Patent ID: 11857303
Assignee: PODIMETRICS, INC.
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 19:
20. An apparatus for measuring blood flow in a foot, the apparatus comprising:
a platform having a platform contact surface configured to receive the foot, the platform contact surface configured to receive a foot force having a foot force magnitude when the platform contact surface receives the foot;
a first PPG set having a first light source configured to emit light at a first wavelength, the first PPG set also having a first light detector, the first PPG set normally extending above the platform contact surface;
a second PPG set having a second light source configured to emit light at a second wavelength, the second PPG set also having a first light detector, the first wavelength and the second wavelength being different, the second PPG set normally extending above the platform contact surface;
a first spring coupled with the first PPG set, the first spring movably coupling the first PPG set with the platform, the first spring biased to produce a first biasing force via the first PPG set when the platform contact surface receives the foot;
a second spring coupled with the second PPG set, the second spring movably coupling the second PPG set with the platform, the second spring biased to produce a second biasing force via the second PPG set when the platform contact surface receives the foot,
the platform contact surface forming a first aperture at least in part containing the first PPG set and the first spring, the platform contact surface forming a second aperture at least in part containing the second PPG set and the second spring, the first PPG set configured to move within and at least in part outside of the first aperture, the second PPG set configured to move within the second aperture and at least in part outside of the second aperture,
the first PPG set and the first spring configured so that the first biasing force has a magnitude substantially independent of the foot force magnitude.