Technology Bundle ID: TAB-2758

Cylindrical Handle Dynamometer for Improved Grip-Strength Measurement

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Primary Inventors: 
Bryan Wimer (CDC)
Christopher Warren (CDC), Daniel Welcome (CDC), Renguang Dong (CDC), Thomas McDowell (CDC)
Development Stage: 
Development Status: 
  • In situ data available (on-site)
  • Prototype
Institute or Center: 

CDC researchers have developed an improved dynamometer device and method for measuring maximum hand grip force or grip-strength. Human test subjects were used in conducting experiments to evaluate the handle and to assess the measurement method. In contrast to the currently used "Jamar handle" grip strength dynamometer devices, the cylindrical handle proved to be able to determine the overall grip strength for a subject, as well as show the grip force distribution around the circumference of the handle. The cylindrical dynamometer handle is accurate with less than 4% error, and it demonstrates that the measurement is independent of the loading position along the handle. For real-world applications, the device can be used to help diagnose the musculoskeletal disorders of the hand, monitor the recovery progress after hand surgery or injury, and collect grip strength data for tool and machine design.

  • Useful for engineering functional design and ergonomic considerations for developing new tools and machinery
  • Monitoring post-operative, post-stroke rehabilitation
  • Diagnosis of carpel tunnel syndrome, musculoskeletal disorders and hand-arm vibration syndrome
  • Training feedback for grip-strength focused athletes - climbing, gymnastics, rugby, martial arts, etc.

Compared to currently used "Jamar" grip test devices:

  • Cylindrical handle shape more comparable with real-world/workplace machinery
  • Improved comfort
  • Cylindrical meter assesses the total grip force, together with the friction force and torque
  • Grip force distributed at the different parts of the hand can be measured with cylindrical meter - important information for the diagnosis of hand disorders


US Application 61/175,473
Filed on 2009-05-05
US Pat 8,240,202

Issued 2012-08-14


Wimer B, et al.
PMID 19250853


Feb 6, 2014

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