Adaptive structure for taking out stent in blood vessel cavity

Abstract

The invention relates to an adaptive vascular intracavity stent taking-out structure applied to the technical field of medical instruments, and the adaptive vascular intracavity stent taking-out structure comprises a taking-out pocket frame, a taking-out pipe, a suction pipe, a telescopic rib, a suction elastic frame, a supporting rib, a bite needle and barbs. The sucking pipe is contracted to drive the sucking elastic frame to push the thrombus to the taking-out pocket frame, the taking-out pocket frame and the sucking elastic frame respectively wrap the two ends of the thrombus, and therefore the thrombus is wrapped, the thrombus is conveniently taken out, and when the sucking elastic frame pushes the thrombus, the thrombus can be conveniently taken out by repeatedly conducting telescopic changes of the telescopic rib. The closed end of the suction elastic frame is driven to stretch and deform, the bite needle is repeatedly inserted into and pulled out of the thrombus, in the bite needle pulling-out process, the bite needle is matched with the barbs to bite and break the thrombus, and therefore the caked thrombus can be more finely broken, the thrombus can be conveniently sucked out through the suction pipe, and the thrombus taking-out effect is further effectively improved.

Description

Technical Field

[0001] The present invention relates to a stent removal structure, and in particular to an adaptive intravascular stent removal structure applied in the technical field of medical devices. Background Art

[0002] A thrombus stent is a medical device placed in a narrowed blood vessel to support the blood vessel wall and keep the blood vessel open. In some cases, such as re-stenosis or thrombosis, the stent may need to be removed, and new technologies such as cerebrovascular embolism stent thrombectomy have emerged. These technologies allow doctors to enter the occluded part of the blood vessel through a microcatheter and microguidewire, and use a special thrombectomy stent to remove the thrombus.

[0003] The specification of Chinese invention patent CN202010353932.X discloses "An adjustable thrombus removal device and its manufacturing method", which includes a main stent, an adjustable stent, a push tube, a push wire and a handle. The thrombus can be fixed between the main stent and the adjustable stent by moving the adjustable stent, and cooperates with the rod-shaped closed structure at one end of the main stent to achieve the effect of reducing the occurrence of thrombus escape during the thrombus removal process.

[0004] Most of the existing thrombus removal stents use the stent wrapping method to remove the thrombus, but this wrapping method is only suitable for shorter thrombi. It cannot completely wrap longer thrombi, which may easily cause the omission of part of the thrombus. Therefore, the existing thrombus removal stent is equipped with a thrombus negative pressure suction structure, which uses the negative pressure suction structure to absorb part of the thrombus before the stent wraps the thrombus. However, the accumulated thrombus is prone to agglomeration, and a large amount of thrombus is directly filled into the negative pressure suction structure. The thrombus is easy to block the negative pressure suction structure, affecting the suction of the thrombus by the negative pressure suction structure. Summary of the invention

[0005] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is that the accumulated thrombus is prone to agglomeration, and a large amount of thrombus is directly filled into the negative pressure suction structure, the thrombus is easy to block the negative pressure suction structure, affecting the suction of the thrombus by the negative pressure suction structure.

[0006] To solve the above problems, the present invention provides an adaptive intravascular stent removal structure, including a removal bag rack, which is cylindrical and one end of the removal bag rack is closed, the closed end of the removal bag rack is fixedly connected with a removal tube, the interior of the removal tube is sleeved with a suction tube, the interior of the suction tube is movably connected with a telescopic rib, the front end of the telescopic rib is fixedly connected with a suction spring rack, the open end of the suction spring rack corresponds to the open end of the removal bag rack, the suction spring rack is conically arranged, and the suction spring rack covers the front end of the suction tube, the open end of the suction spring rack and the front end of the suction tube are fixedly connected with a supporting rib, the inner surface of the suction spring rack corresponds to the external contact of the supporting rib, the interior of the suction spring rack is fixedly connected with a biting needle, and the outer surface of the biting needle is fixedly connected with a barb.

[0007] In the above-mentioned adaptive intraluminal stent removal structure, the removal bag frame and the suction bomb frame are respectively arranged at the two ends of the thrombus, and the suction bomb frame is driven by contracting the suction tube to push the thrombus toward the removal bag frame. At the same time, the suction bomb frame is telescopically deformed by the telescopic tendons, and the thrombus is torn and broken by the biting needle and the barbs, which facilitates the suction tube to suck out the thrombus, effectively improving the thrombus removal effect.

[0008] As a further improvement of the present application, the material of the removal bag holder and the suction bullet holder is any one of platinum-iridium alloy, platinum-tungsten alloy, tungsten alloy or tantalum alloy, and the bite needle is made of titanium alloy material, which is convenient for the development and identification of the removal bag holder and the suction bullet holder, thereby facilitating the surgeon's in vitro operation, and improving the structural strength of the bite needle, effectively preventing the bite needle from breaking inside the blood vessel.

[0009] As a further improvement of the present application, the surface of the support rib is fixedly connected with a resisting branch, which is arranged in a Y shape. The resisting branch is utilized to enhance the restriction of the support rib on the thrombus, thereby preventing the thrombus from excessively extending into the suction bomb frame, thereby effectively avoiding affecting the suction of the thrombus.

[0010] As a further improvement of the present application, a suction port is opened between the front end of the suction tube and the root of the corresponding supporting rib, and the front end of the telescopic rib is fixedly connected to the outside with a spiral leaf. By opening the suction port, the suction space of the suction tube is effectively increased, and the rotation of the telescopic rib drives the spiral leaf, effectively improving the transmission efficiency of the thrombus.

[0011] As another improvement of the present application, the open end of the removal bag rack is fixedly connected with a merging guide rib, which extends outward from the open end of the removal bag rack in an arc shape. The merging guide rib is utilized to guide the open end of the suction bomb rack to merge with the open end of the removal bag rack to wrap the remaining thrombus, making it convenient for the thrombus to be taken out of the body along with the stent.

[0012] As another improvement supplement of the present application, the merged guide ribs are parallel to the support ribs, and both the merged guide ribs and the support ribs are made of spring steel wire. The elasticity of the merged guide ribs and the support ribs is utilized to support the opening end of the bomb suction rack and the opening end of the removal bag rack accordingly, thereby effectively improving the expansion stability effect of the opening end of the bomb suction rack and the opening end of the removal bag rack.

[0013] As another improvement supplement of the present application, the outer ends of the combined guide bars are fixedly connected with a ring, and the ring is sleeved with the suction tube. The combined guide bars are closed by using the ring, which effectively improves the movable connection effect between the combined guide bars and the suction tube.

[0014] As another improvement supplement of the present application, a groove is provided at one end of the ring, and the groove corresponds to the root of the supporting rib. The interior of the groove is arranged in an Ω shape. After the bomb suction rack and the removal bag rack are combined, the engagement of the groove and the supporting rib is utilized to effectively improve the stability effect of the combination of the bomb suction rack and the removal bag rack.

[0015] In summary, the present invention arranges the removal bag frame and the suction bomb frame into the blood vessel respectively, and drives the suction bomb frame to push the thrombus toward the removal bag frame by contracting the suction tube, so that the removal bag frame and the suction bomb frame respectively hold the two ends of the thrombus, thereby wrapping the thrombus and facilitating the removal of the thrombus. While the suction bomb frame pushes the thrombus, the closed end of the suction bomb frame is driven to perform telescopic deformation by repeatedly extending and contracting the telescopic tendons, so that the biting needle can repeatedly pierce and pull out the thrombus. In the process of pulling out the biting needle, the thrombus can be bitten and broken into pieces by cooperating with the barbs, so that the agglomerated thrombus can be made finer and the suction tube can be used to suck out the thrombus, thereby effectively improving the thrombus removal effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a three-dimensional structural diagram of the first embodiment of the present application;

[0017] Figure 2 This is a three-dimensional structural diagram of the bomb absorption rack according to the first embodiment of the present application;

[0018] Figure 3 This is a demonstration diagram of removing the bag holder and sucking out the thrombus carried by the bomb holder according to the first embodiment of the present application;

[0019] Figure 4 This is a demonstration diagram of taking out the bag holder and merging the bomb suction rack according to the first embodiment of the present application;

[0020] Figure 5 This is a three-dimensional structural diagram of the first embodiment of the present application in which the suction tube is close to the inner wall of the suction bomb rack;

[0021] Figure 6 This is a demonstration diagram of the first embodiment of the present application of biting a needle and repeatedly piercing a blood clot;

[0022] Figure 7 This is an enlarged view of the biting needle in the first embodiment of the present application;

[0023] Figure 8 This is a three-dimensional structural diagram of the bag frame taken out in the second embodiment of the present application;

[0024] Fig. 9 This is a three-dimensional structural diagram of the second embodiment of the present application in which the support rib is inserted into the groove.

[0025] Description of the numbers in the figure:

[0026] 1. Take out the bag frame; 101. Take out the tube; 102. Combine the guide ribs; 103. Ring; 104. Groove; 2. Suction spring frame; 201. Suction tube; 202. Telescopic ribs; 203. Support ribs; 204. Biting needle; 205. Barb; 206. Resistant twigs; 207. Suction mouth; 208. Spiral leaf. DETAILED DESCRIPTION

[0027] Two implementation modes of the present application are described in detail below with reference to the accompanying drawings.

[0028] The first implementation method:

[0029] Figures 1 to 5 Shown is an adaptive intraluminal stent removal structure, comprising a removal rack 1, the removal rack 1 is cylindrical, and one end of the removal rack 1 is closed, the closed end of the removal rack 1 is fixedly connected with a removal tube 101, the interior of the removal tube 101 is sleeved with a suction tube 201, the interior of the suction tube 201 is movably connected with a telescopic rib 202, the front end of the telescopic rib 202 is fixedly connected with a suction bomb rack 2, and the open end of the suction bomb rack 2 corresponds to the open end of the removal rack 1;

[0030] When performing a thrombus removal operation on a venous vessel, the removal rack 1 and the suction bomb rack 2 are respectively placed into the blood vessel by surgical implantation, and the suction tube 201 is operated to contract to drive the suction bomb rack 2 to move toward the removal rack 1, so that the removal rack 1 and the suction bomb rack 2 respectively hold the two ends of the thrombus, thereby wrapping a relatively small thrombus. The type of the suction bomb rack 2 also includes a mode in which the suction tube 201 is close to the inner wall of the suction bomb rack 2, such as Figure 5 The bomb suction rack 2 shown in the figure has an opening end that is directly fixedly connected to the suction tube 201, and the opening end of the bomb suction rack 2 is relatively inclined. Like the conventional removal bracket mode, this type of bomb suction rack 2 is easier to directly enter the removal rack 1, but the telescopic effect of the closed end of the bomb suction rack 2 is reduced. Therefore, both types of bomb suction racks 2 in the technical solution can be applied to the present removal structure, that is, the attached Figure 5 and attached Figure 2There are two types of bomb suction racks 2. The specific type of bomb suction rack 2 to be used can be selected by those skilled in the art.

[0031] Figure 2 and Figure 6 to Figure 7 As shown, the suction bomb frame 2 is set in a cone shape, and the suction bomb frame 2 covers the front end of the suction tube 201. The interior of the suction bomb frame 2 is fixedly connected with a biting needle 204, and the outer surface of the biting needle 204 is fixedly connected with a barb 205. The material of the removal bag frame 1 and the suction bomb frame 2 is any one of platinum-iridium alloy, platinum-tungsten alloy, tungsten alloy or tantalum alloy. The biting needle 204 is made of titanium alloy material, which is convenient for the development and identification of the removal bag frame 1 and the suction bomb frame 2, thereby facilitating the surgeon's in vitro operation, and improving the structural strength of the biting needle 204, effectively preventing the biting needle 204 from breaking in the blood vessel;

[0032] When the thrombus is long, the suction bomb frame 2 pushes the thrombus while repeatedly expanding and contracting the expansion tendons 202, driving the closed end of the suction bomb frame 2 to expand and contract. The conical suction bomb frame 2 expands and contracts. When the conical end of the suction bomb frame 2 recovers and contracts, the biting needle 204 inside the suction bomb frame 2 pierces into the thrombus, and then the conical end of the suction bomb frame 2 extends, driving the biting needle 204 to pull out the thrombus again. The biting needle 204 repeatedly pierces and pulls out the thrombus, and cooperates with the barbs 205 to tear and shred the thrombus, making the agglomerated thrombus more fragmented. The fragmented thrombus is held by the suction bomb frame 2, and at the same time, it is convenient for the suction tube 201 to suck out the thrombus, further effectively improving the thrombus removal effect.

[0033] Figure 2 and Fig. 9 As shown, a support rib 203 is fixedly connected between the open end of the suction bomb rack 2 and the front end of the suction tube 201, the inner surface of the suction bomb rack 2 corresponds to the external contact of the support rib 203, and a resisting twig 206 is fixedly connected to the surface of the support rib 203. The resisting twig 206 is arranged in a Y shape, and the resisting twig 206 is used to improve the restriction of the support rib 203 on the thrombus, thereby preventing the thrombus from excessively extending into the suction bomb rack 2, thereby effectively avoiding affecting the suction of the thrombus, and a suction port 207 is opened between the front end of the suction tube 201 and the root of the support rib 203, and a spiral leaf 208 is fixedly connected to the outside of the front end of the telescopic rib 202. By opening the suction port 207, the suction space of the suction tube 201 is effectively increased, and the rotation of the telescopic rib 202 drives the spiral leaf 208, which effectively improves the transmission efficiency of the thrombus;

[0034] The support ribs 203 are used to provide support for the open end of the suction bomb frame 2, so that the open end of the suction bomb frame 2 can maintain an open state, and the deformation of the conical closed end of the suction bomb frame 2 can be effectively avoided to affect the expansion state of the open end of the suction bomb frame 2, that is, the stability of the suction bomb frame 2 holding the thrombus. The resisting branches 206 on the surface of the support ribs 203 improve the restriction on the thrombus and prevent the thrombus from excessively extending into the suction bomb frame 2. The thrombus is excessively squeezed into the suction bomb frame 2, affecting the expansion and contraction of the suction bomb frame 2 and easily clogging the suction tube 201. A suction port 207 is opened on the suction tube 201 to effectively increase the suction space of the suction tube 201. The driving spiral leaves 208 are installed on the telescopic ribs 202. The telescopic ribs 202 rotate while expanding and contracting, which effectively improves the suction and transmission efficiency of the suction tube 201 for the thrombus.

[0035] The second implementation method:

[0036] Compared with the first embodiment, this embodiment mainly adds a combined guide rib 102. The specific newly added structure is as follows, and the remaining structures are consistent with the first embodiment.

[0037] Figure 1 and Figure 8 As shown, the open end of the removal bag frame 1 is fixedly connected with a merging guide rib 102, and the merging guide rib 102 extends outward from the open end of the removal bag frame 1 in an arc shape. The merging guide rib 102 is used to guide the open end of the suction bomb frame 2 to merge with the open end of the removal bag frame 1, and the remaining thrombus is wrapped, so that the thrombus is conveniently taken out of the body together with the stent. The merging guide rib 102 is parallel to the supporting rib 203, and the merging guide rib 102 and the supporting rib 203 are both made of spring steel wire. The elasticity of the merging guide rib 102 and the supporting rib 203 is used to support the open end of the suction bomb frame 2 and the open end of the removal bag frame 1, so as to effectively improve the expansion and stabilization effect of the open end of the suction bomb frame 2 and the open end of the removal bag frame 1;

[0038] The merging guide rib 102 is used to support the open end of the removal bag rack 1, effectively improving the expansion effect of the open end of the removal bag rack 1. When the suction bomb rack 2 and the removal bag rack 1 are merged, the merging guide rib 102 extends into the open end of the suction bomb rack 2, effectively preventing the open ends of the suction bomb rack 2 and the removal bag rack 1 from wrinkling during the merging process, effectively improving the wrapping effect of the suction bomb rack 2 and the removal bag rack 1 on the thrombus.

[0039] Figures 8 to 9As shown, the outer ends of the combined guide ribs 102 are fixedly connected with a collar 103, and the collar 103 is sleeved with the suction tube 201. The collar 103 is used to close the combined guide ribs 102, which effectively improves the movable connection effect between the combined guide ribs 102 and the suction tube 201. A groove 104 is provided at one end of the collar 103, and the groove 104 corresponds to the root of the support rib 203. The interior of the groove 104 is arranged in an Ω shape. After the bomb suction rack 2 and the take-out bag rack 1 are combined, the engagement of the groove 104 and the support rib 203 effectively improves the combined stability effect of the bomb suction rack 2 and the take-out bag rack 1.

[0040] During the process of merging the bomb suction rack 2 and the taking-out bag rack 1, the merging guide rib 102 extends into the bomb suction rack 2, and the merging ring 103 connected to the merging guide rib 102 contacts the root of the supporting rib 203. The ring 103 uses the groove 104 to clamp with the root of the supporting rib 203. The Ω-shaped groove 104 effectively improves the combination effect of the ring 103 and the supporting rib 203, thereby effectively improving the merging effect of the bomb suction rack 2 and the taking-out bag rack 1.

[0041] In view of current practical needs, the above-mentioned implementation mode adopted in this application is not limited to the scope of protection. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the scope of protection of the present invention.

Claims

1. An adaptive intraluminal stent removal structure, characterized in that: The invention comprises a take-out rack (1), the take-out rack (1) is cylindrical, and one end of the take-out rack (1) is closed, the closed end of the take-out rack (1) is fixedly connected to a take-out tube (101), a suction tube (201) is sleeved inside the take-out tube (101), a telescopic rib (202) is movably connected inside the suction tube (201), a front end of the telescopic rib (202) is fixedly connected to a suction bomb rack (2), the suction bomb rack (2) and the take-out rack (1), and the open end of the suction bomb rack (2) corresponds to the open end of the take-out rack (1); The bullet suction frame (2) is arranged in a conical shape, and the bullet suction frame (2) covers the front end of the suction tube (201); a support rib (203) is fixedly connected between the open end of the bullet suction frame (2) and the front end of the suction tube (201); the inner surface of the bullet suction frame (2) contacts and corresponds to the outer surface of the support rib (203); a biting pin (204) is fixedly connected to the inside of the bullet suction frame (2); and a barb (205) is fixedly connected to the outer surface of the biting pin (204).

2. The adaptive intraluminal stent removal structure according to claim 1, characterized in that: The material of the removal bag frame (1) and the bomb suction frame (2) is any one of platinum-iridium alloy, platinum-tungsten alloy, tungsten alloy or tantalum alloy, and the bite needle (204) is made of titanium alloy material.

3. The adaptive intraluminal stent removal structure according to claim 1, characterized in that: The surface of the supporting rib (203) is fixedly connected with a resisting branch (206), and the resisting branch (206) is arranged in a Y shape.

4. The adaptive intraluminal stent removal structure according to claim 1, characterized in that: A suction port (207) is provided between the front end of the suction tube (201) and the root of the corresponding support rib (203), and a spiral blade (208) is fixedly connected to the outside of the front end of the telescopic rib (202).

5. The adaptive intraluminal stent removal structure according to claim 1, characterized in that: The opening end of the taking-out bag rack (1) is fixedly connected to a combined guide rib (102), and the combined guide rib (102) extends outward from the opening end of the taking-out bag rack (1) in an arc shape.

6. The adaptive intraluminal stent removal structure according to claim 5, characterized in that: The combined guide ribs (102) correspond to the supporting ribs (203) in parallel, and both the combined guide ribs (102) and the supporting ribs (203) are made of spring steel wire.

7. The adaptive intraluminal stent removal structure according to claim 6, characterized in that: The outer ends of the combined guide ribs (102) are fixedly connected to a sleeve ring (103), and the sleeve ring (103) is sleeved with the suction tube (201).

8. The adaptive intraluminal stent removal structure according to claim 7, characterized in that: A groove (104) is provided at one end of the collar (103), the groove (104) corresponds to the root of the supporting rib (203), and the interior of the groove (104) is arranged in an Ω shape.

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