Fiber optic intravascular blood pressure transducer
First Claim
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1. A device for the measurement of the blood pressure of a patient which comprises:
- (a) means for producing a light for transmission through an optical fiber;
(b) means for receiving and measuring the light reflected through an optical fiber;
(c) a fiber holder;
(d) a first optical fiber for the transmission of the produced light having a distal end arranged longitudinally in said fiber holder and a proximal end connected to the means for producing a light;
(e) a second optical fiber for the transmission of the reflected light having a distal end arranged longitudinally in said fiber holder and a proximal end connected to the means for receiving and measuring a reflected light;
(f) a pressure sensing mechanism connected to said fiber holder comprising a cylindrically shaped outer shell having a side window; and
a thin plate having two sections including a reflector section arranged at an angle of approximately 90°
to the other section, said other section being movably situated within said window and one end of the reflector section being attached to the outer shell opposite to said window, said reflector section of said plate being located a predetermined nominal distance from and perpendicular to the distal end of said optical fibers such that the reflector section reflects light emitted from the first optical fiber into the second optical fiber in dependence of a variation in distance between the reflector setion and the distal ends of said optical fibers; and
(g) a membrane surrounding said shell to seal the pressure sensing mechanism blood and to permit the transmission of the blood pressure to the plate.
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Abstract
A device for the measurement of the blood pressure of a patient includes an arrangement for transmitting a light through an optical fiber; an arrangement for receiving and measuring a reflected light through an optical fiber; and a cylindrically shaped pressure sensor having a side window and a plate having two sections which moves in accordance with the applied blood pressure thereby causing the reflection and detection of different amounts of light based on the applied blood pressure at the window.
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Citations
20 Claims
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1. A device for the measurement of the blood pressure of a patient which comprises:
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(a) means for producing a light for transmission through an optical fiber; (b) means for receiving and measuring the light reflected through an optical fiber; (c) a fiber holder; (d) a first optical fiber for the transmission of the produced light having a distal end arranged longitudinally in said fiber holder and a proximal end connected to the means for producing a light; (e) a second optical fiber for the transmission of the reflected light having a distal end arranged longitudinally in said fiber holder and a proximal end connected to the means for receiving and measuring a reflected light; (f) a pressure sensing mechanism connected to said fiber holder comprising a cylindrically shaped outer shell having a side window; and
a thin plate having two sections including a reflector section arranged at an angle of approximately 90°
to the other section, said other section being movably situated within said window and one end of the reflector section being attached to the outer shell opposite to said window, said reflector section of said plate being located a predetermined nominal distance from and perpendicular to the distal end of said optical fibers such that the reflector section reflects light emitted from the first optical fiber into the second optical fiber in dependence of a variation in distance between the reflector setion and the distal ends of said optical fibers; and(g) a membrane surrounding said shell to seal the pressure sensing mechanism blood and to permit the transmission of the blood pressure to the plate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A device for the measurement of the blood pressure of a patient which comprises:
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(a) means for producing a light for transmission through an optical fiber; (b) means for receiving and measuring the light reflected through an optical fiber; (c) a fiber holder having a proximal end; (d) a catheter connected to the proximal end of the fiber holder; (e) a first optical fiber, disposed in the catheter, for transmission of the produced light and having a distal end arranged longitudinally in the fiber holder and a proximal end connected to the means for producing a light; (f) a second optical fiber, disposed in the catheter, for the transmission of the reflected light and having a distal end arranged longitudinally in the fiber holder and a proximal end connected to the means for receiving and measuring a reflected light; (g) a pressure sensing mechanism connected to said fiber holder comprising a cylindrically shaped outer shell having an exterior surface, a distal tip, and a side window; and
a thin plate having tow sections including a reflector section arranged at an angle of slightly larger than 90°
to the other section, said other section being movably situated within said window and one end of the reflector section being attached to the outer shell opposite to said window, said reflector section being located a predetermined nominal distance from and perpendicular to the distal ends of said optical fibers such that the reflector section reflects light emitted from the first optical fiber into the second optical fiber in dependence of a variation in distance between the reflector section and the distal ends of said optical fibers;(h) a membrane surrounding said shell to seal the pressure sensing mechanism and to permit the transmission of the blood pressure to the plate; and (i) a plastic coating situated over the exterior surface of the shell leaving the side window of said shell exposed. - View Dependent Claims (18, 19, 20)
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Specification