland. Beside its high-quality and comfortable treatment if the patients the clinic provides a larger network of interdisciplinary cooperation between surgeons, urologists, gynecologists and orthopedic surgeons. website

June 2021

PD Dr. Henry Hoffmann and Prof. Dr. Philipp Kirchhoff receive «Honorary Diploma for Abdominal Wall Surgery» of the European Union of Medical Specialists (U.E.M.S.)
Due to their clinical and scientific experience and their commitment for the surgical education in the field of hernia surgery PD Dr. Henry Hoffmann and Prof. Dr. Philipp Kirchhoff received the «Honorary Diploma of Abdominal Wall Surgery» by the European Union of Medical Specialists (U.E.M.S.). This diploma is awarded to surgeons, who are highly specialized in hernia and abdominal wall surgery. The diplomas will be handed out during the joint congress of the European (EHS) and Americans Hernia Society (AHS) in October 2021 in Copenhagen, Denmark.


Hoffmann and Kirchhoff receive a Honorary Diploma for Abdominal Wall Surgery of u.e.m.s
4th Swiss Hernia Days 2021

Swiss Hernia Days 2021 confirmed
Organized by PD Dr. Henry Hoffmann and Prof. Dr. Philipp Kirchhoff from ZweiChirurgen the Swiss Hernia Days are confirmed to take place on the 9th and 10th September 2021 in Basel, Switzerland.

After a break in 2020 due to the Corona pandemic the two surgeons were able to invite renown national and International experts to Basel, to update Swiss surgeons in the field of hernia surgery. 300-400 participants are expected to join the congress in site at the Congress Center Basel.


April 2021

Publication alert regarding inguinal hernia repair
Together with colleagues from Austria and Germany PD Dr. Henry Hoffmann from ZweiChirurgen could publish an important work regarding risk factors in inguinal hernia repair. With this data it is now possible to evaluate the patients’ individual risk much better before the operation, which allows a better consenting process.


risk factors in inguinal hernia repair
Offene Hernienchirurgie

ZweiChirurgen as co-authors in a new standard book of hernia surgery
In the chapter «Bilateral transabdominal inguinal hernia repair in the Stoppa-technique» Prof. Dr. Philipp Kirchhoff and PD Dr. Henry Hoffmann describe tipps and tricks to successfully master this technique.

link (german)

March 2021

ZweiChirurgen as Experts at important Hernia conference
PD Dr. Henry Hoffmann was again one of the experts at the annual „Hernientage“ and «Herniamed Studientreffen». Together with expert colleagues from Austria, Germany and Switzerland he updated the virtually attending 600 participants on the newest trends and findings in hernia surgery. The topics PD Dr. Hoffmann was talking about were «Inguinal Hernia Repair in Male Patients - Influencing Factors in Outcome» and «News in the Parastomalen Hernia Repair».

5. HERNIAMED Studientreffen

February 2021
Dr. Henry Hoffmann in the Cantonal Hospital Aarau

Chronic Inguinal Pain — Cooperation beyond cantonal boarders
Chronic postoperative inguinal pain (CPIP) is a diagnostic and therapeutic challenge following inguinal hernia repair. For many years ZweiChirurgen are treating patients from all over Switzerland with this condition. Sometimes it is more convenient for the patients to get their surgery for CPIP close to their place of residence. This week PD Dr. Henry Hoffmann operated a patient with CPIP in the Cantonal Hospital Aarau with the referring colleague Dr. Alexander Gräfitsch, senior physician surgery.

link to Cantonal Hospital Aarau

January 2021

ZweiChirurgen Annual Report 2020
Our Annual Report 2020 is available for download (german).

2c Jahresbericht
November 2020
Two Years ZweiChirurgen

ZweiChirurgen celebrating 2-year anniversary

Exactly two years ago at the 5th November 2018 ZweiChirurgen started their practice and treated the first patients in the heart of Basel.

We would like to thank all patients, referring doctors and colleagues for their trustful collaboration.

October 2020

ZweiChirurgen with exciting publication

Together with colleagues from Germany and Austria PD Dr. Henry Hoffmann from ZweiChirurgen has investigated the trends in incisional hernia repair in the last decade using data from the European Herniamed registry. The result was surprising but also expected: the new minimally invasive techniques such as MILOS are on the rise. In contrast to the conventional laparoscopic techniques, the implanted mesh to support the abdominal wall is moved from inside the abdominal cavity to an extraperitoneal layer behind the abdominal wall muscles to avoid contact with the viscera. Therefore, the MILOS repair is the standard for the repair of ventral hernias at ZweiChirurgen.

link to the article

ZweiChirurgen Publication
September 2020
ZweiChirurgen innovation price

ZweiChirurgen with important publication

Together with colleagues from all over the world Prof. Dr. Kirchhoff from ZweiChirurgen has published a very important work in the highly ranked medical journal «BMJ». Analyzing more than 2500 operations the researcher team developed a classification of intraoperative complications, called IntraClass. Based on this new classification system intraoperative complications can be assessed more easily, and subsequent postoperative management of surgical patients can be improved to enhance patient safety. Results of the study and the evaluated classification were also convincing to the Swiss Academy of Quality in Medicine (SAQM), which awarded this work with the «Innovation Quality Price» 2020 in the category patient safety.

Read the article (pdf)
Article on BMJ (pdf)
The Certificate (pdf)

August 2020

The Team grows

we warmly welcome Ms. Melanie Steiger as our new practice assistant to the team of ZweiChirurgen.

ZweiChirurgen warmly welcome Melanie Steiger
July 2020
ZweiChirurgen publication

PD Dr. Henry Hoffmann and Prof. Dr. Philipp Kirchhoff from ZweiChirurgen have again published an important article in a renown surgical journal

In the publication risk factors contributing to the complications and the outcomes of recurrent incisional hernia surgery were analyzed. This helps surgeons worldwide to better adjust the individual risk of patients undergoing such surgery.

link to the publication

June 2020

The fastest man of Switzerland successfully operated by ZweiChirurgen

The Swiss sprint star and fastest man Alex Wilson, record holder over 100m and 200 sprint and 3rd at the European Championship 2018 in the 200m sprint was successfully operated last week by Prof. Dr. Philipp Kirchhoff and PD Dr. Henry Hoffmann from ZweiChirurgen.

Now, Alex can fully concentrate on the preparations for the 2021 Olympic Games in Tokyo. ZweiChirurgen kepp their fingers crossed for the upcoming races.

ZweiChirurgen operated on Alex Wilson
April 2020
ZweiChirurgen Praxisbetrieb

ZweiChirurgen start normal business at 27th April 2020

According to the federal statements by the BAG we can start normal practice mode at the 27th April 2020 during the ongoing Corona-Pandemic. Therewith, you cannot only contact us, if you suffer from an emergency or urgent problem, but also - as usually - if you have other issues.

Of course we will continue to obey the strong hygienic measures for all our patients in our practice. As long as the Corona-Pandemic is still affecting Switzerland, we would like to ask you keep your appointment unchaperoned. Please get in touch with us to make an appointment or us our convenient online booking tool via our website.

Book an appointment

ZweiChirurgen zum Corona-Virus

Patient information during Corona crisis

Our practice will remain open during the Corona-pandemic. Please register our information regarding the processes in our practice during the next week.

  1. All processes in our practice following strict hygienic guidelines and the inputs of the federal health care authorities (BAG).
  2. All human beings are potentially contagious, although typical Corona symptoms such as fever, cough and snuffles may be absent. Therefore, we maintain the highest standards of hygienic measures in our practice by keeping distance when possible and avoiding unnecessary physical contact. We offer disinfection dispensers in our practice to keep clean hands. Since we have almost no waiting time, the risk of getting infected during you visit is very low.
  3. To further reduce the number of persons being in the practice, we will reduce the staff to its necessary minimum.
  4. Due to the federal health care authorities (BAG) act, we need to postpone all planned elective surgeries for the next couple of weeks. All hospitals will inform the affected patients. As soon as the normal business can be re-initiated, we will get in contact with you to plan you ne surgery appointment as early as possible. If your symptoms get worse during the surgery lock-down please inform us as soon as possible. Urgent or emergency surgeries can be performed at any time.
  5. Surgical emergencies: Many health care providers and family doctors in Basel have been informed, that we would like to help the emergency departments of the hospitals by treating some surgical emergency patients in our practice from 8am - 6pm. These are cases such as abscesses, superficial cutting or stabbing injuries and proctological acute problems (e.g. acute anal pain, swelling or bleeding).
Thank you very much again for your trust and understanding. Please don’t hesitate to call us, if you have further questions.

Surgical emergencies during Corona-crisis

Surgical emergencies make no break during the Corona pandemic. Beside washing your hands regularly, social distancing and avoiding larger gatherings is of utmost importance to slow down the virus disease. Therefore, we offer treatment of emergency cases in our practice, where you can avoid larger gathering with almost no waiting time. We also help to relieve the pressure from the hospitals emergency departments, which need all their power to fight the Corona pandemic.

After telephonic registration we offer treatment of following surgical emergencies:

  • Abscesses
  • Cutting or stabbing injuries of the skin
  • Proctological emergencies: acute anal pain, swelling and bleeding
Please don’t hesitate to contact us.

Dear Patients,

The Corona visors has reached Switzerland. Although there is no reason to panic since most infected patients will not even develop symptoms, we take the infectious disease very serious. The best way to contain the spread of the virus is to consider very simple but efficient hygienic advises.

  1. Wash or disinfect your hand several times per da. We offer hand disinfection dispenser in our practice.
  2. Avoid shaking hands.
  3. Cough and sneeze in a handkerchief or your elbow. Sneezing into your hand must be avoided.
  4. Keep distance to larger gatherings.
  5. If you suffer from cough and fever, please stay at home. Contact us by phone or email to manage your appointments.
Please find more information about the Corona virus and thing you can do, to prevent infection at the homepage of the Swiss national health office BAG:

Thank you very much for your appreciation.

April 2020
ZweiChirurgen „Dealing with Hernia risk factors

ZweiChirurgen published a new scientific journal article

Together with experts from Germany and Austria PD Dr. Henry Hoffmann and Prof. Dr. Philipp Kirchhoff published an article in the renown surgical journal «Hernia» dealing with risk factors during surgical repair of incisional hernias. Results of this work contribute to the important consenting process ahead of such a surgery, addressing individual patients’ risk factors.

Read the article

March 2020

ZweiChirurgen at the annual surgical Tripartite Meeting

Together with other national and international experts Prof. Dr. Kirchhoff was invited to the annual Tripartite meeting for minimally-invasive surgery in Geneva. Acting as a speaker and moderator, Prof. Kirchhoff updated the participants in minimally-invasive hernia surgery.

Tripartite Meeting

ZweiChirurgen at Swiss-MIS
February 2020
ZweiChirurgen at PhysioSwiss

ZweiChirurgen at PhysioSwiss

Diastasis of recti is defined as the separation of the rectus muscles in the midline of the abdomen, which often appears after pregnancies. Prof. Dr. Kirchhoff and PD Dr. Henry Hoffmann from ZweiChirurgen have given a lecture at the PhysioSwiss education program to update the present physiotherapists about the latest treatment options for this disease.

January 2020

Competency and Quality crossing cantonal boarders

PD Dr. Henry Hoffmann from ZweiChirurgen and his Ticino colleague Dr. Andrea Donadini from Swiss Surgical Practice (Lugano) have successfully operated a joint patient in Lugano.

Dr. Henry Hoffmann and Dr. Andrea Donadini

Swiss Hernia Society (SAHC) official chapter of the European Hernia Society (EHS)

Thanks to the close and collaborative work of PD Dr. Hoffmann, Prof. Dr. Kirchhoff and other members of the SAHC faculty, an important step for the Swiss hernia surgery has been made: The SAHC has officially been accepted as a national chapter of the European Hernia Society (EHS). From now on, the collaboration with other European working groups regarding e.g. teaching and quality control in hernia surgery can be intensified. Also, the SAHC has now active influence in the EHS processes and decisions.

Schweizer Arbeitsgemeinschaft für Hernien-Chirurgie (SAHC)
Europäischen Herniengesellschaft (EHS)

Our Office

Located in the historical neighborhood of St.Johan Vorstadt, we offer you a charming yet modern experience mixing architectiural design in a former book printing press build in 1xxx. Although this space has been converted into a doctor’s office you will enjoy our attention to detail, giving you the feeling of privacy and warmth. Your consultation itself will be in the Dr.’s private offices with gorgeous views of the Rhine.

In addition to the reception and waiting room, the practice offers a meeting room and an intervention room. Here, we perform proctologic examinations and minor procedures under local anesthesia. We are equipped with state of the art instruments including a special Yag laser and a high-resolution examination camera. We are proud to say that our office and restroom are wheelchair accessible.

Doctors and employees

Prof Dr. Philipp Kirchhoff

PD Dr. Philipp Kirchhoff

Philipp Kirchhoff is a specialist in coloproctology and hernia surgery and teaches as a professor at the University of Basel.

From 1996 to 2003 he studied medicine at the Universities of Freiburg, Vienna, Yale and Berlin. Philipp Kirchhoff began his surgical training at the University Hospital of Zurich and worked at various Swiss hospitals during his training.

After obtaining his specialist title in surgery, he completed two years of research at Yale University (New Haven, CT USA). There he developed a new drug for the treatment of heartburn as part of his project. After his return, he worked as a senior physician at the Clinic for General and Visceral Surgery at the University Hospital of Basel since 2010 and habilitated in 2011 based on his research on "The Regulation of Gastric Acid Secretion".
Philipp Kirchhoff subsequently completed a clinical fellowship at Cambridge University (U.K.) with a focus on minimally invasive colon surgery and proctology. In this field, he subsequently obtained the European Coloproctological Specialization (ESBQ). Until 2018 Philipp Kirchhoff was the senior consultant at the Clinic for Visceral Surgery at the University Hospital of Basel where he was in charge of general and private patients, resident training and department management.

Philipp Kirchhoff is the inventor and developer of KORING®, a polyurethane ring device for the prevention of parastomal hernias. His surgical focus is on the surgical treatment of rectal diseases and hernia surgery. He is a reviewer of several international professional journals and a member of numerous surgical societies (SGC, SGVC, DHG and EHS) and international professional committees. Prof Dr. med. Philipp Kirchhoff was appointed by the medical faculty Basel as a Associate Professor in november 2019.

Together with his colleague PD Dr. med. Henry Hoffmann he is the founder of the Swiss Hernia Days. Philipp Kirchhoff speaks fluent German and English.

PD Dr. Henry Hoffmann

PD Dr. Henry Hoffmann
Henry Hoffmann is a general surgeon (FMH) and a specialist in Abdominal Wall and Hernia Surgery (EBSQ Abdominal Wall Surgery), a doctor of medicine and a private lecturer at the University of Basel.

After completing his surgical specialist training in Switzerland, he worked from 2013 to 2018 as a senior physician in the Clinic for General and Visceral Surgery at the University Hospital of Basel. In 2011/2012, PD Dr. Hoffmann completed a clinical fellowship in Great Britain, where he received further training in colorectal and hernia surgery. He then completed a year of research focusing on minimally invasive surgery and VR simulation in surgery.

During his many years as a consultant at the University Hospital of Basel, he successfully managed projects aimed at improving patient safety, speeding recovery from abdominal surgery and quality assurance in hernia surgery. He is particularly interested in quality-assured hernia surgery, and the treatment of sportsmen's groin and chronic groin pain.

PD Dr. Hoffmann holds a certificate of competence in "Laser Treatment of the Skin and Mucous Membrane" (Type I and II), co-founded the Swiss Hernia Days, is a reviewer of several internationally renowned specialist journals and a member of numerous surgical societies (SGC, SGVC, DGCH, DGAV, DHG and EHS). Henry Hoffmann is fluent in German, English and Italian.

Dr. Debora  Nowakowski

Dr. Debora Nowakowski
Debora Nowakowski is a specialist in surgery (FMH) and the youngest member of the ZweiChirurgen medical team.

From 2004 to 2010, the native of Grisons studied medicine at the universities of Fribourg and Basel. She then began her surgical residency at the "Universitätskinderspital beider Basel" (UKBB), followed by further years of training at the St. Claraspital Basel and the University Hospital Basel. At the University Hospital Basel, Dr. Nowakowski was also trained for a longer period of time by Prof. Dr. Kirchhoff and PD Dr. Henry Hoffmann.

After obtaining the specialist title for surgery (FMH), Dr. Nowakowski worked as a senior physician at various renowned hospitals in Switzerland, including the Cantonal Hospital Olten, the Linth Hospital (Uznach) and most recently at the Cantonal Hospital Baselland. There she was able to further deepen and expand her surgical skills and abilities.

In recent years, hernia surgery, general surgery and proctology have become the focus of Dr. Nowakowski's professional and specialist activities. In addition, she regularly participates in national and international congresses to further expand her professional expertise.

Dr. Nowakowski is married, the mother of two sons and, after several years of professional training at various clinics in Switzerland, now makes her home with her family in the Basel region

Debora Nowakowski is fluent in German, English, French and Dutch.


Katja Ulrich, MPA

Katja Ulrich
Katja Ulrich completed her training as a medical practice assistant at the Woodtli School in Zurich.

She gained her first practical experience in a general family practice. She was then employed in a physiotherapy practice and finally worked in a large private orthopedic-surgical clinic in Basel. During this time she was responsible for, among other things, planning and coordinating the appointments of the numerous surgeons and surgeries.

Ms. Ulrich is fluent in German, French, English and Italian.

Melanie Steiger, MPA

Melanie Steiger
Melanie Steiger was trained as a medical practice assistant in a urological practice in Lörrach (Germany).

After finishing her training years she was responsible for organizing the practice and assistance in the OR. Since August 2020 she is part of the team ZweiChirurgen.

Ms. Steiger speaks German, Englisch and Russian.

Rosella Loreto

Rosella Loreto
Rosella Loreto completed her training as a medical practice assistant at the Huber Widemann School in Basel.

In a group practice she was able to deepen her knowledge in various fields such as gynecology, pediatrics, general medicine, internal medicine and also in the field of diabetes. Afterwards, Ms. Loreto gained valuable experience in an orthopedic practice. After successfully completing further training as a medical practice coordinator, she was responsible for human resources and quality management in a family practice.

Frau Loreto is fluent in German, Italian and English

Memberships in professional societies

  • SAHC (Schweizerische Arbeitsgruppe für Hernienchirurgie)
  • VSAO (Verband Schweizer Assistenz – und Oberärzte)
  • FMH (Verbindung Schweizer Ärztinnen und Ärzte)
  • SGC (Schweizer Gesellschaft für Chirurgie)
  • ESCP (European Society of Coloproctology)
  • SGVC (Schweizer Gesellschaft für Viszeralchirurgie)
  • DHG (Deutsche Herniengesellschaft)
  • EHS (Europäische Hernien Gesellschaft)
  • DGAV (Deutsche Gesellschaft für Allgemein- und Viszeralchirugie)
  • IEHS (International Endohernia Society)

Memberships in Advisory Boards

  • Parastomal Hernia Prevention Faculty, European Society of Coloproctology (ESCP) (P. Kirchhoff)
  • International Endohernia Society (IEHS) (H. Hoffmann)
  • European Hernia Advisory Board (H. Hoffmann)

Reviewer for medical journals

  • Annals of Surgery
  • World Journal of Surgery
  • Journal of Surgical Innovation
  • Diseases of the colon and rectum
  • Surgical Endoscopy

Guidelines and consensus conferences

1. Minimally invasive surgical techniques in ventral hernia repair. Update of the International Endohernia Society (IEHS) Guidelines. Peking, China, 2017.

2. Preoperative adjunct interventions in ventral hernia repair. Update of the International Endohernia Society (IEHS) Guidelines. Peking, China, 2017.

3. Sportsman groin: Role of clinical examination and radiological imaging. Consensus Guideline Conference, German Hernia Society (DHG). Hamburg, 2017

Hernia Surgery

A hernia is a defect in the abdominal wall from which the contents of the abdomen protrude outwards from under the skin. Patients generally see a swelling and have discomfort or pain. Hernias are the most common surgical indication, and around 20,000 hernia operations are performed throughout Switzerland every year. The inguinal hernia is the most common, followed by hernia of the abdominal wall (e.g. umbilical hernias, scar hernias) flowed by rare causes such as flank hernia and diaphragmatic hernias.

At our centre for hernia surgery we offer you competent and tailor-made advice and diagnostics. Depending on the clinical picture and the individual requirements of our patients, we perform open (larger skin incision) and minimally invasive surgical techniques (keyhole surgery) in accordance with current scientific findings and guidelines. Our many years of surgical experience enable us to offer you a surgical technique tailored to your needs. For minimally invasive operations, in many cases we also use a latest-generation surgical robot (Intuitive da Vinci Xi) which uses a 3D image to allow us to use the instruments even more precisely and gently.

We perform our operations at our exclusive partner, Merian-Iselin-Klinik in Basel. This clinic located in the center of Basel is of high renown in north-west Switzerland.In addition, we have specialized in the treatment of sportsmen's groin, chronic groin pain after hernia operations and rectus diastasis. These diseases are complex and must be treated together with other specialists and therapists. Here we can rely on a network of experienced sports physicians, physiotherapists, radiologists and pain therapists.

Our patients are also individually cared for and treated by us after the operation. We remain available for you at all times. Within the framework of our "quality-assured hernia surgery", we also send out follow-up questionnaires after the operation in order to identify new problems early on and treat them professionally.


The seal «Quality assured Hernia Surgery» was awarded to us by the Deutsche Herniengesellschaft

Treatment spectrum of different types of hernia

Incisional Hernia

Inguinal Hernias

Open approaches
  • Operation without mesh (Shouldice)
  • Operation with mesh (Lichtenstein)
Minimally-invasive approaches
  • Operation in the preperitoneal space (TEP)
  • Operation with laparoscopy (TAPP)

Umbilical Hernias

Direct fascial closure in umbilical hernias (<1cm)

Open approaches
  • Retromuscular mesh reinforcement (Rives-Stoppa)
  • Preperitoneal umbilical mesh placement (PUMP operation)
Minimally-invasive approaches
  • Extraperitoneal mesh implantation using laparoscopy (TAPP, extended TEP)
  • MILOS operation (Minimal or Less Open Surgery)
  • SCOLA operation (Subcutaneous Onlay Laparoscopic Approach)
Umbilical Hernia

Incisional Hernias

Open approaches
  • Retromuscular mesh reinforcement (Rives-Stoppa)
  • Preperitoneal umbilical mesh placement (PUMP operation)
Minimally-invasive approaches
  • Extraperitoneal mesh implantation using laparoscopy (TAPP, extended TEP)
  • MILOS operation (Minimal or Less Open Surgery)

Large ventral hernias
(horizontal hernia diameter >8cm)

  • Retromuscular mesh reinforcement (Rives-Stoppa)
  • Endoscopic anterior component separation (ECS) according to Joergensen
  • Open posterior component separation (Transversus abdominis release, TAR)
  • Preoperative infiltration in the lateral abdominal wall muscles

Treatment spectrum of other abdominal wall diseases

Diastasis recti (Deviation of the rectus muscles)

  • Physiotherapy
  • ELAR operation (endoscopic linea-alba reconstruction)
  • Plastic surgery (e.g. abdominoplasty)
  • MILOS (Mini Less Open Surgery)

1. Normal situation
2. Diastasis recti (Straight abdominal muscles diverged)
3. Condition after surgery

Sportsman groin

  • Physiotherapy
  • Open approach: minimal-repair
  • Minimally-invasive approach (TAPP, TEP)

Chronic postoperative inguinal pain (CPIP)

  • Interdisciplinary diagnosis and treatment (Radiology, pain specialist, physiotherapy, hernia specialist)
  • Pain mapping
  • Infiltration of local anesthetics
  • Laparoscopic and open neurectomy


Proctology deals with the diagnosis and treatment of diseases of the rectum. Common diseases of the rectum include hemorrhoids and anal fissures. In our center for proctology we offer you competent and comprehensive consultation, diagnostics and the complete therapy spectrum for all diseases of the rectum.

Consultations, examinations and minor procedures take place in our practice. For certain examinations (e.g. colon and gastroscopy) we work closely together with gastroenterologists and other specialists. Should an operation be necessary, we perform it at our exclusive clinic partner Merian-Iselin-Clinic in Basel.

Treatment spectrum of various proctological diseases

Sinus pilonidalis (sacral dermoid)

  • Minimally-invasive techniques
  • - Closure using Laser-obliteration (SiLaT operation)
    - Sinusectomy («pit picking»)
    - Phenol-Injection
  • Radical surgical excision and primary closure (Bascom / Karidakys operation)
  • Excision and flap techniques (Limberg-flap, V-Y-plastic)
  • Incision of pilonidal abscesses
Fistula laser technology


  • Conservative treatment
  • Rubber band ligation
  • Laser-coagulation of hemorrhoids
    (Operation after Ferguson or Milligan Morgan)
  • Surgical resection of hemorrhoids
  • Surgical stapler resection of hemorrhoids

Anal fissure

  • Conservative treatment
  • Surgical debridement of the fissure
  • Surgical resection of the fissure
  • Relaxation of the sphincter muscle using BTA
Anal fistulas

Anal fistulas

  • Sphincter-preserving Laser coagulation of the fistula tract (FiLaC)
  • Sphincter-preserving fistula plug
  • Closure of the fistula with a ligation (LIFT operation)
  • Closure of the fistula with mucosa advancement flap (so called Mucosaflap)
  • Surgical excision if the fistula tract (fistulectomy)
  • Lay-open fistulectomy
  • Closure of internal fistula orifice using clips (OVESCO clips)
  • Closure of the fistula tract using paste

Incision of pilonidal abscesses

  • Conservative treatment
  • Surgical incision

Perianal skin tags (mariscs)

  • Surgical excision

Condyloma (perianal warts)

  • Conservative treatment
  • Surgical techniques in local anesthetics - Cryotherapy - Laser coagulation
  • Surgical excision of larger warts

Diagnostics and follow-up of HPV-infection
(human papilloma virus)

  • Brush cytology
  • Annual examinations using high-resolution anoscopy (HRA)
  • HPV vaccinations

Perianal epithelium dysplasia

  • Local treatment
  • - creams
    - ointments
    - acetic acid
    - Cryoablation
  • Surgical resection of larger skin dysplasia

Anal carcinoma

  • Interdisciplinary diagnostics and treatment

Rectal prolapse

  • Conservative treatment (stool regulation)
  • Local excision of excessive mucosa
  • Transanal excision of excessive anal mucosa and rectum muscle gathering (Delorme operation)
  • Transanal complete resection of the anal prolapse (Altemeier operation)
  • Transanal stapler resection of the rectum (STARR operation)
  • Transabdominal minimally-invasive lift of the prolapse (D’Hoore operation)

Anal incontinence

  • Conservative treatment
    - Pelvic floor physiotherapy
    - Biofeedback training
    - Stool regulation
  • Surgical sphincter reconstruction
  • Minimally-invasive silicone implants
  • Radiofrequency ablation (RFA, Secca-operation)

Perianal pruritus (itchiness)

  • Consultation
  • Identification of pruritus source
  • Development of treatment strategies

Constipation and diarrhea

  • Consultation
  • Identification of constipation and diarrhea source
  • Development of treatment strategies

General Abdominal Surgery

In addition to hernia surgery and proctology, we also offer the treatment of various diseases of the abdominal organs. These include diseases of the gallbladder (gallstones - see picture -, gallbladder inflammation, gallbladder colic) as well as diseases of the small and large intestine.



Excision of any skin pathologies
  • moles
  • lipomas
  • scars

Small intestine

  • Removal of parts of the small intestine in case of tumorous changes
  • Removal of adhesions
  • Diagnostic laparoscopy

Large intestine (colon)

Removal of parts of the colon in various diseases
  • diverticular disease
  • adenomas
  • polyps


Minimally invasive or open removal
  • gallstones
  • inflammation
  • adenomas


In our practice we treat patients of all insurance classes and health insurance companies.

Here you can make an appointment directly with the two surgeons, call us or write an e-mail to our practice.

If you are insured in the general practitioner model (HMO), you should have your general practitioner refer you to us.

In urgent cases, we will try to give you an appointment on the same day.

International Patients

We are warmly welcoming our international guests in our practice. We speak German, English, French, Italian and Russian. For your request please contact us via E-Mail.

As soon as we have booked your appointment, we are happy help with the organization of your stay in Basel during the diagnostic and treatment including transfers and hotel accomodation.

Patient Referral

You can refer your patients to us at any time by telephone, email or fax with the following information: first and last name, date of birth, contact details of the patient, diagnosis and insurance. This will help us to coordinate your appointments smoothly.

Contact us

St. Johanns-Vorstadt 44
CH-4056 Basel
Phone +41 61 7119000
Fax +41 61 7119005

Make an appointment
E-mail to the office
All insurance classes and consultation possible without GP referral (except insurance in the GP model)


Book chapters

1. Philipp Kirchhoff, Tarik Delko, Facharztprüfung Chirurgie (2. Auflage), Gutartige Erkrankungen der Appendix und des Kolons, EMH Scripts

2. Philipp Kirchhoff, Urs Zingg, Operatives Risiko, Facharztprüfung Chirurgie (2. Auflage), EMH Scripts

3. Savas Soysal, Tarik Delko, Philipp Kirchhoff, Gutartige Erkrankungen der Appendix und des Kolons, Facharztprüfung Chirurgie (3. Auflage), EMH Scripts, (HRSG.: Daniel Oertli, Philipp Kirchhoff)

4. P. Kirchhoff und H. Hoffmann. Stoppa-Technik. In: U. Dietz, G. Beldi, R. Fortelny, A. Wiegering (Eds.): Offene Hernienchirurgie, Springer (2018)


5. Hoffmann H. und Kirchhoff P. Primäre Inguinalhernien-Chirurgie. In: Facharztprüfung Chirurgie, 3. Auflage. EMH Scripts (2018).

6. Weixler B, Hoffmann H. Darmischämie. In: Facharztwissen Viszeral- und Allgemeinchirurgie, Springer (2017)

7. Philipp Kirchhoff, Henry Hoffmann, Operatives Risiko, Facharztprüfung Chirurgie (3. Auflage), EMH Scripts, 2018, (HRSG.: Daniel Oertli, Philipp Kirchhoff)

8. Chronische Bauchschmerzen, Kapitel: Intraabdominelle Verwachsungen
Philipp Kirchhoff, Markus von Flüe, Herausgeber: Prof. Buchmann, Prof. Degen


Facharztbuch Facharztprüfung Chirurgie, Dritte Auflage 2018 EMH Scripts, (HRSG.: Daniel Oertli, Philipp Kirchhoff)


leading medicine Guide

Leading Medicine Guide

The Leading Medicine Guide sees itself as a neutral mediator of competent specialists. More than 250 highly qualified specialists work for you in various specialist fields and are selected according to strict quality criteria. website offers you competently researched information about hernias and their treatment. You will also find experts for hernia surgery, who you can contact free of charge. website



The Swiss company Medgate quickly offers comprehensive medical care by telephone or Internet with the aim of improving health care. In doing so, it draws on local partners, doctors and networks in order to provide patients with the best and fastest possible treatment for their complaints. website



The Merian-Iselin-Clinic is one of the leading private surgical clinics in Switzerland. Based on a high-quality patient care and trustful interdisciplinary cooperation between surgeons and anesthetists the Merian-Iselin-Clinic provides one of the best performance profiles in north-west Switzerland.

With this clinic ZweiChirurgen have a clinic partner on their side to cope with the highest needs of our patients. website


In order to improve the results and quality of hernia surgery, the non-profit company Herniamed was founded in 2009. It is a network of hernia surgeons.

The core of the Herniamed project is an Internet-based quality assurance databank. Here, clinics and established surgeons can enter data regarding their hernia operations free of charge. The data is recorded and according to scientific standards which helps in the analysis and eventual interpretation of results. On the basis of these results, the experts can then work out the best future therapy options for patients. website

Swiss Hernia Days

The Swiss Hernia Days offer hernia experts an annual platform on the latest developments in hernia surgery. The congress takes place annually in Basel and is chaired by international hernia specialists.

The event was initiated in 2017 by Dr. Jan Kukleta (Zurich), PD Dr. Henry Hoffmann and PD Dr. Philipp Kirchhoff (Basel). website