CN2433954Y

CN2433954Y - Biparted heart valve

Info

Publication number: CN2433954Y
Application number: CN 00204700
Authority: CN
Inventors: 张令天; 张大幕
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-03-02
Filing date: 2000-03-02
Publication date: 2001-06-13
Anticipated expiration: 2010-03-02

Abstract

The utility model provides a double-leaf heart valve composed of valve seats, two valve leaves which are symmetrically arranged and a suture ring. Flanges of rotary joints of the two symmetrical valve leaves and grooves of the rotary joints of the corresponding valve seats form a similar ball and socket structure; the bottoms of the grooves of the valve seats are spherical surfaces, and the edges form * shapes which are similar to rectangular shapes; the inflow ends of the two couples of the grooves are provided with valve leaf opening steps; the grooves of the valve seats are arranged on the straight walls of the planes in convex peaks. The shape and the size of the flange of the rotary joint of each valve leaf are corresponding to and matched with the shape and the size of each groove of the valve seat and a valve opening of the valve seat; each valve leaf can be designed to have the surfaces having various shapes. The utility model has the advantages that the grooves which are similar to rectangular shapes can be easily processed; the precision can be easily controlled, the viscous flow and the turbulent flow can be reduced; the utility model is good for blood stream to wash the rotary joints, and the thrombus formation can be reduced; compared with the condition that the interior of each groove is provided with a limit step, the condition that the exterior of each groove is provided with a limit step has the advantages that the flange torsion of the valve leaves is low and the impact and the vibration can be reduced, and the reliability is improved. The valve is suitable for valve replacement.

Description

Bileaflet heart valve

This utility model belongs to artificial organ in the biomedical engineering, specifically relates to a kind of novel bileaflet heart valve.

Serious pathological changes takes place and loses function in the cardiac valve of human body (abbreviation valve), can utilize the artificial valve to replace, and the developmental stage of spherical valve, single leaf valve, bilobate valve has been experienced in artificial valve's research and development.The structure of bilobate valve is that a pair of lobe leaf is set in the lobe seat, and the lobe seat is sewn in the heart by suture ring.Along with the pulsation of heart contraction, diastole and blood flow, the keying that the lobe leaf can be freely.Selection, shape, the setting of cradle head, structure, lobe airfoil surface, keying limit method for valve all require meticulous design, and wherein cradle head is comparatively crucial.Require valve to have excellent biological compatibility, high strength, wear-resistant opens and closes flexibly, even flow field, less viscous flow, light turbulent flow, and comprehensive flushing does not adhere to blood, does not destroy blood component, thrombosis.

Existing bilobate valve is as St.jude, for many years clinical and suitability for industrialized production of multiple high-quality valve such as CarbonMedics.But the cradle head of all bilobate valves all is class dumbbell shape or dish, and the lobe leaf is opened, closed spacing shelves and all is located in the lobe seat cradle head groove, and not only confined planes is nearer, lobe leaf keying impact can cause trembles, also can increase the weight of to remain in a standstill and turbulent flow, hinder flushing, increase the thrombosis probability.

The purpose of this utility model provides a kind of novel bileaflet heart valve, and this valve has improved structure, position, limit method and the lobe airfoil surface of cradle head, increases the cradle head area of passage and can reduce viscous flow, turbulent flow, reduces resistance and strengthens flushing.The lobe leaf opens and closes more flexibly, safety, the suitability that further improves valve.

This utility model is by providing bilobate valve with following structure to realize.This novel bilobate valve is made up of lobe seat, two symmetrically arranged lobe leaves, suture rings: each lobe leaf of described valve has a pair of cradle head flange, the pairing lobe seat of the cradle head flange cradle head groove that it is characterized in that described lobe leaf is arranged on the lobe seat and becomes a mandarin on the protruding peak inner plane of end or on the arcwall face, the cradle head recess edge is the class rectangle Or circular, its bottom is a sphere.The cradle head groove is provided with the lobe leaf outward and opens limiting block, forms the plane between two limiting blocks, moves when opening and closing for the lobe leaf.When limiting block and cradle head recess sidewall stop simultaneously unlatching lobe leaf, limit and understand lobe leaf opening angle; When the lobe leaf was closed, two lobe leaves became a mandarin and hold the inclined-plane closure, while lobe leaf flange both sides and lobe seat groove contact both sides, and lobe leaf arc edge also contacts with lobe seat ring-shaped inner wall simultaneously, stop.Described lobe leaf cradle head flange goes out to flow side arc edge ovalize, and floor projection is circular arc when closed position, and mates with described lobe seat ring-shaped inner wall; Described suture ring is arranged on the outer wall cannelure of described lobe seat.

Described lobe seat cradle head groove can be Shape, bottom portion of groove can be sphere or plane, and the structure shape face of the cradle head flange of described lobe leaf and described cradle head groove adapts.

Described lobe leaf can be the plane, or streamline surface, or the arc profile, or wing profile.

The end that becomes a mandarin of described lobe seat ring has protruding peak or the protruding peak of tool not, goes out the stream end or is flat annular of circle or undulate.

Described suture ring is located on the described lobe seat outer wall annular groove, and aorta stand-up collar shape, Bicuspid valve are hated available biological alloy spring enhancing in medicated cap shape, the suture ring, prevent the distortion of lobe seat.

The leaf valve opens and closes mechanism: two lobe leaves can open and close in the lobe seat flexibly.The lobe leaf is opened under blood flow promotes, and the cradle head flange of lobe leaf rotates in the cradle head groove of lobe seat, and subtended angle strengthens gradually.When cradle head flange both sides contacted with the straight wall of cradle head groove class rectangle, simultaneously the lobe leaf side straight line edge side that becomes a mandarin contacted the stop of lobe leaf with the outer limiting block of lobe seat groove.At this moment, the lobe leaf reaches maximum open angle.When the lobe leaf is promoted by the blood flow rhetorical question, the lobe leaf begins to close, lobe leaf subtended angle diminishes rapidly, final lobe leaf cradle head flange side contacts with the straight wall in lobe seat cradle head groove side, the two lobe leaves knife-edge end face driving fit that becomes a mandarin simultaneously, two lobe leaf arc edges also contact with lobe seat ring shape inwall, the stop of lobe leaf reaches given dwell angle.Cradle head flange and groove is complementary, can prevent that the lobe leaf from deviating from lobe leaf opening-closing process, when the lobe leaf is closed, cradle head tongue and groove contact surface maximum, the gap minimum can prevent excessive leakage current.

The utility model has the advantages that: lobe seat cradle head bottom portion of groove is sphere, and the edge is class rectangle or circle, handling ease, and precision is easily controlled, and remains in a standstill light, turbulent lacking than dumbbell shape or dish-shaped groove, and flushing thoroughly is difficult for generating thrombosis; Enlarged the spacing arm of force at lobe seat cradle head groove peripheral hardware limiting block, alleviated lobe leaf flange torsion, alleviated the keying impulsive force, elimination lobe leaf is hit and trembles.

Below in conjunction with drawings and Examples this utility model is described further.

Fig. 1 is that the organigram one lobe leaf of this utility model bilobate valve is positioned at the opening vertical view, omits suture ring among the figure, only shows the suture ring mounting groove.Below each figure all like this;

Fig. 2 is the view along A-A cutd open among Fig. 1;

Fig. 3 is the view along B-B cutd open among Fig. 1;

Fig. 4 is that this utility model bilobate valve lobe leaf is positioned at the closure state vertical view;

Fig. 5 is the view that is cutd open along Fig. 4 C-C;

Fig. 6 is the another kind of type of this utility model bilobate valve, and lobe seat groove is positioned at the vertical view of protruding peak arc inner wall;

Fig. 7 is the view that is cutd open along Fig. 6 D-D;

Fig. 8 is novel another type of bilobate valve, and lobe seat groove is positioned on the protruding peak inner plane, and the inwall of lobe seat ring is the wholecircle cylinder;

Fig. 9 is the view that is cutd open along Fig. 8 E-E;

Figure 10 is that corresponding lobe seat groove is the lobe leaf of the various profiles of sphere bottom (dwell angle α) horizontal projection when being positioned at closed position;

Figure 11 is plane lobe leaf closed position (dwell angle α) side view;

Figure 12 is streamline surface lobe leaf closed position (dwell angle α) side view;

Figure 13 is arc shaped surface lobe leaf closed position (dwell angle α) side view;

Figure 14 is airfoil lobe leaf closed position (dwell angle α) side view;

Figure 15 is lobe leaf that corresponding lobe seat groove is the various profiles of a planar base horizontal projection when being positioned at closed position.

With reference to Fig. 1～Fig. 5 with novel bilobate valve example with the lobe leaf of the lobe seat of cradle head groove at the bottom of protruding peak, planar inner wall, the class rectangular ball and respective planes profile.This utility model bilobate valve 10, form by lobe seat 20, lobe leaf 30, suture ring (summary).This valve is characterised in that: the two pairs of cradle head grooves 21 are located at lobe seat 20 and become a mandarin on the planar inner wall 23 at the protruding peak 22 of end.Every pair of groove 21 is Class rectangle, each groove have 21.1 and 21.2 two sides, and bottom land is a sphere 21.3.Every pair of outer side that becomes a mandarin of groove is established plane breach 24, and the open limiting block 25 of lobe leaf is established in the breach both sides, and the lobe mouth 26 of lobe seat 20 is

Shape.Suture ring mounting groove 29 is established in the outside of the annular wall 28 of lobe seat.Lobe leaf 30, its cradle head flange 31 is complementary with lobe seat cradle head groove 21, keep certain interval 41, lobe leaf flange goes out to flow side and carries out the transition to arc edge 33 through straight line edge 32, its floor projection when closed position (dwell angle α) is circular arc and lobe seat-arc shaped surface is complementary, local contact or possess certain interval 42, the lobe leaf cradle head flange side that becomes a mandarin carries out the transition to knife-edge edge 35 through straight line edge 34.When the lobe leaf was closed, two lobe leaf knife-edge edge 35 were in contact with one another closure.Lobe leaf

straight line fate

32,34 and plane, the protruding peak of

lobe seat

23,24 are complementary, and keep certain glade plane space 43.Fig. 1～3 and Fig. 4,5 illustrate the open and closure state of lobe leaf respectively.Flange 31 rotated in lobe seat groove 21 when the lobe leaf was open, when the lobe leaf reaches maximum open angle α (α＜90 °), the both sides 31.1 and 31.2 of lobe leaf cradle head flange 31 respectively with the straight wall 21.1 of cradle head groove and 21.2 near to or in contact with, simultaneously the side 34.1 of the straight line edge 34 of two lobe leaves also contact with the open limiting block 25 of lobe seat, stop.The lobe leaf forms three

efferent tracts

44,45,46 when open, when reaching maximum open angle α, and three efferent tract area maximums.Fig. 4 and Fig. 5 illustrate the valve closure state.This moment, lobe leaf cradle head flange both sides 31.3 contacted with lobe seat cradle head recess sidewall 21.1,21.2 respectively with 31.4, the two lobe leaves end knife-edge edge 35 closed mutually contacts that become a mandarin simultaneously go out to flow arc edge 33 and contact with lobe seat arc cylinder 27 parts or keep certain interval 42.Two lobe leaf closure states and horizontal sextant angle are dwell angle α, and two lobe leaves open and close under blood flow promotes, and permission or prevention blood flow are engaged in this profession by central authorities of lobe interruption-forming and two effluents, and lobe leaf closure allows to backflow on a small quantity and leakage current.

Lobe seat 20 configurations can be with protruding peak 22, also can not have recessed peak, (figure slightly).

Cradle head groove 21 can be the class rectangle, also can be rounded (figure slightly), bottom portion of groove is spherical rotation joint groove and can be located in the protruding peak of lobe seat on the planomural, also can be located at (Fig. 6, Fig. 7) on the protruding peak intrados.

Lobe seat ring portion inwall lobe mouth is

Shape also can be wholecircle shape (Fig. 8, Fig. 9).

Lobe leaf 30 can be plane (Figure 11) or streamline surface (Figure 12) or camber line profile (Figure 13) or wing profile (Figure 14) lobe leaf cradle head flange 31 and adapt with lobe seat cradle head groove 21, bottom portion of groove is sphere or plane, shape, size are corresponding, keep suitable running clearance.Suture ring is installed on the outer mounting groove 29 of lobe seat ring portion.

Claims

1. bileaflet heart valve, it is made up of lobe seat, two symmetrically arranged lobe leaves, suture rings, it is characterized in that: two pairs of lobe leaf cradle head flanges are the class socket arrangement with corresponding lobe seat cradle head groove, and lobe seat bottom portion of groove is sphere, the groove limit is the class rectangle

Shape; The side that becomes a mandarin of two pairs of grooves is provided with the lobe leaf and opens limiting block; Lobe seat groove and limiting block are located at the lobe seat and become a mandarin on the inner plane at the protruding peak of side; The corresponding cooperation of shape and size of the two pairs of lobe leaf cradle head flanges and the leaf shape of lobe, size and lobe seat groove and lobe seat lobe mouth; Two lobe leaves are when closed position (dwell angle α), the two lobe leaves side tool shape straight line edge that becomes a mandarin is closed mutually, flange and adjacent straight line edge and go out to flow side arc edge and protruding peak inner plane, groove and the arc cylinder of lobe seat corresponding site and be complementary and locally contact or possess certain interval, central authorities of formation, two effluents were engaged in this profession when two lobe leaves were open, reached maximum open angle during stop; Described suture ring is provided with outside the lobe seat ring portion in the suture trough.

2. bileaflet heart valve according to claim 1 is characterized in that described cradle head groove is rounded, and its bottom be sphere or plane, establishes the lobe leaf and open to keep off in the groove side side that becomes a mandarin.

3. bileaflet heart valve according to claim 1 and 2, the lobe seat that the it is characterized in that described bilobate valve end that becomes a mandarin has protruding peak or does not have protruding peak structure, and the cradle head groove is established protruding peak or do not had on the inner plane of protruding peak structure or on the intrados, lobe seat ring portion lobe mouth is

Shape or circle.

4. according to claim 1 or 2 or 3 any one described bileaflet heart valve, it is characterized in that described lobe leaf is the plane profile, or streamline surface, or the arc profile, or wing profile.