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Arthroscopically Implantable Force Probe

Arthroscopically Implantable Force Probe

Product catalog summary

Specifications:
- Excitation: 14 milliamps D.C.
- Sensitivity: 30 mV/ma/N
- Non-Linearity: +/- 1.5% over 1/2 FS, +/- 2.5% over FS
- Hysteresis: 0.3% FS
- Repeatability: 0.3% FS
- Temperature Coefficient: Offset +/- .013% FS/C deg., Span + .0125%/N/C deg.
- Full Scale (FS): 16 N (customizable)
- Length: 5 mm
- Cross Section: Elliptical, 1.4 mm by 1.8 mm
- Leads: Polyimide and copper tape cable, 20 cm long
- Transverse Stiffness: Approx. 1.5 N/micron
- Fatigue Life: Approx. 1 million cycles at 1/2 FS

Design and Materials:
The sensor is designed for medical research to measure forces in living tissues. It is made from micro-machined, heat-treated stainless steel, forming a tiny elliptical spring structure that deforms elastically under load. A thermally matched strain gauge bonded to the steel probe provides a sensitive, linear output proportional to applied force. The device is encapsulated with biocompatible parylene for protection against saline.

Applications:
The sensor is suitable for orthopedic research, tactile sensing, and feedback for electrical muscle stimulation. It is arthroscopically implantable and approximately the size of a No. 2 pencil point, designed for placement in tight areas.

Calibration and Measurement:
AIFP's are factory calibrated using transverse forces with a calibrated load cell (accuracy +/- 0.12 N) as a reference. Non-linearity is defined as the percentage deviation from a best-fit straight line over the calibrated range. Excitation and measurement are accomplished using Wheatstone bridge circuits and instrumentation amplifiers. Data can be read, displayed, and saved using MicroStrain's DataGauge software or StrainLink telemetry systems.

Limitations:
The device is constructed of biocompatible materials but is not FDA approved for implantation in live humans.

Contact Information:
MicroStrain, 294 North Winooski Avenue, Burlington, Vermont, USA. Phone: 800-449-DVRT (3878) or 802-862-6629. Fax: 802-863-4093. Email: [email protected]. URL: www.microstrain.com

Catalog excerpts

Arthroscopically Implantable Force Probe-1

Approximately the size of a No. 2 pencilpoint, the patented AIFP is designed for placement in very tight areas. Excitation 14 milliamps D.C. Full scale (FS) 16 N * Sensitivity 30 mV/ma/N Length 5 mm > section break Non-Linearity +/- 1.5% over 1/2 FS+/- 2.5% over FS Cross section elliptical1.4 mm by1.8 mm Hysteresis 0.3% FS Repeatability 0.3% FS Leads Polyimide andcopper tape cable,20 cm long Temp. Coeff. - Offset +/- .013% FS/C deg. - Span + .0125%/N/C deg. Transverse stiffness Approx. 1.5 N/micron > Full scale range may be tailored for specific applications. Fatigue life Approx. 1 million cyclesat 1/2 FS U.S. Patent Nos. 4,993,428 & 5,083,573 and Patents Pending >

Open the catalog to page 1

Arthroscopically Implantable Force Probe-2

AFP Nonlinearity: > AFP Calibration: for direct transverse loading > Probe output for direct transverse loading 3 > y = 1.7709e-2 + 0.20620x R^2 = 0.999 2 1 > Nonlinearity (%) -1 -2 > > 2 4 6 8 2 4 6 8 > Load Cell Output (N) Load Cell Output (N) >

Open the catalog to page 2

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*Prices are pre-tax. They exclude delivery charges and customs duties and do not include additional charges for installation or activation options. Prices are indicative only and may vary by country, with changes to the cost of raw materials and exchange rates.

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