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公开(公告)号：CA2297914C
公开(公告)日：2006-10-03
申请号：CA2297914
申请日：1998-07-22
Applicant: BAXTER INT
Inventor： CARPENTIER ALAIN , NGUYEN THAN , LAM HUNG , CARPENTIER ALEXANDRE , HUYNH VAN LE , CUNANAN CRYSTAL
Abstract: An expandable annuloplasty ring which may either expand spontaneously, in situ, as the patient grows or be expanded by surgical intervention by balloon dilatation. The distensible annuloplasty ring of the invention may be usable in pediatric patients whose growth, subsequent to surgical implantation of the ring, will necessitate subsequent enlargement of the ring to accommodate growth of the annulus. The ring may include relatively expandable segments to enable the enlargement thereof. The ring segments may include engaging teeth which cooperate with notches or slots formed in the tubes to provide some resistance to ring distention, while preventing collapse of the ring in the opposite direction. The teeth may be of different sizes or shapes to regulate the amount of force needed to expand the ring at different stages of the patient 's growth. Alternatively, the adjustable ring includes a solid core of non-elastic material which plastically retains its shape upon natura l expansion of the annulus, or after surgical expansion. In one embodiment, segments are coupled together with a discontinuity around the ri ng periphery. Pivot regions are provided between adjacent segments that, along with the discontinuity, enable the ring to expand upon annulus growth. The discontinuity may be positioned along the anterior side of the ring or around the posterior side. A further versio n makes use of telescoped segments with no discontinuity. The segments are coupled together with tubular sheaths, and expand without decoupling. A fabric covering may be omitted.
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Patent Agency Ranking
公开(公告)号：CA2285233A1
公开(公告)日：1998-10-08
申请号：CA2285233
申请日：1998-04-02
Applicant: BAXTER INT
Inventor： HUYNH VAN LE , GUO XIAOMING G , LAM HUNG LY , ZHOU JIAMBO , KAFESJIAN RALPH , ROMERO CARLOS M , NGUYEN THAN
Abstract: Heart valve leaflet selection methods and apparatuses which subject individual leaflets to loads and measure the resulting deflection to more reliably group leaflets of similar physical characteristics for later assembly in prosthetic heart valves. The deflection testing may be accomplished using a variety of test set ups which are designed to impart a load on the leaflet which simulates the actual loading within a heart valve. The results from a number of deflection tests are used to categorize individual leaflets, which data can be combined with other data regarding the characteristics of the leaflet to better select leaflets for assembly into a multi-leaflet heart valve. In one embodiment, the deflection test is combined with an intrinsic load test, and leaflets having similar deflection and intrinsic load values used in the same heart valve. One apparatus for testing the leaflets includes a frame for securing the arcuate cusp of the leaflet while the straight coapting edge remains free, to simulate the actual leaflet mounting configuration within the heart valve prosthesis. The frame may include a lower portion having a recess for the leaflet and plurality of receptor holes around the peripheral edge of the recess, and an upper portion having a plurality of needles which extend downward through the leaflet and into the receptor holes and secure the edges of the leaflet.
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公开(公告)号：CA2284941C
公开(公告)日：2000-05-16
申请号：CA2284941
申请日：1998-03-25
Applicant: BAXTER INT
Inventor： NGUYEN THAN , KAFESJIAN RALPH , LAM HUNG LY , GUO XIAOMING G , HUYNH VAN LE
Abstract: Improved, adaptable tissue-type heart valves and methods for their manufacture are disclosed wherein a dimensionally stable, pre-aligned tissue leaflet subassembly is formed and its peripheral edge clamped between and attached to an upper shaped wireform and a lower support stent. A variety of adaptable structural interfaces including suture rings, flanges, and conduits may be attached to the support stent with or without an outlet conduit disposed about the wireform to provide a tissue-type heart valve adaptable for use in either a natural heart or in mechanical pumping devices.
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公开(公告)号：CA2297914A1
公开(公告)日：1999-02-04
申请号：CA2297914
申请日：1998-07-22
Applicant: BAXTER INT
Inventor： CARPENTIER ALAIN , CARPENTIER ALEXANDRE , LAM HUNG , NGUYEN THANH , HUYNH VAN LE , CUNANAN CRYSTAL
Abstract: An expandable annuloplasty ring which may either expand spontaneously, in situ, as the patient grows or be expanded by surgical intervention by balloon dilatation. The distensible annuloplasty ring of the invention may be usable in pediatric patients whose growth, subsequent to surgical implantation of the ring, will necessitate subsequent enlargement of the ring to accommodate growth of the annulus. The ring may include relatively expandable segments to enable the enlargement thereof. The ring segments may include engaging teeth which cooperate with notches or slots formed in the tubes to provide some resistance to ring distention, while preventing collapse of the ring in the opposite direction. The teeth may be of different sizes or shapes to regulate the amount of force needed to expand the ring at different stages of the patient's growth. Alternatively, the adjustable ring includes a solid core of non-elastic material which plastically retains its shape upon natural expansion of the annulus, or after surgical expansion. In one embodiment, segments are coupled together with a discontinuity around the ring periphery. Pivot regions are provided between adjacent segments that, along with the discontinuity, enable the ring to expand upon annulus growth. The discontinuity may be positioned along the anterior side of the ring or around the posterior side. A further version makes use of telescoped segments with no discontinuity. The segments are coupled together with tubular sheaths, and expand without decoupling. A fabric covering may be omitted.
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公开(公告)号：CA2285233C
公开(公告)日：2007-06-26
申请号：CA2285233
申请日：1998-04-02
Applicant: BAXTER INT
Inventor： ZHOU JIAMBO , LAM HUNG LY , NGUYEN THAN , KAFESJIAN RALPH , GUO XIAOMING G , HUYNH VAN LE , ROMERO CARLOS M
Abstract: Heart valve leaflet selection methods and apparatuses which subject individual leaflets to loads and measure the resulting deflection to more reliably group leaflets of similar physical characteristics for later assembly in prosthetic heart valves. The deflection testing may be accomplished using a variety of test set ups which are designed to impart a load on the leaflet which simulates the actual loading within a heart valve. The results from a number of deflection tests are used to categorize individual leaflets, which data can be combined with other data regarding the characteristics of the leaflet to better select leaflets for assembly into a multi-leaflet heart valve. In one embodiment, the deflection test is combined with an intrinsic load test, and leaflets having similar deflection and intrinsic load values used in the same heart valve. One apparatus for testing the leaflets includes a frame for securing the arcuate cusp of the leaflet while the straight coapting edge remains free, to simulate the actual leaflet mounting configuration within the heart valve prosthesis. The frame may include a lower portion having a recess for the leaflet and plurality of receptor holes around the peripheral edge of the recess, and an upper portion having a plurality of needles which extend downward through the leaflet and into the receptor holes and secure the edges of the leaflet.
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公开(公告)号：CA2284941A1
公开(公告)日：1998-10-08
申请号：CA2284941
申请日：1998-03-25
Applicant: BAXTER INT
Inventor： NGUYEN THAN , KAFESJIAN RALPH , LAM HUNG LY , GUO XIAOMING G , HUYNH VAN LE
Abstract: Prosthetic heart valve suture rings having a suturable annulus of a compliant internal member and a cloth covering. Three evenly spaced upwardly opening depressions formed on an internal circumference of the suturable annulus receive downwardly-directed cusps of a stent structure of the heart valve. The suture ring may include a silicone sponge waffle annulus having a walled lip on an inner circumference thereof. The lip is contoured to include the three depressions, and a ring washer mounts on the annulus surrounding the walled lip for added stiffness.
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