CN114733039A - Preparation method of active elbow catheter for intravascular intervention large inner cavity - Google Patents
Preparation method of active elbow catheter for intravascular intervention large inner cavity Download PDFInfo
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- CN114733039A CN114733039A CN202210248038.5A CN202210248038A CN114733039A CN 114733039 A CN114733039 A CN 114733039A CN 202210248038 A CN202210248038 A CN 202210248038A CN 114733039 A CN114733039 A CN 114733039A
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- Prior art keywords
- catheter
- compression
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- resistant protective
- resistance
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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
- A61M25/0013—Weakening parts of a catheter tubing, e.g. by making cuts in the tube or reducing thickness of a layer at one point to adjust the flexibility
-
- 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
-
- 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
- A61M25/0043—Catheters; Hollow probes characterised by structural features
- A61M25/0054—Catheters; Hollow probes characterised by structural features with regions for increasing flexibility
Abstract
The invention provides a preparation method of an intravascular interventional large-inner-cavity active elbow catheter, which comprises the following steps of: winding a high molecular organic film to form a tubular component; assembling a compression-resistant protective inner layer outside the tubular member, and fixing the compression-resistant protective inner layer to prevent looseness; laying a traction assembly outside the compression-resistant protective inner layer for controlling the bending and movement direction of the head of the catheter, wherein the traction assembly comprises a traction wire and separation ribs, and the separation ribs with different hardness degrees are selected according to different hardness requirements of different positions of the catheter; the outer side of the traction assembly is sleeved with a compression-resistant protective outer layer, and the compression-resistant protective outer layer is made of materials with different hardness degrees according to different requirements of different positions of the conduit on hardness; the high molecular organic film is wound on the outer layer of the pressure-resistant protection layer to prevent the catheter from loosening. The invention has the function of accurately controlling the pipe elbow, also has popular production process and low manufacturing cost, and is convenient to popularize and popularize.
Description
Technical Field
The invention relates to the field of medical instruments, in particular to a preparation method of an intravascular interventional large-lumen active elbow catheter.
Background
The technology of intravascular intervention is an innovative technology of modern western medicine, and is rapidly popularized and applied in China after being introduced. The endovascular interventional robot technology (including two major types, passive catheter and active catheter) is a research which is just rising in recent years, and China and western medicine are on the same starting line. The active controllable elbow catheter (also called active catheter) of the intravascular interventional robot is a field beyond and ahead of western medicine, and no western medicine reference technology exists in the specific field. In the field of endovascular interventions, there is a "paradox" that is relevant to the clinical practical needs: it is desirable that the outer diameter of the catheter be as small as possible (to reach as many tiny blood vessels as possible). In addition, the inner diameter of the catheter is required to be as large as possible, and a large amount of contrast medium and working instruments can pass through the catheter. To achieve this paradox, technologists make a great deal of effort and achieve fruitful high-tech results. For example, a controllable elbow catheter proposed in patent application CN202010217317.8 is formed by combining two-end straight thin-walled plastic tubes of various specifications, so as to achieve the effect that the finished catheter has a large inner cavity, thin walls and controllable elbows. The method is to make the wall of the plastic pipe as thin as possible on the premise of ensuring the quality safety of the plastic pipe. This involves the manufacture of highly technical precision extruded plastic pipes, which only a few companies internationally can make thin walls of extreme dimensions, forming a technical monopoly and being prohibitively expensive. The method is not suitable for cheap and good large-scale production, popularization and application, and the progress and development of the intravascular intervention active controllable elbow conduit are hindered.
The shape of the hook-shaped bend of the head of a passive catheter for intravascular intervention (namely, the traditional interventional catheter which is manually operated and is clinically applied in a large quantity at present) is made in advance, the head of the catheter cannot be actively bent and actively transversely swung at multiple points, and the root of the catheter is twisted to drive the whole catheter to rotate so as to ensure that the hook-shaped head of the catheter is aligned with the bifurcation of a blood vessel for insertion. For example, to enter an S-shaped blood vessel bifurcation, the head end hook is firstly placed at the left position for insertion, and after the head end hook rises a little, the whole catheter is turned over in reverse phase to ensure that the head end hook is inserted rightwards. Pulling and moving the whole body. Patients develop a stenosis due to the long term "garbage" accumulation of the entire vascular system, and an infarction is just a little bit more obstructed in a certain part. Therefore, the stirring and turning of the whole catheter in the blood vessel can cause the plaque 'rubbish' at the scraping part to fall off to cause new embolism, the blood vessel at the stent placing part is expanded, but the new 'rubbish' on the blood vessel wall is scraped off and new blood vessel infarction appears, and even on an operating table, the situation of the infarction in the field due to the new plaque falling off is frequent. The endovascular intervention robot adopting the passive catheter simulates the step of manually operating the passive catheter, and the servo robot controls the intervention catheter and the intervention guide wire to move forward and backward and rotate and roll in the blood vessel.
Active catheters are catheters with controllable bending of the head controlled by a servo robot. The servo robot controls the active catheter to advance and retreat in the blood vessel, can control the controllable bending of the head of the active catheter, and even can control the lateral swinging of multiple points (namely the head does not move) after the controllable bending of the head of the active catheter under the condition that the catheter body does not move. When the active catheter meets the S-shaped bifurcation, the head end of the catheter can present hook-shaped postures in different directions towards the left or the right as long as the pulling ropes with different phases are pulled, the S-shaped vessel bifurcation is easily inserted on the premise of not rotating the catheter, and the vessel wall is protected to the maximum extent. The function is beyond the reach of the passive conduit, and is a new leap. In order to realize the function of the active elbow of the catheter, a plurality of innovative technologies are developed, and the active catheter and the passive catheter are two distinct fields.
There are many techniques for achieving controlled bending of the catheter tip, as outside this particular field, but the paradoxical requirements in this field of as thin a catheter outer diameter as possible and as large a catheter lumen as possible, and the ease of large scale production and use at low production cost, create three mutually limiting factors.
Disclosure of Invention
The technical problem to be solved is as follows: aiming at the three factors which are mutually restrictive, the invention provides a manufacturing method which has the functions of accurately controlling the catheter elbow on the premise of meeting the requirement of 'paradox' of the intravascular interventional catheter, has popular production process and low manufacturing cost, and is convenient for large-area popularization and application of the intravascular interventional robot active catheter.
The technical scheme is as follows: a preparation method of an active elbow catheter for intravascular intervention large lumen comprises the following steps;
winding a high molecular organic film to form a tubular member, wherein the organic film is wound on a core rod in a superposition spiral winding mode to form the tubular member;
assembling a compression-resistant protective inner layer outside the tubular member, and fixing the compression-resistant protective inner layer to prevent looseness;
laying a traction assembly outside the compression-resistant protective inner layer for controlling the bending and movement direction of the head of the catheter, wherein the traction assembly comprises a traction wire and separation ribs, and the separation ribs with different hardness degrees are selected according to different hardness requirements of different positions of the catheter;
the outer side of the traction assembly is sleeved with a compression-resistant protective outer layer, and the compression-resistant protective outer layer is made of materials with different hardness degrees according to different requirements of different positions of the conduit on hardness;
the high molecular organic film is wound on the outer layer of the pressure-resistant protection layer to prevent the catheter from loosening.
The intravascular large-lumen active elbow catheter prepared by the preparation method.
Preferably, the catheter has a distal end connected to the catheter head and a proximal end, and has communicating lumens extending from the distal end to the proximal end, including:
a soft joint segment at the distal end of the catheter comprising at least one flexible joint segment;
a catheter support section located at the proximal end of the catheter;
the soft joint section and the catheter support section control the movement direction of the catheter head by pulling through at least one set of pulling assemblies. Preferably, the at least one flexible articular segment includes a first articular segment connected to the support segment of the conduit and a second articular segment connected to the first articular segment at the distal end of the conduit, the first articular segment and the second articular segment including a tubular member, and a soft compressive protective layer applied to the tubular member, and a pulling assembly disposed between the compressive protective layers.
Preferably, the pulling assembly comprises a first pulling wire fixed to the first joint section and a second pulling wire fixed to the second joint section, and a first separating rib fixed to the first joint section and a second separating rib fixed to the second joint section, wherein the hardness of the first separating rib is greater than that of the second separating rib, the pulling wire and the separating ribs are arranged at intervals, and the adjacent separating ribs provide a passage for the movement of the pulling wire.
Preferably, the conduit support section comprises a tubular member in axial communication with the soft joint section, and a hard compressive protective layer applied to the tubular member, and/or a pulling assembly disposed between the compressive protective layers.
Preferably, soft resistance to compression protective layer is including soft resistance to compression protection inlayer and soft resistance to compression protection skin, hard resistance to compression protective layer is including hard resistance to compression protection inlayer and hard resistance to compression protection skin, the outer elasticity of soft resistance to compression protection is greater than the outer hardness of hard resistance to compression protection. Preferably, the first separating rib is a tungsten wire, and the second separating rib is a nickel-titanium alloy wire.
Preferably, the tubular member is formed by winding a polymer organic film.
Preferably, soft resistance to compression protection inlayer and soft resistance to compression protection skin all adopt the wire spiral winding to form, hard resistance to compression protection inlayer adopts the wire winding to form, hard resistance to compression protection skin adopts the double-deck reverse spiral winding of wire to form or adopts the metal mesh grid to constitute.
Has the beneficial effects that: the intravascular interventional large-inner-cavity active elbow catheter and the preparation method thereof have the following advantages:
1. the thin-wall tubular component prepared by the method is similar to a precisely extruded plastic pipe, and the pipe wall can be made very thin, but the technical difficulty of the preparation is greatly reduced, and the cost can be greatly reduced;
2. different hardness sections are made at the position of a conduit elbow, and the soft joint section is bent under the support of the conduit support section under the action of the pulling force of the pulling wire by setting the separating ribs with different hardness degrees and the compression-resistant protective layers with different hardness degrees;
3. the adoption has two-layer resistance to compression protective layer inside and outside, resistance to compression protection inlayer is the pressure and the impact force that the big inner chamber of pipe can tolerate high pressure injection water, resistance to compression protection skin is the centre gripping and the touch of resistant operator's finger, resistance to compression protective layer at soft joint section adopts the single strand wire, resistance to compression protective layer at pipe support section adopts double-deck reverse wire or weaves the net with the wire, such arrangement has caused two kinds of resistance to compression protective layers to have different soft or hard degrees, in addition the material of separating the muscle is soft or hard different, several sections of different soft or hard degree sections have just been formed.
4. The functional sections with different hardness are made by adopting the separating ribs, the pressure-resistant protective layer is provided with a layer of metal wire winding and a layer of metal wire winding to form the difference of different hardness, and the plastic film belt is used for winding and manufacturing the pipe after adopting the measures, thereby solving the problem that the three factors of thin-wall large inner cavity and controllable pipe elbow function are mutually restricted. If the traction wires of the front joint and the rear joint are respectively pulled at three equal positions on the circumference of the catheter, the effect that the two joints of the active catheter bend towards any direction of 360 degrees in a controllable way can be realized, the front joint and the rear joint are combined in various postures, and the head of the catheter is changed into a thousand-posture and various-state bending shape, so that the catheter is suitable for the bifurcation and the bending entry of blood vessels with various shapes.
Drawings
FIG. 1 is a cross-sectional view of a catheter;
FIG. 2 is a longitudinal view of the catheter;
the reference numbers in the figures are: 1 is the tubulose component, 2 is the resistance to compression protection inlayer, 3 is the separation muscle, 4 are the wire that draws, 5 are the resistance to compression protection skin, 6 are the pipe support section, 7 are first joint section, 8 are second joint section, 9 are first wire that draws, 10 are first separation muscle, 11 are the second wire that draws, 12 are the second separation muscle, 13 are the solid fixed ring of second wire that draws, 14 are the solid fixed ring of first wire that draws.
Detailed Description
The catheter of the present invention is described in further detail below with reference to the figures and specific embodiments. Advantages and features of the present invention will become apparent from the following description and from the claims. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is provided for the purpose of facilitating and clearly illustrating embodiments of the present invention.
The invention provides a large-lumen active elbow catheter for intravascular intervention, which is suitable for interventional operations, in particular to vascular minimally invasive interventional operations;
the tubular member 1 is formed by winding a high molecular organic film, which is generally a thin plastic film, the organic film is wound on a mandrel in a superposition spiral winding mode to form the tubular member 1, in order to firmly bond the organic film, the organic film has a viscous organic film or a non-viscous organic film on one surface, and if the organic film has a viscous organic film on one surface, the non-viscous side is wound on the mandrel, so that the organic film is convenient to be peeled off from the mandrel;
assembling a compression-resistant protective inner layer 2 outside the tubular member 1, wherein the compression-resistant protective inner layer 2 is assembled on the periphery of the tubular member 1 in a spiral winding manner by adopting metal wires; the inner compression-resistant protective layer 2 needs to be capable of resisting high-pressure injection water, pressure and impact force, in order to better enable the tubular member 1 to be fixed with the inner compression-resistant protective layer, a double-faced adhesive tape or an adhesive can be adhered to the outer side of the inner compression-resistant protective layer 2, or an organic thin film layer can be directly wound on the periphery of the inner compression-resistant protective layer 2;
laying a traction assembly outside the compression-resistant protection inner layer 2 for controlling the bending and moving direction of the head of the catheter, wherein the traction assembly comprises traction wires 4 and separation ribs 3, selecting the separation ribs 3 with different hardness degrees according to different hardness requirements of different positions of the catheter, firstly laying the separation ribs 3 outside the compression-resistant protection inner layer 2, arranging gaps between the adjacent separation ribs 3, covering and fixing the separation ribs 3 by adopting a thin plastic film in order to ensure that the separation ribs 3 can be fixed outside the compression-resistant protection inner layer 2 and ensure sufficient gaps of the separation ribs, penetrating the traction wires 4 in the gaps of the separation ribs, and controlling the bending and moving direction of the head of the catheter by controlling the tensile force of the traction wires 4;
furthermore, in order to ensure different hardness requirements of different positions of the catheter, the separation ribs 3 with different hardness degrees are arranged at different position sections;
the outer compression-resistant protective layer 5 is sleeved outside the traction assembly, and the outer compression-resistant protective layer 5 is made of materials with different hardness degrees according to different requirements of different positions of the conduit on hardness; the metal wire is spirally wound in a single direction at the position where the bending amplitude of the compression-resistant protective outer layer 5 is required to be larger, and the metal wire is spirally wound in a double direction at the position where the bending amplitude of the compression-resistant protective outer layer 5 is required to be smaller or is wound by a metal wire mesh grid;
finally, a high molecular organic film is wound on the compression-resistant protective outer layer 5 to prevent the catheter from loosening.
Those skilled in the art will readily appreciate how the catheter is formed and differentiated by the stiffness and softness requirements at different locations in the embodiments set forth above, and therefore the structure of the catheter will be described with emphasis on better demonstrating the benefits of the present invention.
As shown in fig. 1, the catheter has a distal end connected to the catheter head and a proximal end, the distal and proximal ends differing in that the end distal to the operator is the distal end and the end proximal to the operator is the proximal end, and with communicating lumens extending from the distal end to the proximal end, including the following:
a soft joint segment at the distal end of the catheter, the soft joint segment being capable of active flexion and active transverse multi-point oscillation, comprising at least one flexible joint segment;
a catheter support section 6 at the proximal end of the catheter;
the soft joint section and the catheter support section 6 are pulled to control the movement direction of the catheter head by at least one set of pulling assemblies, and if the soft joint section only has one flexible joint, the movement of the flexible joint can be controlled by one set of pulling assemblies.
The at least one flexible joint section comprises a first joint section 7 connected with the catheter support section 6 and a second joint section 8 positioned at the far end of the catheter and connected with the first joint section 7, the first joint section 7 and the second joint section 8 comprise a tubular member 1, the tubular members 1 of the two joint sections are mutually communicated, the tubular member 1 is formed by spirally winding a high polymer film to form a large inner cavity of the catheter, and a soft compression-resistant protective layer applied on the tubular member 1, the soft compression-resistant protective layer comprises a soft compression-resistant protective inner layer 2 and a soft compression-resistant protective outer layer 5, the soft compression-resistant protective layers in the first joint section 7 and the second joint section 8 can be prepared by adopting the same materials and process parameters, or soft compression-resistant protective layers with different hardness degrees can be set according to different hardness requirements, and the general form of the soft compression-resistant protective layer is formed by spirally winding a metal wire, but the metal wires with different thicknesses can be limited to be wound, or the metal wires made of different materials are adopted to be wound, or the effective turns with the same thickness and the same material at the same interval are controlled, or different winding modes are adopted to achieve different soft and hard degrees of the soft compression-resistant protective layer;
in addition, a traction assembly is arranged between the inner compression-resistant protective layer 2 and the outer compression-resistant protective layer 5.
In addition, a plurality of joint sections with hardness increasing from the distal end to the proximal end can be arranged.
Preferably, the pulling assembly comprises a first pulling wire 9 fixed to the first joint section 7 and a second pulling wire 11 fixed to the second joint section 8, and a first separating rib 10 fixed to the first joint section 7 and a second separating rib 12 fixed to the second joint section 8, the first pulling wire 9 is fixed to the first joint section 7 by a first pulling wire fixing ring 14, the second pulling wire 11 is fixed to the second joint section 8 by a second pulling wire fixing ring 13,
preferably, the hardness of the first separating rib 10 is greater than that of the second separating rib 12, the traction wires 4 and the separating ribs 3 are arranged at intervals, the adjacent separating ribs 3 provide channels for the movement of the traction wires 4, the separating ribs 3 can be made of metal wire materials with different hardness, the second separating rib 12 can be made of nickel-titanium alloy wires with smaller hardness and softer hardness, and the first separating rib 10 can be made of tungsten wires with larger hardness.
Preferably, the conduit supporting section 6 comprises a tubular member 1 axially communicated with the soft joint section, and a hard compression-resistant protective layer applied on the tubular member 1, the hard compression-resistant protective layer is the same as the soft compression-resistant protective layer and is also divided into a compression-resistant protective inner layer 2 and a compression-resistant protective outer layer 5, the hard compression-resistant protective inner layer and the soft compression-resistant protective inner layer can have the same hardness degree, and the hardness of the hard compression-resistant protective inner layer can be higher than that of the soft compression-resistant protective inner layer through setting materials or different processes; the hardness of the outer layer of hard resistance to compression protective layer needs to be higher than the outer hardness of soft resistance to compression protective layer, can inject the wire of different thickness and twine, or adopt the wire of different materials to twine, or adopt the same thickness and the effective number of turns of the same interval of same material control, or adopt different winding methods, or adopt different forms of material to twine etc. and reach hard resistance to compression protective layer and possess higher hardness than soft resistance to compression protective layer.
Further, the materials with different forms are specifically adopted, the outer side of the soft compression-resistant protective layer can be formed by adopting a metal one-way spiral, and the outer layer of the hard compression-resistant protective layer is formed by adopting a metal wire double-layer reverse spiral winding or is formed by adopting a metal woven net and the like.
In addition, the conduit support section 6 may further comprise a pulling assembly placed between the pressure-resistant protective layers, and the hardness of the separating rib 3 in the pulling assembly of the conduit support section 6 may be greater than the hardness of the separating rib 3 in the soft joint section, or may be the same as the hardness of the separating rib 3 in the soft joint section.
It is preferred that the foregoing description be construed as merely illustrative of the preferred embodiments of the present invention and not limitative of the scope thereof, so that all changes and modifications that come within the meaning and range of equivalency of the claims are to be embraced therein.
Claims (10)
1. A preparation method of an intravascular interventional large-inner-cavity active elbow catheter is characterized by comprising the following steps of:
winding a high molecular organic film to form a tubular component;
assembling a compression-resistant protective inner layer outside the tubular member, and fixing the compression-resistant protective inner layer to prevent looseness;
laying a traction assembly outside the compression-resistant protective inner layer for controlling the bending and movement direction of the head of the catheter, wherein the traction assembly comprises traction wires and separation ribs, and the separation ribs with different hardness degrees are selected according to different hardness requirements of different positions of the catheter;
the outer side of the traction assembly is sleeved with a compression-resistant protective outer layer, and the compression-resistant protective outer layer is made of materials with different hardness degrees according to different requirements of different positions of the conduit on hardness;
the high molecular organic film is wound on the outer layer of the pressure-resistant protection layer to prevent the catheter from loosening.
2. The large-lumen active elbow catheter for endovascular intervention prepared by the preparation method of claim 1.
3. The active elbow catheter for endovascular access to a large lumen as defined in claim 2, having a distal end and a proximal end connected to the catheter head, and having communicating lumens extending from said distal end to said proximal end, comprising:
a soft joint segment at the distal end of the catheter comprising at least one flexible joint segment;
a catheter support section located at the proximal end of the catheter;
the soft joint section and the catheter support section control the movement direction of the catheter head by pulling through at least one set of pulling assemblies.
4. The endovascular access large lumen active elbow catheter as claimed in claim 3, wherein: the at least one flexible articular segment includes a first articular segment connected to the support segment of the conduit and a second articular segment connected to the first articular segment at the distal end of the conduit, the first articular segment and the second articular segment including a tubular member, and a soft compressive protective layer applied to the tubular member, and a pulling assembly disposed between the compressive protective layers.
5. The endovascular access large lumen active elbow catheter of claim 4, wherein: the traction assembly comprises a first traction wire fixed to the first joint section and a second traction wire fixed to the second joint section, and a first separation rib fixed to the first joint section and a second separation rib fixed to the second joint section, wherein the hardness of the first separation rib is larger than that of the second separation rib, the traction wires and the separation ribs are arranged at intervals, and a channel is provided for the movement of the traction wires by the adjacent separation ribs.
6. The endovascular access large lumen active elbow catheter of claim 4, wherein: the conduit support section includes a tubular member in axial communication with the soft articulating section, and a hard compressive protective layer applied to the tubular member, and/or a pulling assembly disposed between the compressive protective layers.
7. The endovascular access large lumen active elbow catheter as claimed in claim 6, wherein: soft resistance to compression protective layer includes soft resistance to compression protection inlayer and soft resistance to compression protection skin, hard resistance to compression protective layer includes hard resistance to compression protection inlayer and hard resistance to compression protection skin, the outer elasticity of soft resistance to compression protection is greater than the outer hardness of hard resistance to compression protection.
8. The endovascular access large lumen active elbow catheter as in claim 5, wherein: the first separating rib is a tungsten wire, and the second separating rib is a nickel-titanium alloy wire.
9. The endovascular access large lumen active elbow catheter as claimed in claim 5, wherein: the tubular member is formed by winding a high molecular organic film.
10. The endovascular access large lumen active elbow catheter as claimed in claim 1, wherein: soft resistance to compression protection inlayer and soft resistance to compression protection skin all adopt the wire spiral winding to form, hard resistance to compression protection inlayer adopts the wire winding to form, hard resistance to compression protection skin adopts the double-deck reverse spiral winding of wire to form or adopts the metal mesh grid to constitute.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210248038.5A CN114733039A (en) | 2022-03-14 | 2022-03-14 | Preparation method of active elbow catheter for intravascular intervention large inner cavity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210248038.5A CN114733039A (en) | 2022-03-14 | 2022-03-14 | Preparation method of active elbow catheter for intravascular intervention large inner cavity |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114733039A true CN114733039A (en) | 2022-07-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210248038.5A Withdrawn CN114733039A (en) | 2022-03-14 | 2022-03-14 | Preparation method of active elbow catheter for intravascular intervention large inner cavity |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114733039A (en) |
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2022
- 2022-03-14 CN CN202210248038.5A patent/CN114733039A/en not_active Withdrawn
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Application publication date: 20220712 |
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