System for detection of blood pressure using a pressure sensing guide wire
First Claim
Patent Images
1. A system for detection of blood pressure in a blood vessel comprising:
- a guide wire;
a sensor circuit provided at least in part at a distal end of said guide wire, said sensor circuit including a capacitor and a coil disposed at said distal end of said guide wire, at least one of said coil and said capacitor being responsive to changes in pressure of fluid external to said guide wire;
a detector operatively connected to said sensor circuit for monitoring said sensor circuit and determining the pressure of the external fluid; and
an insertion sheath, said guide wire extending through said insertion sheath, said sensor circuit being operatively connected to said detector via a ground electrode at a distal end of said guide wire and via a brush contact inside said insertion sheath.
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Accused Products
Abstract
A guide wire has a distal end incorporating a coil and a capacitive element that form a resonance circuit with a resonance frequency that is responsive to the pressure of blood external to the guide wire. The resonance frequency can be detected wirelessly, or through two contacts at the proximal wire end, or through one brush contact located inside an insertion sheath and a ground electrode. Wireless detection can be implemented via a second resonance circuit, and electronics for determining the frequency when the first and second circuits are in resonance with each other.
15 Citations
16 Claims
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1. A system for detection of blood pressure in a blood vessel comprising:
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a guide wire; a sensor circuit provided at least in part at a distal end of said guide wire, said sensor circuit including a capacitor and a coil disposed at said distal end of said guide wire, at least one of said coil and said capacitor being responsive to changes in pressure of fluid external to said guide wire; a detector operatively connected to said sensor circuit for monitoring said sensor circuit and determining the pressure of the external fluid; and an insertion sheath, said guide wire extending through said insertion sheath, said sensor circuit being operatively connected to said detector via a ground electrode at a distal end of said guide wire and via a brush contact inside said insertion sheath. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A system for detection of blood pressure in a blood vessel comprising:
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a guide wire; a sensor circuit provided at least in part at a distal end of said guide wire, said sensor circuit including a capacitor and a coil disposed at said distal end of said guide wire, at least one of said coil and said capacitor being responsive to changes in pressure of fluid external to said guide wire; and a detector operatively connected to said sensor circuit for monitoring said sensor circuit and determining the pressure of the external fluid, wherein said guide wire has a core member and a hypotube, said detector being connected to said sensor circuit via two electrical contacts located at a proximal end of said guide wire, one of said electrical contacts being connected to said core member and another of said electrical contacts being connected to said hypotube.
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16. A system for detection of blood pressure in a blood vessel comprising:
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a guide wire; a sensor circuit provided at least in part at a distal end of said guide wire, said sensor circuit including a capacitor and a coil disposed at said distal end of said guide wire, at least one of said coil and said capacitor being responsive to changes in pressure of fluid external to said guide wire; a detector operatively connected to said sensor circuit for monitoring said sensor circuit and determining the pressure of the external fluid; and an insertion sheath, said guide wire extending through said insertion sheath, a metal layer or a braid being disposed inside the sheath, said metal layer or braid coacting together with said guide wire to form a capacitor that couples said detector to said sensor circuit.
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Specification