CN116370030B - Thrombus taking device capable of preventing thrombus from escaping in withdrawal process - Google Patents
Thrombus taking device capable of preventing thrombus from escaping in withdrawal process Download PDFInfo
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- CN116370030B CN116370030B CN202310659528.9A CN202310659528A CN116370030B CN 116370030 B CN116370030 B CN 116370030B CN 202310659528 A CN202310659528 A CN 202310659528A CN 116370030 B CN116370030 B CN 116370030B
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- thrombus
- tube
- net
- pushing
- distal end
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- 208000007536 Thrombosis Diseases 0.000 title claims abstract description 245
- 238000000034 method Methods 0.000 title claims abstract description 16
- 230000008569 process Effects 0.000 title claims abstract description 16
- 230000009471 action Effects 0.000 claims abstract description 40
- 210000004204 blood vessel Anatomy 0.000 claims abstract description 24
- 238000006073 displacement reaction Methods 0.000 claims abstract description 23
- 230000007246 mechanism Effects 0.000 claims description 7
- 230000004323 axial length Effects 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 238000013151 thrombectomy Methods 0.000 claims 3
- 230000008602 contraction Effects 0.000 abstract description 8
- 239000003146 anticoagulant agent Substances 0.000 description 12
- 230000002537 thrombolytic effect Effects 0.000 description 12
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
Classifications
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/22—Implements for squeezing-off ulcers or the like on the inside of inner organs of the body; Implements for scraping-out cavities of body organs, e.g. bones; Calculus removers; Calculus smashing apparatus; Apparatus for removing obstructions in blood vessels, not otherwise provided for
- A61B17/221—Gripping devices in the form of loops or baskets for gripping calculi or similar types of obstructions
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/22—Implements for squeezing-off ulcers or the like on the inside of inner organs of the body; Implements for scraping-out cavities of body organs, e.g. bones; Calculus removers; Calculus smashing apparatus; Apparatus for removing obstructions in blood vessels, not otherwise provided for
- A61B2017/22094—Implements for squeezing-off ulcers or the like on the inside of inner organs of the body; Implements for scraping-out cavities of body organs, e.g. bones; Calculus removers; Calculus smashing apparatus; Apparatus for removing obstructions in blood vessels, not otherwise provided for for crossing total occlusions, i.e. piercing
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/22—Implements for squeezing-off ulcers or the like on the inside of inner organs of the body; Implements for scraping-out cavities of body organs, e.g. bones; Calculus removers; Calculus smashing apparatus; Apparatus for removing obstructions in blood vessels, not otherwise provided for
- A61B17/221—Gripping devices in the form of loops or baskets for gripping calculi or similar types of obstructions
- A61B2017/2212—Gripping devices in the form of loops or baskets for gripping calculi or similar types of obstructions having a closed distal end, e.g. a loop
Abstract
The invention discloses a thrombus removing device for preventing thrombus from escaping in a withdrawing process, which comprises a thrombus removing net with a plurality of meshes and a pushing tube, wherein the thrombus removing net is in a contracted state with radial contraction and an expanded state with radial expansion, the distal end of the pushing tube is connected with the proximal end of the thrombus removing net, the pushing tube is used for pushing the thrombus removing net into a blood vessel, withdrawing the thrombus removing net to remove the thrombus and withdrawing the thrombus removing net with thrombus into a sheath tube, one part of the sheath tube is penetrated in the blood vessel, the other part of the thrombus removing device is exposed out of the blood vessel, the thrombus removing device further comprises an action tube capable of moving relative to the pushing tube, the action tube is configured to drive the thrombus removing net to contract in the radial direction when moving relative to the pushing tube by preset displacement, and a supporting block for preventing the thrombus removing net from excessively contracting is arranged on the action tube, and at least the whole thrombus removing net is in the contracted state after the thrombus removing net is completed and before the thrombus removing net is completely withdrawn into the sheath tube.
Description
Technical Field
The invention relates to the technical field of medical instruments, in particular to a thrombus taking device for preventing thrombus from escaping in a withdrawing process.
Background
In the prior art, a thrombus taking device for taking a thrombus by using a thrombus taking net is a relatively common mechanical thrombus taking medical instrument, the thrombus taking net is also called a thrombus taking bracket, is usually in an automatic expansion state and has a shrinkage state of radial shrinkage and an expansion state of radial expansion, after the thrombus taking net is placed into a blood vessel, the thrombus taking net can automatically and radially expand so as to capture thrombus in the blood vessel in the thrombus taking net, and finally the thrombus taking net with thrombus can be taken out by withdrawing the thrombus taking net into a sheath tube.
CN107137125a discloses a thrombus removing device, in the process of thrombus removing, a thrombus removing bracket is accommodated in a catheter, the thrombus removing bracket is in a compressed state in the catheter, the catheter is placed in a thrombus position in a blood vessel, after the catheter enters the thrombus and the distal end of the catheter reaches the thrombus end, the catheter exits the thrombus, the supporting force of a guiding device keeps the thrombus removing bracket fixed at the thrombus position so as to exit the catheter in the retreating process, and the thrombus removing bracket expands along with the exiting catheter, when the thrombus removing bracket is in an expanded state, the thrombus is embedded in the thrombus and compacted and fixed, and the guiding device pulls the thrombus removing bracket, so that the thrombus removing bracket exits the blood vessel. It can be seen that, CN107137125a and the thrombus removing device in the prior art are both used for withdrawing the blood vessel in the expanded state of the thrombus removing net, i.e. the thrombus removing stent, but in practice, thrombus is not uniformly distributed in the whole thrombus removing net, and a situation that a great amount of thrombus is gathered at a certain position of the thrombus removing net to cause the radial dimension of the position to be larger can occur, so that scraping with the inner wall of the sheath tube is inevitable in the process of withdrawing the thrombus removing net, and thus, part of thrombus is extruded out of the thrombus removing net to form thrombus escape, thereby resulting in unsatisfactory thrombus removing effect.
Disclosure of Invention
The invention aims to solve the technical problems in the prior art, and provides a thrombus taking device for preventing thrombus from escaping in the withdrawal process, so as to overcome the technical defects that part of thrombus is extruded out of a thrombus taking net to form thrombus escaping in the withdrawal process of the thrombus taking net, and thus, the thrombus taking effect is not ideal.
According to the invention, there is provided a thrombus removing device for preventing thrombus from escaping during the withdrawing process, comprising a thrombus removing net with a plurality of meshes and a pushing tube, wherein the thrombus removing net is in a contracted state with radial contraction and an expanded state with radial expansion, the distal end of the pushing tube is fixedly connected with the proximal end of the thrombus removing net, the pushing tube is used for pushing the thrombus removing net into a blood vessel, withdrawing the thrombus removing net for removing the thrombus and withdrawing the thrombus removing net with the thrombus into a sheath tube, one part of the sheath tube is penetrated in the blood vessel, the other part of the sheath tube is exposed out of the blood vessel, the thrombus removing device further comprises an action tube capable of moving relative to the pushing tube, the action tube is configured to radially contract when moving along the proximal end to the distal end direction and moving relative to the pushing tube, a supporting block for preventing the thrombus removing net from excessively contracting is arranged on the action tube, and at least the whole thrombus removing net is in a contracted state after the thrombus removing net is completed and before the thrombus removing net is completely withdrawn into the sheath tube.
Further, after the action tube moves in the proximal-to-distal direction and a predetermined displacement relative to the push tube, the support block moves into abutment with and at least partially distracts the distal end of the thrombolytic mesh.
Further, the outer surface of the supporting block forms a supporting surface for supporting the thrombus taking net, and the distal end surface of the supporting block forms an acting surface for abutting against the distal end of the thrombus taking net and driving the distal end of the thrombus taking net to synchronously move.
Further, the axial length of the supporting block is larger than the aperture of the mesh of the thrombus taking net.
Further, the supporting block is an annular boss protruding out of the outer surface of the acting pipe, an annular surface of the annular boss forms a supporting surface, and an end surface of the far end of the annular boss forms an acting surface.
Further, the annular surface of the supporting block is provided with a convex supporting rib.
Further, the support rib is provided with at least two, and at least two support ribs are annularly and uniformly distributed on the annular surface of the support block, and an accommodating space for accommodating thrombus is formed between two adjacent support ribs.
Further, the pushing tube and the acting tube are hollow tubes, the acting tube is at least partially arranged in the pushing tube in a sliding mode, the acting tube penetrates through the distal end of the thrombus taking net, and the supporting block is located in the thrombus taking net.
Further, the thrombus taking device also comprises a limiting mechanism which allows the acting tube to move relative to the pushing tube by preset displacement.
Further, the limiting mechanism comprises a limiting cylinder and a limiting pull rod which are coaxially arranged and can be locked relatively, the limiting cylinder is fixedly connected with the pushing pipe, the limiting pull rod is fixedly connected with the acting pipe, and after the limiting pull rod moves for preset displacement relative to the limiting cylinder, the acting pipe moves for the same preset displacement relative to the pushing pipe.
Compared with the prior art, after the thrombus taking of the thrombus taking net is finished and before the thrombus taking net is completely retracted into the sheath tube, the thrombus taking net is configured to have at least a stage in which the whole thrombus taking net is in a contracted state, so that thrombus in the thrombus taking net is radially extruded to cause axial displacement in the whole thrombus taking net contracting process, finally, the thrombus in the thrombus taking net is relatively uniformly distributed, the radial dimension of the thrombus in the thrombus taking net is not larger due to the fact that a great amount of thrombus is gathered at a certain position of the thrombus taking net, further, thrombus is not extruded to form thrombus escape due to the fact that the thrombus is scraped between the thrombus taking net and the inner wall of the sheath tube, and a supporting block for preventing the thrombus taking net from excessively contracting is additionally arranged in the thrombus taking net so as to ensure that the thrombus taking net has a certain thrombus accommodating space in the radial contracted state.
Drawings
The invention will be more fully understood and its attendant advantages and features will be more readily understood by reference to the following detailed description, taken in conjunction with the accompanying drawings.
Fig. 1 is a schematic structural view of a thrombus removing device with a thrombus removing mesh in an expanded state and located outside a thrombus removing tube according to the first embodiment.
Fig. 2 is a partial schematic structure of fig. 1.
Fig. 3 is a schematic cross-sectional structure of fig. 2.
Fig. 4 is a schematic view of a partial structure of the action tube in fig. 3.
Fig. 5 is a schematic structural view of a thrombus removing device with a thrombus removing mesh in a contracted state and located outside a thrombus removing tube according to the first embodiment.
Fig. 6 is a schematic structural view of a thrombolytic device with a thrombolytic mesh in a contracted state and located in a thrombolytic tube according to the first embodiment.
Fig. 7 is a cross-sectional view of the support block in the second embodiment.
Fig. 8 is a schematic partial structure of the action tube in the third embodiment.
Fig. 9 is a schematic structural view of the thrombolytic mesh in the expanded state in the third embodiment.
Fig. 10 is a schematic structural view of a thrombolytic mesh in a contracted state in the third embodiment.
In the accompanying drawings: 1 is a thrombus taking pipe, 2 is a pushing pipe, 3 is an acting pipe, 4 is a thrombus taking net, 5 is a supporting block, 6 is a limiting cylinder, 7 is a limiting pull rod, 8 is a limiting pull handle, 9 is a supporting rib, 10 is an acting block, and 11 is a sliding block.
It should be noted that the drawings are for illustrating the invention and are not to be construed as limiting the invention. Note that the drawings representing structures may not be drawn to scale. Also, in the drawings, the same or similar elements are denoted by the same or similar reference numerals.
Detailed Description
In order that the invention may be more readily understood, a detailed description of the invention is provided below along with specific embodiments and accompanying figures.
The terms "proximal" and "distal" in the sense of the present invention should be understood as meaning, viewed from the direction of the attending physician, the term "proximal" referring to the end proximal to the attending physician, i.e. corresponding to the "left end" referred to with reference to the accompanying drawings, and the term "distal" referring to the end distal to the attending physician, i.e. corresponding to the "right end" referred to with reference to the accompanying drawings.
Embodiment one: the thrombus removing device of the embodiment is inserted into a blood vessel through a sheath tube to remove thrombus, one part of the sheath tube is penetrated in the blood vessel, and the other part of the sheath tube is exposed out of the blood vessel. The structure of the thrombus removing device is shown in fig. 1 to 6, the thrombus removing device comprises a thrombus removing tube 1, a pushing tube 2, an acting tube 3, a thrombus removing net 4 and a limiting mechanism, wherein the thrombus removing tube 1 is provided with a tube cavity for accommodating the pushing tube 2 and the thrombus removing net 4, the pushing tube 2 and the acting tube 3 are hollow tubes so as to facilitate the pushing of a guide wire to pass through, the acting tube 3 is at least partially arranged in the pushing tube 2 in a sliding manner, the thrombus removing net 4 is a self-expanding net and is provided with a plurality of meshes, the thrombus removing net 4 is in a radially contracted and expanded state, the proximal end of the thrombus removing net 4 is an open end, the distal end of the thrombus removing net 4 is a closed end, thrombus in a blood vessel can be cut when the thrombus removing net 4 is positioned in the blood vessel and moves from the distal end to the proximal end, the thrombus is separated from the blood vessel and collected, the proximal end of the thrombus removing net 4 is fixedly connected with the distal end of the pushing tube 2, and the thrombus removing net 4 is retracted into the blood vessel.
In this embodiment, after the thrombus removing net 4 is removed and before the thrombus removing net 4 is completely retracted into the sheath, the thrombus removing net 4 is configured to have at least a stage in which the whole body is in a contracted state, that is, the thrombus removing net 4 after the thrombus removing is completely retracted into the sheath after the whole body is in a radially contracted state, so that the thrombus removing net 4 is in a radially expanded state to separate and store thrombus in a blood vessel when the thrombus removing is completed, and the thrombus removing net 4 is in a contracted state to reduce the radial size after the thrombus removing is completed, so that the thrombus removing net 4 with thrombus can be smoothly retracted into the sheath to withdraw from the blood vessel, and in the process of the whole radial contraction of the thrombus removing net 4, the thrombus in the thrombus removing net 4 is radially extruded to cause axial displacement, so that the thrombus in the thrombus removing net 4 is relatively uniformly distributed, the radial size of the thrombus removing net 4 is not greatly aggregated at a certain position, and the thrombus is not extruded and the thrombus is not escaped from the inner wall of the sheath.
The radial contraction of the thrombus taking net 4 is realized by controlling the action tube 3, when the action tube 3 is configured to move along the proximal end to the distal end direction and move relative to the pushing tube 2 for preset displacement, the action tube 3 drives the distal end of the thrombus taking net 4 to move towards the distal end direction to be elongated so as to realize radial contraction, when the action tube 3 moves along the proximal end to the distal end direction and moves relative to the pushing tube 2 for preset displacement, the thrombus taking net 4 is in the minimum contraction state of radial contraction, the action tube 3 is provided with a supporting block 5 for preventing the thrombus taking net 4 from excessively contracting, the supporting block 5 is positioned in the thrombus taking net 4, the supporting block 5 substantially plays a supporting role for supporting the thrombus taking net 4, and a certain thrombus accommodating space can be ensured when the thrombus taking net 4 is in the radial contraction state, so that thrombus in the thrombus taking net 4 is extruded due to the fact that thrombus is escaped, and the thrombus taking is incomplete. When the acting tube 3 moves along the proximal end to the distal end direction and moves for a preset displacement relative to the pushing tube 2, the supporting block 5 moves to be abutted against the distal end of the thrombus removing net 4 and at least partially prop up the distal end of the thrombus removing net 4, specifically, the outer surface of the supporting block 5 forms a supporting surface for supporting the thrombus removing net 4, the axial length of the supporting block 5 is greater than the aperture of the mesh of the thrombus removing net 4 so as to play an effective supporting role, and the distal end surface of the supporting block 5 forms an acting surface for being abutted against the distal end of the thrombus removing net 4 and driving the distal end of the thrombus removing net 4 to synchronously move, so that the supporting block 5 plays a role of driving the thrombus removing net 4 with thrombus to retract radially so as to enable the thrombus removing net 4 to retract into the sheath tube smoothly, and plays a role of ensuring that the thrombus removing net 4 has a certain thrombus accommodating space in a radially contracted state, and finally, the phenomenon of thrombus escaping in the thrombus removing net 4 is effectively prevented. Specifically, the supporting block 5 is an annular boss protruding from the outer surface of the acting tube 3, the annular boss and the acting tube 3 are separately fixed or integrally arranged, an annular surface of the annular boss forms a supporting surface, and an end surface of the distal end of the annular boss forms an acting surface, so that the acting surface of the supporting block 5 can conveniently move to be abutted with the distal end of the thrombus taking net 4 to drive the distal end of the thrombus taking net 4 to move towards the distal end, and the acting tube 3 penetrates through the distal end of the thrombus taking net 4 to be arranged, namely, whether the thrombus taking net 4 is in a radial shrinkage state or a radial expansion state, and the distal end of the thrombus taking net 4 is always sleeved on the acting tube 3 and can move relative to the acting tube 3.
The limiting mechanism is arranged between the pushing tube 2 and the acting tube 3 and allows the acting tube 3 to move relative to the pushing tube 2 by a preset displacement, after the acting tube 3 moves relative to the pushing tube 2 from the proximal end to the distal end by the preset displacement, the thrombus taking net 4 is in a minimum shrinkage state of radial shrinkage, and at the moment, if the acting tube 3 moves relative to the pushing tube 2 from the distal end to the proximal end by the preset displacement, the thrombus taking net 4 is restored to an expansion state, either through self elasticity or through external acting force. The limiting mechanism comprises a limiting cylinder 6 and a limiting pull rod 7 which are coaxially arranged and can be locked relatively, wherein the limiting pull rod 7 is fixedly clamped with the limiting cylinder 6 in a rotating way, specifically, a limiting clamping block which is clamped with the limiting cylinder 6 and a reset spring which is used for driving the limiting pull rod 7 to reset after the limiting clamping block is separated from the limiting cylinder 6 are arranged on the limiting pull rod 7, and after the limiting pull rod 7 moves relative to the limiting cylinder 6 for preset displacement and rotates relative to the limiting cylinder 6 by a certain angle, the limiting clamping block on the limiting pull rod 7 is just clamped with the limiting cylinder 6, so that the limiting pull rod 7 is locked on the limiting cylinder 6. The distal end of the limiting cylinder 6 is fixedly connected with the proximal end of the pushing tube 2, the distal end of the limiting pull rod 7 is fixedly connected with the proximal end of the acting tube 3, after the limiting pull rod 7 moves for preset displacement relative to the limiting cylinder 6, the acting tube 3 moves for the same preset displacement relative to the pushing tube 2, so that the acting tube 3 is driven to move relative to the pushing tube 2, and in order to avoid the situation that the thrombus taking net 4 is twisted into a group along with the rotation caused by the rotation of the limiting pull rod 7 in the rotating and clamping process, the distal end of the thrombus taking net 4 is always sleeved on the acting tube 3 and can move relative to the acting tube 3, and simultaneously the distal end of the thrombus taking net 4 is allowed to rotate relative to the acting tube 3, namely, the distal end of the thrombus taking net 4 can move and rotate relative to the acting tube 3. In order to facilitate pulling of the limit pull rod 7, a limit pull handle 8 is fixedly connected to the distal end of the limit pull rod 7, namely, the end far away from the acting tube 3.
Embodiment two: unlike the first embodiment, as shown in fig. 7, the annular surface of the supporting block 5 of the present embodiment is provided with protruding supporting ribs 9, the supporting ribs 9 are provided with at least two supporting ribs 9, the supporting ribs 9 of the present embodiment are provided with six supporting ribs, the six supporting ribs 9 are annularly and uniformly distributed on the annular surface of the supporting block 5, and an accommodating space for accommodating thrombus is formed between the two adjacent supporting ribs 9, the supporting ribs 9 further play a role of supporting the thrombus taking net 4 on one hand, so that the thrombus accommodating space inside the thrombus taking net 4 is prevented from being too small in a contracted state, and on the other hand, the thrombus accommodating space inside the thrombus taking net 4 in a contracted state is increased to a certain extent through the formed accommodating space. The support ribs 9 and the support blocks 5 in this embodiment are integrally formed, but may be fixedly connected in a split manner, and two or three or the like may be provided in number.
Other structures of this embodiment are identical to those of the embodiment, and are not described herein.
Embodiment III: in contrast to the embodiment, as shown in fig. 8 to 10, the action tube 3 of the present embodiment is fixedly connected with the action block 10, that is, the action tube 3 is connected with the action block 10 after penetrating through the distal end of the thrombolytic net 4, so that the action block 10 and the support block 5 are spaced, and the action block 10 is located outside the thrombolytic net 4, so that the distal end of the thrombolytic net 4 is located between the support block 5 and the action block 10 and can slide within a range of spacing defined between the support block 5 and the action block 10, the distal end of the thrombolytic net 4 is fixedly connected with the slider 11 and is retracted to form a retracted end, the slider 11 is sleeved on the action tube 3 and is configured to slide within a range of spacing of the action tube 3 defined between the support block 5 and the action block 10, and is also configured to rotate relative to the action tube 3, and therefore, when the action tube 3 is configured to move in a predetermined direction and generate relative displacement with the pushing tube 2, the thrombolytic net 4 is driven to radially contract by the support block 5 or drive the thrombolytic net 4 to radially expand by the action block 10, that is driven by the action block 10, compared to the embodiment, the embodiment is realized by the action block 10 that the action net 4 is radially expanded by the action net 4.
In actual operation, as shown in fig. 10, when the acting tube 3 is pulled in a distal and proximal direction and relatively displaced with the pushing tube 2, the slide block 11 can be driven by the acting block 10 to slide in the proximal direction so as to shorten the thrombus removing net 4 for radial expansion, and after the acting tube 3 moves from the distal end to the proximal end relative to the pushing tube 2 for preset displacement, the thrombus removing net 4 is in a maximum expansion state of radial expansion as shown in fig. 9, then the pushing tube 2 and the acting tube 3 are synchronously pulled in the distal and proximal directions to withdraw the thrombus removing net 4 for thrombus removing, and the distal end of the thrombus removing net 4 can also move relative to the acting tube 3 towards the supporting block 5 for further expansion in the thrombus removing process, after the thrombus removing net 4 enters the sheath tube from the proximal end, the acting tube 3 is pushed in the proximal and relatively displaced with the pushing tube 2 in the distal direction, the action tube 3 can drive the sliding block 11 to slide towards the distal direction through the supporting block 5 so that the thrombus removing net 4 is lengthened to shrink into a figure 10 along the radial direction, after the action tube 3 moves from the proximal end to the distal end relative to the pushing tube 2 for preset displacement, the thrombus removing net 4 is in a minimum shrinkage state of radial shrinkage, finally the pushing tube 2 and the action tube 3 are synchronously pulled along the distal end to the proximal end direction to retract the thrombus removing net 4 into the sheath tube to withdraw from a blood vessel, the distal end of the thrombus removing net 4 can also move towards the action block 10 relative to the action tube 3 to shrink further in the process, therefore, the distal end position of the thrombus removing net 4 is not completely limited, dynamic adjustment can be carried out along with the conditions such as thrombus volume in the thrombus removing net 4, so that thrombus is beneficial to realizing uniform distribution in the automatic adjustment position in the thrombus removing net 4, and thus, the thrombus removing effect is improved.
Other structures of this embodiment are identical to those of the embodiment, and are not described herein.
It will be appreciated that although the invention has been described above in terms of preferred embodiments, the above embodiments are not intended to limit the invention. Many possible variations and modifications of the disclosed technology can be made by anyone skilled in the art without departing from the scope of the technology, or the technology can be modified to be equivalent. Therefore, any simple modification, equivalent variation and modification of the above embodiments according to the technical substance of the present invention still fall within the scope of the technical solution of the present invention.
Claims (8)
1. A thrombus taking device for preventing thrombus from escaping in a withdrawing process, which comprises a thrombus taking net (4) with a plurality of meshes and a pushing tube (2), wherein the thrombus taking net (4) is provided with a contracted state which is contracted in a radial direction and an expanded state which is expanded in a radial direction, the distal end of the pushing tube (2) is fixedly connected with the proximal end of the thrombus taking net (4), the pushing tube (2) is used for pushing the thrombus taking net (4) into a blood vessel, withdrawing the thrombus taking net (4) for thrombus taking and withdrawing the thrombus taking net (4) with thrombus into a sheath tube, one part of the sheath tube is penetrated in the blood vessel, the other part of the sheath tube is exposed out of the blood vessel, the thrombus taking device is characterized in that the thrombus taking device also comprises an acting tube (3) which can move relative to the pushing tube (2), a supporting block (5) which is used for preventing the thrombus taking net (4) from being excessively contracted, the acting tube (3) is configured to move in a distal direction and drive the thrombus taking net (4) to move in a preset displacement relative to the pushing tube (2) along the proximal end, one part of the supporting block is contracted in a radial direction, and the supporting block (5) is used for driving the supporting block (4) to move against at least one of the distal end (4) to form a supporting surface which is contacted with the distal end (4) of the supporting block (4) which is contacted with the distal end (5), after the end of the thrombus removal net (4) and before the thrombus removal net (4) is completely retracted into the sheath, the thrombus removal net (4) has at least a stage of being in a whole contracted state.
2. The thrombectomy device according to claim 1, wherein the axial length of the support block (5) is greater than the mesh aperture of the thrombectomy mesh (4).
3. The thrombus removal device according to claim 1, wherein the support block (5) is an annular boss protruding from the outer surface of the action tube (3), the annular face of the annular boss forming the support face, and the end face of the distal end of the annular boss forming the action face.
4. A thrombus removal device according to claim 3, wherein the annular surface of the support block (5) is provided with protruding support ribs (9).
5. The thrombus taking device according to claim 4, wherein the number of the supporting ribs (9) is at least two, the at least two supporting ribs (9) are annularly and uniformly distributed on the annular surface of the supporting block (5), and an accommodating space for accommodating thrombus is formed between the two adjacent supporting ribs (9).
6. The thrombus removal device according to claim 1, wherein the pushing tube (2) and the acting tube (3) are hollow tubes, the acting tube (3) is at least partially slidably arranged in the pushing tube (2), the acting tube (3) is arranged penetrating through the distal end of the thrombus removal net (4), and the supporting block (5) is arranged in the thrombus removal net (4).
7. The thrombectomy device according to claim 6, further comprising a limiting mechanism allowing the action tube (3) to move a preset displacement with respect to the pusher tube (2).
8. The thrombus taking device according to claim 7, wherein the limiting mechanism comprises a limiting cylinder (6) and a limiting pull rod (7) which are coaxially arranged and can be locked relatively, the limiting cylinder (6) is fixedly connected with the pushing tube (2), the limiting pull rod (7) is fixedly connected with the acting tube (3), and after the limiting pull rod (7) moves for a preset displacement relative to the limiting cylinder (6), the acting tube (3) moves for the same preset displacement relative to the pushing tube (2).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2022115529313 | 2022-12-06 | ||
| CN202211552931 | 2022-12-06 |
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| CN116370030A CN116370030A (en) | 2023-07-04 |
| CN116370030B true CN116370030B (en) | 2023-08-11 |
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| CN202310659528.9A Active CN116370030B (en) | 2022-12-06 | 2023-06-06 | Thrombus taking device capable of preventing thrombus from escaping in withdrawal process |
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| CN117379139B (en) * | 2023-12-13 | 2024-03-05 | 东南大学泰州生物医药与医疗器械研究院 | Escape-preventing thrombus taking device |
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| CN217938321U (en) * | 2022-07-25 | 2022-12-02 | 苏州中天医疗器械科技有限公司 | Thrombectomy support |
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| JP2022534296A (en) * | 2019-05-31 | 2022-07-28 | マイクロベンション インコーポレイテッド | Clot collection |
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