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General surgery

Center for Surgical Services
105 Co. Rte. 45A
Suite 100
Oswego, NY
Phone: 315.342.6771

The Center for Surgical Services provides exceptional general surgery services in Oswego Hospital's technologically advanced surgery center. Complementing this seven-suite surgery center is its caring and professional team of physicians, nurses, anesthesiologists, and other clinical staff, who offer high-quality care.

The Center for Surgical Services offer experienced, caring surgeons who provide a complete range of general surgery services.

Areas of specialty include:

  • Breast Care
  • Colonoscopy
  • Endoscopy
  • Gallbladder
  • Thyroid
  • Colon Cancer Screening
  • Laparoscopic surgery including:
    • Appendectomy
    • Colon
    • Gallbladder
    • Gastrointestinal
    • Hernia


Lisa Lai, MD

Dr. Lisa Lai is a Fellowship-trained breast care surgeon, affiliated with Upstate Medical Center. She provides a complete range of care from screenings to evaluation of breast masses or other concerns, management of abnormal breast imaging, and surgery for benign or malignant disease and mastectomies.

Jeffrey Witt Strain, MD, FACS, FASMBS

Dr. Jeffrey Strain
is trained and board-certified in the areas of bariatric surgery, general surgery, and endocrine surgery with over a decade of experience in complex laparoscopy and minimally invasive surgery.

Before joining Oswego Health, Strain practiced in New Jersey where he trained and adopted robotic surgery to further enhance his procedures at both Englewood Health and Bergen Bariatric Laparoscopic Associates.

Dr. Strain earned his medical degree from Case Western Reserve University School of Medicine in Cleveland, OH in 1992 and his Bachelor of Arts with a major in Psychology and Biology from the University of Rochester in NY in 1987. Also, Strain completed an extensive post-graduate training program which consisted of a Laparoscopic Surgery Fellow – Colorectal Surgery at Mount Sinai Medical Center in 2001; a Registrar – Cardiothoracic Surgery at Sir Charles Gairdner Hospital in Perth, Australia in 2000; Senior Registrar – General Surgery at Royal Perth Hospital in Perth, Australia in 2000; Endocrine Surgery Fellow at Mount Hospital in Perth, Australia in 1998; Chief Resident – General Surgery at the University Hospitals of Cleveland in 1997; Resident – General Surgery at the University Hospitals of Cleveland in 1996.

Recognized by New Jersey Magazine as a “Top Doc”, in addition to performing surgery for the past twenty years, Strain holds an active professorship at the Third Xiangya Hospital in Changsha, Hunan Province, China; International Examiner for the Graduate School of Central South University; Assistant Clinical Professor in the Department of Surgery at Mount Sinai School of Medicine. He has completed fellowships for the American College of Surgeons and American Society of Metabolic and Bariatric Surgery; earned Bariatric Center of Excellence through Surgical Review Corporation; and ASMBS Center of Excellence through American Society of Metabolic and Bariatric Surgery.

Lastly, Strain holds active membership in the American College of Surgeons, American Society of Bariatric Surgeons, Society of Gastroenterological Surgeons, and American Medical Association.

Duane F. Tull, MD, MBA, FACS

Dr. Duane Tull has nearly 20 years of surgery experience and will be performing a range of services, including appendix, hernia, colon resections, and gall bladder surgeries, among others. Dr. Tull most recently served as chief of surgery at Geisinger Jersey Shore Hospital, Jersey Shore, Pennsylvania.

Dr. Tull earned his medical degree at Eastern Virginia Medical School. He completed his residency at the Christiana Care Health System. Headquartered in Wilmington, Delaware, Christiana Care is a not-for-profit teaching health system with more than 260 residents and fellows. The system is continually ranked by US News & World Report as a Best Hospital. In addition to providing surgical care, he served as a clinical assistant professor of surgery at Geisinger Commonwealth School of Medicine.

Ruth N Vasquez, MSN, FNP

Ruth N Vasquez, MSN, FNP provides care to our surgical patients. She is a graduate of SUNY Upstate Medical University and Cayuga Community College. She's proud to care for her hometown of Oswego and the surrounding community. Ruth is also a graduate of CiTi's New Vision Allied Health program.

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Dr. Ryan Walker’s professional interests include breast surgery, colorectal surgery, gallbladder surgery, and hernia repairs, with an emphasis on utilizing minimally invasive techniques. Dr. Walker is also a DaVinci-certified robotic surgeon.

Before joining Oswego Health, Dr. Walker practiced in the Albany area at both St. Peter’s Heath Partners and St. Mary’s Healthcare.

Dr. Walker graduated from Ithaca College before earning his medical degree at the American University of the Caribbean in 2007. Dr. Walker completed his post-graduate training along with his Chief Residency at York Hospital in Pennsylvania.

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