Abstract

The present application relates to a preparation method for a heat-shrinkable tube. The preparation method comprises the following steps: heating a thermoplastic tube material to a high-elastic state for expansion, and then carrying out cooling molding to obtain a heat-shrinkable tube; and controlling a and b to meet the following condition: ab > 1, and controlling a pushed speed v' and a pulled speed v of the thermoplastic tube material during expansion to meet the following condition: Δs = v'/v - 1 > 1%, such that compared with the thermoplastic tube material, the prepared heat-shrinkable tube is radially expanded and axially contracted, wherein a is the ratio of the inner diameter of the heat-shrinkable tube after expansion to the inner diameter of the thermoplastic tube material before expansion, b is the ratio of the wall thickness of the heat-shrinkable tube after expansion to the wall thickness of the thermoplastic tube material before expansion, and Δs is the difference rate of a pulling speed during expansion.

IPC Classes  ?

• B29C 61/02 - Thermal shrinking

Abstract

The present application provides a hollow fiber membrane assembly and a weaving device for the hollow fiber membrane assembly. The hollow fiber membrane assembly comprises a hollow fiber membrane and a plurality of weaving yarns. The hollow fiber membrane comprises a plurality of turn-back segments, and a plurality of parallel segments extending in a weft direction. The ends in the weft direction of parallel segments adjacent in a warp direction are connected by means of one of the turn-back segments, and turn-back segments adjacent in the warp direction are located at two ends of the parallel segments in the weft direction, so that the hollow fiber membrane forms a continuous turn-back body. The plurality of weaving yarns are arranged at intervals in the warp direction, and are woven with the parallel segments.

IPC Classes  ?

• B01D 63/02 - Hollow fibre modules
• D04B 23/12 - Flat warp knitting machines with provision for incorporating unlooped wefts extending from selvedge to selvedge
• D03D 15/00 - Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used

Abstract

A hollow fiber membrane assembly, a hollow fiber membrane knitted pad and a knitting method therefor. The hollow fiber membrane knitted pad comprises a plurality of hollow fiber membranes (110) and a plurality of knitting threads (120), wherein the plurality of hollow fiber membranes (110) are sequentially arranged at intervals in an extension direction of the knitting threads (120), the hollow fiber membranes (110) are arranged in a bent shape, a bent gap is formed between every two adjacent hollow fiber membranes (110), and the distances between the gaps are the same or different; and the plurality of knitting threads (120) are arranged at intervals in the lengthwise direction of the hollow fiber membranes (110) and are respectively wound around the hollow fiber membranes (110), so that the hollow fiber membranes (110) are knitted together.

IPC Classes  ?

• A61M 1/18 - Dialysis systemsArtificial kidneysBlood oxygenators with membranes in the shape of hollow fibres
• B32B 27/02 - Layered products essentially comprising synthetic resin in the form of fibres or filaments
• B32B 27/12 - Layered products essentially comprising synthetic resin next to a fibrous or filamentary layer
• B32B 27/28 - Layered products essentially comprising synthetic resin comprising copolymers of synthetic resins not wholly covered by any one of the following subgroups
• B32B 27/30 - Layered products essentially comprising synthetic resin comprising vinyl resinLayered products essentially comprising synthetic resin comprising acrylic resin
• B32B 27/32 - Layered products essentially comprising synthetic resin comprising polyolefins
• D04C 1/02 - Braid or lace, e.g. pillow-laceProcesses for the manufacture thereof made from particular materials
• D04C 1/06 - Braid or lace serving particular purposes

Abstract

A hollow fiber membrane filament and a preparation method therefor, and an oxygenation membrane obtained by weaving hollow fiber membrane filaments. The preparation method for a hollow fiber membrane filament comprises the following steps: quantitatively feeding reinforcing filaments, a casting solution, and a cavity-forming fluid to a spinneret (10), and performing extrusion to obtain a nascent hollow fiber membrane filament, the spinneret (10) comprising a first channel (11), a second channel (12), and a third channel (13) that are successively provided from inside to outside; feeding the reinforcing filaments to the third channel (13), each reinforcing filament comprising multiple monofilaments, feeding the casting solution to the second channel (12), and feeding the cavity-forming fluid to the first channel (11); enabling the nascent hollow fiber membrane filament to be solidified and formed; immersing the solidified and formed nascent hollow fiber membrane filament in an extraction agent to remove a diluent; and performing heat treatment on the nascent hollow fiber membrane filament in which the diluent is removed.

IPC Classes  ?

• B01D 69/08 - Hollow fibre membranes
• B01D 67/00 - Processes specially adapted for manufacturing semi-permeable membranes for separation processes or apparatus

Abstract

Disclosed in the present invention are a medical tube and a preparation method therefor. The preparation method comprises the following steps: S1: performing melt blending on polyether block amide and thermoplastic polyurethane elastomer rubber to obtain a blend; and S2: performing melt extrusion on the blend obtained in step S1 by means of a single screw extruder to obtain the medical tube. The medical tube provided by the present invention has excellent toughness, strength, and biocompatibility, and can meet the clinical requirements of a medical tube in the field of interventional medical instruments.

IPC Classes  ?

• C08L 77/00 - Compositions of polyamides obtained by reactions forming a carboxylic amide link in the main chainCompositions of derivatives of such polymers
• C08L 75/04 - Polyurethanes

Abstract

Disclosed are a medical tubing and a manufacturing method thereof. The medical tubing comprises an inner polytetrafluoroethylene layer, a woven layer and an outer layer sequentially arranged in an outward direction. An adhesive layer is provided between the inner polytetrafluoroethylene layer and the woven layer and/or between the woven layer and the outer layer. In the medical tubing and the manufacturing method thereof provided in the present invention, provision of an adhesive layer between layers of a medical tubing effectively prevents separation of the layers, thereby reducing an accident rate relating to usage of the medical tubing, and enhancing twisting control performance of the medical tubing while maintaining flexibility of thereof.

IPC Classes  ?

• B32B 27/32 - Layered products essentially comprising synthetic resin comprising polyolefins

Abstract

The present invention discloses a medical pipe material and a preparation method thereof, wherein the preparation method of the medical pipe material comprises the following steps: S1: obtaining the medical pipe material; S2: placing the medical pipe material and an isocyanate solution in a reaction kettle, and filling the reaction kettle with carbon dioxide, adjusting the temperature and pressure in the reaction kettle to make carbon dioxide in the reaction kettle be in a supercritical state, to obtain the medical pipe material with isocyanate groups after the reaction; S3: placing the medical pipe material processed in step S2 into a modified material solution to react; obtaining the coated modified medical pipe material. The invention introduces active functional groups on the surface of medical pipe materials through supercritical carbon dioxide carrying isocyanate, to make them chemically react with the functional groups in modified materials, realize the surface modification of the medical pipe material, and improve the biological performance of the medical pipe material.

IPC Classes  ?

• C08J 7/12 - Chemical modification

Abstract

Disclosed are a medical tube material and a manufacturing method therefor. The medical tube material comprises at least one layer of thermoplastic polyimide coating and at least one layer of thermosetting polyimide coating, wherein the thermoplastic polyimide coating and the thermosetting polyimide coating are arranged in a stacked manner along the radial direction of the medical tube material. By means of the medical tube material, the flexibility and ductility of a medical tube material can be improved on the basis of ensuring that the medical tube material has the required mechanical strength, such that the problem whereby a medical tube material which is too hard easily causes damage to nerve tissue and the phenomenon whereby cracks are easily generated in same can be relieved, and the torsional transmission pushing efficiency of the medical tube material during the transmission thereof can also be improved.

IPC Classes  ?

• A61L 31/10 - Macromolecular materials
• A61L 31/14 - Materials characterised by their function or physical properties
• A61L 29/00 - Materials for catheters or for coating catheters
• B32B 1/08 - Tubular products
• C08G 73/10 - PolyimidesPolyester-imidesPolyamide-imidesPolyamide acids or similar polyimide precursors
• C08L 79/08 - PolyimidesPolyester-imidesPolyamide-imidesPolyamide acids or similar polyimide precursors

Abstract

A medical tube preparation method and a medical tube prepared using same. The preparation method comprises dispersing polytetrafluoroethylene in a polyimide precursor solution, and modifying the surface of polyimide by using the polytetrafluoroethylene. On the one hand, the friction coefficient of the polyimide material is lowered, and the surface lubricity of the medical tube is improved, thereby reducing the surface resistance of the medical tube, decreasing the possibility of damage to human blood vessels during the process of introducing the medical tube into a human body, and facilitating the push of drugs or instruments into the human body; on the other hand, the difficulty in separation due to the action of the tube and a forming base during tube forming is also avoided.

IPC Classes  ?

• A61L 31/04 - Macromolecular materials
• A61L 31/06 - Macromolecular materials obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
• A61L 31/14 - Materials characterised by their function or physical properties
• A61L 31/18 - Materials at least partially X-ray or laser opaque
• B32B 1/08 - Tubular products
• C08L 79/08 - PolyimidesPolyester-imidesPolyamide-imidesPolyamide acids or similar polyimide precursors
• C08L 27/18 - Homopolymers or copolymers of tetrafluoroethene