Rotary cutting biopsy needle

Abstract

The utility model provides a rotary cutting biopsy needle, which belongs to the technical field of biopsy equipment, and comprises a first transmission sleeve, a first gear and a second gear, the first transmission sleeve is coaxially sleeved outside an inner knife tube, and the first transmission sleeve is used for driving the inner knife tube to rotate or reciprocate along the axis direction of an outer knife tube; the first gear is relatively and fixedly arranged on the first transmission sleeve in a sleeving manner and is coaxial with the inner cutter tube, so that the first gear and the first transmission sleeve synchronously rotate; the second gear at least partially sleeves the first transmission sleeve and can rotate relative to the first transmission sleeve, and the first transmission sleeve and the second gear are in clearance fit to restrain the coaxiality of the first transmission sleeve and the second gear; one of the first gear and the second gear is a rotating gear used for driving the inner knife tube to rotate, and the other gear of the first gear and the second gear is a moving gear used for driving the inner knife tube to reciprocate in the axis direction of the outer knife tube. And by improving the coaxiality of the first transmission sleeve and the second gear, the stability during use is ensured.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the biopsy equipment technical field, especially, a kind of rotary biopsy needle. BACKGROUND

[0002] Biopsy needle is a kind of medical instrument for obtaining cell sample or tissue sample from patient's body, suitable for kidney, liver, lung, breast, thyroid, prostate, pancreas, testis, uterus, ovary, body surface and various organs, since it has the advantages of small surgical trauma, small scar left, good postoperative healing etc., and the inner cutter tube of vacuum-assisted rotary biopsy needle can translate and rotate in outer cutter tube, the effect of cutting tissue is good and efficient, and it has been widely used in clinical medical operation. In order to provide the power for rotation and translation of inner cutter tube, biopsy needle needs to be installed on biopsy handle, and biopsy handle is provided with at least rotating power output gear and translational power output gear, and biopsy needle is provided with rotating gear for driving inner cutter tube to rotate and moving gear for driving inner cutter tube to translate, rotating power output gear and rotating gear are engaged, and translational power output gear and moving gear are engaged, so that the power provided by biopsy handle can drive inner cutter tube to translate and rotate.

[0003] In the existing biopsy needle, two transmission sleeves are provided on the outer sleeve of the inner cutter tube, and the moving gear and the rotating gear are correspondingly arranged on the corresponding transmission sleeves to transmit the power to the inner cutter tube through the corresponding transmission sleeves. However, after the existing rotary biopsy needle is assembled with the biopsy handle, if the inner cutter tube needs to rotate and advance and retreat at the same time, the inner cutter tube may occasionally be stuck, the power cannot be smoothly transmitted to the inner cutter tube, and the stability and safety of the operation are affected. UTILITY MODEL CONTENTS

[0004] In view of the above-mentioned shortcomings of the prior art, the purpose of the utility model is to provide a rotary biopsy needle, which is used to solve the problem that, after the rotary biopsy needle is assembled with the biopsy handle, if the inner cutter tube needs to rotate and advance and retreat at the same time, the inner cutter tube may occasionally be stuck, and the power cannot be smoothly transmitted to the inner cutter tube.

[0005] To achieve the above-mentioned purpose and other related purposes, the utility model provides a rotary biopsy needle, which comprises an outer cutter tube and an inner cutter tube arranged in the outer cutter tube, and further comprises:

[0006] A first transmission sleeve is coaxially arranged outside the inner cutter tube, and is used to drive the inner cutter tube to rotate or reciprocate along the axis direction of the outer cutter tube;

[0007] A first gear is fixedly arranged on the first transmission sleeve and coaxial with the inner cutter tube, so that the first gear rotates synchronously with the first transmission sleeve;

[0008] a second gear, the second gear being at least partially sleeved on the first transmission sleeve and being rotatable relative to the first transmission sleeve, the first transmission sleeve and the second gear being gap-fitted to constrain coaxiality of the first transmission sleeve and the second gear;

[0009] wherein one of the first gear and the second gear is a rotating gear for driving the inner cutter tube to rotate, and the other of the first gear and the second gear is a moving gear for driving the inner cutter tube to reciprocate along the axial direction of the outer cutter tube.

[0010] Optionally, the rotary biopsy needle further comprises a second transmission sleeve, and the second gear is relatively fixedly sleeved on the second transmission sleeve.

[0011] In the first transmission sleeve and the second transmission sleeve, the transmission sleeve relatively fixedly connected with the rotating gear is a rotating transmission sleeve, and the other transmission sleeve is a moving transmission sleeve, and the rotating transmission sleeve is sleeved between the inner cutter tube and the moving transmission sleeve in the radial direction.

[0012] Optionally, the second transmission sleeve is fixedly sleeved outside the inner cutter tube and rotates synchronously with the inner cutter tube, the first transmission sleeve is rotatably sleeved outside the second transmission sleeve, the first gear is a moving gear, and the second gear is a rotating gear.

[0013] Optionally, the first transmission sleeve is fixedly sleeved outside the inner cutter tube and rotates synchronously with the inner cutter tube, the second transmission sleeve is rotatably sleeved outside the first transmission sleeve, the first gear is a rotating gear, and the second gear is a moving gear.

[0014] Optionally, the second gear is provided with a stepped hole along a center line thereof, one stepped surface of the stepped hole faces the first gear, the second transmission sleeve at least partially penetrates the stepped hole, and the first transmission sleeve has a limiting portion inserted into the stepped hole and facing the one stepped surface of the stepped hole.

[0015] Optionally, a torque transmission structure is arranged between the rotating transmission sleeve and the inner cutter tube, and a transmission mechanism is arranged between the moving transmission sleeve and the inner cutter tube, the transmission mechanism being used for converting rotational movement of the moving transmission sleeve into linear movement of the inner cutter tube.

[0016] Optionally, an insertion cavity is configured between an inner wall of the rotating transmission sleeve and an outer wall of the inner cutter tube, the torque transmission structure comprises a fixed sleeve, a transmission key and a transmission groove, the fixed sleeve is coaxially and relatively fixedly sleeved outside the inner cutter tube, and the fixed sleeve remains at least partially inserted into the insertion cavity.

[0017] The transmission key is arranged on the fixed sleeve, the transmission groove is arranged on the rotary transmission sleeve, the transmission groove extends along the axial direction of the rotary transmission sleeve, and the transmission key is arranged in the transmission groove in a matched mode.

[0018] Optionally, the rotary biopsy needle comprises a housing, the transmission mechanism comprises a moving sleeve sleeved outside the inner cutter tube, the moving sleeve is in threaded connection with the moving transmission sleeve, a guide structure extending in the axial direction is arranged between the housing and the moving sleeve, and an axial limiting structure is arranged between the moving sleeve and the inner cutter tube, so that the inner cutter tube moves synchronously and reciprocally along the axial direction with the moving sleeve.

[0019] Optionally, the axial limiting structure comprises a fixed sleeve arranged on the inner cutter tube, a limiting piece is arranged at the distal end of the fixed sleeve, and a first limiting step arranged in the axial direction of the inner cutter tube is arranged on the outer wall of the fixed sleeve; a limiting protrusion is arranged on the inner wall of the moving sleeve, and the limiting protrusion is clamped between the first limiting step and the limiting piece in the axial direction of the inner cutter tube.

[0020] Optionally, the guide structure comprises a guide groove and a guide protrusion, the guide protrusion is arranged in the guide groove, and one of the guide groove and the guide protrusion is arranged on the housing, and the other of the guide groove and the guide protrusion is arranged on the outer wall of the moving sleeve.

[0021] As described above, the rotary biopsy needle has the following beneficial effects:

[0022] By at least partially sleeving the second gear on the first transmission sleeve and gap matching the first transmission sleeve and the second gear, the coaxiality of the first transmission sleeve and the second gear can be improved, so that the coaxiality between the first gear and the second gear is improved, which is beneficial to avoid the phenomenon that the inner cutter tube is stuck when the rotary biopsy needle and the biopsy handle are assembled into one body and the inner cutter tube needs to be rotated and advanced and retreated at the same time, and the stability and safety of the rotary biopsy needle during the operation process are improved. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 FIG. 4 is an axial sectional view of the rotary biopsy needle of an embodiment of the utility model.

[0024] Figure 2 FIG. 5 is an axial sectional view of the rotary biopsy needle of another embodiment of the utility model.

[0025] Figure 3 FIG. 6 is a schematic view of the rotary biopsy needle of another embodiment of the utility model. Figure 1 FIG. 7 is an enlarged view of position A in FIG. 6.

[0026] Figure 4 for Figure 1 sectional view of A-A.

[0027] Figure 5 for Figure 1 sectional view of B-B.

[0028] Explanation of reference numerals: a, first gear; b, second gear; c, first transmission sleeve; d, second transmission sleeve; 1, rotating gear; 2, moving gear; 3, rotating transmission sleeve; 4, moving transmission sleeve; 5, moving sleeve; 501, limiting protrusion; 502, guide groove; 6, fixed sleeve; 601, transmission key; 7, limiting member; 8, housing; 801, guide protrusion; 9, inner cutter tube; 10, plug-in cavity. DETAILED DESCRIPTION

[0029] The following specific embodiments illustrate the embodiments of the present application, and those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in the specification.

[0030] Please refer to Figures 1 to 5 It should be understood that the structures, proportions, sizes, etc. shown in the drawings attached to the specification are only used to understand and read the content disclosed in the specification for those skilled in the art, and are not used to limit the conditions that the present application can be implemented, so they do not have technical significance. Any modification of the structure, change of the proportion relationship or adjustment of the size, without affecting the effects and purposes that the present application can produce, should still fall within the scope of the technical content disclosed by the present application. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" in the specification are only for the convenience of clear description, and are not used to limit the scope of the present application, and the change or adjustment of the relative relationship without substantial change of the technical content is also considered as the scope of the present application.

[0031] It should be noted that in the following embodiments, "near" and "far" are relative distance descriptions, which can be understood on the rotary biopsy needle as follows: the distal end of the rotary biopsy needle refers to the end far away from the operator during the operation, i.e. the tip end of the rotary biopsy needle is the distal end of the rotary biopsy needle, and the proximal end of the rotary biopsy needle refers to the end close to the operator during the operation, i.e. the tail end of the rotary biopsy needle away from the tip end can be considered as the proximal end. In the following description, if a single part is described as "proximal end" or "distal end", it corresponds to the orientation of the entire biopsy device.

[0032] In order to describe the present application in detail, a rotary biopsy needle of the present application will be described in detail as follows:

[0033] Please refer to Figure 1 and Figure 2 The utility model provides a kind of rotary biopsy needle including outer cutter tube and inner cutter tube 9 being arranged in outer cutter tube, the rotary biopsy needle further includes first transmission sleeve c, first gear a and second gear b, first transmission sleeve c coaxially cover and be arranged outside inner cutter tube 9, first transmission sleeve c is used to drive inner cutter tube 9 rotation or reciprocating along the axis direction of outer cutter tube;First gear a is relatively fixedly covered on first transmission sleeve c and is coaxial with inner cutter tube 9, to make first gear a and first transmission sleeve c synchronous rotation;Second gear b is at least partially covered on first transmission sleeve c, and can be rotated relative to first transmission sleeve c, first transmission sleeve c and second gear b clearance fit to constrain the coaxiality of first transmission sleeve c and second gear b;Wherein, one gear in first gear a and second gear b is rotating gear 1 for driving inner cutter tube 9 rotation, another gear in first gear a and second gear b is moving gear 2 for driving inner cutter tube 9 reciprocating along the axis direction of outer cutter tube.By at least partially covering second gear b on first transmission sleeve c, and clearance fit with first transmission sleeve c, the coaxiality of first transmission sleeve c and second gear b can be improved, so as to improve the coaxiality between first gear a and second gear b, facilitate to ensure that power is smoothly transmitted to inner cutter tube 9, avoid the phenomenon that inner cutter tube 9 is stuck when rotary biopsy needle needs to be rotated and advanced simultaneously in operation due to the poor coaxiality between first gear a and second gear b.

[0034] Wherein, rotary biopsy needle further includes second transmission sleeve d, second gear b is relatively fixedly covered on second transmission sleeve d;In first transmission sleeve c and second transmission sleeve d, transmission sleeve fixedly connected with rotating gear 1 is rotating transmission sleeve 3, another transmission sleeve is moving transmission sleeve 4, rotating transmission sleeve 3 is covered between inner cutter tube 9 and moving transmission sleeve 4 along radial direction.This kind of structure, by relatively fixedly covering second gear b on second transmission sleeve d, while rotating transmission sleeve 3 is covered between inner cutter tube 9 and moving transmission sleeve 4 along radial direction, facilitate to keep higher coaxiality between first gear a, second gear b and inner cutter tube 9, also facilitate to smoothly transmit power to inner cutter tube 9 when inner cutter tube 9 is rotated and advanced simultaneously, ensure the fluency of inner cutter tube 9 work.

[0035] As Figure 1As shown, in this embodiment, the second transmission sleeve d is fixed outside the inner knife tube 9 and rotates synchronously with the inner knife tube 9. The first transmission sleeve c is rotatably sleeved outside the second transmission sleeve d. The first gear a is a moving gear 2, the second gear b is a rotating gear 1, the first transmission sleeve c is a moving transmission sleeve 4, and the second transmission sleeve d is a rotating transmission sleeve 3. When this structure is adopted, the above-mentioned "the second gear b is at least partially sleeved on the first transmission sleeve c" can be achieved in the following ways: the rotating gear 1 has a stepped hole along its own center line, the rotating transmission sleeve 3 passes through the stepped hole, and the end of the moving transmission sleeve 4 is inserted into the stepped hole as a limiting part and faces a stepped surface of the stepped hole. By setting a stepped hole on the rotating gear 1, the stepped hole can be fitted with the rotating transmission sleeve 3 to constrain the coaxiality of the moving transmission sleeve 4 and the rotating gear 1, thereby improving the coaxiality of the moving gear 2 and the rotating gear 1. This ensures that the power can be smoothly transmitted to the inner knife tube 9 when the rotary cutting biopsy needle is working, and avoids the inner knife tube 9 from getting stuck when it needs to rotate and move forward and backward at the same time.

[0036] like Figure 2 As shown, in another embodiment, the first transmission sleeve c is disposed outside the inner blade tube 9 and rotates synchronously with the inner blade tube 9. The second transmission sleeve d is rotatably sleeved outside the first transmission sleeve c. The first gear a is a rotary gear 1, the second gear b is a movable gear 2, the first transmission sleeve c is a rotary transmission sleeve 3, and the second transmission sleeve d is a movable transmission sleeve 4. When using this structure, the "second gear b at least partially sleeved on the first transmission sleeve c" can be achieved in the following ways: the movable gear 2 has a stepped hole along its own centerline; the rotary transmission sleeve 3 has a limiting part that protrudes radially outward along the rotary transmission sleeve 3; the limiting part is inserted into the stepped hole and faces a stepped surface of the stepped hole; the end of the movable transmission sleeve 4 extends into the stepped hole as a limiting part. The stepped hole is provided on the movable gear 2 or the rotary gear 1 and can be adjusted according to actual usage needs.

[0037] In some embodiments, see Figure 1 , Figure 2 A torque transmission structure is provided between the rotary transmission sleeve 3 and the inner cutter tube 9; a transmission mechanism is provided between the movable transmission sleeve 4 and the inner cutter tube 9. The transmission mechanism is used to convert the rotational motion of the movable transmission sleeve 4 into the linear motion of the inner cutter tube 9. Through the torque transmission structure, the rotary transmission sleeve 3 drives the inner cutter tube 9 to rotate. Through the transmission mechanism, the movable transmission sleeve 4 drives the inner cutter tube 9 to reciprocate along its axial direction. The advancing, retreating, and rotating of the inner cutter tube 9 are realized by the moving gear 2 and the rotary gear 1, respectively. The advancing, retreating, and rotating can work independently or in coordination.

[0038] For example, such as Figure 5As shown, an insertion cavity 10 is constructed between the inner wall of the rotary transmission sleeve 3 and the outer wall of the inner knife tube 9. The torque transmission structure includes a fixed sleeve 6, a transmission key 601, and a transmission groove. The fixed sleeve 6 is coaxially and relatively fixedly sleeved on the outside of the inner knife tube 9, and the fixed sleeve 6 is at least partially inserted into the insertion cavity 10. The transmission key 601 is disposed on the fixed sleeve 6, and the transmission groove is disposed on the rotary transmission sleeve 3. The transmission groove extends along the axial direction of the rotary transmission sleeve 3, and the transmission key 601 is disposed in the transmission groove. The transmission key 601 and the transmission groove can transmit torque and guide the axial reciprocating motion of the inner knife tube 9.

[0039] In detail, the rotary biopsy needle includes a housing 8, and a transmission mechanism including a movable sleeve 5 sleeved outside the inner blade tube 9. The movable sleeve 5 is threadedly connected to a movable transmission sleeve 4. An axially extending guide structure is constructed between the housing 8 and the movable sleeve 5, and an axial limiting structure is constructed between the movable sleeve 5 and the inner blade tube 9, so that the inner blade tube 9 moves synchronously back and forth along the axial direction with the movable sleeve 5. Through the threaded connection between the movable sleeve 5 and the movable transmission sleeve 4, the rotational motion of the movable transmission sleeve 4 can be converted into the linear motion of the movable sleeve 5. The movable sleeve 5 drives the inner blade tube 9 to reciprocate along its axial direction through the axial limiting structure. Due to the guide structure, it is ensured that the movable sleeve 5 drives the inner blade tube 9 to move along its axial direction. In this embodiment, the movable sleeve 5 passes through the movable transmission sleeve 4, which saves the assembly space of the rotary biopsy needle, making the assembled rotary biopsy needle smaller, and thus better suited for use in surgery.

[0040] like Figures 1 to 3 As shown, the axial limiting structure includes a fixed sleeve 6 on the inner blade tube 9, a limiting member 7 at the distal end of the fixed sleeve 6, a first limiting step axially arranged around the inner blade tube 9 on the outer wall of the fixed sleeve 6, and a limiting protrusion 501 protruding from the inner wall of the movable sleeve 5. The limiting protrusion 501 is clamped between the first limiting step and the limiting member 7 along the axial direction of the inner blade tube 9. When the movable sleeve 5 moves toward the distal end of the biopsy needle, the movable sleeve 5 drives the inner blade tube 9 toward the distal end of the biopsy needle through the limiting member 7. When the movable sleeve 5 moves toward the proximal end of the biopsy needle, the movable sleeve 5 drives the inner blade tube 9 toward the proximal end of the biopsy needle through the first limiting step.

[0041] like Figure 4 As shown in detail, the guiding structure includes a guide groove 502 and a guide protrusion 801. The guide protrusion 801 is disposed within the guide groove 502. One of the guide groove 502 and the guide protrusion 801 is located on the outer shell, and the other of the guide groove 502 and the guide protrusion 801 is located on the outer wall of the movable sleeve 5. By providing the guide groove 502 and the guide protrusion 801, the movement of the movable sleeve 5 can be guided, preventing the movable sleeve 5 from rotating when moving along the axial direction of the inner blade tube 9, thereby improving the stability of the rotary biopsy needle during operation.

[0042] In summary, by sleeving the second gear at least partially on the first transmission sleeve and in clearance fit with the first transmission sleeve, the coaxiality of the first transmission sleeve and the second gear can be improved, thereby improving the coaxiality between the first gear and the second gear, avoiding the phenomenon that the inner cutter tube 9 is stuck when the inner cutter tube 9 needs to rotate and advance and retreat at the same time after the rotary biopsy needle and the biopsy handle are assembled into one body, and improving the stability and safety of the rotary biopsy needle during the operation process.

[0043] The above embodiment only exemplarily illustrates the principle and effect of the present application, and is not used to limit the present application. Any person skilled in the art can modify or change the above embodiment without departing from the spirit and scope of the present application. Therefore, all equivalent modifications or changes completed by those skilled in the art without departing from the spirit and technical thought disclosed by the present application should be covered by the claims of the present application.

Claims

1. A rotary biopsy needle comprising an outer cutting cannula and an inner cutting cannula disposed within the outer cutting cannula, characterized by, The rotary biopsy needle further comprises: a first transmission sleeve coaxially sleeved outside the inner cutter tube, the first transmission sleeve being used to drive the inner cutter tube to rotate or reciprocate along the axial direction of the outer cutter tube; a first gear coaxially sleeved on the first transmission sleeve and fixed relative to the first transmission sleeve, so that the first gear rotates synchronously with the first transmission sleeve; a second gear at least partially sleeved on the first transmission sleeve and capable of rotating relative to the first transmission sleeve, the first transmission sleeve and the second gear being in clearance fit to constrain the coaxiality of the first transmission sleeve and the second gear; wherein one of the first gear and the second gear is a rotating gear used to drive the inner cutter tube to rotate, and the other of the first gear and the second gear is a moving gear used to drive the inner cutter tube to reciprocate along the axial direction of the outer cutter tube.

2. The rotary cutting biopsy needle of claim 1 wherein, The rotary biopsy needle further comprises a second transmission sleeve, and the second gear is fixedly sleeved on the second transmission sleeve; in the first transmission sleeve and the second transmission sleeve, the transmission sleeve fixedly connected with the rotating gear is a rotating transmission sleeve, and the other transmission sleeve is a moving transmission sleeve, and the rotating transmission sleeve is radially sleeved between the inner cutter tube and the moving transmission sleeve.

3. The rotary cutting biopsy needle of claim 2 wherein, The second transmission sleeve is fixedly sleeved outside the inner cutter tube and rotates synchronously with the inner cutter tube, the first transmission sleeve is rotatably sleeved outside the second transmission sleeve, the first gear is a moving gear, and the second gear is a rotating gear.

4. The rotary cutting biopsy needle of claim 2 wherein, The first transmission sleeve is fixedly sleeved outside the inner cutter tube and rotates synchronously with the inner cutter tube, the second transmission sleeve is rotatably sleeved outside the first transmission sleeve, the first gear is a rotating gear, and the second gear is a moving gear.

5. The rotary cutting biopsy needle of any of claims 2 to 4, wherein: The second gear is provided with a stepped hole along the center line of the second gear, one stepped surface of the stepped hole faces the first gear, the second transmission sleeve at least partially penetrates the stepped hole, and the first transmission sleeve has a limiting portion inserted into the stepped hole and facing one stepped surface of the stepped hole.

6. The rotary cutting biopsy needle of claim 2 wherein: A torque transmission structure is arranged between the rotating transmission sleeve and the inner cutter tube, and a transmission mechanism is arranged between the moving transmission sleeve and the inner cutter tube, the transmission mechanism being used to convert the rotary motion of the moving transmission sleeve into the linear motion of the inner cutter tube.

7. The rotary cutting biopsy needle of claim 6 wherein: An insertion cavity is formed between the inner wall of the rotating transmission sleeve and the outer wall of the inner cutter tube, the torque transmission structure comprises a fixed sleeve, a transmission key and a transmission groove, the fixed sleeve is coaxially and fixedly sleeved outside the inner cutter tube, and the fixed sleeve at least partially inserts into the insertion cavity; wherein the transmission key is arranged on the fixed sleeve, the transmission groove is arranged on the rotating transmission sleeve, the transmission groove extends along the axial direction of the rotating transmission sleeve, and the transmission key is arranged in the transmission groove in a matched manner; or, the transmission key is arranged on the rotating transmission sleeve, the transmission groove is arranged on the fixed sleeve, the transmission groove extends along the axial direction of the fixed sleeve, and the transmission key is arranged in the transmission groove in a matched manner.

8. The rotary cutting biopsy needle of claim 6 wherein: The rotary biopsy needle comprises a housing, the transmission mechanism comprises a moving sleeve sleeved outside the inner cutter tube, the moving sleeve is threadedly connected with the moving transmission sleeve, a guide structure extending in the axial direction is arranged between the housing and the moving sleeve, and an axial limiting structure is arranged between the moving sleeve and the inner cutter tube, so that the inner cutter tube reciprocates along the axial direction synchronously with the moving sleeve.

9. The rotary cutting biopsy needle of claim 8 wherein: The axial limiting structure comprises a fixed sleeve fixed on the inner cutter tube, the distal end of the fixed sleeve is provided with a limiting piece, the outer wall of the fixed sleeve is provided with a first limiting step arranged in the axial direction of the inner cutter tube, and the inner wall of the moving sleeve is provided with a limiting protrusion, the limiting protrusion is clamped between the first limiting step and the limiting piece in the axial direction of the inner cutter tube.

10. The rotary cutting biopsy needle of claim 8 wherein: The guide structure comprises a guide groove and a guide protrusion, the guide protrusion is arranged in the guide groove, one of the guide groove and the guide protrusion is arranged on the housing, and the other of the guide groove and the guide protrusion is arranged on the outer wall of the moving sleeve.

Images