Thomas Köstler

Thomas Köstler was born in Zurich in 1968.
He spent his childhood and adolescence in various places in Switzerland, amongst them Lausanne, the Valais and the Basel region.

He graduated from school in Münchenstein near Basel in 1987. This was followed by a 6-year study of medical science. He graduated from his studies with a medical degree from the university Basel at the beginning of November 1993.

He started his doctorate thesis during his studies and was granted his PhD from the university Basel in January 1994.

His professional career began in March 1994 and it carried him from assistant doctor of Delémont over Brig (in Valais) to the canton hospital in Winterthur where he reached the maturity for medical specialist in surgery in 2000.

His two daughters Sarah and Annika were born during his formation period (1994 and 1996) and later his two daughters Sofia (2018) and Maxima (2019). Dr. Köstler is married to the lawyer Selime Berk, Maxima and Sofia are the two joint children.
He was able to gain first experiences as head physician in the regional hospital Lachen, before he changed in January 2002 to the hospital Limmattal, also as head physician.

There he was promoted deputy senior physician in 2004 and since 2006 he has been the leading doctor for surgery at the hospital Limmattal near Zurich.

Dr. Köstler gained the focus titles for general surgery and traumatology as well as for visceral surgery at the hospital Limmattal. During the last few years he has been specializing in bariatric surgery (obesity surgery).

In this area he counts as one of the most experienced surgeons in the whole of Switzerland with a total of over 3000 bariatric operations. Right now he is chief doctor for surgery at the hospital Limmattal and is the head of the interdisciplinary obesity team.

Between 2012 and 2017, he held the position of consulting physician for bariatric surgery at the University Hospital Basel. Here he leads the bariatric surgical team.

He uses his spare time which remains after his high professional commitment, mostly for sporting activities (mountain tours, mountain biking, etc.) and for reading. His hobbies also include adventure holidays to foreign cultures.

Curriculum Vitae


Obtainment of the focus title «Visceral surgery»

Obtainment of the focus title, «General surgery and traumatology»

Specialized doctor for surgery FMH

Promotion (PhD), University Basel

Doctor diploma, University Basel

Career path

since 2006
Chief physician surgery, hospital Limmattal, Schlieren

2004 – 2005
Deputy senior physician hospital Limmattal, Schlieren

2002 – 2004
Head physician, hospital Limmattal, Schlieren

2000 – 2001
Head physician, regional hospital Lachen

1994 – 2000
Assistant doctor at the Kreisspital Brig, regional hospital Delémont and cantonal hospital Winterthur


Special interests
Bariatric surgery (gastric bands, various gastric bypasses, biliopancreatic diversion, revision procedures, etc.).


mother tongue

very well spoken and written

well spoken and written


Primary non-closure of mesenteric defects in laparoscopic Roux-en-Y gastric bypass: reoperations and intraoperative findings in 146 patients.

Delko T, Kraljević M, Köstler T, Rothwell L, Droeser R,
Potthast S, Oertli D, Zingg U.
Surg Endosc. 2015 Sep 3.

PubMed | PDF

Revisional versus primary Roux-en-Y gastric bypass: a case-matched analysis.

Delko T, Köstler T, Peev M, Esterman A, Oertli D, Zingg U.
Surg Endosc. 2014 Feb.

PubMed | PDF

Influence of additional resection of the gastric fundus on excessive weight loss in laparoscopic very very long limb Roux-en-Y gastric bypass.

Delko T, Köstler T, Peev M, Oertli D, Zingg U.
Obes Surg. 2013 Mar

PubMed | PDF

Effect of new technologies on diagnosis and therapy of acute appendicitis.

Gianom D, Köstler T, Goti F, Decurtins M.
Praxis (Bern 1994). 2002 Feb 13;91(7):275-84. German.


Eine modifizierte Methode zur Herstellung vitaler Skelettmuskelzell-Suspensionen

(Dissertation Dr. Th Köstler, 1994, Universität Basel)

Speeches and contributions at International conferences

7. Adipositas Symposium 2014 – European Surgical Institute – Norderstedt

Evidenz zu den verschiedenen Typen des Roux-en-Y-Magenbypass und zum Minibypass
Th. Köstler

Congrès annuel de la société Francaise et Francophone SO.FF.CO 2013

Etude prospective comparative du bypass gastrique primaire par laparoscopie avec le bypass gastrique par laparoscopie après l’anneau gastrique en une étape
Th. Köstler, T. Delko

17th Worlds Congress of IFSO 2012 – New Dehli

Laparoscopic conversion of failed gastric bypass to biliopancreatic diversion: an alternative method to improve weight loss
T. Delko, Th. Köstler

16th Worlds Congress of IFSO 2011 – Hamburg

Midterm results of the very, very long limb Roux-en-Y gastric bypass with and without additional fundus resection
T. Delko, Th. Köstler

51. Österreichischer Chirurgenkongress 2010 – Linz

»VVLL-Magenbypass mit und ohne zusätzliche Magenfundusresektion:
vergleichende Studie zum Gewichtsverlauf nach 12 Monaten»
T. Delko, Th. Köstler

«Ein Koagelpropf an der Entero-Enterostomie nach Magenbypassoperation: Eine potentiell lebensgefährliche Frühkomplikation»
T. Delko, Th. Köstler

«Gewichtsrebound bei Magenbandträgerin nach stumpfem Abdominaltrauma»
T. Delko, Th. Köstler

127. Kongress der deutschen Gesellschaft für Chirurgie 2010

«Laparoskopische Konversion des Magenbypass in eine biliopankreatischen Diversion bei Gewichtsrebound: prälaminäre Resultate»
M.K. Jung, T. Delko, Th. Köstler

«Obstruierendes Blutkoagel in der Jejunojejunostomie nach laparoskopischem Magenbypass»
T. Delko, M.K. Jung, Th. Köstler

50. Österreichischer Chirurgenkongress 2009 – Wien

«Laparoskopische Versorgung der Neoblasenperforation – Ein Fallbeispiel mit Literaturübersicht»
M. von der Groeben, Th. Köstler

125. Kongress der deutschen Gesellschaft für Chirurgie 2008

«Innere Hernien nach laparoskopischem Magenbypass»
R. Fahrner, Th. Köstler

«Die winkelstabile volare Plattenosteosynthese der distalen Radiusfraktur: Korreliert das Röntgenbild mit dem funktionellen Outcome?»
M.K. Jung, Th. Köstler

47. Österreichischer Chirurgenkongress 2006 – Wien

«Laparoscopic resection of complicated urachal remnants: the new standard?»
N. A. Forster, Th. Köstler

10th Worlds Congress of IFSO 2005 – Maastricht (Niederlande)

Primary laparoscopic adjustuble gastric Banding versus revisional bariatric surgery to laparoscopic Roux-en –y gastric Bypass: A single centre comparative Study of 139 Patients
Th. Köstler, R. Küster, O. Schöb

122. Kongress der deutschen Gesellschaft für Chirurgie 2005

Die laparoskopische Choledochoenterostomie
Th. Köstler, O. Schöb

9th Annual Meeting of European Society of Surgery 2005 – Wien

Laparascopic biliodigestive Anastomosis
Th. Köstler, O. Schöb

Speeches and contributions at national conferences

Adipositas-Symposium Spital Limmattal 2015

Bariatrische Chirurgie:
15 Jahre Erfahrung und über 1000 Operationen am Spital Limmattal: Eine Bilanz
Th. Köstler

SGC 2013

Primary non-closure of mesenteric defects during laparoscopic RYG Bypass Reoperations and intraoperative findings in 116 patients
T. Delko, Th. Köstler, U. Zingg

Results of a patients-tailored approach of revisional surgery for insufficient weight loss after RYG Bypass
T. Delko, Th. Köstler

Results of laparoscopic Sleeve Gastrecotmy in 103 patients
T. Delko, Th. Köstler

Revisional versus primary laparoscopic very very long limb gastric bypass-a case matched analysis
T. Delko, Th. Köstler, U. Zingg

SGC 2012

Midterm results of the very, very long limb Roux-en-Y gastric bypass with and without additional fundus resection
T. Delko, Th. Köstler

SGC 2010

VVLL-Magenbypass mit oder ohne zusätzliche Magenfundusresektion: vergleichende Studie mit postoperativem Gewichtsverlauf nach 12 Monaten
T. Delko, Th. Köstler

Surgical treatment of posterior clavicle dislocation in sternoclavicular joint via ThightRope fixation system
R. Fakin, Th. Köstler

Der VVLL-Magenbypass (Very Very Long Limb): Kurz- und Langzeitresultate nach 0,5 – 9 Jahren
T. Delko, Th. Köstler, O. Schöb

SMOB Tagung Thun 2009

Distaler Magenbypass in der Behandlung des metabolischen Syndrom.
T. Delko, Th. Köstler

SGC 2009

A rare complication following laparoscopic Roux-en-Y gastric bypass: a case of acute mesenteric and portal venous thrombosis
F. C. Grafen, Th. Köstler

PFNA-Klingenwechsel mit Verbundosteosynthese als Therapieoption beim Cut-Out der PFNA-Schenkelhalsklinge
M. Randazzo, Th. Köstler

Laparoskopische Konversion des Magenbypass in eine biliopankreatische Diversion bei Gewichtsrebound
M. K. Jung, Th. Köstler

Chirurgische Fortbildung Alte Börse in Zürich

Turbo Chirurgie in der Bariatrie Kürzer – ambulant-besser?
Th. Köstler

SGC 2008

Innere Hernien nach laparoskopischem Magenbypass
R. Fahrner, Th. Köstler

Laparoscopic cholecystectomy as a standardized teaching operation: a comparison of operative complications and short-term outcome between surgical residents and attending surgeons in 1220 patients
R. Fahrner, M. Turina, V. Neuhaus, T. Köstler, O. Schöb

SGC 2007

Pertrochantere Femurfrakturen: Welches Implantat soll man benutzen: Gammanagel, PFN oder PFN-A? Erste Resultate einer vergleichenden Kohortenstudie
Zaccharia, Th. Köstler

Die winkelstabile volare Plattenosteosynthese der distalen Radiusfraktur: Korreliert das Röntgenbild mit dem funktionellen Outcome?
M.K. Jung, Th. Köstler

SGC 2004

Operative Therapie der Divertikelerkrankung – wann ist heute die offene Resektion noch notwendig?
S. Dätwiler, Th. Köstler, O. Schöb

In the media