Calcula Technologies was founded in 2012 with a simple observation: The majority of patients with symptomatic kidney stones suffer through excruciating pain waiting for "spontaneous passage".  In fact, about 75% of the 2M patients a year in the United States do not receive an intervention. This watchful waiting results in 1% of all ER visits, 4M doctors visits, and all the well publicized issues of narcotics dependence as the patients wait to pass their stones. 

Calcula Technologies wants to change this paradigm.

Leadership Team

David Gal is Calcula's Chief Technology officer.  David brings 7 years of experience building advanced hardware/software systems to Calcula.  He earned his Bachelors in electrical engineering from Brown University and his Masters degree also in electrical engineering from Stanford University.


Buzz Bonneau is Calcula's Chief Executive Officer.  Buzz brings 12 years of experience in the medical device industry to Calcula.  He earned his bachelors and masters degrees from Stanford University in mechanical engineering and holds an MBA from the Hass School of Business.

Scientific Advisory Board


Calcula Technologies has a number of clinical advisors with a range of experience in private and academic settings. For a full list of advisors, please contact us directly. 

John Leppert, MD - Associate Professor of Urology Stanford University

John Leppert, MD MS is a urologist and epidemiologist at Stanford University. He earned his BA and MD from Northwestern University as part of the Honors Program in Medical Education and completed his urology residency at UCLA. He then completed a fellowship in endourology and minimally-invasive surgery, also at UCLA. Dr. Leppert joined the faculty at Stanford University 6 years ago and cares for patients with kidney stones and urologic cancers. He has published several papers on the risk factors for kidney stone
disease and the use of minimally-invasive approaches to treat kidney stones. 


Raj Shinghal, MD

Rajesh Shinghal MD is a clinical urologist at Palo Alto Medical Foundation with clinical interest in kidney stone disease and surgery.   He earned his BS from Stanford University, then continued on for his medical degree at Stanford and completed his urology residency at Stanford Medical Center.  For over 10 years, Dr. Shinghal served as the Associate Chief of Urology at Santa Clara Valley Medical Center and Clinical Assistant Professor at Stanford Medical Center, caring for patients with complex stone disease.  He has published several papers and presented numerous abstracts
in the area of kidney stone disease, including presentations on
novel surgical devices for stone management.

Dr. Shinghal has served as a scientific advisor to several urological
device companies and pharmaceutical companies as well.