AIFPs - Arthroscopically implantable force probes

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AIFP® - Arthroscopically Implantable Force Probe.

Smaller than a no. 2 pencil tip, this submergible micro-force transducer is ideal for medical research applications. The AIFP® is constructed from micro-machined stainless steel and heat treated to form an elliptical spring microstructure, which deforms elastically when loaded. This construction allows the device to accurately and reproduceably measure applied forces.

A quarter bridge strain gauge bonded to the structure provides a sensitive output, linearly proportional to force. The strain gauge's self temperature coefficient is matched to the stainless steel substrate to minimize the effect of temperature on probe output. The elliptical cross section and 3-conductor flat tape cable keep the device anchored and oriented within fibrous materials. In addition, bridge completion resistors are included in the AIFP's® integral connector.

For implantation, a trocar and slotted cannula are used to bury the transducer within the tissue substance. A suture may be placed in an aperture located in the wall of the probe to facilitate probe removal. The AIFP® is coated with high temperature polyimide and parylene coatings for protection against moisture and saline solutions.

Applications:

• Orthopaedic Research: soft tissue force measurement
• Ergonomics Studies: tactile sensing
• Virtual Reality: body suits