Patent US4649931A successfully refreshed from Google Patents.
US4649931A
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Sampled data sense amplifier
Assignee: Medtronic Inc
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Filing: 1981-03-02
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Granted: 1987-03-17
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Expires: 2001-03-02
Abstract
Abstract A sense amplifier for a cardiac pacemaker which has an amplifier section with two feedback paths. One path contains small valued capacitors and clock activated switches to form a discrete time feedback path. The other path contains unclocked passive components to form a continuous time feedback path. The sense amplifier generates a detect signal in response to a depolarization of cardiac tissue.
Inventors
- 👤 Robert C. Beck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 01:17
CPC Classifications
A; A61; A61N; A61N1/00; A61N1/18; A61N1/32; A61N1/36; A61N1/362; A61N1/37; A61N1/3702; A61N1/3704; Y; Y10; Y10S; Y10S128/00; Y10S128/902
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
85 words
A sampled data sense amplifier for producing a QRS detect signal in response to R-wave signals generated by the heart comprising: an analog processor having an input and an output; coupling means for coupling R-waves to said input; a first continuous time feedback network connected between said input and said output; a second discrete time feedback network connected between said input and said output; and, a level detector coupled to said output for generating a QRS detect signal when an R-wave exceeds a predetermined level.
Claim 2
Dependent Claim
85 words
A sampled data sense amplifier for producing a QRS detect signal in response to R-wave signals generated by the heart comprising: an analog processor having an input and an output; coupling means for coupling R-waves to said input; a first continuous time feedback network connected between said input and said output; a second discrete time feedback network connected between said input and said output; and, a level detector coupled to said output for generating a QRS detect signal when an R-wave exceeds a predetermined level.
Claim 3
Dependent Claim
32 words
The device of claim 1 further comprising a continuous time prefilter for low pass filtering of said R-wave signals coupled between said R-wave coupling means and said input to said analog processor.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-03-16 | 1990-09-15 | 1991-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-16 | 1994-09-15 | 1995-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-16 | 1998-09-15 | 1999-03-17 | $7700.00 | Window Closed / Lapsed |