Implantable pressure sensor

Details Implantable pressure sensor Implantable pressure sensor

1974-12-02

1976-05-25

Howell, Kyle L.

Surgery

Truss

Perineal

128 205E, 128DIG21, A61B 500

Patent

active

039585620

ABSTRACT:
In the implantable pressure sensor disclosed herein, a radio-opaque liquid is contained within a resiliently compressible vessel of a silicone rubber, the volume of liquid actually contained within the vessel being then variable as a function of the pressure or force applied to the vessel. The silicone rubber is rendered impervious to the radio-opaque liquid by a treatment which involves expandng and saturating the cured silicone rubber with a mixture of a hydrocarbon solvent such as heptane containing a dissolved wax such as beeswax. The solvent expands and saturates the silicone rubber, carrying beeswax into the silicone rubber. When the solvent evaporates, the beeswax is then trapped within the interstices of the silicone rubber, under tension.

REFERENCES:
patent: 2528847 (1950-11-01), Van Norden
patent: 3111125 (1963-11-01), Schulte
patent: 3310051 (1967-03-01), Schulte
patent: 3625100 (1971-12-01), Summers
patent: 3669094 (1972-06-01), Heyer
patent: 3750194 (1973-08-01), Summers
patent: 3765414 (1973-10-01), Arlen

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