CN2176153Y

CN2176153Y - Dilator made of Ni-Ti shape memory alloy

Info

Publication number: CN2176153Y
Application number: CN 93226658
Authority: CN
Inventors: 秦桂英; 丁嘉安; 丁顺强; 姜格宁; 张雷
Original assignee: Shanghai No1 Pulmonary Department Hospital; SHANGHAI INST OF IRON and STEEL
Current assignee: Shanghai No1 Pulmonary Department Hospital; SHANGHAI INST OF IRON and STEEL; Shanghai Iron and Steel Research Institute
Priority date: 1993-12-02
Filing date: 1993-12-02
Publication date: 1994-09-07
Anticipated expiration: 2003-12-02

Abstract

The utility model relates to a dilator made of Ni-Ti shape memory alloy. The utility model is used particularly for dilating the narrow parts in the vessels of the human body, such as the trachea and the esophagus, and the narrow parts are caused by malignant or benign lesion. The utility model is characterized in that the Ni-Ti shape memory alloy wires are made into a spiral tube shape, and the external dimension of the spiral tube is determined according to clinical requirements; the both end parts of the spiral tube can be also wound and forms a horn opening shape.

Description

Dilator made of Ni-Ti shape memory alloy

A kind of niti-shaped memorial alloy dilator is used for expanding because of pernicious or the human pipeline that benign lesion causes such as the narrow positions of pipelines such as trachea, esophagus especially.

Often, pernicious or benign tumor block clinically because of causing patient airway, dyspnea, and critically ill.Often in the treatment adopt resection operation, but the trachea resection length just can't end to-end anastomosis when surpassing 6 centimeters.How to treat has two kinds of viewpoints at present, and the first advocates to adopt artificial trachea to substitute.But cause the considerable part patient dead at present because of artificial trachea material and effect are undesirable because of complication.It two is the narrow positions that advocate to adopt the tube placing operation expansion to block, and radiates smelting then and treats.Before this utility model, adopt the tee T silica gel tube to put pipe mostly.But this pipe is settled difficulty, and is easy to come off, and also easily leads to complications.

The purpose of this utility model is will develop a kind of can the convenience successfully to insert trachea or other pipeline, and can effectively expand the not caducous niti-shaped memorial alloy dilator of narrow positions.

Feature of the present utility model is to adopt excellent corrosion-proof performance, and the niti-shaped memorial alloy filament winding that the human body intermiscibility is good is made helix, and the overall dimensions of serpentine pipe is decided according to clinical needs.Because the unique shape memory characteristic of niti-shaped memorial alloy, when clinical use, earlier the dilator of helix is inserted in the frozen water, then will be in frozen water the material property deliquescing dilator external diameter volume little, like this, the medical worker just can be with reduced diameter but helix dilator that pipe range has extended is inserted the narrow positions that the patient need insert easily.The memory effect of the mat memorial alloy under people's body temperature effect of the dilator after inserting returns to clinical needed size, and produces certain power when replying, thereby narrow positions is expanded.To reach unobstructed purpose.So the dilator that adopts niti-shaped memorial alloy to make can be made overall dimensions by clinical needs, and has certain masterpiece to be used in the expansion position difficult drop-off when recovering shape.

This utility model also can be with two end coiled horn mouth shapes of serpentine pipe, can insert the pipeline position that is easy to come off, often swallow as esophagus and to be easy to make the dilator of straight tube-like to come off, after two ends turn to bell mouth shape, thereby be easy to fix because of two ends have bigger restoring force because of food.

Fig. 1 is the sketch map of straight tube-like serpentine pipe dilator.

Fig. 2 is the serpentine pipe dilator sketch map that two ends turn to bell mouth shape.

Fig. 3 is little for placing the frozen water external diameter to roll up, the dilator sketch map after the screwed pipe elongation.

This utility model has begun clinical practice behind first hospital of the lung section animal experiment of Shanghai.As case to trouble constitutional trachea scale cancer before the routine art, patient's tracheal stenosis position only is 0.5 centimeter of φ, breathing expectoration difficulty, adopt the niti-shaped memorial alloy filament winding of 1 millimeter of φ to make the helix dilator that external diameter is 14 millimeters of φ, in frozen water, be rolled into 8 millimeters of external diameter φ, after inserting, check that through fibre bronchus mirror narrow has been expanded to 1.1 centimeters of φ, it is similar to soft tissue that dilator is close to tracheal wall, and patient's postoperative is breathed unobstructed, no expectoration, expectoration difficulty.Patient's postoperative changes the radioactivity smelting over to and treats.Because this dilator is prepended to the serpentine pipe that is rolled into 8 millimeters of external diameter φ in the frozen water so insert conveniently in operation, also is difficult for leading to complications.

This utility model can be used to expand because of human pipeline's narrow positions pernicious or that benign lesion causes, and because of utilizing the shape memory effect of niti-shaped memorial alloy, so this utility model operation inserts conveniently, and expansion effectively and difficult drop-off.

Claims

1, a kind of niti-shaped memorial alloy dilator is characterized in that, adopts the niti-shaped memorial alloy filament winding to make helix, and the overall dimensions of serpentine pipe is decided according to clinical needs.

2, dilator as claimed in claim 1 is characterized in that, said serpentine pipe two ends turn to bell mouth shape.