CN2248046Y

CN2248046Y - Non-stress elastic biological cardiac valve

Info

Publication number: CN2248046Y
Application number: CN 95210109
Authority: CN
Inventors: 朱晓东
Original assignee: Puhui Biomedicine Engineering Co Beijing City
Current assignee: Puhui Biomedicine Engineering Co Beijing City
Priority date: 1995-05-15
Filing date: 1995-05-15
Publication date: 1997-02-26
Anticipated expiration: 2005-05-15

Abstract

The utility model relates to an artificial heart valve which is characterized in that the upper seat of a valve seat is provided with a valve shelf which is provided with three convex valve angles homogeneously distributed on the circumference of the valve shelf. Every two valve angles are connected by a valve leave made of biological material. The lower parts of three valve leaves are connected with the lower circular arc parts of the valve shelf. The upper parts of the valve leaves are sliding parts. The valve leaves are opened or closed along with the normal direction flow and the reverse flow of blood. The valve shelf is composed of an elastic bracket and wrapping fabric wrapped outside. The valve shelf can be leaned inwards or outwards from a neutral point. Sutural methods among the valve shelfs, the valve seat, the valve leaves and a sutural margin are adopted. The utility model has long service life and no stress.

Description

Unstressed elastic biological cardiac valve

This utility model relates to a kind of Cardiac valve prosthesis.

At present, the bio-artificial cardiac valve is that material is made by all or part of animal tissue, resembles one-way cock, can be in the structure of the physiological location replacing whole valve of human body, and play the function of valve.But, obvious deficiency is being arranged, aspect durability and the calcification so influenced the life-span of valve with regard to present biovalve.

The purpose of this utility model provides a kind of unstressed elastic biological cardiac valve, and this valve life is long, can reduce the Cardiac valve prosthesis active force that host tissue bears, and helps the recovery and the wound healing of heart merit.

This utility model is realized by following manner.Be on the lobe seat, to be located in a lobe frame, the lobe frame has the lobe angle of three projectioies, be evenly distributed on the circumference of lobe frame, the lobe leaf made from a slice biomaterial between per two lobe angles connects, have three lobe leaves, the following circular arc portion of the bottom of lobe leaf and lobe frame links together, and lobe leaf top is the part of moving about.This part of moving about is called lobe leaf free edge.This lobe leaf free edge can be swung between two lobe angles.The lobe leaf of this biological cardiac valves is along with the positive flow of blood and reverse flow and closure or openness.Realize valvular function.

Be further described below in conjunction with accompanying drawing.

Fig. 1 is unstressed elastic biological cardiac valve outside drawing

Fig. 2 is the elastic movement sketch map of elastic support

Fig. 3 is the relative position and the connection layout of elastic support and lobe ring

Fig. 4 is the structure chart of lobe seat, lobe frame, lobe leaf

Fig. 5 is the stitching figure at lobe angle place's lobe frame and lobe leaf

This unstressed its outward appearance of elastic biological cardiac valve is located in a lobe frame 2 as shown in Figure 1 on lobe seat 1, lobe frame 2 has the lobe angle 3 of three projectioies, is evenly distributed on the circumference of lobe frame 2.The lobe leaf made from a slice biomaterial between per two lobe angles 34 connects, and has three lobe leaves 4, and the following circular arc portion 5 of the bottom of lobe leaf 4 and lobe frame 2 links together, and maintains static.The part of moving about on lobe leaf 4 tops is called lobe leaf free edge, and this free edge can be swung between two lobe angles 3.When three lobe leaf free edges were separated round tank of formation, this biological cardiac valves was opening, and blood supply liquid passes through.When three lobe leaf free edges combined, this biological cardiac valves was closed condition, when closing, and the passing through of block blood.The power source of this biological cardiac valves lobe leaf motion is flowing of blood, along with blood positive flow and reverse flow and closure or openness.Realize valvular function.

As shown in Figure 1,, there is a sutural margin 6 made from woven dacron to be sewn on the lobe seat 1, is used for being connected between valve and the host tissue at the periphery of lobe seat 1.

As shown in Figure 1, bioprosthetic valve leaf 4 is to be clipped between the last circular arc of the following circular arc portion 5 of lobe frame 2 and lobe seat 1, prevents that it is come off by the blood flow effect after sewing up.

Described lobe frame is made up of the infantees of elastic support, coated outside.Elastic support is the rubber-like steel wire rack made from rustless steel or titanium alloy steel, and infantees is a woven dacron.Its shape as shown in Figure 2, the elastic movement point of elastic support 20 is shown in arrow among Fig. 2.Can be lean-in from neutral point, leaning angle 21 is 8 °; Lean outward, camber angle 22 is 4 °.

This unstressed elastic biological cardiac valve is in when work, actually will bear very complicated blood flow motion, and it is seen for sake of convenience, in conjunction with Fig. 2, be exactly in brief: when valve is subjected to time spent of doing by (being forward) blood flow, elastic support 20 outwards opens, therefore, can enlarge and pass through area; When the time spent of doing of being returned blood flow, blood impacts the lobe leaf makes it closed, the lobe leaf then affects elastic support 20 (being the lobe frame) to shrink to the center, because the resilience of elastic support, can accept the impulsive force of backflowing lentamente, therefore because the lobe leaf is closed the water hammering power that is produced, lower the active force that backflows on a large scale in the time of can alleviating blood reflux effectively.Owing to the sort buffer effect, reduced the pulling force that bears of lobe leaf.Significantly the result is: (1) has improved the life-span of lobe leaf.(2) reduce the Cardiac valve prosthesis active force that host tissue bears, help the recovery and the wound healing of heart merit.

Described lobe seat is wrapped infantees by the lobe ring and is formed.The lobe ring is made with rustless steel or titanium alloy steel, and infantees is a woven dacron.As shown in Figure 1, when elasticity lobe frame 2 when being subjected to the pulling of lobe leaf 4, lobe seat 1 can be realized the support of its elastic reaction; Prevent again simultaneously that lobe frame 2 from producing elasticity and the plastic deformation that surpasses regulation, to keep the operate as normal of valve.

For guaranteeing the elasticity of the existing requirement of elastic support (being the lobe frame), can not produce unexpected distortion again, the relation of elastic support 20 (being the lobe frame) and lobe ring 10 has three equally distributed circular arcs 11 as shown in Figure 3 on the lobe ring 10, also fixed above the following circular arc portion of elastic support 20 just in time is sitting in.Label 23 among Fig. 2, Fig. 3 is depicted as the elasticity range of activity of elastic support 20.

Described lobe stand drops on the connected mode that reaches on the described lobe seat with described lobe leaf: three equally distributed circular arcs are arranged on the described lobe seat, the following circular arc portion of described lobe frame be by the lobe leaf lower seat in the above, from this valvular outside, the infantees of the infantees of described lobe frame, described lobe leaf, described lobe ring is stitched together.

Fig. 4 is the section of A position among Fig. 1, and demonstration lobe frame profile circular arc is located the mutual alignment between lobe frame, lobe seat, lobe leaf, the sutural margin bottom, and sewing method.As can be seen from Figure 4, lobe frame 2 in the above, the interface of the woven dacron of its Baogang's guide frame is stayed outside, the i.e. left side among Fig. 4; Being bioprosthetic valve leaf 4 below infantees, is lobe seat 1 (promptly being surrounded by the lobe ring of woven dacron) below again.From valve outside (being the left side Fig. 4) infantees on the infantees on the lobe frame 2, bioprosthetic valve leaf 4 and the lobe seat 1 is stitched together with stitching thread 24.When stitching thread 24 (being polyester thread) is strained, also just lobe leaf 4 is fixed on the lobe seat 1 tightly.Such structure is just shifted pin hole formed " tensile stress is concentrated " onto the outside of lobe leaf 4 working portions of biovalve.Eliminate bioprosthetic valve leaf 4 and born the probability that active force partly produces stress concentration.The wheel cloth of washing on the lobe seat 1 is sewn on the lobe ring by stitching thread 12.

In being connected as shown in Figure 5 of lobe angle place bioprosthetic valve leaf and lobe frame.Fig. 5 is the profile of B face position among Fig. 1, and per two lobe leaves 4 stick among the slit at lobe angle 3 also together, allows the lobe leaf 4 and woven dacron 25 suture location 26 places from the outside at 3 places, lobe angle unite by a seam, and takes out the top tension at line and lobe angle 3 from above.With the shape skill of handling needles of wandering, stitched together lobe leaf 4 then with the woven dacron 25 of lobe frame along elastic support 20, and on seal location 27, seal.When the blood positive flow, lobe leaf 4 is opened, on lobe leaf enable possition 28; When the blood reverse flow, lobe leaf 4 closures are on lobe leaf make position 29 (being on the dotted line position among Fig. 5).

Described lobe leaf is the bioprosthetic valve leaf of handling through the sulphuric acid chromic salts.

The lobe leaf of this valve is that its hot shrinkage temperature is between 82 ℃-95 ℃ through HC (being hydroxyl chromium) biochemical treatment.Strengthen the complexation of fibrous tissue, effectively raised the tensile strength of biological sheet and the ability of calcification.

The rustless steel of the lobe ring of the elastic support of described lobe frame, described lobe seat or the material of titanium alloy steel are 1Cr18Ni9Ti, 3J21, T12.Or the material of the similar above trade mark.

Claims

1, a kind of unstressed elastic biological cardiac valve, it is characterized in that it being on the lobe seat, to be located in a lobe frame, the lobe frame has the lobe angle of three projectioies, be evenly distributed on the circumference of lobe frame, the lobe leaf made from a slice biomaterial between per two lobe angles connects, have three lobe leaves, the following circular arc portion of the bottom of lobe leaf and lobe frame links together, and lobe leaf top is the part of moving about.

2, unstressed elastic biological cardiac valve according to claim 1, it is characterized in that: described lobe frame is made up of the infantees of elastic support, coated outside.

3, unstressed elastic biological cardiac valve according to claim 2 is characterized in that: described lobe seat is wrapped infantees by the lobe ring and is formed.

4, unstressed elastic biological cardiac valve according to claim 3, it is characterized in that: described lobe stand drops on the connected mode that reaches on the described lobe seat with described lobe leaf and is: three equally distributed circular arcs are arranged on the described lobe seat, the following circular arc portion of described lobe frame be by the lobe leaf lower seat in the above, from this valvular outside, the infantees of the infantees of described lobe frame, described lobe leaf, described lobe ring is stitched together.

5, unstressed elastic biological cardiac valve according to claim 4 is characterized in that: described lobe leaf is the bioprosthetic valve leaf of handling through the sulphuric acid chromic salts.

6, unstressed elastic biological cardiac valve according to claim 5 is characterized in that: the rustless steel of the lobe ring of the elastic support of described lobe frame, described lobe seat or the material of titanium alloy steel are 1Cr18Ni9Ti, 3J21, T12.