Acoustic physiological sensor
First Claim
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1. An apparatus comprising:
- a physiological sensor including a biocompatible body sized and shaped to be implanted within a subject to contact tissue, at least a portion of the body including a material having at least one physical property that changes in response to a physiological condition predictive or indicative of a tachyarrhythmia when that portion of the body is implanted in contact with the tissue, wherein the change in the at least one physical property occurs because of the contact between that portion and the tissue, wherein the portion of the body is sized and shaped such that the change in the physical property is detectable using acoustic energy to provide an indication of the physiological condition.
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Abstract
This document describes, among other things, a body having at least one acoustically detectable property that changes in response to a change in a physiological condition, such as ischemia. The body is positioned with respect to a desired tissue region. At least one acoustic transducer is used to acoustically detect a change in physical property. In one example, the body is pH sensitive and/or ion selective. A shape or dimension of the body changes in response to pH and/or ionic concentration changes resulting from a change in an ischemia state. An indication of the physiological condition is provided to a user.
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Citations
20 Claims
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1. An apparatus comprising:
a physiological sensor including a biocompatible body sized and shaped to be implanted within a subject to contact tissue, at least a portion of the body including a material having at least one physical property that changes in response to a physiological condition predictive or indicative of a tachyarrhythmia when that portion of the body is implanted in contact with the tissue, wherein the change in the at least one physical property occurs because of the contact between that portion and the tissue, wherein the portion of the body is sized and shaped such that the change in the physical property is detectable using acoustic energy to provide an indication of the physiological condition. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method comprising:
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introducing a physiological sensor including a biocompatible body into contact with a tissue, wherein the body includes at least one physical property that changes as a result of the contact with the tissue in response to a physiological change associated with the tissue, the physiological change predictive or indicative of a tachyarrhythmia; transmitting acoustic energy to the body and the tissue; receiving transmitted acoustic energy for detecting the change in the physical property of the body; and detecting and providing an indication of the physiological change by detecting the change in the physical property of the body. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. An apparatus comprising:
a physiological sensor including a biocompatible body, the body sized and shaped to be implanted within a subject to contact tissue, at least a portion of the body including a material having at least one physical property that changes in response to a physiological condition of the tissue when that portion of the body is implanted in contact with the tissue, the change in the physiological condition being predictive or indicative of ischemia, wherein the change in the at least one physical property occurs because of the contact between that portion and the tissue, wherein the portion of the body is sized and shaped such that the change in the physical property is detectable using acoustic energy to provide an indication of the physiological condition. - View Dependent Claims (17, 18, 19, 20)
Specification