EP0216042A1
Expired / Lapsed
EP
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Cardiac assist device
Assignee: Medtronic Inc
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Filing: 1986-07-10
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Granted: —
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Expires: 2006-07-10
Abstract
Abstract A muscle-powered pump to assist the natural heart is disclosed. The device comprises an oblate, spheroidal-shaped pumping chamber (20) surrounded by innervated muscular tissue (22). The device (10) may be coupled to the ventricle and descending aorta with valves (28,30) and be stimulated in synchrony with the natural depolarization of the heart or the device (12,14,16) may be inserted into the descending aorta and used as a counter pulsation device. In this application, the innervated muscle (22) is stimulated after a brief delay from the natural cardiac depolarization.
Inventors
- 👤 Aida S. Khalafalla
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 23:29
CPC Classifications
A; A61; A61N; A61N1/00; A61N1/18; A61N1/32; A61N1/36; A61N1/36042; A61M; A61M60/00; A61M60/80; A61M60/855; A61M60/871; A61M60/882; A61M60/10; A61M60/122; A61M60/126; A61M60/148; A61M60/165; A61M60/178; A61M60/40; A61M60/424; A61M60/89; A61M60/894; A61M2205/00; A61M2205/33; A61M2205/3303; A61M60/20; A61M60/247; A61M60/253; A61M60/268; A61M60/274
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
254 words
A cardiac assist device for pumping blood form the left ventricle to the aorta of a patient's heart in synchrony with the ventricular depolarization of the patient's heart comprising: • a first tubular shunt having a proximal and distal end for connection to said left ventricle of said heart through said proximal end; • a second tubular shunt having a proximal and distal end for connection to said aorta of said heart; , an elastic pumping chamber having an oblate ellipsoidal shape defined by a horizontal axis and a vertical axis adapted to be substantially completely surrounded by a sheath of innervated autogenous muscle tissue, and having first and second annular apertures located at the periphery of said chamber concentric with said horizontal axis; • a unidirectional aortic valve coupled to said distal end of said first tubular shunt and coupled to said first aperture; • a unidirectional mitral valve coupled to said distal end of second tubular shunt and coupled to said second aperture; • a pulse generator adapted to be coupled to a first and a second electrode for providing low amplitude continuous stimulation pulses at a low frequency rate and for providing high amplitude stimulation pulses in synchrony with the detected depolarization of said ventricle; * wherein said first electrode is adapted to be coupled to said autogenous muscle tissue for stimulation and adapted to be coupled to said pulse generator; and • wherein said second electrode is adapted to be coupled to said ventricle for sensing depolarizations of ventricular tissues.
Claim 2
Dependent Claim
254 words
A cardiac assist device for pumping blood form the left ventricle to the aorta of a patient's heart in synchrony with the ventricular depolarization of the patient's heart comprising: • a first tubular shunt having a proximal and distal end for connection to said left ventricle of said heart through said proximal end; • a second tubular shunt having a proximal and distal end for connection to said aorta of said heart; , an elastic pumping chamber having an oblate ellipsoidal shape defined by a horizontal axis and a vertical axis adapted to be substantially completely surrounded by a sheath of innervated autogenous muscle tissue, and having first and second annular apertures located at the periphery of said chamber concentric with said horizontal axis; • a unidirectional aortic valve coupled to said distal end of said first tubular shunt and coupled to said first aperture; • a unidirectional mitral valve coupled to said distal end of second tubular shunt and coupled to said second aperture; • a pulse generator adapted to be coupled to a first and a second electrode for providing low amplitude continuous stimulation pulses at a low frequency rate and for providing high amplitude stimulation pulses in synchrony with the detected depolarization of said ventricle; * wherein said first electrode is adapted to be coupled to said autogenous muscle tissue for stimulation and adapted to be coupled to said pulse generator; and • wherein said second electrode is adapted to be coupled to said ventricle for sensing depolarizations of ventricular tissues.
Claim 3
Dependent Claim
21 words
The device of claim 1 wherein said chamber has a volume between 100 and 200 ml and most preferably 140 ml.
Claim 4
Dependent Claim
23 words
The device of claim 1 or claim 2 wherein said first tubular shunt has an internal diameter between 1.5 cm and 2.5 cm.
Claim 5
Dependent Claim
23 words
The device of claim 1 or claim 2 wherein said second tubular shunt has an internal diameter between 1.1 cm and 2.1 cm.
Claim 6
Dependent Claim
24 words
The device of claim 1 or claim 2 wherein the length of the vertical minor axis (b) and horizontal axis (a) bear the relationship:
Claim 7
Dependent Claim
26 words
The device of claim 1 wherein the muscle mass, m, required to wrap said chamber is between 350 to 600 gm and most preferably 560 gm.
Claim 8
Dependent Claim
24 words
The device of claim 1 further including a battery-powered stimulator delivering square waves with programmable delay, frequency, pulse width, pulse train duration, and current.
Claim 9
Dependent Claim
27 words
The device of claim 7 wherein the stimulator has a pulse train duration which varies between 150 and 250 milliseconds with a preferred duration of 200 milliseconds.
Claim 10
Dependent Claim
23 words
The device of claim 7 wherein the stimulator pulse width varies between 200 and 300 microseconds with a preferred value of 250 microseconds.
Claim 11
Dependent Claim
26 words
The device of claim 7 wherein the stimulator pulse frequency varies between 20 and 50 Hz (pulses per second), with a preferred frequency of 35 Hz.
Claim 12
Dependent Claim
29 words
The device of claim 7 wherein the stimulator provides a low pulse frequency of 2 to 10 Hz can be generated for prolonged muscle preconditioning prior to tetanic activation.
Claim 13
Dependent Claim
113 words
A cardiac assist device for augmenting blood flow from the left ventricle to the aorta in synchrony with the ventricular repolarization of the patient's heart : omprising: • an elastic spherical pumping chamber surrounded by a sheath of innervated autogenous muscle tissue; • a T-connection of said chamber to the transected aorta; • a pulse generator adapted to be coupled to a first and second electrode; • wherein said first electrode is adapted to be coupled to said autogenous muscle tissue for stimulation and adapted to be coupled to said pulse generator; and • wherein said second electrode is adapted to be coupled to said ventricle for sensing end repolarizations of ventricular tissues.
Claim 14
Dependent Claim
113 words
A cardiac assist device for augmenting blood flow from the left ventricle to the aorta in synchrony with the ventricular repolarization of the patient's heart : omprising: • an elastic spherical pumping chamber surrounded by a sheath of innervated autogenous muscle tissue; • a T-connection of said chamber to the transected aorta; • a pulse generator adapted to be coupled to a first and second electrode; • wherein said first electrode is adapted to be coupled to said autogenous muscle tissue for stimulation and adapted to be coupled to said pulse generator; and • wherein said second electrode is adapted to be coupled to said ventricle for sensing end repolarizations of ventricular tissues.
Claim 15
Dependent Claim
123 words
A cardiac assist device for augmenting blood flow from the left ventricle to the aorta in synchrony with the ventricular repolarization of the patient's heart comprising: • an elastic spherical pumping chamber surrounded by a sheath of innervated autogenous muscle tissue; • a T-connection of said chamber to the transected aorta; • an alternative U-connection of said chamber to the descending aorta; • a pulse generator adapted to be coupled to a first and second electrode; • wherein said first electrode is adapted to be coupled to said autogenous muscle tissue for stimulation and adapted to be coupled to said pulse generator; and ' wherein said second electrode is adapted to be coupled to said ventricle for sensing end repolarizations of ventricular tissues.
Claim 16
Dependent Claim
123 words
A cardiac assist device for augmenting blood flow from the left ventricle to the aorta in synchrony with the ventricular repolarization of the patient's heart comprising: • an elastic spherical pumping chamber surrounded by a sheath of innervated autogenous muscle tissue; • a T-connection of said chamber to the transected aorta; • an alternative U-connection of said chamber to the descending aorta; • a pulse generator adapted to be coupled to a first and second electrode; • wherein said first electrode is adapted to be coupled to said autogenous muscle tissue for stimulation and adapted to be coupled to said pulse generator; and ' wherein said second electrode is adapted to be coupled to said ventricle for sensing end repolarizations of ventricular tissues.
Claim 17
Dependent Claim
24 words
The device of claim 12 or claim 13 wherein said chamber has a volume between 30 and 70 ml and most preferably 50 ml.
Claim 18
Dependent Claim
20 words
The device of claim 12 or claim 13 wherein the counterpulsations are used to offset the primary or essential hypertension.
References Cited (Backward Citations)
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