CN110180071B - Medical composite catheter metal wire layer anti-untwisting method - Google Patents
Medical composite catheter metal wire layer anti-untwisting method Download PDFInfo
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- CN110180071B CN110180071B CN201910471451.6A CN201910471451A CN110180071B CN 110180071 B CN110180071 B CN 110180071B CN 201910471451 A CN201910471451 A CN 201910471451A CN 110180071 B CN110180071 B CN 110180071B
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M25/00—Catheters; Hollow probes
- A61M25/0009—Making of catheters or other medical or surgical tubes
- A61M25/0012—Making of catheters or other medical or surgical tubes with embedded structures, e.g. coils, braids, meshes, strands or radiopaque coils
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
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- C—CHEMISTRY; METALLURGY
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- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/34—Methods of heating
- C21D1/40—Direct resistance heating
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/525—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length for wire, for rods
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Abstract
The invention relates to the field of medical instruments, in particular to a medical composite catheter metal wire layer anti-untwisting method. The technical scheme is as follows: a medical composite catheter wire layer unwinding prevention method comprises the following steps: a) manufacturing a semi-finished product of the medical composite catheter with the metal wire layer; b) loading the semi-finished product obtained in the step a) on a resistance spot welding machine; wherein, the positive and negative electrode contacts of the resistance spot welding machine respectively contact the two ends of the half-circle metal wire; c) applying pulse current to the half-circle metal wire; wherein the current value of the resistance spot welding machine is set to be 0.02 KA-0.09 KA. The invention provides a method for preventing unwinding of a metal wire layer of a medical composite catheter on the premise of keeping the original tension of a metal wire, and solves the problem that the existing composite catheter cannot achieve both unwinding prevention of the metal layer and maintenance of a tension set value.
Description
Technical Field
The invention relates to the field of medical instruments, in particular to a medical composite catheter metal wire layer anti-untwisting method.
Background
As is known, the distal end of a common medical composite catheter is provided with two layers of polymers, and other parts are provided with three layers of polymer-metal-polymer structures. As an example of a braided catheter: if the farthest end of the metal layer is not fixed, the metal layer is inevitably unscrewed after cutting, so that outer-layer macromolecules are punctured in the subsequent thermal processing process. In order to avoid scalding the inner polymer layer of the catheter, the conventional fixing mode is resistance spot welding or laser spot welding, so that the metal wires are welded at the overlapping position. This process generally requires separately preparing the mesh fabric, removing it from the support core, welding it, and fitting it over the inner layer of the catheter. The defects are mainly reflected in two aspects: firstly, the welded metal mesh is sleeved on the inner layer for the second time, the weaving tension mainly depends on the tension of the sleeved mesh, the difference between the weaving tension and the tension arranged on the weaving equipment is larger, and the tension between the wires is different, so that the mechanical performance of the catheter is influenced; secondly, the method needs to firstly pick the net, then weld and then sleeve the net, and the process is complex.
Disclosure of Invention
The invention overcomes the defects of the prior art, provides a method for preventing unwinding of a metal wire layer of a medical composite catheter on the premise of keeping the original tension of the metal wire, and solves the problem that the unwinding prevention of the metal layer of the existing composite catheter and the maintenance of the set value of the tension cannot be achieved at the same time.
In order to solve the technical problems, the invention adopts the following technical scheme:
a medical composite catheter wire layer unwinding prevention method comprises the following steps:
a) manufacturing a semi-finished product of the medical composite catheter with the metal wire layer;
b) loading the semi-finished product obtained in the step a) on a resistance spot welding machine; wherein, the positive and negative electrode contacts of the resistance spot welding machine respectively contact with the two sides of the metal layer;
c) applying a pulse current to the metal wire; wherein the current value of the resistance spot welding machine is set to be 0.02 KA-0.09 KA.
As a preferred embodiment of the present invention, after step c), the following steps are performed:
d) if the metal wire layer (1) is of a woven mesh structure, after the electrified metal wire is discolored due to annealing, rotating the medical composite catheter, enabling a positive electrode contact (2) and a negative electrode contact (2) of the resistance electric welding machine to contact the next layer of metal wire, and performing step c), circulating in such a way until all the metal wires at the pitch of the metal wire where the positive electrode contact and the negative electrode contact (2) are located are processed by the current positive electrode contact and the negative electrode contact, horizontally moving the medical composite catheter to the next pitch, and repeating the step c) until all the metal wires at the pitch are processed; the operation is circulated to move a plurality of pitches and reach the set length; if the metal wire layer is of a spring winding structure, after the half-circle metal wire to be electrified obviously changes color, horizontally moving the medical composite catheter by a screw pitch, and performing the step c); so the process is circulated to move a plurality of screw pitches.
As a preferable scheme of the invention, in the step a), when the metal wire layer is in a woven net structure, the woven nets at two ends of the semi-finished product are screwed and fixed;
when the metal wire layer is in a spring winding structure, two ends of the metal wire are bonded on the polymer inner layer of the fixed medical composite catheter by using an adhesive.
As a preferred embodiment of the present invention, in step c), the number of pulses of current is more than two.
As a preferable aspect of the present invention, in the step c), the current value of the resistance welding machine is set to 0.06 KA.
Compared with the prior art, the invention has the beneficial effects that:
1. the semi-finished product after the metal wire layer is woven is directly electrified point to generate an electric heating effect so as to achieve annealing and shaping of partial positions and inhibit unwinding. The high-frequency pulse direct current is used for supplying power to the metal silk threads in a contact mode, the silk threads can be directly fixed on the high-molecular inner layer, the net picking and covering procedures are omitted, the original weaving tension of the metal silk threads is guaranteed, the processing technology is simplified, and the production efficiency is improved. The high-frequency pulse current is mainly used for annealing the metal wire discontinuously to prevent the inner layer from being scalded by heat accumulation. Because the electrifying time is short, and the generated heat is not enough to damage the inner layer by macromolecules by electrifying a certain section of the metal wire, the conditions that the tension is changed and the operation is troublesome because the metal wire layer is taken off are correspondingly avoided.
The current value is set to 0.02 KA-0.09 KA, and the magnitude of the current is positively correlated with the sectional area of the metal wire. When the sectional area of the metal wire is larger, and the inner layer is thicker or has strong heat resistance, relatively larger current is applied to the metal wire; when the sectional area of the metal wire is small and the inner layer is thin or poor in heat resistance, a relatively small current is applied thereto.
2. The method is suitable for the metal wire layers of the woven mesh structure and the wound spring structure, and the metal wires with a plurality of screw pitches close to the distal end of the medical composite catheter only need to be uniformly electrified and annealed, so that the operation is simple.
3. After the weaving equipment finishes weaving operation, two ends of the metal woven net can be screwed and fixed, so that the effect of primary fixing is achieved. And when the metal silk thread layer is the spring winding structure, need bond the both ends of metal silk thread on the polymer inlayer of fixed medical composite catheter with the adhesive to reach preliminary fixed effect, avoid the metal silk thread not hard up, make things convenient for follow-up circular telegram annealing operation.
4. The pulse frequency of the current is more than two times to ensure that the metal wire of the electrified part can be completely annealed and shaped, ensure that the metal wire has the original tension, and reduce the temperature of the inner layer through the pulse interval.
5. When the current value of the resistance electric welding machine is set to be 0.06KA, the metal wire with the common specification can achieve the purpose of electrifying, annealing and shaping, unwinding is effectively inhibited, and heat generated during wire annealing can be prevented from damaging the inner polymer layer.
Drawings
FIG. 1 is a schematic illustration of the operation of a wire layer of a woven mesh structure;
FIG. 2 is a schematic illustration of the operation of a wire layer of a wound spring structure;
FIG. 3 is a schematic view of a wire layer of a woven mesh structure when self-locking;
fig. 4 is a schematic view of the structure of the wound spring structure when it is preliminarily fixed.
In the figure, 1-a metal wire layer, 2-positive and negative electrode contacts and 3-a polymer inner layer.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Carrying out the process
First, a metal wire layer is woven on a polymer inner layer of the medical composite catheter, and when the metal wire layer 1 is of a woven mesh structure or a wound spring structure. The end part of the metal wire layer of the woven mesh structure is naturally locked, so that the initial fixation of the end part of the metal wire is realized; the end of the metal wire of the wound spring structure is bonded to the polymer inner layer 3 of the fixed medical composite catheter by an adhesive, so that the end of the metal wire is preliminarily fixed.
And then loading the semi-finished product onto a resistance spot welding machine, wherein positive and negative electrode contacts 2 of the resistance spot welding machine are respectively contacted with two ends of a section of metal wire. Pulse current is applied to the section of the metal wire, the current value of the resistance spot welding machine is set to be 0.02 KA-0.09 KA, and the pulse number of the current is more than twice.
The positive electrode and the negative electrode only need to ensure a certain effective distance and effectively contact with the wires to establish a passage, and particularly for a catheter with high metal coverage, the electrodes are likely to contact with a plurality of metal wires, but the implementation of the patent content is not influenced.
The 0.02 KA-0.09 KA is only a reference value, and does not limit the application range of the patent, and generally, the magnitude of the current is in positive correlation with the sectional area of the metal wire. When the sectional area of the metal wire is larger, and the inner layer is thicker or has strong heat resistance, relatively larger current is applied to the metal wire; when the sectional area of the metal wire is small and the inner layer is thin or poor in heat resistance, a relatively small current is applied thereto.
The realization of the multiple pulse current can be realized by artificially applying the current for multiple times or setting the current for multiple times through equipment programs, and the purpose is to electrify the metal wire for multiple times to generate heat so as to enable the metal wire to reach the optimal annealing state and effectively avoid heat accumulation and damage to a high-molecular inner layer.
If the metal wire layer 1 is a woven mesh structure, the positive and negative electrode contacts 2 of the resistance spot welding machine contact the next layer of metal wire, and then pulse current is introduced into the metal wire. And rotating the medical composite catheter after the electrified metal wires are discolored due to annealing, and circulating the process until all the layers of the metal wires at the position are processed. And horizontally moving the medical composite catheter by one pitch, and repeating the operation until all layers of metal wires are processed at the position. So circulate to remove a plurality of pitches, then the metal silk thread of a plurality of lengths of the tip of metal silk thread layer all is by annealing design for the metal silk thread layer can keep original weaving tension.
If the metal wire layer 1 is in a spring winding structure, after the half-circle metal wire to be electrified obviously changes color, the medical composite catheter is horizontally moved by a screw pitch, and then pulse current is introduced. And circulating the process to move for a plurality of screw pitches, and welding and annealing the metal wires with certain widths at the end parts of the metal wire layer.
Example one
A medical composite catheter wire layer unwinding prevention method comprises the following steps:
a) manufacturing a semi-finished product of the medical composite catheter with the metal wire layer 1; when the metal wire layer 1 is of a woven mesh structure, the woven meshes at two ends of the semi-finished product are locked mutually; when the metal wire layer 1 is in a single-wire wound spring structure, two ends of the metal wire are bonded on the polymer inner layer 3 for fixing the medical composite catheter by using an adhesive;
b) loading the semi-finished product obtained in the step a) on a resistance spot welding machine; wherein, the positive and negative electrode contacts 2 of the resistance spot welding machine respectively contact two ends of the half-circle metal wire;
c) applying pulse current to the half-circle metal wire; wherein the current value of the resistance spot welding machine is set to be 0.06KA, and the pulse number of the current is more than twice;
d) if the metal wire layer 1 is of a woven mesh structure, after the electrified metal wire is discolored due to electrification annealing, rotating the medical composite catheter, enabling positive and negative electrode contacts 2 of the resistance spot welding machine to contact the next layer of metal wire, and performing step c), circulating in such a way until all the layers of metal wires at the position are processed, horizontally moving the medical composite catheter by a pitch, and repeating the step c) until all the layers of metal wires at the position are processed; the operation is circulated to move for a plurality of pitches;
if the metal wire layer 1 is in a spring winding structure, after the half-circle metal wire to be electrified obviously changes color, horizontally moving the medical composite catheter by a screw pitch, and performing the step c); so the process is circulated to move a plurality of screw pitches.
In the invention, the semi-finished metal wire layer 1 is directly electrified point to generate an electric heating effect so as to achieve partial annealing and shaping and inhibit unwinding. The high-frequency pulse direct current is used for supplying power to the metal silk threads in a contact mode, the silk threads can be directly fixed on the high-molecular inner layer, the net picking and covering procedures are omitted, the original weaving tension of the metal silk threads is guaranteed, the processing technology is simplified, and the production efficiency is improved. The high-frequency pulse current is mainly used for annealing the metal wire discontinuously to prevent the inner layer from being scalded by heat accumulation. The pulse current value is 0.06KA, which is the optimal value in the patent, and the pulse current value is generally suitable for catheter wires of 3F to 8F, and the application range is wide. Because the electrifying time is short, and the point-to-point is used for electrifying one section of the metal wire, the current can not damage the high polymer inner layer 3 in the specification range, and the conditions that the metal wire layer needs to be picked off to operate, so that the tension is changed and the operation is troublesome are correspondingly avoided.
The method is suitable for the metal wire layers of the woven mesh structure and the wound spring structure, and the metal wires with a plurality of screw pitches close to the distal end of the medical composite catheter only need to be uniformly electrified and annealed, so that the operation is simple.
When the current value of the resistance spot welding machine is set to be 0.06KA, the purpose of electrifying, annealing and shaping the metal wire can be achieved, unwinding is effectively inhibited, and heat generated during annealing of the wire can be prevented from damaging the inner polymer layer.
After the metal wire layer 1 with the woven net structure is woven, the ends of the metal wire net are locked mutually, and the effect of preliminary fixing is achieved. And when the metal wire layer 1 is the spring winding structure, the two ends of the metal wire are required to be bonded on the polymer inner layer 3 of the fixed medical composite catheter by using an adhesive, so that the effect of preliminary fixation is achieved, the metal wire is prevented from loosening, and the subsequent electrifying annealing operation is facilitated.
The pulse number of the current is more than two times so as to ensure that the metal wire of the electrified part can be completely annealed and shaped and ensure that the metal wire has the original weaving tension.
Example two
A medical composite catheter wire layer unwinding prevention method comprises the following steps:
a) manufacturing a semi-finished product of the medical composite catheter with the metal wire layer 1; when the metal wire layer 1 is of a woven mesh structure, the woven meshes at two ends of the semi-finished product are locked mutually; when the metal wire layer 1 is in a spring winding structure, two ends of the metal wire are bonded on the polymer inner layer 3 for fixing the medical composite catheter by using an adhesive;
b) loading the semi-finished product obtained in the step a) on a resistance spot welding machine; wherein, the positive and negative electrode contacts 2 of the resistance spot welding machine respectively contact two ends of the half-circle metal wire;
c) pulse current is conducted on the half-circle metal wire; the current value of the resistance spot welding machine is set to be 0.02KA, and the pulse number of the current is more than twice;
d) if the metal wire layer 1 is of a woven mesh structure, after the half circle of metal wires to be electrified obviously discolors, rotating the medical composite catheter, enabling positive and negative electrode contacts 2 of the resistance spot welding machine to contact the next layer of metal wires, and performing step c), circulating in such a way, moving the medical composite catheter horizontally by a pitch after all the metal wires at the position are processed, and repeating the step c) until all the metal wires at the position are processed; the operation is circulated to move for a plurality of pitches;
if the metal wire layer 1 is in a spring winding structure, after the half-circle metal wire to be electrified obviously changes color, horizontally moving the medical composite catheter by a screw pitch, and performing the step c); so the process is circulated to move a plurality of screw pitches.
In the invention, the semi-finished metal wire layer 1 is directly electrified point to generate an electric heating effect so as to achieve partial annealing and shaping and inhibit unwinding. The high-frequency pulse direct current is used for supplying power to the metal wire in a contact mode, so that the original weaving tension of the metal wire is guaranteed, net picking and sleeving procedures are omitted, the processing technology is simplified, and the production efficiency is improved. The high-frequency pulse current is mainly used for annealing the metal wire discontinuously to prevent the inner layer from being scalded by heat accumulation. The pulse current value is 0.02KA, which is a small value in the patent, and is generally suitable for a catheter wire with the current value less than 3F. And one section of the metal wire is electrified through the point-to-point pairs, so that the current cannot damage the high polymer inner layer 3 in the specification range, and the conditions of tension change and troublesome operation caused by the need of removing the metal wire layer 1 are correspondingly avoided.
The method is suitable for the metal wire layer 1 of the woven mesh structure and the wound spring structure, and is convenient to operate only by electrifying and annealing the metal wire ends of a plurality of screw pitches close to the end part of the medical composite catheter. For the metal wire layer 1 with the woven net structure, the metal wires on all layers need to be electrified and annealed during welding, so that the metal wire layer 1 is ensured to be shaped due to annealing, and the original tension during weaving is ensured.
After the metal wire layer 1 with the woven net structure is woven, the ends of the metal wire net are locked mutually, and the effect of preliminary fixing is achieved. And when the metal wire layer 1 is the spring winding structure, the two ends of the metal wire are required to be bonded on the polymer inner layer 3 of the fixed medical composite catheter by using an adhesive, so that the effect of preliminary fixation is achieved, the metal wire is prevented from loosening, and the subsequent electrifying annealing operation is facilitated.
The pulse number of the current is more than two times so as to ensure that the metal wire at the electrified part can be completely annealed and shaped and ensure that the metal wire has the original tension.
EXAMPLE III
A medical composite catheter wire layer unwinding prevention method comprises the following steps:
a) manufacturing a semi-finished product of the medical composite catheter with the metal wire layer 1; when the metal wire layer 1 is of a woven mesh structure, the woven meshes at two ends of the semi-finished product are locked mutually; when the metal wire layer 1 is in a spring winding structure, two ends of the metal wire are bonded on the polymer inner layer 3 for fixing the medical composite catheter by using an adhesive;
b) loading the semi-finished product obtained in the step a) on a resistance spot welding machine; wherein, the positive and negative electrode contacts 2 of the resistance spot welding machine respectively contact two ends of the half-circle metal wire;
c) pulse current is conducted on the half-circle metal wire; the current value of the resistance spot welding machine is set to be 0.09KA, and the pulse number of the current is more than twice;
d) if the metal wire layer 1 is of a woven mesh structure, after the electrified metal wire is discolored due to annealing, rotating the medical composite catheter, enabling positive and negative electrode contacts 2 of the resistance spot welding machine to contact the next layer of metal wire, and performing step c), circulating in such a way until all the layers of metal wires at the position are processed, horizontally moving the medical composite catheter by a pitch, and repeating the step c) until all the layers of metal wires at the position are processed; the operation is circulated to move for a plurality of pitches;
if the metal wire layer 1 is in a spring winding structure, after the half-circle metal wire to be electrified obviously changes color, horizontally moving the medical composite catheter by a screw pitch, and performing the step c); so the process is circulated to move a plurality of screw pitches.
In the invention, the semi-finished metal wire layer 1 is directly electrified point to generate an electric heating effect so as to achieve partial annealing and shaping and inhibit unwinding. The high-frequency pulse direct current is used for supplying power to the metal wire in a contact mode, so that the original weaving tension of the metal wire is guaranteed, net picking and sleeving procedures are omitted, the processing technology is simplified, and the production efficiency is improved. The high-frequency pulse current is mainly used for annealing the metal wire discontinuously to prevent the inner layer from being scalded by heat accumulation. The pulse current value is 0.09KA, which is a large value in the patent, and is generally applicable to the catheter filament above 9F. And through point-to-point current is applied to one section of the metal wire, the current cannot damage the high polymer inner layer 3 within the specification range, the condition that the mechanical property of the high polymer inner layer 3 is changed due to annealing is avoided, and the conditions that the tension is changed and the operation is troublesome due to the fact that the metal wire layer 1 needs to be taken off are correspondingly avoided.
The method is suitable for the metal wire layer 1 of the woven mesh structure and the wound spring structure, and is convenient to operate only by electrifying and annealing the metal wire ends of a plurality of screw pitches close to the end part of the medical composite catheter. For the metal wire layer 1 with the woven net structure, the metal wires on all layers need to be electrified and annealed during welding, so that the metal wire layer 1 is ensured to be shaped due to annealing, and the original tension during weaving is ensured.
After the metal wire layer 1 with the woven net structure is woven, the ends of the metal wire net are locked mutually, and the effect of preliminary fixing is achieved. And when the metal wire layer 1 is the spring winding structure, the two ends of the metal wire are required to be bonded on the polymer inner layer 3 of the fixed medical composite catheter by using an adhesive, so that the effect of preliminary fixation is achieved, the metal wire is prevented from loosening, and the subsequent electrifying annealing operation is facilitated.
The pulse number of the current is more than two times so as to ensure that the metal wire at the electrified part can be completely annealed and shaped and ensure that the metal wire has the original tension.
Claims (4)
1. A medical composite catheter metal wire layer unwinding prevention method is characterized by comprising the following steps:
a) manufacturing a semi-finished product of the medical composite catheter with the metal wire layer (1);
b) loading the semi-finished product obtained in the step a) on a resistance spot welding machine; wherein, the positive and negative electrode contacts (2) of the resistance spot welding machine are respectively contacted with two ends of one section of the metal layer;
c) applying a pulse current to the metal wire; wherein the current value of the resistance spot welding machine is set to be 0.02 KA-0.09 KA;
after step c), the following steps are performed:
d) if the metal wire layer (1) is of a woven mesh structure, after the electrified metal wire is discolored due to annealing, rotating the medical composite catheter, enabling a positive electrode contact (2) and a negative electrode contact (2) of the resistance spot welding machine to contact the next layer of metal wire, and performing step c), circulating in such a way until all the metal wires at the pitch of the metal wire where the positive electrode contact and the negative electrode contact (2) are located are processed, horizontally moving the medical composite catheter to the next pitch, and repeating the step c) until all the metal wires at the pitch are processed; the operation is circulated to move a plurality of pitches and reach the set length;
if the metal wire layer (1) is in a spring winding structure, after the electrified metal wire is obviously discolored, horizontally moving the medical composite catheter by a screw pitch, and performing the step c); the process is circulated to move a plurality of screw pitches and reach the set length.
2. The medical composite catheter wire layer unwinding prevention method according to claim 1, wherein in step a), when the wire layer (1) is of a braided net structure, braided nets at two ends of the semi-finished product are screwed and fixed;
when the metal wire layer (1) is in a single-wire wound spring structure, two ends of the metal wire are bonded on the polymer inner layer (3) for fixing the medical composite catheter by using an adhesive.
3. The medical composite catheter wire layer anti-unwinding method according to claim 1, wherein in step c), the number of pulses of current is not less than two.
4. The medical composite catheter wire layer anti-unwinding method according to any one of claims 1 to 3, wherein in step c), the current of the resistance spot welding machine is set to 0.06 KA.
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| Application Number | Priority Date | Filing Date | Title |
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| CN102068760B (en) * | 2011-01-28 | 2015-08-05 | 北京品驰医疗设备有限公司 | Implanted bioelectrode and preparation method thereof |
| US9486605B2 (en) * | 2011-07-15 | 2016-11-08 | Cook Medical Technologies Llc | Introducer sheath with braided filament securement mechanism |
| CN205586340U (en) * | 2016-02-22 | 2016-09-21 | 中国医科大学附属盛京医院 | Medical catheter of metal mesh grid adds in pipe wall |
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