Optical pressure sensor for measuring blood pressure

Details Optical pressure sensor for measuring blood pressure Optical pressure sensor for measuring blood pressure

1986-03-10

1987-09-08

Howell, Kyle L.

Surgery

Truss

Pad

128675, 128748, 73705, A61B 502

Patent

active

046917080

ABSTRACT:
The optical blood pressure catheter includes an elongated optical fiber located within the lumen of the catheter for transmitting light received at its proximal end to its distal end where the light is reflected from a mirror and the reflected light is received at the distal end and transmitted back to the proximal end thereof. A pressure transducer is located at the distal end of the catheter and includes a mirror which is spaced forwardly of the distal end of the optical fiber and is fixed in position relative thereto so as to receive and reflect light emitted from the distal end of the optical fiber and back into the distal end thereof. A side port is provided in the catheter housing adjacent its distal end and the side port is sealed with a pressure-responsive membrane responsive to pressure acting transversely thereof. The pressure-responsive memberane is coupled to the distal end of the optical fiber so that the distal end of the optical fiber is displaced in dependence upon pressure acting upon the membrane. The catheter is vented to atmospheric pressure permitting pressure readings greater or less than that of atmospheric pressure.

REFERENCES:
patent: 3215135 (1965-11-01), Franke
patent: 3267932 (1966-08-01), Valliere
patent: 3789667 (1974-02-01), Porter et al.
patent: 4210029 (1980-07-01), Porter
patent: 4487206 (1984-12-01), Aagard
patent: 4543961 (1985-10-01), Brown
patent: 4548505 (1985-10-01), Ono
patent: 4593701 (1986-06-01), Kobayashi et al.
patent: 4611600 (1986-09-01), Cohen
Matsumoto et al., "The Development of a Fibre Optic Catheter Tip Pressure Transducer", J. of Med. Engr. and Technology, vol. 2, No. 5.

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