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US5336244A
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Temperature sensor based capture detection for a pacer
Assignee: REED A DUTHLER ESQ
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Filing: 1992-10-07
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Granted: 1994-08-09
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Expires: 2012-10-07
Abstract
Abstract A pacemaker system which includes a fast responding temperature sensor located near the distal end of a transvenous pacing lead generates a cycle-by-cycle variation of temperature indicative of the mechanical pumping action of the heart. A timer is used to define a detection window after the generation of a pacing pulse. The occurrence of a detected depolarization within the detection window indicates that the pacing pulses capture the heart.
Inventors
- 👤 Koen J. Weijand
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:40
CPC Classifications
A; A61; A61N; A61N1/00; A61N1/18; A61N1/32; A61N1/36; A61N1/362; A61N1/365; A61N1/36514; A61N1/3655; A61N1/37; A61N1/371; A61N1/3712
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
134 words
An apparatus implanted within a patient for detecting an evoked response of cardiac tissue evoked by a pacing pulse, comprising: pulse generator means for generating pacing pulses; means for applying said pacing pulses to a heart; sensing means for measuring blood temperature of said patient and for generating an electrical signal representative of said temperature; monitoring means coupled to said sensing means for monitoring said electrical signal provided from said sensing means to detect an occurrence of a cardiac evoked response; capture detect timer means for defining a capture detect window after the generation of a pacing pulse by said pulse generator means; and capture detect logic means responsive to said monitoring means and said capture detect timer means for detecting the occurrence of a said evoked response occurring within said capture detect window.
Claim 2
Independent Claim
134 words
An apparatus implanted within a patient for detecting an evoked response of cardiac tissue evoked by a pacing pulse, comprising: pulse generator means for generating pacing pulses; means for applying said pacing pulses to a heart; sensing means for measuring blood temperature of said patient and for generating an electrical signal representative of said temperature; monitoring means coupled to said sensing means for monitoring said electrical signal provided from said sensing means to detect an occurrence of a cardiac evoked response; capture detect timer means for defining a capture detect window after the generation of a pacing pulse by said pulse generator means; and capture detect logic means responsive to said monitoring means and said capture detect timer means for detecting the occurrence of a said evoked response occurring within said capture detect window.
Claim 3
Dependent Claim
49 words
The apparatus of claim 1 wherein said capture detect timer means comprises: a first timer means for defining a first time interval following the generation of said pacing pulse; and a second timer means for defining a capture detect window beginning with the expiration of said first time interval.
Claim 4
Dependent Claim
24 words
The apparatus of claim 2 wherein said first timer means comprises means for defining a first time interval of between 10 and 50 milliseconds.
Claim 5
Dependent Claim
24 words
The apparatus of claim 2 wherein said second timer means comprises means for defining a capture detect window of between 100 and 300 milliseconds.
Claim 6
Dependent Claim
51 words
The apparatus of claim 1 further comprising auto threshold logic means coupled to said pulse generator means and responsive to said capture detect logic means for altering energy content of said pacing pulses in response to an occurrence or non-occurrence of a detected cardiac evoked response within said capture detect window.
Claim 7
Dependent Claim
37 words
The apparatus of claim 5 wherein said auto threshold logic means comprises means for incrementing energy content of said pacing pulses in response to the non-occurrence of a detected cardiac evoked response within said capture detect window.
Claim 8
Dependent Claim
34 words
The apparatus of claim 1 or claim 2 or claim 3 or claim 4 or claim 5 or claim 6 wherein said sensing means comprises means for measuring blood temperature within said patient's heart.
Claim 9
Independent Claim
84 words
A method of detecting an evoked response of a patient's cardiac tissue evoked by a pacing pulse, comprising: generating pacing pulses; applying said pacing pulses to said patient's heart; measuring blood temperature of said patient and generating an electrical signal representative of said temperature; monitoring said electrical signal to detect the occurrence of a cardiac evoked response; defining a capture detect window after the generation of a pacing pulse; and detecting an occurrence of a said evoked response occurring within said capture detect window.
Claim 10
Independent Claim
84 words
A method of detecting an evoked response of a patient's cardiac tissue evoked by a pacing pulse, comprising: generating pacing pulses; applying said pacing pulses to said patient's heart; measuring blood temperature of said patient and generating an electrical signal representative of said temperature; monitoring said electrical signal to detect the occurrence of a cardiac evoked response; defining a capture detect window after the generation of a pacing pulse; and detecting an occurrence of a said evoked response occurring within said capture detect window.
Claim 11
Dependent Claim
42 words
The method of claim 8 wherein said step of defining a capture detect window comprises: defining a first time interval following the generation of said pacing pulse; and defining a capture detect window beginning with the expiration of said first time interval.
Claim 12
Dependent Claim
26 words
The method of claim 9 wherein said step of defining said first time interval comprises defining a first time interval of between 10 and 50 milliseconds.
Claim 13
Dependent Claim
26 words
The apparatus of claim 9 wherein said step of defining said capture detect window comprises defining a capture detect window of between 100 and 300 milliseconds.
Claim 14
Dependent Claim
32 words
The method of claim 8 further comprising altering energy content of said pacing pulses in response to an occurrence or non-occurrence of a detected cardiac evoked response within said capture detect window.
Claim 15
Dependent Claim
33 words
The method of claim 12 wherein said altering step comprises incrementing energy content of said pacing pulses in response to the non-occurrence of a detected cardiac evoked response within said capture detect window.
Claim 16
Dependent Claim
31 words
The method of claim 8 or claim 9 or claim 10 or claim 11 or claim 12 or claim 13 wherein said measuring step comprises measuring blood temperature within said patient'heart.
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