External puncture stent

Abstract

This application relates to an external puncture stent, including a frame, an angle seat on the side of the frame, and a guide needle assembly mounted on the angle seat. The angle seat is integrally formed on the side of the frame and has a set of first angle limiting structures distributed in a left-right direction relative to and away from the frame at multiple puncture angle intervals. The set of first angle limiting structures is located on a first side in the front-rear direction of the angle seat. The guide needle assembly has a second angle limiting structure on a second side in the front-rear direction opposite to the first side of the angle seat, which cooperates with the first angle limiting structures. The guide needle assembly is selectively engaged with one of the first angle limiting structures and positioned at a puncture angle by the second angle limiting structure. A corresponding mounting structure is also provided between the guide needle assembly and the angle seat. This external puncture stent not only allows for adjustment of the puncture angle but also facilitates the replacement of guide needle assemblies with different apertures to accommodate puncture needles of different diameters.

Description

Technical Field

[0001] This application relates to puncture medical devices, and more specifically, to an external puncture stent. Background Technology

[0002] When using external ultrasound probes for interventional diagnosis and treatment, doctors select different needle insertion angles based on the depth of the puncture target. Inserting the puncture needle into the body and achieving the target requires guidance from an external puncture stent. Therefore, external puncture stents are generally designed with multiple adjustable angles, primarily falling into two categories: one uses a needle groove plate with needle grooves at different angles, fixed to the stent's mounting base, providing multiple angled needle guide channels. To accommodate puncture needles of different diameters, this stent requires needle groove plates with multiple aperture sizes for doctors to choose from. The other type uses a guide needle assembly with one end rotatably connected to the stent's mounting base to rotate the guide needle channel, combined with an angle positioning structure between the guide needle assembly and the mounting base to achieve multiple angle switching. The guide needle assembly of this type is difficult to detach from the mounting base, and to facilitate doctors using puncture needles of different diameters, a more complex multi-aperture adaptation structure is required, increasing the number of parts and thus increasing product costs. Utility Model Content

[0003] The technical problem to be solved by this application is to provide an extracorporeal puncture stent that can be conveniently adjusted in angle and easily replaced with guide needle assemblies of different apertures, in view of the above-mentioned defects of the prior art.

[0004] The technical solution adopted by this application to solve its technical problem is as follows: An external puncture support is proposed, comprising a frame body that is installed in conjunction with an external ultrasound probe. An angle seat and a guide needle assembly mounted on the angle seat are provided on the side of the frame body. The guide needle assembly has a guide needle channel for guiding a puncture needle. Specifically: the angle seat is integrally formed on the side of the frame body and has a set of first angle limiting structures spaced at multiple puncture angles in the left-right direction relative to and away from the frame body. All of the first angle limiting structures are located on a first side in the front-back direction of the angle seat. A second angle limiting structure, cooperating with the first angle limiting structure, is provided on a second side of the guide needle assembly opposite to the first side of the angle seat in the front-back direction. The guide needle assembly passes through the second angle... The limiting structure selectively engages with one of the first angle limiting structures in the set of first angle limiting structures to position a puncture angle; the guide needle assembly and the angle seat are also provided with a corresponding mounting structure for the engagement of the second angle limiting structure and the set of first angle limiting structures, so as to detachably install and fix the guide needle assembly on a puncture angle on the first side of the angle seat in the front-rear direction; wherein, the set of first angle limiting structures includes a plurality of angle grooves extending along a plurality of puncture angles, and the second angle limiting structure is an angle strip engaged in the angle groove; or, the set of first angle limiting structures includes a plurality of angle strips extending along a plurality of puncture angles, and the second angle limiting structure is an angle groove for engaging the angle strips.

[0005] According to one embodiment of the extracorporeal puncture stent described in this application, the cooperating mounting structure includes a set of first forward and backward movement limiting structures on the angle seat corresponding to the set of first angle limiting structures for limiting the forward and backward movement of the guide needle assembly, and a second forward and backward movement limiting structure on the guide needle assembly that cooperates with the first forward and backward movement limiting structures.

[0006] According to one embodiment of the extracorporeal puncture stent described in this application, a set of first forward and backward movement limiting structures on the angle seat includes a set of snap-fit ​​holes corresponding to multiple angle intervals disposed above the set of first angle limiting structures, the snap-fit ​​holes penetrating the front and rear sides of the angle seat; the second forward and backward movement limiting structure on the guide needle assembly includes a first hook disposed on a first cantilever extending from a second side in the forward and backward direction of the guide needle assembly opposite to the snap-fit ​​holes, the first hook passing through the snap-fit ​​holes and hooking the second side in the forward and backward direction of the angle seat.

[0007] According to one embodiment of the extracorporeal puncture stent described in this application, a set of first forward and backward movement limiting structures on the angle seat further includes a fan-shaped hole disposed in the puncture angle direction of the set of first angle limiting structures and passing through the front and rear sides of the angle seat; the second forward and backward movement limiting structure on the guide needle assembly further includes a second hook disposed opposite the fan-shaped hole, the second hook passing through the fan-shaped hole and hooking the second side of the angle seat in the forward and backward direction.

[0008] According to one embodiment of the extracorporeal puncture stent described in this application, the cooperating mounting structure includes a set of first vertical movement limiting structures on the angle seat corresponding to the set of first angle limiting structures for limiting the vertical movement of the guide needle assembly, and a second vertical movement limiting structure on the guide needle assembly that cooperates with the first vertical movement limiting structures.

[0009] According to one embodiment of the extracorporeal puncture stent described in this application, a set of first vertical movement limiting structures on the angle seat includes a set of limiting grooves corresponding to multiple angle intervals disposed above the set of first angle limiting structures, the limiting grooves extending in the front-back direction; the second vertical movement limiting structure on the guide needle assembly includes a limiting strip extending from a second side of the guide needle assembly in the front-back direction to be inserted into the limiting groove.

[0010] According to one embodiment of the extracorporeal puncture stent described in this application, a set of first vertical movement limiting structures on the angle seat further includes a set of first limiting holes disposed in each of the set of angle slots, the first limiting holes extending from a first side toward a second side in the front-rear direction of the angle seat; the second vertical movement limiting structure on the guide needle assembly further includes a first limiting protrusion protruding from the angle strip to be inserted into the first limiting hole.

[0011] According to one embodiment of the extracorporeal puncture stent described in this application, the guide needle assembly further includes: a first guide needle member, wherein a second angle limiting structure is provided on a second side of the first guide needle member opposite to a first side of the angle seat in the front-back direction, and a guide needle groove penetrating both ends is provided on a first side in the left-right direction; a second guide needle member, wherein a mating surface that mates with the guide needle groove is provided on a second side of the second guide needle member opposite to a first side of the first guide needle member in the left-right direction, and a first end of the upper and lower ends of the second guide needle member is rotatably connected to a corresponding first end of the first guide needle member so that the second guide needle member can rotate relative to the first guide needle member in the front-back direction to combine the mating surface of the second guide needle member with the guide needle groove of the first guide needle member to form the guide needle channel; the first guide needle member and the second guide needle member are also respectively provided with a mating locking structure to detachably lock the second guide needle member and the first guide needle member when the second guide needle member rotates relative to the first guide needle member until the mating surface and the guide needle groove combine to form the guide needle channel.

[0012] In one embodiment of the extracorporeal puncture stent according to this application, the lower end of the second guide needle is rotatably connected to the lower end of the first guide needle in the front-back direction via a pivot extending about in the left-right direction.

[0013] According to one embodiment of the extracorporeal puncture stent described in this application, the cooperating locking structure includes at least one set of locking protrusions and locking holes disposed opposite to the first guide needle member and the second guide needle member to engage with each other when the second guide needle member rotates relative to the first guide needle member until the mating surface and the guide needle groove combine to form a guide needle channel, and a latching position and an elastic latch disposed opposite to the first guide needle member and the second guide needle member to engage with each other when the second guide needle member rotates relative to the first guide needle member until the mating surface and the guide needle groove combine to form a guide needle channel.

[0014] The extracorporeal puncture stent of this application has the following beneficial effects: According to the embodiment of this application, the extracorporeal puncture stent directly provides a set of first angle limiting structures on one side of the angle seat of the stent body, and provides a second angle limiting structure that cooperates with the set of first angle limiting structures on the other side of the guide needle assembly opposite to the angle seat. The guide needle assembly is detachably fixed to a puncture angle on one side of the angle seat by being snapped into one of the first angle limiting structures of the set of first angle limiting structures through the second angle limiting structure. Thus, not only can the puncture angle be selected by switching the snapping cooperation between the second angle limiting structure and the set of first angle limiting structures, but the guide needle assembly can also be separated from the angle seat laterally, making it convenient to replace guide needle assemblies with different apertures to adapt to puncture needles of different diameters. Attached Figure Description

[0015] The present application will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings: Figure 1 This is a schematic diagram of an embodiment of the present application of an external puncture stent mounted on an external ultrasound probe to guide the puncture needle; Figure 2 yes Figure 1 The diagram shows a partial structure of the extracorporeal puncture stent with the guide needle assembly in the open state. Figure 3 yes Figure 2 A partial structural diagram of the extracorporeal stent from another angle; Figure 4 This is a schematic diagram of the structure of an angle seat according to an embodiment of this application; Figure 5 This is an exploded structural diagram of a guide pin assembly according to an embodiment of this application; Figure 6 yes Figure 5 The diagram shows an exploded view of the guide needle assembly from another angle.

[0016] Explanation of icon numbers: 1-External ultrasound probe; 2-Puncture needle; 100-External puncture support; 10-Frame; 20-Angle seat; 21-First angle limiting structure; 211-Angle groove; 22-First forward and backward movement limiting structure; 221-Snap-in hole; 222-Fan-shaped hole; 223-First arc surface; 23-First up and down movement limiting structure; 231-Limiting groove; 232-First limiting hole; 233-Arc-shaped stepped surface; 30-Guide needle assembly; 31-First guide needle component; 311-Guide needle groove; 3111-First guide cone surface; 312-Second angle limiting structure; 3121-Angle bar; 313-Second forward and backward movement limiting structure; 3131-First cantilever; 3132-First operating part; 3133-First hook; 3134-Second hook; 3135-Second arc surface; 314-Second up and down movement limiting structure; 3141-Limiting bar; 3142-First limiting protrusion; 3161-Snap-on position; 3162-First locking protrusion; 3163-First limiting step; 3164-First locking hole; 317-Rotating shaft seat; 32-Second guide needle component; 321-Mating surface; 3211-Second guide cone surface; 322-Second cantilever; 323-Second operating part; 3241-Elastic buckle; 3242-Second locking hole; 3243-Second limiting step; 3244-Second locking protrusion; 325-Rotating shaft; 40-Guide needle channel; 41-Flare mouth. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application. Furthermore, the embodiments and features described herein can be combined with each other unless otherwise specified.

[0018] Figure 1 A schematic diagram is shown illustrating the structure of an external puncture support 100, according to an embodiment of this application, mounted on an external ultrasound probe 1 to guide a puncture needle 2. See also... Figure 1As shown, the extracorporeal puncture support 100 includes a frame 10, an angle seat 20, and a guide needle assembly 30. The frame 10 is used to mate with an extracorporeal ultrasound probe 1 to fix the entire extracorporeal puncture support 100 onto the extracorporeal ultrasound probe 1. The specific structure of the mate installation of the frame 10 and the extracorporeal ultrasound probe 1 can be achieved using various existing technologies, and is not the focus of this application, so it will not be described in detail here. The angle seat 20 is integrally formed on the side of the frame 10, and is preferably located on one side of the extracorporeal ultrasound probe 1 in the width direction. The guide needle assembly 30 is detachably mounted on the angle seat 20, providing a guide needle channel 40 to guide the puncture needle 2 for puncture.

[0019] In this application, the two sides of the angle seat 20 that are relatively close to and far from the frame 10 are defined as the two sides in the left-right direction, the two ends corresponding to the head-tail direction of the external ultrasound probe 1 are defined as the lower end and upper end in the up-down direction, and the two sides in another direction that are perpendicular to the left-right direction and the up-down direction are defined as the two sides in the front-back direction.

[0020] See details Figure 1 Combination Figure 2 As shown, a set of first angle limiting structures 21 is provided on the first side (front side in the figure) of the angle seat 20 in the front-rear direction. The set of first angle limiting structures 21 are distributed at multiple puncture angle intervals between the two sides of the angle seat 20 in the left-right direction, which are relatively close to and far from the frame 10. The guide needle assembly 30 is further composed of a first guide needle member 31 and a second guide needle member 32. The first side (right side in the figure) of the first guide needle member 31 in the left-right direction is provided with a guide needle groove 311 that runs through both the upper and lower ends. The second side (left side in the figure) of the second guide needle member 32, which is opposite to the first side of the first guide needle member 31 in the left-right direction, is provided with a mating surface 321 that mates with the guide needle groove 311. Furthermore, the first end of the upper and lower ends of the second guide needle 32 (the lower end in the figure) is rotatably connected to the corresponding first end of the first guide needle 31 (the lower end in the figure), so that the second guide needle 32 can rotate rearward relative to the first guide needle 31 in the front-back direction and lock with the first guide needle 31, thereby combining the mating surface 321 of the second guide needle 32 with the guide needle groove 311 of the first guide needle 31 to form the guide needle channel 40 (see...). Figure 1 (as shown), or it can rotate forward relative to the first guide needle 31 in the front-rear direction to separate from the first guide needle 31, thereby opening the guide needle channel 40 (see...). Figure 2(As shown). Furthermore, the first guide needle 31 and the second guide needle 32 are each provided with a cooperating locking structure to detachably lock the second guide needle 32 and the first guide needle 31 when the second guide needle 32 rotates relative to the first guide needle 31 until the mating surface 321 engages with the guide needle groove 311 to form the guide needle channel 40. Further, the second side (i.e., the rear side in the figure) of the first guide needle 31, opposite to the first side of the angle seat 20 in the front-rear direction, is provided with a second angle limiting structure 312 that cooperates with a set of first angle limiting structures 21. The entire guide needle assembly 30 can be selectively engaged with one of the first angle limiting structures 21 in the set of first angle limiting structures 21 via the second angle limiting structure 312, thus positioning it at a puncture angle corresponding to that angle limiting structure 21 on the first side of the angle seat 20 in the front-rear direction. Furthermore, a corresponding mounting structure is provided between the first guide needle member 31 and the angle seat 20 to cooperate with the second angle limiting structure 312 and a set of first angle limiting structures 21, so as to detachably install and fix the entire guide needle assembly 30 at a puncture angle on the first side in the front-back direction of the angle seat 20. Specifically, the angle seat 20 is also provided with a set of first front-back movement limiting structures 22 for limiting the front-back movement of the guide needle assembly 20 and a set of first up-down movement limiting structures 23 for limiting the up-down movement of the guide needle assembly 20, corresponding to the set of first angle limiting structures 21. The first guide needle member 31 of the guide needle assembly 30 is provided with a second front-back movement limiting structure 313 that cooperates with the first front-back movement limiting structure 22 and a second up-down movement limiting structure 314 that cooperates with the first up-down movement limiting structure 23, so as to limit the movement of the guide needle assembly 30 on the angle seat 20.

[0021] According to a specific embodiment of this application, see Figure 4 As shown, a set of first angle limiting structures 21 on the angle seat 20 includes multiple angle grooves 211 formed on a first side in the front-rear direction of the angle seat 20, the multiple angle grooves 211 extending along multiple puncture angles respectively. A set of first front-rear movement limiting structures 22 on the angle seat 20 includes a set of snap-fit ​​holes 221 disposed above the multiple angle grooves 211, corresponding to multiple angle intervals, each snap-fit ​​hole 221 penetrating both the front and rear sides of the angle seat 20. The set of first front-rear movement limiting structures 22 on the angle seat 20 also includes a fan-shaped hole 222 disposed below the multiple angle grooves 211 in the puncture direction, the fan-shaped hole 222 penetrating both the front and rear sides of the angle seat 20. The lower end of the fan-shaped hole 222 preferably forms a first arc surface 223. See further. Figure 4As shown, a set of first vertical movement limiting structures 23 on the angle seat 20 includes a set of limiting grooves 231 corresponding to multiple angle intervals, disposed above multiple angle grooves 211. These limiting grooves 231 can be formed on the arc-shaped stepped surface 233 protruding outwards from the lower side of the set of snap-fit ​​holes 221 on the first side of the angle seat 20 in the front-rear direction, and extend along the front-rear direction. The set of first vertical movement limiting structures 23 on the angle seat 20 also includes a set of first limiting holes 232 disposed at the upper end of each angle groove 211 of the set of angle grooves 211. Each first limiting hole 232 extends from the first side to the second side in the front-rear direction of the angle seat 20.

[0022] Correspondingly, see Figure 5 and Figure 6 As shown, the second angle limiting structure 312 on the first guide needle component 31 is an angle strip 3121 protruding from the second side in the front-rear direction of the first guide needle component 31. This angle strip 3121 extends along the puncture angle opposite to the angle groove 211 on the angle seat 20. By aligning the angle strip 3121 with one of the multiple angle grooves 211 on the angle seat 20 and inserting it, the entire guide needle assembly 30 can be positioned at the puncture angle corresponding to that angle groove 211 on the angle seat 20. See also... Figure 5 and Figure 6 As shown, the second forward and backward movement limiting structure 313 on the first guide needle member 31 includes a first hook 3133 disposed opposite to the latching hole 221 on the angle seat 20. This first hook 3133 is disposed on a first cantilever 3131 extending from the second side in the forward and backward direction of the first guide needle member 31, and can pass through the latching hole 221 to hook onto the second side in the forward and backward direction of the angle seat 20. The second forward and backward movement limiting structure 313 on the first guide needle member 31 also includes a second hook 3134 disposed opposite to the fan-shaped hole 222 on the angle seat 20. This second hook 3134 can pass through the fan-shaped hole 222 to hook onto the second side in the forward and backward direction of the angle seat 20. Furthermore, the second hook 3134 preferably has a second arcuate surface 3135 that mates with the first arcuate surface 223 of the fan-shaped hole 222, serving as a rotation fulcrum for angle adjustment and guiding the second hook 3134 to rotate within the fan-shaped hole 222. See further details. Figure 5 and Figure 6 As shown, the second vertical movement limiting structure 314 on the first guide needle 31 includes a limiting strip 3141 protruding below the first cantilever 3131 on the second side of the first guide needle 31 in the front-rear direction. The limiting strip 3141 extends in the front-rear direction opposite to the limiting groove 231 on the angle seat 20 to be inserted into the limiting groove 231. The second vertical movement limiting structure 314 on the first guide needle 31 also includes a first limiting protrusion 3142 protruding from the upper end of the angle strip 3121 to be inserted into the first limiting hole 232 in each angle groove 211 on the angle seat 20.

[0023] When mounting the guide assembly 30 onto the angle seat 20, first, the second hook 3134 at the lower end of the first guide needle 31 is inserted into the fan-shaped hole 222 on the angle seat 20, hooking the second side of the angle seat 20 in the front-back direction. Then, the angle strip 3121 on the first guide needle 31 is aligned with one of the multiple angle slots 211 on the angle seat 20 and inserted. At the same time, the limiting strip 3141 on the first guide needle 31 is inserted along the corresponding limiting slot 231 on the angle seat 20. Then, the first hook 3133 on the first guide needle 31 is passed through the buckle hole 221 and hooked onto the second side of the angle seat 20 in the front-back direction, thus fixing the entire guide needle assembly 30 at the puncture angle corresponding to the first side of the angle seat 20 in the front-back direction and the angle slot 211. At this time, the angle strip 3121 of the first guide needle component 31 is pressed against the angle groove 211 on the angle seat 20, and the first hook 3133 and the second buckle 3134 hook onto the second side of the angle seat 20, which can restrict the degree of freedom of the guide needle assembly 30 in the front-back direction on the angle seat 20. The limiting strip 3141 of the first guide needle component 31 is inserted into the limiting groove 231 on the angle seat 20, and at the same time, the first limiting protrusion 3142 of the first guide needle component 31 is inserted into the first limiting hole 232 on the angle seat 20, which can restrict the degree of freedom of the guide needle assembly 30 in the up-down direction on the angle seat 20. When it is necessary to separate the guide needle assembly 30 from the angle seat 20, simply press the first cantilever 3131 of the first guide needle component 31 so that the first hook 3133 no longer hooks onto the angle seat 20, and the guide needle assembly 30 can be separated from the angle seat 20 laterally from the first side in the front-back direction. To facilitate pressing operations, a first operating part 3132 is also provided on the first cantilever 3131.

[0024] According to a specific embodiment of this application, see also Figure 5 and Figure 6 As shown, the lower end of the second guide needle 32 is provided with a left-right extending pivot 325, which is inserted into the pivot seat 317 provided at the lower end of the first guide needle 31 to achieve a rotatable connection in the front-back direction. This allows the second guide needle 32 to rotate rearward relative to the first guide needle 31 and lock with the first guide needle 31, thereby combining the mating surface 321 of the second guide needle 32 with the guide needle groove 311 of the first guide needle 31 to form a guide needle channel 40 (see...). Figure 1 (as shown), or it can rotate forward relative to the first guide needle 31 and separate from the first guide needle 31, thereby opening the guide needle channel 40 (see...). Figure 2 (As shown).

[0025] According to a specific embodiment of this application, see further details. Figure 5 and Figure 6As shown, the locking structure cooperating on the first guide needle 31 and the second guide needle 32 includes a first locking protrusion 3162, a first locking hole 3164 and a second locking hole 3242, a second locking protrusion 3244, and a latching position 3161 and a resilient latching position 3241, all arranged opposite each other. When the second guide needle 32 rotates relative to the first guide needle 31 until the mating surface 321 engages with the guide needle groove 311 to form the guide needle channel 40, the first locking protrusion 3162, the first locking hole 3164 and the second locking hole 3242, and the second locking protrusion 3244 engage with each other, and the latching position 3161 and the resilient latching position 3241 engage with each other, thereby detachably locking the second guide needle 32 and the first guide needle 31. See details. Figure 5 and Figure 6 In the embodiment shown, the latching position 3161 extends outward from the upper end of the first side in the front-rear direction of the first guide needle member 31, and the first locking protrusion 3162 extends outward from the lower side of the latching position 3161 in the front-rear direction of the first guide needle member 31. The first limiting step 3163 and the first locking hole 3164 are respectively formed on the second side in the front-rear direction of the guide needle groove 311 of the first guide needle member 31. Preferably, there are two first locking holes 3164 distributed vertically. Correspondingly, the elastic buckle 3241 on the second guide needle 32 is disposed on the second cantilever 322 extending from the first side to the second side in the front-rear direction of the second guide needle 32, opposite the buckle position 3161 on the first guide needle 31. The second locking hole 3242 is opened on the first side in the front-rear direction of the second guide needle 32, opposite the first locking protrusion 3162 on the first guide needle 31. The second limiting step 3243 and the second locking protrusion 3244 are respectively formed on the second side in the front-rear direction of the mating surface 321 of the second guide needle 32, opposite the first limiting step 3163 and the first locking hole 3164 on the first guide needle 31. Preferably, there are two second locking protrusions 3244 distributed vertically. When the second guide needle 32 rotates rearward relative to the first guide needle 31 until the second limiting step 3243 abuts against the first limiting step 3163, and the first locking protrusion 3162 and the second locking protrusion 3244 respectively engage in the second locking hole 3242 and the first locking hole 3164, and the elastic buckle 3241 hooks onto the buckle position 3161, the second guide needle 32 and the first guide needle 31 are locked, and the mating surface 321 of the second guide needle 32 and the guide needle groove 311 of the first guide needle 31 combine to form the guide needle channel 40. Preferably, see Figure 5 and Figure 6As shown, the inlet end of the guide groove 311 of the first guide needle member 31 forms a first guide cone surface 3111, and the inlet end of the mating surface 321 of the second guide needle member 32 forms a second guide cone surface 3211. When the second guide needle member 32 is locked with the first guide needle member 31 to combine the mating surface 321 with the guide groove 311 to form the guide needle channel 40, the second guide cone surface 3211 and the first guide cone surface 3111 together form a bell mouth 41 (see...). Figure 1 (As shown), to facilitate the insertion of the puncture needle 2. When separating the second guide needle member 32 from the first guide needle member 31, simply press the second cantilever 322 on the second guide needle member 32 to disengage the second hook 3134 on the first guide needle member 31 from the latch position 3161, and the second guide needle member 32 can be rotated forward to separate from the first guide needle member 31, thereby opening the guide needle channel 40. To facilitate the pressing operation, the second cantilever 322 is also provided with a second operating part 323.

[0026] The extracorporeal puncture stent 100 according to the above embodiments of this application can not only select multiple puncture angles by switching the second angle limiting structure 312 on the guide needle assembly 30 and the multiple sets of first angle limiting structures 21 on the angle seat 20, but also can laterally separate the guide needle assembly 30 from the angle seat 20, so as to facilitate the replacement of the guide needle assembly 30 with guide needle channels 40 with different apertures to adapt to puncture needles 2 of different diameters.

[0027] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An external puncture support, comprising a frame body for mounting in conjunction with an external ultrasound probe, wherein the side of the frame body is provided with an angle seat and a guide needle assembly mounted on the angle seat, the guide needle assembly having a guide needle channel for guiding a puncture needle, characterized in that: The angle seat is integrally formed on the side of the frame and has a set of first angle limiting structures distributed in the left and right directions relatively close to and far from the frame, with multiple puncture angle intervals. The set of first angle limiting structures is all located on the first side in the front and back direction of the angle seat. The guide needle assembly has a second angle limiting structure on its second side opposite to the first side of the angle seat in the front-back direction. The guide needle assembly is selectively engaged with one of the first angle limiting structures in the set of first angle limiting structures by the second angle limiting structure to position a puncture angle. The guide needle assembly and the angle seat are further provided with a matching mounting structure corresponding to the cooperation between the second angle limiting structure and a set of first angle limiting structures, so as to detachably install and fix the guide needle assembly at a puncture angle on the first side of the angle seat in the front-back direction. Wherein, the set of first angle limiting structures includes a plurality of angle grooves extending along a plurality of puncture angles, and the second angle limiting structure is an angle strip that is fitted into the angle grooves; or, the set of first angle limiting structures includes a plurality of angle strips extending along a plurality of puncture angles, and the second angle limiting structure is an angle groove for fitting the angle strips.

2. The in-vitro puncture stent of claim 1, wherein, The matching installation structure includes a set of first forward and backward movement limiting structures on the angle seat corresponding to the set of first angle limiting structures for limiting the forward and backward movement of the guide needle assembly, and a second forward and backward movement limiting structure on the guide needle assembly that cooperates with the first forward and backward movement limiting structures.

3. The extracorporeal puncture stent according to claim 2, characterized in that, The first set of front-to-back movement limiting structures on the angle seat includes a set of snap-fit ​​holes corresponding to multiple angle intervals, which are disposed above the first set of angle limiting structures and pass through the front and rear sides of the angle seat; the second set of front-to-back movement limiting structures on the guide needle assembly includes a first hook disposed on a first cantilever extending from the second side of the guide needle assembly in the front-to-back direction opposite to the snap-fit ​​holes, which passes through the snap-fit ​​holes and hooks the second side of the angle seat in the front-to-back direction.

4. The extracorporeal puncture stent according to claim 3, characterized in that, The first set of front-to-back movement limiting structures on the angle seat also includes a fan-shaped hole disposed in the puncture angle direction of the first set of angle limiting structures and passing through the front and back sides of the angle seat; the second set of front-to-back movement limiting structures on the guide needle assembly also includes a second hook disposed opposite the fan-shaped hole, the second hook passing through the fan-shaped hole and hooking the second side of the angle seat in the front-to-back direction.

5. The extracorporeal puncture stent according to claim 1, characterized in that, The matching installation structure includes a set of first vertical movement limiting structures on the angle seat corresponding to the set of first angle limiting structures for limiting the vertical movement of the guide needle assembly, and a second vertical movement limiting structure on the guide needle assembly that cooperates with the first vertical movement limiting structures.

6. The extracorporeal puncture stent according to claim 5, characterized in that, The first set of vertical movement limiting structures on the angle seat includes a set of limiting grooves corresponding to multiple angle intervals, which are disposed above the first set of angle limiting structures and extend in the front-back direction; the second set of vertical movement limiting structures on the guide needle assembly includes a limiting strip that extends from a second side of the guide needle assembly in the front-back direction to be inserted into the limiting groove.

7. The extracorporeal puncture stent according to claim 6, characterized in that, The first set of vertical movement limiting structures on the angle seat also includes a set of first limiting holes disposed in each of the set of angle slots, the first limiting holes extending from the front and rear direction of the angle seat from a first side to a second side; the second set of vertical movement limiting structures on the guide pin assembly also includes a first limiting protrusion protruding from the angle bar to be inserted into the first limiting hole.

8. The extracorporeal stent according to any one of claims 1-7, characterized in that, The guide pin assembly further includes: The first guide needle component has a second angle limiting structure on its second side in the front-back direction opposite to the first side of the angle seat, and a guide needle groove through the upper and lower ends is provided on its first side in the left-right direction. The second guide needle has a mating surface on its second side in the left-right direction, which is opposite to the first side of the first guide needle and engages with the guide needle groove. Furthermore, the first end of the upper and lower ends of the second guide needle is rotatably connected to the corresponding first end of the first guide needle so that the second guide needle can rotate relative to the first guide needle in the front-back direction, thereby combining the mating surface of the second guide needle with the guide needle groove of the first guide needle to form the guide needle channel. The first guide needle and the second guide needle are also provided with a matching locking structure to detachably lock the second guide needle and the first guide needle when the second guide needle rotates relative to the first guide needle until the mating surface and the guide needle groove are combined to form a guide needle channel.

9. The extracorporeal puncture stent according to claim 8, characterized in that, The lower end of the second guide needle is rotatably connected to the lower end of the first guide needle in the front-back direction via a pivot extending in the left-right direction.

10. The extracorporeal puncture stent according to claim 8, characterized in that, The cooperating locking structure includes at least one set of locking protrusions and locking holes disposed opposite to the first guide needle member and the second guide needle member to engage with each other when the second guide needle member rotates relative to the first guide needle member until the mating surface and the guide needle groove combine to form a guide needle channel, and a latching position and an elastic latch disposed opposite to the first guide needle member and the second guide needle member to engage with each other when the second guide needle member rotates relative to the first guide needle member until the mating surface and the guide needle groove combine to form a guide needle channel.

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