US4273114A
Expired / Lapsed
US
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Cardiopulmonary resuscitator, defibrillator and monitor
Assignee: Michigan Instruments Inc
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Filing: 1979-11-23
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Granted: 1981-06-16
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Expires: 1999-11-23
Abstract
Abstract A reciprocal cardiac compressor is provided for cyclically compressing a patient's chest. Preferably a resuscitator is also provided for ventilating the patient's lungs. The compressor includes a reciprocal compressor pad positioned anterior to the patient's heart and a stationary base positioned posterior to the patient's heart. An anterior electrode is disposed on the face of the compressor pad for compression between the compressor pad and the patient's sternum and a posterior electrode is disposed on the base of the compressor for compression between the base and the patient's back. A cardiac defibrillator is connected between anterior and posterior electrodes for establishing a defibrillating electric current therebetween. A monitor is connected to the anterior and posterior electrodes for monitoring the electrical activity of the patient's heart. Means for snychronizing the defibrillator and the compressor is provided comprising a pressure sensitive switch for synchronizing the defibrillator and compressor such that defibrillating current is applied to the patient's heart only during a systolic portion of the compression cycle of the compressor.
Inventors
- 👤 Clare E. Barkalow
- 👤 James O. Elam
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:41
CPC Classifications
A; A61; A61H; A61H31/00; A61H31/004; A61H31/005; A61H31/006; A61H31/008; A61N; A61N1/00; A61N1/18; A61N1/32; A61N1/38; A61N1/39; A61N1/3904; A61N1/39044; A61H2201/00; A61H2201/10; A61H2230/00; A61H2230/04; A61M; A61M16/00; A61M16/021
Claims Analysis
Total Claims: 31
Claim 1
Independent Claim
152 words
A cardiac compressor and defibrillator comprising in combination: a reciprocatable cardiac compressor means for cyclically compressing a patient's chest; said compressor means including a base for positioning behind the patient's back posterior to the patient's heart; said compressor means including a cardiac compressor pad for positioning anterior to the patient's heart, said compressor pad being actuated by said compressor means for compressing the patient's heart between said compressor pad and said base; an anterior electrode disposed on said compressor pad for compression between said compressor pad and the patient's sternum; a posterior electrode disposed on said base for compression between said base and the patient's back; a cardiac defibrillator means connected to said anterior and posterior electrodes for establishing an electric current therebetween; and a means for synchronizing said defibrillator means and said compressor means whereby a defibrillating current is applied to the patient's heart only during compression of a patient's heart.
Claim 2
Dependent Claim
152 words
A cardiac compressor and defibrillator comprising in combination: a reciprocatable cardiac compressor means for cyclically compressing a patient's chest; said compressor means including a base for positioning behind the patient's back posterior to the patient's heart; said compressor means including a cardiac compressor pad for positioning anterior to the patient's heart, said compressor pad being actuated by said compressor means for compressing the patient's heart between said compressor pad and said base; an anterior electrode disposed on said compressor pad for compression between said compressor pad and the patient's sternum; a posterior electrode disposed on said base for compression between said base and the patient's back; a cardiac defibrillator means connected to said anterior and posterior electrodes for establishing an electric current therebetween; and a means for synchronizing said defibrillator means and said compressor means whereby a defibrillating current is applied to the patient's heart only during compression of a patient's heart.
Claim 3
Dependent Claim
14 words
The cardiac compressor of claim 1 further including means for ventilating the patient's lungs.
Claim 4
Dependent Claim
23 words
The cardiac compressor of claim 1 wherein said compressor means and said means for ventilating the patient's lungs are pneumatically driven and controlled.
Claim 5
Dependent Claim
18 words
The cardiac compressor of claim 1 further including means for monitoring the electrical activity of the patient's heart.
Claim 6
Dependent Claim
36 words
The cardiac compressor of claim 1 wherein said means for synchronizing comprises means for sensing pressure applied to the patient's chest by said compressor means and disabling said defibrillator means until a predetermined pressure is reached.
Claim 7
Dependent Claim
28 words
The cardiac compressor of claim 5 wherein said means for sensing pressure comprises a pressure sensitive switch for disabling said defibrillator means until a predetermined pressure is reached.
Claim 8
Dependent Claim
47 words
The cardiac compressor of claim 6 wherein said defibrillator means is triggered by a manually activated switch said pressure sensitive switch being normally open and connected in series with said manually activated switch to prevent the application of a defibrillating current until a predetermined pressure is reached.
Claim 9
Dependent Claim
29 words
The cardiac compressor of claim 6 wherein said compressor means includes a power cylinder and piston; and said pressure sensitive switch is responsive to pressure in said power cylinder.
Claim 10
Dependent Claim
36 words
The cardiac compressor of claim 1 wherein said means for synchronizing comprises means for sensing the initiation of systole and a time delay relay for disabling said defibrillator means until a predetermined time period has passed.
Claim 11
Dependent Claim
26 words
The cardiac compressor of claim 1 wherein said compressor pad is pivotally mounted on said compressor means for accommodating patients with sternums having various angular orientations.
Claim 12
Dependent Claim
44 words
The cardiac compressor of claim 1 wherein said compressor pad is provided with a face in contact with the patient's chest, said face having an area several times greater than the normal heel of hand area applied to the patient's chest during manual CPR.
Claim 13
Dependent Claim
22 words
The cardiac compressor of claim 1 wherein said compressor pad comprises an elastomeric body having a face conformable to the patient's chest.
Claim 14
Dependent Claim
24 words
The cardiac compressor of claim 12 wherein said anterior electrode comprises a planar flexible metalized electrode secured to said face of said compressor pad.
Claim 15
Dependent Claim
24 words
The cardiac compressor of claim 13 wherein said anterior electrode presents a contact area of 5 square inches or more with the patient's chest.
Claim 16
Dependent Claim
58 words
The cardiac compressor of claim 1 wherein said compressor pad comprises: a support connected to said compressor means; a body of semi-flexible elastomer mounted on said support; a face molded into said body, said face being molded to conform to a typical human chest, said body of semi-flexible elastomer accommodating variations in the size of each patient's chest.
Claim 17
Dependent Claim
24 words
The cardiac compressor of claim 15 wherein said anterior electrode comprises a mesh screen metal electrode vulcanized to said face of said compressor pad.
Claim 18
Dependent Claim
13 words
The cardiac compressor of claim 16 wherein a silver mesh screen is provided.
Claim 19
Dependent Claim
14 words
The cardiac compressor of claim 16 wherein a gold plated mesh screen is provided.
Claim 20
Dependent Claim
28 words
The cardiac compressor of claim 15 further including: an electrical terminal disposed on said support; and a plurality of flexible leads interconnecting said terminal and said anterior electrode.
Claim 21
Dependent Claim
19 words
The cardiac compressor of claim 19 wherein said flexible leads run internally in the body of said compressor pad.
Claim 22
Dependent Claim
19 words
The cardiac compressor of claim 15 wherein said support comprises a planar metal backing member for supporting said body.
Claim 23
Dependent Claim
25 words
The cardiac compressor of claim 21 wherein said planar metal backing member includes a hinge structure for pinning said compressor pad to said compressor means.
Claim 24
Dependent Claim
26 words
The cardiac compressor of claim 1 wherein said anterior electrode is integrally formed with said compressor pad said compressor pad being formed of a conductive material.
Claim 25
Dependent Claim
23 words
The cardiac compressor of claim 1 wherein said posterior electrode comprises a mesh screen metal electrode secured to the face of said base.
Claim 26
Dependent Claim
13 words
The cardiac compressor of claim 24 wherein a silver mesh screen is provided.
Claim 27
Dependent Claim
14 words
The cardiac compressor of claim 24 wherein a gold plated mesh screen is provided.
Claim 28
Dependent Claim
24 words
The cardiac compressor of claim 1 wherein said posterior electrode presents a contact area of 10 square inches or more with the patient's back.
Claim 29
Dependent Claim
31 words
The cardiac compressor of claim 1 wherein said posterior electrode is integrally formed with said base and said posterior electrode is electrically insulated from the rest of the cardiac compressor unit.
Claim 30
Dependent Claim
191 words
A cardiopulmonary resuscitator and defibrillator comprising in combination: a reciprocatable cardiac compressor means for cyclically compressing a patient's chest; said compressor means including a base for positioning behind the patient's back posterior to the patient's heart; said compressor means including a cardiac compressor pad for positioning anterior to the patient's heart, said compressor pad being actuated by said compressor means for compressing the patient's heart; an anterior electrode disposed on said compressor pad for compression between said compressor pad and the patient's sternum; a posterior electrode disposed on said base for compression between said base and the patient's heart; a means for ventilating the patient's lungs; a cardiac defibrillator means connected to said anterior and posterior electrodes for establishing an electric potential therebetween; a pressure sensitive switch for sensing pressure applied to the patient's heart by said compressor means, said switch synchronizing said defibrillator means and said compressor means, whereby a defibrillating current is applied to the patient's heart only during a systolic portion of a compression cycle of said compressor means; and a means for monitoring the electrical activity of the patient's heart connected to said anterior and posterior electrodes.
Claim 31
Dependent Claim
191 words
A cardiopulmonary resuscitator and defibrillator comprising in combination: a reciprocatable cardiac compressor means for cyclically compressing a patient's chest; said compressor means including a base for positioning behind the patient's back posterior to the patient's heart; said compressor means including a cardiac compressor pad for positioning anterior to the patient's heart, said compressor pad being actuated by said compressor means for compressing the patient's heart; an anterior electrode disposed on said compressor pad for compression between said compressor pad and the patient's sternum; a posterior electrode disposed on said base for compression between said base and the patient's heart; a means for ventilating the patient's lungs; a cardiac defibrillator means connected to said anterior and posterior electrodes for establishing an electric potential therebetween; a pressure sensitive switch for sensing pressure applied to the patient's heart by said compressor means, said switch synchronizing said defibrillator means and said compressor means, whereby a defibrillating current is applied to the patient's heart only during a systolic portion of a compression cycle of said compressor means; and a means for monitoring the electrical activity of the patient's heart connected to said anterior and posterior electrodes.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-06-15 | 1984-12-15 | 1985-06-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-06-15 | 1988-12-15 | 1989-06-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-06-15 | 1992-12-15 | 1993-06-16 | $7700.00 | Window Closed / Lapsed |