CN209019072U

CN209019072U - A kind of more intensity multi-density sheaths

Info

Publication number: CN209019072U
Application number: CN201820497446.3U
Authority: CN
Inventors: 王震; 王成
Original assignee: Zhejiang Batai Medical Technology Co Ltd
Current assignee: Zhejiang Batai Medical Technology Co Ltd
Priority date: 2018-04-09
Filing date: 2018-04-09
Publication date: 2019-06-25
Anticipated expiration: 2028-04-09

Abstract

The utility model discloses a kind of more intensity multi-density sheaths, by distal area, body region and proximal end region composition；The distal area is made of the soft end tip that high molecular material is constituted, and the body region collectively constitutes multi-layer braided type tube type by catheter outer, conduit braiding middle layer and conduit internal layer；The conical tubing that the proximal end region is made of single material.The utility model has novel structure, excellent bending flexibility, torsion and tubing intensity, concentricity height, accurate positioning and it is long-lasting use effectively, and there is a variety of hardness and count in same tubing body, guiding is more flexible in official jargon, and use scope is extensive etc..

Description

A kind of more intensity multi-density sheaths

Technical field

The utility model relates to medical instruments technical field, specifically a kind of more intensity multi-density sheaths.

Background technique

The interventions such as lumen distention object and implantation instrument are effectively to treat and prevent human body official jargon closure and narrow medical instruments.But Lumen distention object needs good loading parent and good protection and guiding could accurately reach lesion and in its expansion or releases Safety is withdrawn after putting.

The transportation system of traditional lumen distention object by with minimally invasive or non-invasive guide function tip head welding or glue It glues on inner pipe.The risk that there is this connection type high tip head and inner tube to separate when in use, clinically also occurs The malpractice of many tip separation is complained, and FDA also discloses the case largely recalled because of such risk；Such as 2013 4 Month FDA the event recalled etc. to U.S. Cook medical treatment COOK Zilver PTX bracket for eluting medicament.In addition, traditional pipe Plastic deformation occurs for the design of the generally single material of the transportation system sheath of chamber expansion simultaneously when will appear bending in use process The phenomenon that bending.Furthermore even if the transportation system sheath of traditional lumen distention object is designed using the braiding structure of more materials, Generally there is same shore intensity and same count, so appearance bending flexibility is poor when in use, it is torsion poor and curved The problems such as bent blood vessel passability is poor.

The utility model provides a kind of sheath of novel more intensity multi-densities of one kind for lumen distention object transportation system Design, sheath have good flexibility, torsional strength and axial strength, and concentricity is high, accurate positioning and long-lasting use have Effect, and there is a variety of hardness and count in same tubing body, there is excellent lumen adaptability.

Summary of the invention

The utility model be dedicated to providing it is a kind of have high-flexibility, high torsional strength, high-axiality and a variety of hardness and A variety of density, high lumen adaptability, the loading sheath of release and the lumen distention object of accurate positioning.

The utility model use following technical scheme: a kind of sheath of more intensity multi-densities, including conduit, catheter proximal end and Distal end of catheter, the conduit are helical structure by internal layer, middle layer and outer layer composition, the middle layer, or to be cross-woven Made of network, and density becoming larger from centre to both ends.

Further, the distal end of catheter includes the end tip and developing ring；The end tip and distal end developing ring by Laser Welding in succession It connects；Distal end developing ring connects with catheter fever plastic welding.

Further, the end tip is frustum cone structure, and centre is provided with the axially extending bore being connected to the conduit, rotary table knot The bottom surface of structure and distal end developing ring weld.

Further, development ring material in distal end is metal developing material, or is the high molecular material added with developer.Example Such as: being made of pebax 6333 (80wt%) and BaSO4 (20wt%) mixing.

Further, the end tip material is pebax (35D) or TPU.

Further, the internal layer material is PTFE material, and kinds of interlayer is 304 stainless steel wires or dilval Silk, outer layer material are Nylon12 (72D).

Further, middle layer is helical structure, and the density WPI at both ends is 50-90, and intermediate density WPI is 5- 25；Or for that can be cross-woven the network of composition, both ends braided wires are that mariages overlapping mariages weaves, and intermediate position uses Monofilament is overlapped monofilament braiding.Both ends count PPI is 2-5 times of middle braid density PPI.

Further, catheter proximal end includes proximal tube, is connected to the internal layer of conduit, and integrally formed；It is cased in proximal tube Pillar is coated on the outside of proximal end developing ring, proximal tube and proximal end developing ring.

Further, proximal end developing ring is development tantalum metal material.

Further, the length of catheter proximal end is the 20% of whole sheath.

The technological merit of the utility model is high-flexibility, high-intensitive, high alignment, height release precision, and excellent lumen is suitable Ying Xing.It is the flexibility and pipe for improving sheath that multi-layer braided pipe, which provides high-intensitive and flexibility, a variety of braiding degree for sheath, Chamber adaptability.The soft end tip is connected with sheath provides excellent lumen cruising ability and safety.

Detailed description of the invention

Fig. 1 is the structural schematic diagram of the utility model embodiment；

Fig. 2 is distal end of catheter structural schematic diagram；

Fig. 3 is catheter proximal end structural schematic diagram；

Fig. 4 is spiral interlayer structure schematic diagram；

Corresponding each toponym is numbered in figure is respectively as follows: 1- distal end of catheter, the end 11-tip, the distal end 12- developing ring, 2- Conduit, 21- internal layer, 22- middle layer, 23- outer layer, 3- catheter proximal end, 31- pillar, 32- proximal tube, the proximal end 33- developing ring.

Specific embodiment

The utility model relates to a kind of more intensity mostly braiding degree sheaths.The bracket of the utility model is theoretically applied to appoint In the transportation system of what lumen distention medical instrument or individually in the conduit systems such as guiding, radiography.

The basic structure of the utility model is shown in Fig. 1, including conduit 2, catheter proximal end 3 and distal end of catheter 1, and the conduit is by interior Layer 21, middle layer 22 and outer layer 23 form, and the middle layer 22 is helical structure (spring structure, as shown in Figure 4), or to hand over The cylindrical structure that the network of fork braiding is constituted, and density becoming larger from centre to both ends.Distal end is fine and close, so that loading There is greater strength in the distal end of the body region 2 of blood vessel dilatation object, so as to the more self-confident disease by severe calcification in lumen Stove；Intermediate region braiding is sparse, so having more preferably blood vessel compatibility, passability in the lumen with complicated bend circular arc And bendability.Wherein, helical structure makes it have good flexibility and torsion.

The distal end of catheter 1 includes the end tip 11 and distal end developing ring 12；The end tip 11 and distal end developing ring 12 are by Laser Welding It connects in succession；Distal end developing ring 12 and 2 thermoplastic of conduit weld.The end tip 11 is frustum cone structure, and centre is provided with and the conduit 2 The axially extending bore of connection, the bottom surface of frustum cone structure and distal end developing ring 12 weld.To be uniformly distributed fluid bring shear stress, subtract Resistance when few intravascular guiding, while eliminating the injury of sharp borders bring blood vessel；

Developing ring 12 material in distal end is metal developing material, or is the high molecular material added with developer.For example, by Pebax 633380wt% and BaSO420wt% mixing composition.

Soft 11 material of the end tip is soft flexible polymeric material, such as pebax35D or TPU, is reduced to blood vessel The injury of internal film tissue.

21 material of internal layer is PTFE material, and 22 material of middle layer is 304 stainless steel wires or dilval silk, outer layer 23 materials are Nylon1272D.Middle layer 22 is helical structure, and the density WPI at both ends is 50-90, and intermediate density WPI is 5-25.Or middle layer 22 is that can be cross-woven the network of composition, both ends braided wires are that mariages overlapping mariages weaves, in Between position using monofilament overlapping monofilament braiding.Both ends count PPI is 2-5 times of middle braid density PPI.

Catheter proximal end 3 include proximal tube 32, be connected to the internal layer 21 of conduit the two it is integrally formed, material, structure are identical, closely It is cased with proximal end developing ring 33 in end pipe 32, is coated with pillar 31 on the outside of proximal tube 32 and proximal end developing ring 33.Pillar 31 by FEP, The equal heat-shrinkable materials of PTFE, PALLADIUM " PEBAX " are constituted, preferably " PEBAX " this material, and pyrocondensation is in 32 He of proximal tube 33 outside of proximal end developing ring, it is possible to reduce sheath is bent bring and interferes stress, eliminates harmful strain, improves the coaxial of sheath Property；Tantalum becket is compressed on heat-shrink tube, had not only strengthened the combination of pillar and proximal end ontology 32, but also improves the aobvious of sheath entirety Shadow.

The length of catheter proximal end 3 is the 20% of whole sheath, in favor of keeping balance.

Based on the above structure, sheath distal area 1 has the hardness of 35D, and body region 2 has the 80D or so of a variety of braiding degree Hardness, proximal end region 3 add the hardness with 90D or so after proximal end pillar 31.A variety of hardness keep sheath safer, effective logical Cross lumen lesion.

Claims

1. a kind of more intensity multi-density sheaths, which is characterized in that including conduit (2), catheter proximal end (3) and distal end of catheter (1), institute Conduit is stated by internal layer (21), middle layer (22) and outer layer (23) composition, the middle layer (22) is helical structure, or to intersect Network made of braiding, and density becoming larger from centre to both ends.

2. sheath according to claim 1, which is characterized in that the distal end of catheter (1) includes that the end tip (11) and distal end are aobvious Shadow ring (12)；The end tip (11) is connected with distal end developing ring (12) by laser welding；Distal end developing ring (12) and conduit (2) thermoplastic Welding.

3. sheath according to claim 2, which is characterized in that the end tip (11) is frustum cone structure, and centre is provided with and institute The axially extending bore of conduit (2) connection is stated, the bottom surface and distal end developing ring (12) of frustum cone structure are welded.

4. sheath according to claim 1, which is characterized in that middle layer (22) is helical structure, the density WPI at both ends It is 5-25 for 50-90, intermediate density WPI；Or for that can be cross-woven the network of composition, both ends braided wires are mariages overlapping Mariages weaves, and using monofilament overlapping monofilament braiding, both ends count PPI is middle braid density PPI's at intermediate position 2-5 times.

5. sheath according to claim 1, which is characterized in that catheter proximal end (3) includes proximal tube (32), in conduit Layer (21) connection, and it is integrally formed；It is cased in proximal tube (32) proximal end developing ring (33), proximal tube (32) and proximal end developing ring (33) outside is coated with pillar (31).

6. sheath according to claim 1, which is characterized in that the length of catheter proximal end (3) is the 20% of whole sheath.