GB2156443A
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GB
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Blood pump
Assignee: Astra Tech AB
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Filing: 1985-03-15
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Granted: —
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Expires: 2005-03-15
Abstract
Abstract A blood pump comprises an atrium chamber defined by flexible walls and having an inlet and an outlet, a ventricle chamber defined by flexible walls and having an inlet and an outlet, a passage communicating the outlet of the atrium chamber with the inlet of the ventricle chamber, a first one-way valve in the passage adapted to permit blood flow only from the atrium chamber to the ventricle chamber, and a second one-way valve in the outlet from the ventricle chamber adapted to permit blood to flow through the outlet only out of the ventricle chamber. The chambers are movably supported in a casing having first and second openings, the atrium chamber inlet being fastened to the first opening and the ventricle chamber outlet to the second opening. A drive device cyclically moves the walls of the ventricle chamber to decrease its volume and expel blood from it while simultaneously moving the walls of the atrium chamber such that its volume may increase upon inflow of blood into the inlet to it. The drive device includes a drive ring surrounding and joined to the passage and having a surface engageable with the walls. of the ventricle chamber over a selected area such that the pressure of blood entering the chambers between driven strokes of the drive device controls the output of the blood pump by establishing the magnitude of the return stroke of the drive ring as a function of a pressure force acting over the area of engagement between the drive ring and the walls of the ventricle chamber.
Inventors
- 👤 Stig Lundback
Bibliographic Details
Application Number
—
Jurisdiction
GB
Data Source
google_patents
Last Synchronized
2026-10-23 01:57
CPC Classifications
A; A61; A61M; A61M60/00; A61M60/80; A61M60/855; A61M60/89; A61M60/894; A61M1/00; A61M60/10; A61M60/122; A61M60/196; A61M60/40; A61M60/424; A61M60/438; A61M60/441; A61M60/835; A61M60/837; A61M60/871; A61M60/873; A61M60/876; A61M60/126; A61M60/148
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
281 words
A blood pump comprising an atrium cham- ber defined by flexible walls and having an inlet and an outlet, a ventricle chamber defined by flexi ble walls and having an inlet and outlet, a passage 115 communicating the outlet of the atrium chamber with the inlet of the ventricle chamber, a first one way valve in the passage adapted to permit blood flow only from the atrium chamber to the ventricle chamber, a second one-way valve in the outlet from the ventricle chamber adaptPd to permit blood to flow through the outlet only out of the ventricle chamber, a casing having first and second openings, means connecting the atrium chamber inlet to the first opening and the ventricle chamber 125 outlet to the second opening such that the flexible walls defining the chambers are movably sup ported in the casing, and drive means for periodi cally moving the walls of the ventricle chamber to decrease the volume thereof and expel blood 130 therefrom while simultaneously moving the walls of the atrium chamber such that its volume may increase upon inflow of blood into the inlet thereto, the drive means including a drive ring sur- rounding and joined to the passage and having a surface engageable with the walls of the ventricle chamber, and said surface being engageable over a selected area such that the pressure of blood entering the ventricle chamber between driven strokes of the drive means controls the output of the blood pump by establishing the magnitude of the return stroke of the driving ring as a function of a pressure force acting over the area of engagement between the drive ring and the walls of the ventricle chamber.
Claim 2
Dependent Claim
281 words
A blood pump comprising an atrium cham- ber defined by flexible walls and having an inlet and an outlet, a ventricle chamber defined by flexi ble walls and having an inlet and outlet, a passage 115 communicating the outlet of the atrium chamber with the inlet of the ventricle chamber, a first one way valve in the passage adapted to permit blood flow only from the atrium chamber to the ventricle chamber, a second one-way valve in the outlet from the ventricle chamber adaptPd to permit blood to flow through the outlet only out of the ventricle chamber, a casing having first and second openings, means connecting the atrium chamber inlet to the first opening and the ventricle chamber 125 outlet to the second opening such that the flexible walls defining the chambers are movably sup ported in the casing, and drive means for periodi cally moving the walls of the ventricle chamber to decrease the volume thereof and expel blood 130 therefrom while simultaneously moving the walls of the atrium chamber such that its volume may increase upon inflow of blood into the inlet thereto, the drive means including a drive ring sur- rounding and joined to the passage and having a surface engageable with the walls of the ventricle chamber, and said surface being engageable over a selected area such that the pressure of blood entering the ventricle chamber between driven strokes of the drive means controls the output of the blood pump by establishing the magnitude of the return stroke of the driving ring as a function of a pressure force acting over the area of engagement between the drive ring and the walls of the ventricle chamber.
Claim 3
Dependent Claim
43 words
A blood pump according to claim 1, wherein the drive means engages the drive ring only during the driven stroke of the pump and disengages from the drive ring and moves to a retracted posi- tion during the return stroke of the pump.
Claim 4
Dependent Claim
49 words
A blood pump according to claim 1 or 2, wherein the casing is hermetically sealed and contains a gas exteriorly of the chambers, the pressure of which varies as a function of the variation of the instantaneous total volume of the chambers and thereby influences the inflow of blood.
Claim 5
Dependent Claim
23 words
A blood pump according to claim 3, and comprising pressure control valve means for controlling the pressure of the gas in the casing.
Claim 6
Dependent Claim
36 words
A blood pump according to claim 4, and further comprising an enclosure containing the casing and all components of the drive means and pressure control valve means communicating the interior of the casing with the enclosure.
Claim 7
Dependent Claim
33 words
A blood pump according to any one of the preceding claims, wherein the atrium and ventricle chambers and the passage are portions of a onepiece hose-like member of flexible and substantially non-extensible material.
Claim 8
Dependent Claim
44 words
A blood pump according to any one of the preceding claims, wherein the inlet to the atrium chamber and the outlet from the ventricle chamber are at generally opposite ends of the casing and are also generally opposite the passage across the respective chambers.
Claim 9
Dependent Claim
39 words
A blood pump according to claim 7, wherein the chambers and passage are substantially symmetrical rotationally about an axis of symmetry defined by a line joining the inlet to the atrium chamber and the outlet from the ventricle chamber.
Claim 10
Dependent Claim
34 words
A blood pump according to claim 8, wherein the casing and the drive ring are substantially symmetrical rotationally about an axis of symmetry coincident with the axis of symmetry of the chambers and passage.
Claim 11
Dependent Claim
60 words
A blood pump according to any one of claims 1 to 9, wherein portions of the walls of each chamber are engageable during portions of each operating cycle between a surface of the drive ring and an interior wall surface of the casing, and wherein the surfaces engageable with the respective chamber walls are dish-shaped and of generally complementary shapes.
Claim 12
Dependent Claim
119 words
A blood pump according to any one of 7 GB 2 156 443 A 7 claims 1 to 5, wherein the inlet passage, the atrium chamber, the passage between the atrium and ventricle chambers, and the part of the ventricle chamber which is bordering to the passage be- tween the atrium and ventricle chambers and which during a complete operating cycle does not permanently remain engaged with an interior wall surface are substantially rotationally symmetrical about an axis defined by a line joining the inlet to the atrium chamber and the passage between the atrium chamber and the ventricle chamber, and wherein the outlet from the ventricle chamber is located at an angle oblique or perpendicular to said axis.
Claim 13
Dependent Claim
25 words
A blood pump according to claim 10, wherein the drive device is arranged adjacent to the portion of the ventricle chamber bordering to the casing.
Claim 14
Dependent Claim
38 words
A blood pump according to claim 10, or 11, wherein the surface of the drive ring that engages one of the chambers is convex and the surface of the drive ring that engages the other chamber is concave.
Claim 15
Dependent Claim
76 words
A blood pump according to claim 13, wherein the convex portion of the interior wall surface of the casing engaging with part of the atrial chamber wall is made to substantially affect the volume of said atrium chamber between driven strokes in a way that a maximum in the total volume of the atrium and ventricle chambers ensues substantially before the drive ring reaches its mechanical limit of movement in the direction of the atrial chamber.
Claim 16
Dependent Claim
83 words
A blood pump according to claim 10, 11, 12 or 13, wherein the area of the surface of the drive ring that engages the ventricle chamber is substantially greater than the area of the surface of the drive ring that engages the atrium chamber during a substantial part of the return stroke of the pump, whereby the volume of blood taken into the pump between driven strokes is a function of the pressure of the blood entering the chambers during the return stroke.
Claim 17
Dependent Claim
62 words
A blood pump according to any one of claims 10 to 15, wherein the portions of the walls of each chamber, which during a complete operating cycle remain engaged with a surface of the driving ring or an interior wall surface of the casing, are completely or partially replaced by said surfaces of the driving ring or of the casing interior wall.
Claim 18
Dependent Claim
54 words
A blood pump according to claim 16, wherein the portions of the walls of the atrium and ventricle chamber to be replaced are preferentially the portion of the atrium chamber engaged with the surface of the drive ring, or the portion of the ventricle chamber engaged with the wall of the casing, or both.
Claim 19
Dependent Claim
60 words
A blood pump, constructed and adapted to operate substantially as hereinbefore described with reference to Figures 1, 2 and 3A to 3D, or to Figure 4, or to Figure 5 of the accompanying drawings. Printed in the UK for HMSO, D8818935, 8185, 7102. Published by The Patent Office, 25 Southampton Buildings, London, WC2A lAY, from which copies may be obtained.
Claim 20
Dependent Claim
60 words
A blood pump, constructed and adapted to operate substantially as hereinbefore described with reference to Figures 1, 2 and 3A to 3D, or to Figure 4, or to Figure 5 of the accompanying drawings. Printed in the UK for HMSO, D8818935, 8185, 7102. Published by The Patent Office, 25 Southampton Buildings, London, WC2A lAY, from which copies may be obtained.
References Cited (Backward Citations)
No citation records indexed.
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