Safe locking structure and ultrasonic biopsy needle

Abstract

The utility model relates to the technical field of medical instruments, and particularly discloses a safe locking structure and an ultrasonic biopsy needle, at least comprising a slide bar and a locking mechanism capable of being locked on the slide bar, the slide bar is provided with a plurality of tooth sockets arranged along the axial direction, the locking mechanism at least comprises a sleeve, a locking button and an elastic piece, the sleeve is provided with a locking hole penetrating to the tooth groove. The locking button is provided with a hinging part, a pressing part and a locking tooth part, and the locking button is hinged to the sleeve; the locking tooth part penetrates through the locking hole and is matched with the tooth groove; and the elastic piece is arranged between the pressing part and the sleeve. According to the structure, the locking tooth part is separated from the tooth groove in the depth direction of the tooth groove, the pressing stroke of the locking tooth part is smaller, the locking button is connected with the sleeve in a hinged mode, and when the locking button is pressed, the needed force is smaller, and the operation comfort is better; the elastic piece is located between the pressing part of the locking button and the sleeve and does not make contact with the sliding rod, and friction between the elastic piece and the sliding rod does not exist.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, specifically to a safety locking structure and an ultrasonic biopsy needle. Background Technology

[0002] An ultrasonic biopsy needle is a medical device used in conjunction with endoscopic ultrasound for tissue sampling. It typically includes a first handle connected to an external needle tube and a second handle connected to the biopsy needle tube. The first handle controls the synchronous movement of both the external and biopsy needle tubes within the endoscope, while the second handle controls the movement of the biopsy needle tube within the external needle tube. The ultrasonic biopsy needle also requires a safety locking mechanism to control the movement of the first handle and limit the displacement of the second handle.

[0003] Chinese invention patent CN105943092A discloses a safety locking device, including a needle adjustment tube and a safety lock that can be locked onto the needle adjustment tube. The outer surface of the needle adjustment tube is provided with a toothed structure. The safety lock includes a safety lock cover, an unlock button, and a spring. The safety lock cover encapsulates the unlock button and the spring into a whole and covers the needle adjustment tube. The unlock button has a protrusion adapted to the toothed structure. A spring is provided between the needle adjustment tube and the unlock button. When the safety lock is not moved, the two sides of the spring push open the unlock button and the needle adjustment tube respectively, so that the protrusion on the unlock button is locked in the toothed structure on the needle adjustment tube. When the safety lock is moved, the unlock button is pressed, the spring is compressed, the protrusion on the unlock button moves out of the toothed structure on the needle adjustment tube, and the safety lock is controlled to move along the surface of the needle adjustment tube.

[0004] However, the aforementioned safety locking device has the following drawbacks:

[0005] (1) The spring is located between the needle adjustment tube and the unlock button. When it moves, there will be friction between the spring and the needle adjustment tube;

[0006] (2) When the unlock button is pressed, the protrusion on the unlock button moves out of the tooth groove along the length of the tooth groove to complete the unlocking. The pressing stroke is relatively large. Summary of the Invention

[0007] The technical problem to be solved by this utility model is to overcome the technical defects of existing ultrasonic biopsy needle safety locking devices, such as friction between the spring and the adjusting tube during movement and large pressing stroke during unlocking.

[0008] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a safety locking structure, comprising at least a slide rod and a locking mechanism capable of locking onto the slide rod, wherein the slide rod is provided with a plurality of toothed grooves arranged in an axial direction, and the locking mechanism comprises at least:

[0009] A sleeve is fitted onto the slide rod and slidably connected to the slide rod. The sleeve is provided with a locking hole that extends through to the tooth groove. An axial guide mechanism is provided between the sleeve and the slide rod.

[0010] A locking button is provided with a hinge portion, and the locking button is hinged to the sleeve through the hinge portion; the locking button also includes a pressing portion and a locking tooth portion located on both sides of the hinge portion, the locking tooth portion passing through the locking hole and being adapted to the tooth groove;

[0011] An elastic element is disposed between the pressing part and the sleeve and drives the locking teeth to engage with the tooth groove.

[0012] In a preferred embodiment, axially extending wall-like structures are symmetrically arranged on both sides of the locking hole, and a receiving area for accommodating the locking button is formed between the opposing wall-like structures; a bearing wall opposite to the pressing part is also provided in the receiving area of ​​the sleeve.

[0013] In a preferred embodiment, hinge holes are symmetrically arranged on the inner side of the wall-like structure, and hinge shafts adapted to and connected to the hinge holes are provided on both sides of the hinge portion.

[0014] In a preferred embodiment, the hinge portion includes a pair of opposing lugs, each lug having a through hole for accommodating a hinge shaft.

[0015] In a preferred embodiment, the elastic element is a torsion spring, which is sleeved on a hinge shaft between a pair of lugs, and the torsion arms at both ends of the torsion spring abut against the pressing part and the bearing wall, respectively.

[0016] In a preferred embodiment, the elastic element is a compression spring disposed between the pressing part and the bearing wall.

[0017] In a preferred embodiment, the axial guide mechanism includes mutually adapted axial guide grooves and axial protrusions, wherein the axial guide grooves and axial protrusions are respectively disposed between the inner wall of the sleeve and the outer wall of the slide rod.

[0018] In a preferred embodiment, the sleeve includes a pair of symmetrically arranged sleeve units, each sleeve unit having a hoop step at both ends; the sleeve also includes a pair of fixing rings, the fixing rings fitting into the hoop steps to fix the pair of sleeve units together.

[0019] In a preferred embodiment, the sleeve is integrally injection molded.

[0020] This utility model also discloses an ultrasonic biopsy needle, which includes at least a first slide rod, a second slide rod, a first handle, a second handle, a first locking mechanism, and a second locking mechanism. The first slide rod and the second slide rod adopt the slide rod structure of the safety locking structure, and the first locking mechanism and the second locking mechanism adopt the locking mechanism of the safety locking structure. One end of the first handle is fixedly connected to the first locking mechanism, and the other end of the first handle is fixedly connected to the second slide rod. The first locking mechanism is adapted to be connected to the first slide rod. The second locking mechanism is adapted to be connected to the second slide rod. The second handle is axially movably connected to the second slide rod and is located on the side of the second locking mechanism away from the first handle.

[0021] The working principle of the safety locking structure and ultrasonic biopsy needle in this embodiment is as follows: In its natural state, based on the elastic potential energy of the elastic element, the locking teeth engage with the tooth groove, thereby locking the locking mechanism onto the slide rod. When it is necessary to move the position of the locking mechanism, press the pressing part of the locking button. Under the action of the pressing force, the locking button is driven to rotate, and the locking teeth disengage from the tooth groove, thereby releasing the locking state and allowing the position of the locking mechanism to be moved on the slide rod.

[0022] The safety locking structure and ultrasonic biopsy needle of this embodiment have the following advantages compared with the prior art:

[0023] (1) The locking teeth disengage from the tooth groove along the depth direction. Compared with the method of disengaging from the tooth groove along the length direction, the pressing stroke is smaller and the operation is more comfortable.

[0024] (2) The locking button is connected to the sleeve by a hinge. When pressing the locking button, less force is required and the operation is more comfortable.

[0025] (3) The elastic element is located between the pressing part of the locking button and the sleeve, and does not contact the slide bar, so there is no friction between it and the slide bar. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the security locking structure in this embodiment;

[0027] Figure 2 for Figure 1 A schematic diagram of the explosion-state structure of the safety locking structure shown.

[0028] Figure 3 for Figure 1 A partial cross-sectional view of the safety locking structure shown.

[0029] Figure 4 for Figure 1 A schematic diagram of the bottom structure of the safety locking structure shown.

[0030] Figure 5 This is a schematic diagram of the locking mechanism in the safety locking structure of this embodiment;

[0031] Figure 6 for Figure 5 The diagram shows the structure of the sleeve in the locking mechanism.

[0032] Figure 7 for Figure 6 The diagram shows the structural schematic of the sleeve unit in the sleeve shown.

[0033] Figure 8 This is a schematic diagram of another embodiment of the sleeve in this example;

[0034] Figure 9 for Figure 5 A schematic diagram of the locking button in the locking mechanism shown;

[0035] Figure 10 This is a partial cross-sectional view of another embodiment of the security locking structure in this example;

[0036] Figure 11 This is a schematic diagram of the operating part of the ultrasonic biopsy needle in this embodiment. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0038] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0039] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation", "connection" and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, an integral connection, or a detachable connection; they can refer to the internal connection of two components; they can refer to a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0040] One example of a security locking structure in this embodiment is as follows: Figure 1 , Figure 2As shown, it includes a slide rod 10 and a locking mechanism that can be locked onto the slide rod 10, wherein the slide rod 10 is provided with a plurality of toothed grooves 11 arranged in the axial direction.

[0041] In this embodiment, the locking mechanism includes a sleeve 20, a locking button 30, and an elastic element. Wherein, as... Figure 6 As shown, the sleeve 20 has an axial mounting cavity 21. The sleeve 20 is sleeved on the slide rod 10 through the axial mounting cavity 21 and is slidably connected to the slide rod 10. The sleeve 20 is provided with a locking hole 22 that extends through the tooth groove 11.

[0042] In this embodiment, as Figure 6 As shown, axially extending wall-like structures 2012 are symmetrically arranged on both sides of the locking hole 22, and a receiving area 25 for accommodating the locking button 30 is formed between the opposing wall-like structures 2012. A bearing wall 24 is also provided in the receiving area 25 of the sleeve 20, which is opposite to the pressing part 30.

[0043] Preferably, in this embodiment, hinge holes 2014 are symmetrically provided on the inner side of the wall structure 2012.

[0044] Preferably, in this embodiment, the structure of the sleeve 20 in the first implementation is as follows: Figure 2 , Figure 7 As shown, it includes a pair of symmetrically arranged sleeve units and a pair of retaining rings that fix the sleeve units together. The sleeve units include a first sleeve unit 201 and a second sleeve unit 202, and the retaining rings include a first retaining ring 203 and a second retaining ring 204.

[0045] In this embodiment, the structure of the sleeve unit is described in detail based on the first sleeve unit 201, such as... Figure 7 As shown, the first sleeve unit 201 includes an arc-shaped body 2011, which is provided with a wall-shaped structure 2012. The wall-shaped structure 2012 is provided with a hinge hole 2014. A bearing wall body 2017 is provided on one side of the wall-shaped structure 2012 near the end. The bearing wall bodies 2017 of a pair of sleeve units are combined to form a bearing wall 24.

[0046] In this embodiment, the first sleeve unit 201 is provided with hoop steps at both ends, namely the first hoop step 2015 and the second hoop step 2016. After the first sleeve unit 201 and the second sleeve unit 202 are combined, the first fixing ring 203 and the second fixing ring 204 are respectively sleeved on the hoop steps at both ends and fixed by adhesive bonding or ultrasonic welding, thereby fixing the first sleeve unit 201 and the second sleeve unit 202 into one piece.

[0047] In this embodiment, another equivalent implementation is as follows: Figure 8 As shown, the sleeve 20 is integrally injection molded. Preferably, for ease of assembly, the hinge hole 2014 on at least one side of the wall structure 2012 is a through hole, facilitating the insertion of the hinge shaft 40.

[0048] In this embodiment, as Figure 4 As shown, an axial guiding mechanism is provided between the sleeve 20 and the slide rod 10, so that the sleeve can only be displaced axially along the slide rod, but cannot rotate relative to the slide rod. Preferably, in this embodiment, the axial guiding mechanism includes a mutually adapted axial guide groove 12 and an axial protrusion 23. It should be noted that in this embodiment, the axial guide groove 12 is disposed on the outer wall of the slide rod 10, and the axial protrusion 23 is disposed on the inner wall of the sleeve 20. Figure 7 As shown, the first sleeve unit 201 is provided with an axial protrusion unit 2013, and a pair of sleeve units are combined to form an axial protrusion 23. As an equivalent embodiment, the axial guide groove 12 can also be provided on the inner wall of the sleeve 20, and correspondingly, the axial protrusion 23 is provided on the outer wall of the slide rod 10.

[0049] In this embodiment, as Figure 2 , Figure 9 As shown, the locking button 30 is provided with a hinge portion 32, and also includes a pressing portion 31 and a locking tooth portion 33 located on both sides of the hinge portion 32. The locking tooth portion 33 passes through the locking hole 22 and is adapted to the tooth groove 11. When the locking tooth portion 33 is located in the tooth groove 11, the locking mechanism is locked on the slide rod 10.

[0050] Preferably, in this embodiment, the hinge portion 32 includes a pair of oppositely arranged lugs 321, each lug 321 having a through hole 34 for accommodating the hinge shaft 40, and both ends of the hinge shaft 40 respectively engaging with the hinge hole 2014.

[0051] It should be noted that the above-described embodiments are merely preferred embodiments of this embodiment. As equivalent embodiments, the hinge hole can also be provided on the hinge part, and the hinge post adapted to the hinge hole can be provided at the corresponding position on the wall structure.

[0052] In this embodiment, an elastic member is also provided between the pressing part 31 and the bearing wall of the sleeve 20, for driving the locking tooth part 33 to engage with the tooth groove 11.

[0053] In this embodiment, a preferred implementation is as follows: Figure 2 , Figure 3As shown, the elastic element is a torsion spring 50, which is sleeved on the hinge shaft 40 between a pair of lugs. The torsion arms at both ends of the torsion spring 50 abut against the pressing part 31 and the bearing wall 24 respectively. In its natural state, the torsion spring drives the locking tooth 33 to engage with the tooth groove 11.

[0054] In this embodiment, another preferred implementation is as follows: Figure 10 As shown, the elastic element is a compression spring 51 disposed between the pressing part 31 and the bearing wall 24. In its natural state, the compression spring 51 is in a compressed state, thereby driving the locking tooth part 33 to engage with the tooth groove 11.

[0055] In the natural state, the safety locking structure of this embodiment, based on the elastic potential energy of the elastic element, engages the locking teeth 33 with the tooth groove 11, thereby locking the locking mechanism onto the slide bar 10. When it is necessary to move the position of the locking mechanism, the pressing part 31 of the locking button 30 is pressed. Under the action of the pressing force, the locking button 30 is driven to rotate around the hinge axis, and the locking teeth 33 disengage from the tooth groove 11, thereby releasing the locked state and allowing the position of the locking mechanism to be moved on the slide bar.

[0056] like Figure 11 As shown, an ultrasonic biopsy needle of this embodiment includes an operating part comprising a first slide bar 101, a second slide bar 102, a first handle 301, a second handle 302, a first locking mechanism 210, and a second locking mechanism 220. One end of the first handle 301 is fixedly connected to the first locking mechanism 210, and the other end of the first handle 301 is fixedly connected to the second slide bar 102. The first locking mechanism is adapted to be connected to the first slide bar 101. The second locking mechanism 220 is adapted to be connected to the second slide bar 102. The second handle 302 is axially movably connected to the second slide bar 102 and is located on the side of the second locking mechanism away from the first handle.

[0057] It should be noted that the first slide bar 101 and the second slide bar 102 adopt the slide bar 10 in the aforementioned safety locking structure, and the first locking mechanism 210 and the second locking mechanism 220 adopt the locking mechanism in the aforementioned safety locking structure.

[0058] The first handle 301 is connected to the external needle tube (not shown in the figure) and is used to control the synchronous movement of the external needle tube and the biopsy needle tube (not shown in the figure) in the endoscope. The second handle 302 is used to control the movement of the biopsy needle tube in the external needle tube. The second locking mechanism 220 is used to limit the movement position of the second handle 302.

[0059] In summary, the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A safety locking structure, comprising at least a slide rod and a locking mechanism capable of locking onto the slide rod, wherein the slide rod is provided with a plurality of toothed grooves arranged in an axial direction, characterized in that, The locking mechanism includes at least: A sleeve is fitted onto the slide rod and slidably connected to the slide rod. The sleeve is provided with a locking hole that extends through to the tooth groove. An axial guide mechanism is provided between the sleeve and the slide rod. A locking button is provided with a hinge portion, and the locking button is hinged to the sleeve through the hinge portion; the locking button also includes a pressing portion and a locking tooth portion located on both sides of the hinge portion, the locking tooth portion passing through the locking hole and being adapted to the tooth groove; An elastic element is disposed between the pressing part and the sleeve and drives the locking teeth to engage with the tooth groove.

2. The security locking structure according to claim 1, characterized in that, The locking hole has symmetrically arranged wall-like structures extending axially on both sides, and the oppositely arranged wall-like structures form a receiving area for accommodating the locking button; the receiving area of ​​the sleeve is also provided with a bearing wall opposite to the pressing part.

3. The security locking structure according to claim 2, characterized in that, The inner side of the wall-like structure is symmetrically provided with hinge holes, and the two sides of the hinge part are provided with hinge shafts that are adapted to connect with the hinge holes.

4. The security locking structure according to claim 3, characterized in that, The hinge portion includes a pair of oppositely arranged lugs, each lug having a through hole for accommodating the hinge shaft.

5. The security locking structure according to claim 4, characterized in that, The elastic element is a torsion spring, which is sleeved on a hinge shaft between a pair of lugs, and the torsion arms at both ends of the torsion spring abut against the pressing part and the bearing wall, respectively.

6. The security locking structure according to claim 2, characterized in that, The elastic element is a compression spring disposed between the pressing part and the bearing wall.

7. The security locking structure according to claim 1, characterized in that, The axial guide mechanism includes mutually adapted axial guide grooves and axial protrusions, which are respectively disposed between the inner wall of the sleeve and the outer wall of the slide rod.

8. The security locking structure according to any one of claims 2-7, characterized in that, The sleeve includes a pair of symmetrically arranged sleeve units, and each sleeve unit has a hoop step at both ends; the sleeve also includes a pair of fixing rings, which fix the pair of sleeve units into one piece by fitting with the hoop steps.

9. The security locking structure according to any one of claims 2-7, characterized in that, The sleeve is integrally injection molded.

10. An ultrasonic biopsy needle, characterized in that, It includes at least a first slide bar, a second slide bar, a first handle, a second handle, a first locking mechanism, and a second locking mechanism. The structure of the first slide bar and the second slide bar adopts the slide bar of the safety locking structure according to any one of claims 1-9. The first locking mechanism and the second locking mechanism adopt the locking mechanism of the safety locking structure according to any one of claims 1-9. One end of the first handle is fixedly connected to the first locking mechanism, and the other end of the first handle is fixedly connected to the second slide bar. The first locking mechanism is adapted to be connected to the first slide bar. The second locking mechanism is adapted to be connected to the second slide bar. The second handle is axially movably connected to the second slide bar and is located on the side of the second locking mechanism away from the first handle.

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