Intravascular angiographic catheter

Abstract

The invention discloses an intravascular angiographic catheter which comprises an inner tube, an outer tube, a catheter seat fixedly connected with the inner tube and a sliding hard tube fixedly connected with the outer tube. The inner tube is inserted into the outer tube, a plurality of first strip-shaped grooves are formed in the front end of the inner tube, first abutting air bags are fixed in the first strip-shaped grooves, and the side wall of the inner tube is provided with a first channel, an annular inner cavity communicated with the first channel and a plurality of second channels communicated with the annular inner cavity. The number of the second channels is equal to that of the first strip-shaped grooves, the second channels and the first strip-shaped grooves are in one-to-one correspondence, each first abutting air bag communicates with one second channel, and when the first abutting air bags are full, the first abutting air bags can abut against the inner side wall of the outer pipe so that the relative positions of the first abutting air bags and the outer pipe can be locked; the near end of the inner tube is provided with scales. The angiographic catheter can be used for angiography of different body areas, and therefore the angiographic catheter has better universality.

Description

Technical Field

[0001] The present application relates to the medical field, and in particular to an intravascular angiography catheter, in particular to an adjustable intravascular angiography catheter. Background Art

[0002] The angiography catheter is a device for percutaneous angiography. Its main function is to provide a guide to allow the contrast agent to be smoothly introduced into the blood vessels to produce an angiography effect. This allows the shape of the blood vessels and the location of the lesions to be seen, thus providing an effective basis for subsequent treatment. A good catheter should have appropriate strength, excellent torsion control, visualization, flexibility, a soft tip and low surface friction, so that it has good traceability under the guidance of the guidewire.

[0003] The human body is rich in blood vessels, and the shapes of blood vessels in different areas of the body are different, so the types of angiography catheters required are also different. There are many types of angiography catheters currently, and the lengths and curvatures of various parts required clinically are different. Therefore, existing angiography catheters are often not universal. Some angiography catheters are often only suitable for angiography of blood vessels in specific areas. Therefore, they are not convenient to use and are not universal enough. Summary of the invention

[0004] Purpose of the invention: This application aims to overcome the defects of the prior art and provide an adjustable intravascular angiography catheter.

[0005] Technical solution: An angiographic catheter comprises an inner tube, an outer tube, a catheter seat fixedly connected to the inner tube, and a sliding hard tube fixedly connected to the outer tube; the inner tube is inserted into the outer tube, the front end of the inner tube has a plurality of first strip grooves, a first abutting airbag is fixed in the first strip groove, the side wall of the inner tube has a first channel, an annular inner cavity connected to the first channel, and a plurality of second channels connected to the annular inner cavity, the number of the second channels is equal to the number of the first strip grooves and the two correspond one to one, each first abutting airbag is connected to one of the second channels, the first abutting airbag is connected to the first strip groove, and the first abutting airbag is connected to the first strip groove. When the balloon is inflated, it can abut against the inner wall of the outer tube, thereby locking the relative position of the first abutting airbag and the outer tube; the catheter seat is fixedly connected to the proximal end of the inner tube, and the catheter seat has an injection joint connected to the first channel; the catheter seat is also connected to an enclosing limit plate with an arc-shaped cross-section, and the enclosing limit plate has a strip through groove, the sliding hard tube is located between the inner tube and the enclosing limit plate, the sliding hard tube has a stud passing through the strip through groove, and the stud has a locking knob for locking the relative position of the sliding hard tube and the enclosing limit plate, and the proximal end of the inner tube has a scale.

[0006] Furthermore, the outer tube also has an end tube, and the end tube has a plurality of second strip grooves, the number of the first strip grooves is equal to the number of the second strip grooves and the two correspond one to one, a second tightening airbag is fixed in the second strip groove, and the first tightening airbag is connected to a connecting tube at one end close to the end tube, a one-way valve is installed in the connecting tube, and the connecting tube and the corresponding second tightening airbag are connected by a hose, and an L-shaped tube is also connected between the connecting tube and the first tightening airbag in which it is located, and the L-shaped tube has a manual valve, and the connection point between the L-shaped tube and the connecting tube is located between the one-way valve and the hose, and the second tightening airbag can press against the inner wall of the outer tube to lock the relative position of the end tube and the outer tube.

[0007] The first abutting balloon can lock the relative position between the front end of the inner tube and the outer tube. The second abutting balloon can lock the relative position between the end tube and the outer tube. However, since the abutting balloon and the inner wall of the outer tube are pressed together by friction, under the action of a large external force, even if the second abutting balloon is in a filled state, the end tube can still be pulled toward the catheter seat.

[0008] Furthermore, the catheter seat is also connected to a side joint; and there are two studs and two locking knobs.

[0009] Furthermore, the number of the first strip-shaped grooves and the number of the second strip-shaped grooves are both 6 and are distributed in a circular shape with equal intervals.

[0010] Furthermore, the length of the strip-shaped through groove is less than or equal to 10 cm.

[0011] Furthermore, the hardness of the inner tube is greater than that of the outer tube; and the hardness of the end tube and the inner tube are equal.

[0012] Preferably, the end tubes and the inner tube are made of the same material.

[0013] Furthermore, a circular abutment ring is fixed to the distal end of the end tube.

[0014] In some embodiments, one end of the strip-shaped through slot is open.

[0015] Thereby, it is convenient to disassemble and separate the sliding hard pipe from the surrounding limiting plate.

[0016] In some embodiments, although the end of the strip through slot away from the catheter seat is not open, the surrounding limiting plate has a certain toughness, so the end of the surrounding limiting plate can be deformed to a certain extent, so that the stud can be installed in the strip through slot or detached from the strip through slot.

[0017] Furthermore, the length of the end tube is less than 1 cm.

[0018] Therefore, when the end tube is located at the flexible portion, the flexibility of the flexible portion will not be affected due to the shorter length of the end tube.

[0019] Furthermore, the abutment ring is made of polymer material.

[0020] Therefore, it has a certain elasticity and can provide a certain friction force, so that when the inner tube and the outer tube are installed, the end tube can only slide under the push of the inner tube, which makes installation more convenient.

[0021] Furthermore, the front end of the outer tube has a plurality of developing rings.

[0022] This makes it easy to develop and position the front end of the outer tube, making this operation easier.

[0023] Beneficial effects: The angiography catheter of the present application has a double-layer structure of an inner tube and an outer tube, and the position of the inner tube can be adjusted relative to the outer tube, so that the length of the portion of the outer tube that does not overlap with the inner tube at the front end can be controlled. As a result, the length of the flexible portion of the front end of the angiography catheter as a whole can be adjusted, thereby increasing the adaptability of the angiography catheter and enabling angiography of blood vessels in different areas of the human body.

[0024] In addition, the angiography catheter of the present application has an inner tube and an end tube disposed inside the outer tube, so that during intervention into the human body, the length of the flexible portion can be conveniently and appropriately increased, thereby increasing the operator's tolerance for errors and making the angiography operation more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic diagram of an angiographic catheter when the end tube abuts against the front end of the inner tube; Figure 2 for Figure 1 A magnified image of the middle A area; Figure 3 for Figure 1 Schematic cross-sectional view of ; Figure 4 for Figure 3 Enlarged view of area B; Figure 5 It is a schematic diagram of the separation of the inner tube, the outer tube and the end tube; Figure 6 for Figure 5 Enlarged view of area C in the middle; Figure 7 A schematic diagram of an angiographic catheter when there is a distance between the end tube and the front end of the inner tube; Figure 8 for Figure 7 Enlarged view of area D in the middle; Fig. 9 A schematic cross-sectional view of angiographic catheter when there is a distance between the end tube and the front end of the inner tube; Fig.10 for Fig. 9 Enlarged view of area E. DETAILED DESCRIPTION

[0026] Reference numerals: 1 outer tube; 1.1 sliding tube; 1.2 stud; 1.3 locking knob; 2 inner tube; 2.1 catheter seat; 2.2 side joint; 2.3 gas injection joint; 2.4 scale; 2.5 surrounding limit plate; 2.6 strip through groove; 3 end tube; 3.1 abutment ring; 4.1 first strip groove; 4.2 first abutting airbag; 4.3 second strip groove; 4.4 second abutting airbag; 4.5 hose; 4.6 connecting pipe; 4.7 L-shaped pipe; 4.8 second channel; 4.9 annular inner cavity; 4.10 first channel; 4.11 manual valve.

[0027] As shown in the figure, an adjustable intravascular angiography catheter comprises an inner tube 2, an outer tube 1, a catheter seat 2.1 fixedly connected to the inner tube 2, and a sliding hard tube 1.1 fixedly connected to the outer tube 1; the inner tube 2 is inserted into the outer tube 1, the front end of the inner tube 2 has a plurality of first strip grooves 4.1, a first abutting airbag 4.2 is fixed in the first strip grooves 4.1, the side wall of the inner tube 2 has a first channel 4.10, an annular cavity 4.9 connected to the first channel 4.10, and a plurality of second channels 4.8 connected to the annular cavity 4.9, the number of the second channels 4.8 is equal to the number of the first strip grooves 4.1 and the two correspond one to one, each first abutting airbag 4.2 is connected to one of the second channels 4.8, the first abutting airbag 4. 2 can abut against the inner wall of the outer tube 1 when filled, thereby locking the relative positions of the first tightening airbag 4.2 and the outer tube 1; the catheter seat 2.1 is fixedly connected to the proximal end of the inner tube 2, and the catheter seat 2.1 has an air injection joint 2.3 connected to the first channel 4.10; the catheter seat 2.1 is also connected to an enclosing limit plate 2.5 with an arc-shaped cross-section, and the enclosing limit plate 2.5 has a strip through groove 2.6, the sliding hard tube 1.1 is located between the inner tube 2 and the enclosing limit plate 2.5, the sliding hard tube 1.1 has a stud 1.2 passing through the strip through groove 2.6, and the stud 1.2 has a locking knob 1.3 for locking the relative positions of the sliding hard tube 1.1 and the enclosing limit plate 2.5, and the proximal end of the inner tube 2 has a scale 2.4. The outer tube 1 also has an end tube 3, and the end tube 3 has a plurality of second strip grooves 4.3, the number of the first strip grooves 4.1 is equal to the number of the second strip grooves 4.3 and the two correspond one to one, a second tightening airbag 4.4 is fixed in the second strip groove 4.3, and the first tightening airbag 4.2 is connected to a connecting tube 4.6 at one end close to the end tube, a one-way valve is installed in the connecting tube 4.6, and the connecting tube 4.6 and the corresponding second tightening airbag 4.4 are connected by a hose 4.5, and an L-shaped tube 4.7 is also connected between the connecting tube 4.6 and the first tightening airbag 4.2 where it is located, and a manual valve is provided at the L-shaped tube 4.7, and the connection point between the L-shaped tube 4.7 and the connecting tube 4.6 is located between the one-way valve and the hose 4.5, and the second tightening airbag 4.4 can press against the inner wall of the outer tube 1 to lock the relative position of the end tube 3 and the outer tube 1.

[0028] The catheter seat 2.1 is also connected to a side joint 2.2; the studs 1.2 and the locking knobs 1.3 are both provided with two. The number of the first strip grooves 4.1 and the second strip grooves 4.3 are both 6 and are distributed in a circular shape with equal spacing. The length of the strip through groove 2.6 is less than or equal to 10 cm. The hardness of the inner tube 2 is greater than the hardness of the outer tube 1; the hardness of the end tube 3 and the inner tube 2 are equal. The end tube 3 and the inner tube 2 are made of the same material. A circular abutment ring 3.1 is fixed to the distal end of the end tube 3.

[0029] When the angiography catheter of the present application is used, due to different body parts, the length of the part with higher flexibility at the distal end of the catheter is inconsistent. Before use, the manual valve can be opened to drain the air from the first and second abutting airbags, and then the manual valve can be closed. The end tube and the inner tube are inserted into the outer tube, and the sliding hard tube is installed between the inner tube and the surrounding limit plate, and the stud is located in the strip groove. Then, the operator can adjust the position of the end tube in the outer tube, so that the part of the outer tube that exceeds the position of the end tube has better flexibility and is convenient to bend because it only has the outer tube, so it is more suitable for the blood vessels that need angiography, and the part of the end tube to the catheter seat has a greater hardness because it has a double-layer tube of the outer tube and the inner tube, so it is more convenient to push the angiography catheter. When adjusting the position of the end tube, it is only necessary to insert the end tube and the inner tube into the outer tube. When pushing the inner tube (at this time, the first and second abutment airbags are in a deflated state, and the manual valve is closed), the end tube is always located at the front end of the inner tube (because the abutment ring has a certain friction with the inner wall of the outer tube, the end tube can only move under the push of the front end of the inner tube). After reaching the specified position (the specific length of the outer tube exceeding the end tube can be judged by the scale, that is, the length of the more flexible part of the distal end of the angiographic catheter during subsequent use), tighten the locking knob, and then inject air into the first and second abutment airbags, so that the first and second abutment airbags are filled, and the positions of the end tube, inner tube and outer tube are locked, so as to perform the interventional operation.

[0030] When the angiographic catheter of the present application is inserted into the human body, in actual operation, the length of the flexible part of the front end of the outer tube may be insufficient and need to be appropriately extended. At this time, air can be pumped out, so that the first tightening balloon is deflated (but the second tightening balloon cannot be pumped out due to the effect of the one-way valve). After pumping out the air, the locking knob is released, and the inner tube can be manually pulled to the rear end by the required distance. Then, the locking knob is tightened to inflate the first tightening balloon. At this time, the part of the outer tube that exceeds the front end of the inner tube is the part with better flexibility (although the end tube is located in the previous position, since the length of the end tube is very short, it will not affect the flexibility of the front end of the outer tube as a whole).

[0031] Although the present invention has been illustrated and described with respect to the preferred embodiments, it will be appreciated by those skilled in the art that various changes and modifications may be made to the present invention without departing from the scope of the present invention as defined by the claims.

Claims

1. An adjustable intravascular angiography catheter, characterized in that: The invention comprises an inner tube, an outer tube, a catheter seat fixedly connected to the inner tube, and a sliding hard tube fixedly connected to the outer tube; the inner tube is inserted into the outer tube, the front end of the inner tube has a plurality of first strip grooves, a first tightening airbag is fixed in the first strip groove, the side wall of the inner tube has a first channel, an annular inner cavity connected to the first channel, and a plurality of second channels connected to the annular inner cavity, the number of the second channels is equal to the number of the first strip grooves and the two correspond one to one, each first tightening airbag is connected to one of the second channels, and the first tightening airbag can be filled when it is filled The inner side wall of the outer tube is abutted to lock the relative position of the first tightening airbag and the outer tube; the catheter seat is fixedly connected to the proximal end of the inner tube, and the catheter seat has an injection joint connected to the first channel; the catheter seat is also connected to an enclosing limit plate with an arc-shaped cross-section, and the enclosing limit plate has a strip through groove, the sliding hard tube is located between the inner tube and the enclosing limit plate, the sliding hard tube has a stud passing through the strip through groove, and the stud has a locking knob for locking the relative position of the sliding hard tube and the enclosing limit plate, and the proximal end of the inner tube has a scale.

2. The adjustable intravascular angiography catheter according to claim 1, characterized in that: The outer tube also has an end tube, and the end tube has a plurality of second strip grooves, the number of the first strip grooves is equal to the number of the second strip grooves and the two correspond one to one, a second tightening airbag is fixed in the second strip groove, and the first tightening airbag is connected to a connecting tube at one end close to the end tube, a one-way valve is installed in the connecting tube, and the connecting tube and the corresponding second tightening airbag are connected by a hose, and an L-shaped tube is also connected between the connecting tube and the first tightening airbag in which it is located, and the L-shaped tube has a manual valve, and the connection point between the L-shaped tube and the connecting tube is located between the one-way valve and the hose, and the second tightening airbag can press against the inner wall of the outer tube to lock the relative position of the end tube and the outer tube.

3. The adjustable intravascular angiography catheter according to claim 1, characterized in that: The catheter seat is also connected with a side joint; the studs and locking knobs are both provided with two.

4. The adjustable intravascular angiography catheter according to claim 1, characterized in that: The number of the first strip-shaped grooves and the number of the second strip-shaped grooves are both 6 and are distributed in a circular shape with equal intervals.

5. The adjustable intravascular angiography catheter according to claim 1, characterized in that: The length of the strip-shaped through groove is less than or equal to 10 cm.

6. The adjustable intravascular angiography catheter according to claim 2, characterized in that: The hardness of the inner tube is greater than that of the outer tube; the hardness of the end tube and the inner tube are equal.

7. The adjustable intravascular angiography catheter according to claim 2, characterized in that: A circular abutment ring is fixed to the distal end of the end tube.

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