CN205698829U

CN205698829U - Novel sheath

Info

Publication number: CN205698829U
Application number: CN201620205481.4U
Authority: CN
Inventors: 宋晓波
Original assignee: Ningbo Linstant Polymer Materials Co Ltd
Current assignee: Ningbo Linstant Polymer Materials Co Ltd
Priority date: 2016-03-09
Filing date: 2016-03-09
Publication date: 2016-11-23
Anticipated expiration: 2026-03-09

Abstract

The utility model relates to a kind of novel sheath, including body, described body is made by three-layer-material, described body outer layer is nylon elastomer PEBA material layer, described body middle level is metal level, described body internal layer is polytetrafluoroethylene floor, it is nylon elastomer PEBA material layer that body uses outer layer, middle level is metal level, internal layer is the sheath that polytetrafluoroethylene floor is made, and it has good chemical stability, corrosion resistance, sealing, high lubrication non-stick and biocompatibility, simultaneously, strengthen its anti-bending strength, extend service life.

Description

Novel sheath

Technical field

The utility model relates to the novel sheath of a kind of medical field.

Background technology

Medical sheath, as the important component part of medical catheter, is the auxiliary products of all intervention operation indispensabilities.Mainly there is following several effect: the 1st, intervention carries medium；2nd, position；3rd, the protection at operation puncturing position and conveying.

Sheath can be divided into long sheath, short sheath according to its length, with short sheath as simple radiography；And treat needs according to it, also cross over a hill and process the sheath that crosses over a hill of offside lower limb, process carotid long Shuttle sheath, the arteria renalis Guiding sheath processing the arteria renalis and anti-folding sheath etc..

Sheath is typically to be described with internal diameter (ID).The internal diameter of sheath represents can be by the size of the equipment of its tube chamber, as the sheath of 5Fr is suitable for the conduit of 5Fr (French, legal system standard, 1mm=3Fr).Sheath has multiple diameter, and typical diameters is at 4-6Fr, because great majority diagnosis and ball expand conduit is suitable for this size.Placing support generally needs sheath, common iliac artery and femoral artery,superficial (SFA) more options 6-12Fr of 6-8Fr, and sustainer then needs 22-25Fr.

Sheath also has different lengths: 3-5cm, 10-12cm, 22-25cm, 30-40cm and 90-100cm.10-12cm is full-length, is suitable for the diagnosis of most of peripheral vasculars and interventional procedure, and 3-5cm is commonly used to Glucose drift.Moderate-length is then applicable to contralateral iliac artery or femoral artery and the arteria renalis.This type of sheath has preformed head or anti-twist characteristic, contributes to entering aortic bifurcation.Client may require that and disposes light tight mark at sheath end in order to develop under at fluorescence, and this is particularly important in interventional procedure, such as can confirm that the whether fully extended sheath of support before release support.Sheath the longest can complete arteria carotis and the interventional procedure of offside tibial artery.

But, traditional medical sheath typically has single material to be fabricated by, due to due to the restriction of material, easily make bending, meanwhile, homogenous material is fabricated by its chemical stability of medical sheath, corrosion resistance, sealing, high lubrication non-stick and biocompatibility be not high, it is therefore desirable to improves.

Utility model content

For the present situation of above-mentioned prior art, technical problem to be solved in the utility model is to provide one to be difficult to bending, has the novel sheath of good chemical stability, corrosion resistance, sealing, high lubrication non-stick and biocompatibility simultaneously.

For solving the problems referred to above, novel sheath provided by the utility model, including body, described body is made by three-layer-material, described body outer layer is nylon elastomer PEBA material layer, and described body middle level is metal level, and described body internal layer is polytetrafluoroethylene floor.

In order to enable preferably to improve flexing resistance and the corrosion resistance of sheath, described body middle level is wound around braiding by stainless steel wire and forms.

Compared with prior art, the utility model has the advantage of: it is nylon elastomer PEBA material layer that body uses outer layer, middle level is metal level, internal layer is the sheath that polytetrafluoroethylene floor is made, it has good chemical stability, corrosion resistance, sealing, high lubrication non-stick and biocompatibility, meanwhile, strengthen its anti-bending strength, extend service life.

Brief description

Fig. 1 is structural representation of the present utility model.

In figure: body the 1st, nylon elastomer PEBA material layer the 2nd, metal level the 3rd, polytetrafluoroethylene floor 4.

Detailed description of the invention

As shown in Figure 1, the novel sheath that the utility model is carried, including body 1, described body 1 is made by three-layer-material, described body 1 outer layer is nylon elastomer PEBA material layer 2, described body 1 middle level is metal level 3, and described body 1 internal layer is polytetrafluoroethylene floor 4, and described body 1 middle level is wound around braiding by stainless steel wire and forms.

The novel sheath that the present embodiment is provided, its body 1 outer layer is nylon elastomer PEBA material layer 2, and it is the thermoplastic elastomer (TPE) of a kind of not plasticizer-containing.Itself molecular structure is a kind of block polyetheramides polymer, there is softness, toughness big, the advantages such as coefficient of friction is low and biocompatibility is good, are widely used in medical catheter field, in terms of urological catheters, arterial duct, angiography catheter and stomach conduit etc..Pebax material has multiple hardness washability simultaneously, it is distributed from shore hardness 25D to shore hardness 74D, different hardened material can be selected according to product needed, also can same sheath proximally and distally respectively select different hardness, as passed through high rigidity Pebax material at proximal part, provide splendid promotion ability and moment of torsion for sheath；Then select soft Pebax material handling flexibly to provide at distal portions, toughness and bending property；PEBA has stronger tolerance to various chemical substances, and is difficult to by salt or sulfuric acid corrosion.It meets American Pharmacopeia VI level authentication requesting, can use various method, including gamma radiation, high steam and oxirane sterilize；Body 1 middle level uses fine stainless steel wire to be wound around braiding.Stainless steel reinforced wire ensure that sheath, under the premise of very thin wall thickness, still has stronger bending resistance and compressive property, ensure that the torsion transmission of sheath itself simultaneously.According to the needs using, nitinol alloy wire or other macromolecular material fiber-like filaments can also be selected as strengthening medium, improve the overall bend resistance of tubing, the mechanical performance such as pressure, internal layer uses polytetrafluoroethylene (PTFE) (Teflon or PTFE).PTFE is the macromolecular compound through tetrafluoroethylene polymerization, there is excellent chemical stability, corrosion resistance, sealing, high lubrication non-stick, and there is good biocompatibility, owing to internal layer PTFE material has the unrivaled smoothness of other macromolecular materials, its coefficient of friction is the 1/5 of high density polyethylene (HDPE).PTFE material is pure inert simultaneously, has very strong biocompatibility, will not cause the repulsion of body, to human body without physiological side effects, can use any Disinfection Methods.Significantly, since the modular ratio of PTFE is relatively low, being stretched or easy elongation strain during frictional resistance, limiting the application directly as various sheaths for the simple PTFE material to a certain extent, particularly tube wall is than relatively thin tube material.But the excellent properties of himself is extremely suitable for the first-selection as ultra-thin sheath inner layer material, therefore favored by numerous compound sheath manufacturers, PTFE internal layer sheath advantage is embodied in when its conduit being used as Wicresoft's interventional medicine engineering apparatus or conveyer, the unlocking resistance of therapeutic device can be reduced, improve Position location accuracy when therapeutic device discharges and controllability；Reduce the resistance of conveyer or conduit relative movement during inserting human body.

Last it is noted that above example is only in order to illustrate the technical solution of the utility model, it is not intended to limit；Although the utility model being described in detail with reference to previous embodiment, it will be understood by those of skill in the art that it still can the technical scheme described in previous embodiment be modified, or wherein portion of techniques feature is replaced on an equal basis；And these modifications or replacement, do not make the essence of appropriate technical solution depart from the spirit and scope of the utility model each embodiment technical scheme.

Claims

1. a novel sheath, including body, is characterized in that, described body is made by three-layer-material, and described body outer layer is nylon elastomer PEBA material layer, and described body middle level is metal level, and described body internal layer is polytetrafluoroethylene floor.

2. novel sheath according to claim 1 is characterized in that, described body middle level is wound around braiding by stainless steel wire and forms.