Delivering advanced chiropractic technology and global clinical support.
Sigma Instruments is a medical technology company specializing in advanced computerized assessment and treatment systems for musculoskeletal care. Based in Pittsburgh, Pennsylvania, the company designs and manufactures patented instrument-based technologies used by healthcare professionals around the world.
Sigma's flagship systems combine precise sensors, computer-guided analysis, and controlled percussive impulses to help clinicians evaluate joint motion and deliver targeted low-force treatments.
Used in clinics across more than twenty countries, Sigma's technology supports objective analysis and enables practitioners to deliver consistent, data-guided care for patients experiencing spinal and musculoskeletal dysfunction.
For over 30 years, Sigma Instruments has manufactured leading chiropractic medical devices, enabling doctors and patients with advanced technology and world-class services.
Mr. John Crunick is the founder of Sigma Instruments, Inc. and an industry leader in computerized low-energy resonance technology. Under his guidance, Sigma has expanded its global reach and developed groundbreaking medical devices such as the rRSW and rFAP, helping treat millions of patients each year with a strong safety record.
A driving force in research and development, product innovation, and global expansion, John has helped position Sigma as a leader in non-invasive physical medicine. His decades of executive management and engineering experience have enabled Sigma to transform healthcare with advanced technologies.
Since the 2022 acquisition by KD Yamasaki, John has played a key role in aligning Sigma's technologies with KD Yamasaki's vision and supporting next-generation therapeutic systems that combine AI with precision diagnostics. His leadership continues to shape the future of healthcare innovation.
We proudly manufacture world-class chiropractic medical devices with cutting-edge research and development.
Sigma provides global chiropractic education and training programs for healthcare professionals.
Our strategic marketing platform helps chiropractors grow their practice and patient outreach.
Sigma Instruments technology is trusted by practitioners worldwide, serving clinics across more than 20 countries with advanced computer-guided spinal treatment systems.