CN2154027Y

CN2154027Y - Artificial blood vessel for medical

Info

Publication number: CN2154027Y
Application number: CN93217052U
Authority: CN
Inventors: 杨传瑞; 孙衍庆
Original assignee: Beijing Research And Treatment Centre Of Pulmonary And Cardiovascular Diseases (
Current assignee: Beijing Research And Treatment Centre Of Pulmonary And Cardiovascular Diseases (
Priority date: 1993-07-02
Filing date: 1993-07-02
Publication date: 1994-01-26
Anticipated expiration: 2003-07-02

Abstract

The utility model relates to an artificial blood vessel for medical application. Both ends of the artificial blood vessel are respectively provided with a Ti-Ni memory-alloy ring. After both ends of the artificial blood vessel are folded over, the alloy rings are lapped, sewn and fixed inside the artificial blood vessel. Two non-skid bands which are parallel to an interface are sewn at the inner periphery surface of the artificial blood vessel at the folding position. The artificial blood vessel can be conveniently used in blood vessel transplantation operations. When the utility model is used, user first forms the memory ring and inserts the memory ring into the blood vessel of the human body, and the memory ring recovers memory shape in the condition of a moderate temperature. The utility model has simple and convenient operation and high safety, and shortens operation time.

Description

Artificial blood vessel for medical

This utility model relates to a kind of medical artificial blood vessel.

In the prior art, the U.S. at first adopted the artificial blood vessel of being with becket in the endoluminal vascular grafting in the thoracoabdominal aorta reconstruction operations in 1978.It is fixed and open that at present the artificial blood pipe ring that uses is divided into sealing, is rustless steel or titanium alloy is made.

The shortcoming of sealing fixed ring existence is: can not be out of shape in migration process, therefore at the metal canula position, oppress the degeneration or the damage that can cause aorta wall with the faciola ligation, to such an extent as to grafting vessel is deviate from.For the unconspicuous arterial disease of expansion, implant very difficulty of such artificial blood vessel, even the generation aortic tunica intima is torn.Sometimes take place narrowly at artificial blood vessel and aorta wall place, easily form thrombosis.Ligation is difficult for the location.

Open becket is divided into spring-backed quill and distortion ratchet ring again:

Fig. 1 is the spring-backed quill structure chart

Fig. 2 is distortion ratchet ring structure chart

As Fig. 1: spring-backed quill 1 is to be curled by elastic stainless steel to form, and before implantation, pressurization diminishes spring-backed quill, and fixes with vascular forceps, implant aorta after, decontrol vascular forceps, spring-backed quill automatically returns to original diameter by elastic force.Its shortcoming is: can not ligation, and only rely on the pressure of elastic expansion to fix artificial blood vessel, thereby artificial blood vessel easily takes place deviate from.

As Fig. 2: distortion ratchet ring 2 also is to be curled by corrosion resistant plate to form.There is lap at the two ends of ring.By pressurization diameter is diminished, fix with vascular forceps then.After in implanting lumen of artery, unclamp fixation clamps, vascular forceps is extended in the artificial blood vessel, it is expanded to original diameter.This encircles eclipsed medial extremity a ratchet, and when ring returned to original diameter, ratchet was stuck in the indentation, there of outboard end, made it fixing, added the ligation band.Shortcoming is a complicated operation, and the ratchet place easily causes the aorta wall necrosis.

The purpose of this utility model is: provide a kind of easy to operate, be difficult for slippage, the safe artificial blood vessel that has the ti-ni shape memory alloy ring.

Main points of the present utility model are: a ti-ni shape memory alloy ring is respectively overlapped at the two ends of artificial blood vessel.After the artificial blood vessel turnover of two ends, alloy hoop is wrapped between the two-layer artificial blood vessel and sutured.The inner peripheral surface at artificial blood vessel upset position is sewed with the twice non-skid band parallel with interface.So that after transplanting, with the belt location ligation of broad.

Above-mentioned ti-ni shape memory alloy ring is a round barrel shape.

Effect of the present utility model: because this utility model is with the ti-ni shape memory alloy ring at the artificial blood vessel two ends, and be integral with the artificial blood vessel sutured, therefore, can band position folder be sold off shape in the uniform temperature condition before the implantable intravascular, insert easily in people's the blood vessel.After the insertion, the shape of memory ring automatic refresh memory under the temperature conditions of blood, blood vessel is close in the quality hardening, and no eddy current, no thrombosis form, and bring great convenience to blood vessel grafting.Safety, reliable has obviously reduced operating time, can foreshorten to 2 minutes by original 4 minutes.In addition, non-skid band is arranged, can use the ligation band of broad in memory ring portion position at the artificial blood vessel medial surface that turns down, convenient fixing, not slippage reduces the pressure to blood vessel wall, avoids blood vessel injury.

Below in conjunction with embodiment this utility model is described in detail.

Fig. 3 is a structural representation of the present utility model.

The schematic diagram that Fig. 4, Fig. 5, Fig. 6 be ti-ni shape memory alloy ring tubbiness original shape, be out of shape and resile arbitrarily.

Fig. 7 is the connection diagram behind this artificial blood pipe implant into body blood vessel.

As shown in Figure 3: with two round barrel shape Ti-Ni alloy memory rings of handling well 3, be enclosed within the two ends of one section artificial blood vessel 4 respectively, after the turnover of two ends artificial blood vessel, alloy hoop is wrapped between the two-layer artificial blood vessel, and sutured.The inner peripheral surface at artificial blood vessel upset position is sewed with twice non-skid band 5, and this non-skid band is parallel to interface and keeps at a certain distance away, with the ligation band of location broad.

As Fig. 4, Fig. 5, shown in Figure 6: before carrying out vascular transplant, the two ends that are with the ti-ni shape memory alloy ring are inserted-2 ℃--in 6 ℃ of water at low temperature, this moment the ti-ni shape memory alloy ring quality dead-soft that becomes, at this moment it is converted into any convenient shape of inserting blood vessel, implant far away, the near-end intracavity of tremulous pulse respectively, the ti-ni shape memory alloy ring is heated when human temperature is spent, and promptly returns to original diameter, it is hard that quality becomes, and be fixed in the lumen of artery.Then as shown in Figure 7: the position between two non-skid bands of aorta outside memorial alloy ring, carry out ligation with belt.

Claims

1, a kind of medical artificial blood vessel, it is characterized in that: a ti-ni shape memory alloy ring (3) is respectively overlapped at the two ends of artificial blood vessel (4), after the artificial blood vessel turnover of two ends, be wrapped between the two-layer artificial blood vessel alloy hoop (3) and sutured, the inner face at artificial blood vessel (4) upset position is sewed with twice non-skid band (5).

2, artificial blood vessel according to claim 1 is characterized in that, described ti-ni shape memory alloy ring is a drum shape.