Needle withdrawing mechanism of implantation tool and implantation tool

Abstract

The utility model provides a needle withdrawing mechanism of an implantation tool. The needle withdrawing mechanism comprises a shell, a push shooting piece, an implantation needle assembly and a limiting block, the push shooting piece is buckled on the shell; the pushing and shooting piece comprises a pushing and shooting piece body and a pushing and shooting piece buckling part, and the pushing and shooting piece buckling part and the pushing and shooting piece body jointly define a needle locking cavity; the implantation needle assembly comprises a needle cap, an implantation needle and a needle withdrawing driving part, one end of the implantation needle is connected with the needle cap, the other end of the implantation needle extends out of the push-shooting part, and the needle withdrawing driving part is connected with the needle cap; the limiting block is buckled on the shell; the limiting block abuts against the push-injection piece buckling part and limits the position of the push-injection piece buckling part so that the needle head cap can be buckled into the needle locking cavity through the push-injection piece buckling part. And after the pushing and shooting piece is tripped from the shell, the buckling part of the pushing and shooting piece can be separated from the limiting block, so that the needle withdrawing driving piece drives the implantation needle to withdraw. Meanwhile, the utility model further provides an implanting tool. Compared with the prior art, the needle withdrawing mechanism of the implanting tool and the implanting tool provided by the utility model can reduce the assembling difficulty.

Description

Technical Field

[0001] The utility model relates to the technical field of medical auxiliary equipment, in particular to a needle withdrawal mechanism of an implantation tool and the implantation tool. Background Art

[0002] The CGM system is a system used to monitor the blood sugar index of the human body. The CGM system in the prior art is to implant a blood sugar sensor under the skin. The enzyme on the sensor reacts with the subcutaneous tissue fluid to detect the blood sugar value, and the blood sugar value is sent to the terminal with the help of a transmitter, so that continuous blood sugar values ​​can be collected. For the CGM system, the implantation tool for implanting the blood sugar sensor is one of the indispensable devices. The implantation tool can be used to simply and quickly implant the blood sugar sensor and the transmitter into the human body.

[0003] After the implantation tool is used, in order to prevent the implantation needle from accidentally injuring people, a needle withdrawal mechanism is usually provided in the implantation tool. As shown in the publication number CN214595850U, the needle withdrawal mechanism of the implantation tool in the prior art is to set a slider in the ejection piece, and realize the needle withdrawal operation by sliding the slider. When the user uses the implantation tool, he presses the button to disengage the ejection piece. After the ejection piece slides to a certain distance, the slider is blocked and moves relative to the ejection piece, so that the slider is separated from the buckle part of the ejection piece, so that the buckle part of the ejection piece loses the resistance on the outside, and then the needle withdrawal spring drives the implantation needle back through its own elastic restoring force, thereby avoiding the exposure of the implantation needle.

[0004] However, the needle withdrawal mechanism of the implant tool in the prior art is difficult to assemble, and the slider is very likely to slide accidentally during the assembly process, which increases the difficulty of assembling the implant tool.

[0005] Therefore, how to provide a new needle withdrawal mechanism for an implant tool to reduce the difficulty of assembling the implant tool is a problem that needs to be solved urgently in the art. Utility Model Content

[0006] In view of the technical problem that the needle withdrawal mechanism of the implant tool in the prior art realizes the needle withdrawal through a slider arranged in the ejection piece, which is difficult to assemble and increases the difficulty of assembling the implant tool, the present invention provides a needle withdrawal mechanism for the implant tool, which installs the limit block buckle used to squeeze the buckle part of the ejection piece on the shell, so that during the assembly process, the accurate positioning of the components can be better ensured; and during assembly, all the parts arranged on the ejection piece can be assembled before being installed in the shell, and then the assembled components can be installed in the shell as a whole, which can make the assembly of the implant tool simpler and more convenient.

[0007] A needle withdrawal mechanism for an implantation tool, comprising a housing, a push piece, an implantation needle assembly, and a limit block;

[0008] The housing is provided with a receiving space with an opening at one end;

[0009] The ejection member is received in the accommodation space and buckled on the housing; the ejection member comprises an ejection member body and an ejection member buckle portion disposed on the ejection member body, and the ejection member buckle portion and the ejection member body together form a locking needle cavity;

[0010] The implant needle assembly comprises a needle cap, an implant needle and a needle withdrawal drive member, one end of the implant needle is connected to the needle cap and the other end extends out of the ejection member, and the needle withdrawal drive member is connected to the needle cap;

[0011] The limit block is received in the accommodating space and buckled on the housing; the limit block abuts against the buckle portion of the ejection member and limits the position of the buckle portion of the ejection member, so that the buckle portion of the ejection member buckles the needle cap in the locking needle cavity;

[0012] After the ejection member is released from the housing, the buckle portion of the ejection member can be separated from the limit block, so that the needle withdrawal drive member drives the implant needle to withdraw.

[0013] Preferably, a buckle arm is provided on the shell, a buckle slot is provided on the limit block, and the limit block is buckled on the buckle arm through the buckle slot.

[0014] Preferably, a guiding slope is provided on one side of the top of the limiting block close to the buckle arm.

[0015] Preferably, the limit block comprises a limit block body and an abutment portion;

[0016] The card slot is provided on the limit block body;

[0017] The abutting portion is arranged on the inner surface of the limiting block body and is used for abutting against the buckling portion of the ejection member.

[0018] Preferably, a detection boss is provided on the bottom surface of the limit block.

[0019] Preferably, a limiting boss is provided on the side of the limiting block.

[0020] Preferably, a process groove is provided on the limit block, the process groove extends along the length direction of the limit block, and the process groove penetrates the limit block.

[0021] Preferably, a plurality of the limit blocks are provided, and all the limit blocks are distributed in a ring shape as a whole, and each of the limit blocks abuts against a buckle portion of the ejection member.

[0022] Preferably, a first protrusion is formed on the inner surface of the buckle portion of the ejection member, and a second protrusion is formed on the outer surface of the needle cap, and the first protrusion abuts against the second protrusion.

[0023] An implantation tool, comprising a needle withdrawal mechanism, a drive button, a transmitter, and a sensor of the implantation tool;

[0024] The driving button is arranged on the housing to drive the ejection member to be released from the housing;

[0025] The launcher is detachably arranged on the ejection member;

[0026] The sensor is arranged on the transmitter.

[0027] Compared with the prior art, the needle withdrawal mechanism of the implantation tool provided by the utility model comprises a shell, a push piece, an implantation needle assembly, and a limit block; a storage space with an opening at one end is provided in the shell; the push piece is accommodated in the storage space and is buckled on the shell; the push piece comprises a push piece body and a push piece buckle portion arranged on the push piece body, and the push piece buckle portion and the push piece body together form a needle locking cavity; the implantation needle assembly comprises a needle cap, an implantation needle and a needle withdrawal drive member, and ... One end of the insertion needle is connected to the needle cap and the other end extends out of the ejection member, and the needle withdrawal drive member is connected to the needle cap; the limit block is accommodated in the accommodating space and snapped onto the shell; the limit block abuts against the snap portion of the ejection member and limits the position of the snap portion of the ejection member so that the snap portion of the ejection member snaps the needle cap into the locking needle cavity; after the ejection member is disengaged from the shell, the snap portion of the ejection member can be separated from the limit block so that the needle withdrawal drive member drives the implant needle to withdraw. In the needle withdrawal mechanism of the implant tool, the limit block is snap-fitted onto the shell, which can better prevent the limit block from accidentally moving during the assembly process and ensure that the limit block can be installed in the required position area; and when this structure is assembled, all the parts set on the ejection member can be assembled before being loaded into the shell, and then the assembled components are loaded into the shell as a whole, which can make the assembly of the implant tool simpler and more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1A schematic diagram of the cross-sectional structure of an implantation tool provided in an embodiment when not triggered;

[0030] Figure 2 for Figure 1 A schematic diagram of the cross-sectional structure of the implant tool after being triggered;

[0031] Figure 3 for Figure 1 A schematic diagram of the cross-sectional structure of the implantation tool when the limit block abuts against the buckle portion of the ejection member;

[0032] Figure 4 for Figure 1 A schematic diagram of the cross-sectional structure of the implantation tool when the limit block and the buckle part of the ejection piece are separated;

[0033] Figure 5 for Figure 1 A schematic diagram of a cross-sectional structure at another angle when the limiting block in the implant tool abuts against the buckle portion of the ejection member;

[0034] Figure 6 for Figure 1 The schematic diagram of the cross-sectional structure at another angle when the limit block and the buckle part of the ejection piece in the implant tool are separated. DETAILED DESCRIPTION

[0035] In order to enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0036] It should be noted that when a component is referred to as being "fixed on", "installed on" or "set on" another component, it can be directly on the other component or indirectly set on the other component; when a component is "connected" to another component, or a component is referred to as being "connected to" another component, it can be directly connected to the other component or indirectly connected to the other component.

[0037] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0038] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, "multiple" and "several" mean two or more, unless otherwise clearly and specifically defined.

[0039] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the conditions under which this application can be implemented. Therefore, they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed in this application without affecting the effects and purposes that can be achieved by this application.

[0040] The utility model provides a needle withdrawal mechanism for an implantation tool, which comprises a shell, a push piece, an implantation needle assembly, and a limit block; a storage space with an opening at one end is provided in the shell; the push piece is accommodated in the storage space and is snapped on the shell; the push piece comprises a push piece body and a push piece snapping part arranged on the push piece body, and the push piece snapping part and the push piece body together form a needle locking cavity; the implantation needle assembly comprises a needle cap, an implantation needle, and a needle withdrawal driving part, and the implantation needle is One end is connected to the needle cap and the other end extends out of the ejection piece, and the needle withdrawal drive is connected to the needle cap; the limit block is accommodated in the accommodating space and snapped onto the shell; the limit block abuts against the snapping part of the ejection piece and limits the position of the snapping part of the ejection piece so that the snapping part of the ejection piece snaps the needle cap into the locking needle cavity; after the ejection piece is disengaged from the shell, the snapping part of the ejection piece can be separated from the limit block so that the needle withdrawal drive drives the implant needle to withdraw. In the needle withdrawal mechanism of the implant tool, the limit block is snap-fitted onto the shell, which can better prevent the limit block from accidentally moving during the assembly process and ensure that the limit block can be installed in the required position area; and this structure can assemble all the parts set on the ejection piece before being loaded into the shell, and then the assembled components are loaded into the shell as a whole, which can make the assembly of the implant tool simpler and more convenient.

[0041] Please refer to Figures 1 to 6 The present embodiment provides a needle withdrawal mechanism 100 for an implantation tool, which includes a housing 10, a pusher 20, an implantation needle assembly 30, and a stopper 40. The housing 10 is provided with a receiving space 12 having an opening 11 at one end.

[0042] The ejection member 20 is received in the accommodation space 12 and buckled on the housing 10. The ejection member 20 includes an ejection member body 21 and an ejection member buckle portion 22 disposed on the ejection member body 21. The ejection member buckle portion 22 and the ejection member body 21 together form a needle locking cavity 23.

[0043] The implant needle assembly 30 includes a needle cap 31, an implant needle 32 and a needle withdrawal drive member 33. One end of the implant needle 32 is connected to the needle cap 31, and the other end of the implant needle 32 extends out of the ejection member 20. The needle withdrawal drive member 33 is connected to the needle cap 31. Among them, the needle withdrawal drive member 33 refers to a component used to provide a needle withdrawal drive force to the needle cap 31. Under certain circumstances (in this embodiment, when the limit block 40 is separated from the ejection member buckle portion 22), the needle withdrawal drive member 33 can provide a driving force to the needle cap 31, thereby driving the needle cap 31 to move, and then driving the implant needle 32 to move through the needle cap 31, thereby realizing the withdrawal of the implant needle 32.

[0044] The limit block 40 is received in the accommodating space 12 and buckled on the housing 10. The limit block 40 abuts against the ejection member buckle portion 22 and limits the position of the ejection member buckle portion 22 so that the ejection member buckle portion 22 buckles the needle cap 31 in the needle locking cavity 23.

[0045] After the ejection member 20 is released from the housing 10 , the ejection member buckle portion 22 can be separated from the limit block 40 , so that the needle withdrawal drive member 33 drives the implantation needle 32 to withdraw.

[0046] Specifically, when the ejection member 20 is disengaged from the housing 10, the spring disposed inside the housing 10 will drive the ejection member 20 to move, and since the limit block 40 is buckled on the housing 10, the limit block 40 will not move at this time, thereby causing relative displacement between the ejection member 20 and the limit block 40. When the ejection member 20 moves to a certain position, the ejection member buckle portion 22 will separate from the limit block 40, and since the limit block 40 lacks the pushing force of the ejection member buckle portion 22, the pressing force of the ejection member buckle portion 22 on the needle cap 31 will be reduced, so that the needle withdrawal drive member 33 provides a driving force to drive the needle cap 31 and the implant needle 32 to move in the opposite direction, thereby completing the withdrawal of the implant needle 32.

[0047] The needle withdrawal drive member 33 may be an elastic drive member, which refers to a member that can be elastically deformed after being subjected to force, and can return to its original state after the force is reduced or disappears. In one embodiment, the needle withdrawal drive member 33 may be a spring, and the needle withdrawal drive member 33 may be disposed between the needle cap 31 and the ejection member body 21.

[0048] It can be understood that when the implant tool is not in use, the limit block 40 pushes the ejection piece buckle portion 22 so that the pressing force of the ejection piece buckle portion 22 pressing the needle cap 31 is greater than the elastic force of the needle withdrawal drive member 33, thereby ensuring that when not in use, the ejection piece buckle portion 22 can buckle the needle cap 31 in the locking needle cavity 23, thereby ensuring the normal use of the implant tool.

[0049] Preferably, in one embodiment, a buckle arm 13 is provided on the housing 10, a buckle slot 41 is provided on the limit block 40, and the limit block 40 is buckled on the buckle arm 13 through the buckle slot 41. This structure can better ensure the reliability of the buckle connection between the limit block 40 and the housing 10, and make it more convenient to assemble the limit block 40 into the housing 10.

[0050] Preferably, in one embodiment, a guide slope 42 is provided on one side of the top of the limit block 40 close to the buckle arm 13. When the limit block 40 is assembled into the housing 10, the guide slope 42 is in contact with the buckle arm 13 for guidance, so that the buckle arm 13 can be more smoothly inserted into the slot 41, further reducing the difficulty of assembling the limit block 40 into the housing 10.

[0051] Preferably, in one embodiment, the limit block 40 includes a limit block body 43 and an abutment portion 44. The slot 41 is provided on the limit block body 43, the abutment portion 44 is provided on the inner surface of the limit block body 43 (the surface close to the central axis of the housing 10), and the abutment portion 44 is used to abut against the ejection member buckle portion 22.

[0052] Preferably, in one embodiment, a detection boss 45 is provided on the bottom surface of the limit block 40. It is understandable that, since the limit block 40 is an internal component during assembly, after the limit block 40 is assembled, the position of the limit block 40 cannot be intuitively confirmed, and it cannot be intuitively judged whether the limit block 40 is assembled in place. The detection boss 45 can be used for process detection to ensure that the limit block 40 is assembled in place.

[0053] Preferably, in one embodiment, a limiting boss 46 is provided on the side of the limiting block 40. The limiting boss 46 can form a guiding and positioning function with the groove 24 on the ejection member 20. Figure 5 and Figure 6 As shown, when the ejection member 20 is disengaged and starts to slide, the ejection member 20 can be guided by the limiting boss 46. At the same time, when the ejection member 20 slides into place, the ejection member 20 can also be blocked and positioned by the limiting boss 46, ensuring that the ejection member 20 only slides to the desired position.

[0054] Preferably, in one embodiment, a process groove 47 is provided on the limit block 40. The process groove 47 extends along the length direction of the limit block 40, and the process groove 47 is arranged through the limit block 40. Specifically, the process groove 47 penetrates the limit block 40 along the thickness direction of the limit block 40. By providing the process groove 47, the molding requirements of the limit block 40 can be adapted, and when the limit block 40 is molded, deformation of parts caused by too thick glue can be avoided.

[0055] Preferably, in one embodiment, the limit blocks 40 are provided in plurality (at least two), and all the limit blocks 40 are distributed in an annular shape as a whole, that is, all the limit blocks 40 are distributed in an annular shape as a whole in the accommodating space 12. Each of the limit blocks 40 abuts against one of the ejection member buckle parts 22, that is, the ejection member 20 is provided with a plurality of the ejection member buckle parts 22, and each ejection member buckle part 22 abuts against one of the limit blocks 40 on the outside, so that the forces on each side of the needle cap 31 can be more balanced, and the needle cap 31 can be buckled in the needle lock cavity 23 more stably. Specifically, in one embodiment, two limit blocks 40 are provided, and the two limit blocks 40 are arranged opposite to each other with the central axis of the housing 10 as the center interval.

[0056] Preferably, in one embodiment, the inner surface of the ejection member buckle portion 22 (the side surface close to the central axis of the housing 10) is provided with a first protrusion 221, and the outer surface of the needle cap 31 (the side surface away from the central axis of the housing 10) is provided with a second protrusion 311, and the first protrusion 221 abuts against the second protrusion 311. This structure can better ensure that the ejection member buckle portion 22 clamps the needle cap 31.

[0057] The needle withdrawal mechanism 100 of the implant tool can simplify the assembly of the implant tool. During assembly, all parts (such as the limit block 40, the transmitter, the sensor, etc.) arranged on the ejection member 20 can be assembled before entering the shell 10, thereby solving the problem of limitations in assembly operations. Finally, the assembled components are installed into the shell 10, and the assembler completes the assembly when he hears the sound of the buckle biting.

[0058] Meanwhile, in one embodiment, an implantation tool 1000 is also provided, which includes the needle withdrawal mechanism 100, a driving button 200, a transmitter 300, and a sensor 400 of the implantation tool. The driving button 200 is arranged on the housing 10, and the driving button 200 is used to drive the ejection member 20 to be disengaged from the housing 10. That is, the state change of the ejection member 20 is driven by the driving button 200, and the driving button 200 can change the ejection member 20 from the "snapping" state to the "disengaging" state, so that the ejection member 20 is separated from the housing 10.

[0059] The transmitter 300 is detachably mounted on the ejection member 20, and the sensor 400 is mounted on the transmitter 300. The specific structure of the transmitter 300 detachably mounted on the ejection member 20 can adopt any desired structure, such as a snap connection, a threaded connection, etc., as long as the transmitter 300 can be stably fixed to the ejection member 20 when the ejection member 20 is in the snap state, so that the ejection member 20 can correspondingly drive the transmitter 300 to move after being released; and when the ejection member 20 moves to the right position, the transmitter 300 can be separated from the ejection member 20.

[0060] The above is only an implementation method of the present invention. It should be pointed out that a person skilled in the art can make improvements without departing from the inventive concept of the present invention, but these improvements are all within the protection scope of the present invention.

Claims

1. A needle withdrawal mechanism for an implantation tool, characterized in that: It includes a housing, a push piece, an implant needle assembly, and a limit block; The housing is provided with a receiving space with an opening at one end; The ejection member is received in the accommodation space and is snapped onto the housing; The ejection member comprises an ejection member body and an ejection member buckle portion arranged on the ejection member body, wherein the ejection member buckle portion and the ejection member body together form a needle locking cavity; The implant needle assembly comprises a needle cap, an implant needle and a needle withdrawal drive member, one end of the implant needle is connected to the needle cap and the other end extends out of the ejection member, and the needle withdrawal drive member is connected to the needle cap; The limit block is received in the accommodating space and buckled on the housing; the limit block abuts against the buckle portion of the ejection member and limits the position of the buckle portion of the ejection member, so that the buckle portion of the ejection member buckles the needle cap in the locking needle cavity; After the ejection member is released from the housing, the buckle portion of the ejection member can be separated from the limit block, so that the needle withdrawal drive member drives the implant needle to withdraw.

2. The needle withdrawal mechanism of the implantation tool according to claim 1, characterized in that: The housing is provided with a buckle arm, the limiting block is provided with a clamping slot, and the limiting block is buckled on the buckle arm through the clamping slot.

3. The needle withdrawal mechanism of the implantation tool according to claim 2, characterized in that: A guiding inclined surface is arranged on one side of the top of the limiting block close to the buckle arm.

4. The needle withdrawal mechanism of the implantation tool according to claim 2, characterized in that: The limit block comprises a limit block body and an abutment portion; The card slot is provided on the limit block body; The abutting portion is arranged on the inner surface of the limiting block body and is used for abutting against the buckling portion of the ejection member.

5. The needle withdrawal mechanism of the implantation tool according to claim 2, characterized in that: The bottom surface of the limit block is provided with a detection boss.

6. The needle withdrawal mechanism of the implantation tool according to claim 2, characterized in that: A limiting boss is arranged on the side of the limiting block.

7. The needle withdrawal mechanism of the implantation tool according to claim 1, characterized in that: A process groove is provided on the limit block, the process groove extends along the length direction of the limit block, and the process groove penetrates the limit block.

8. The needle withdrawal mechanism of the implantation tool according to any one of claims 1 to 7, characterized in that: There are multiple limit blocks, and all the limit blocks are distributed in a ring shape as a whole, and each limit block abuts against a buckle portion of the ejection member.

9. The needle withdrawal mechanism of the implantation tool according to claim 1, characterized in that: A first protrusion is formed on the inner surface of the buckle portion of the ejection member, and a second protrusion is formed on the outer surface of the needle cap, and the first protrusion abuts against the second protrusion.

10. An implantation tool, characterized in that: The implantation tool comprises a needle withdrawal mechanism, a drive button, a transmitter, and a sensor as claimed in any one of claims 1 to 9; The driving button is arranged on the housing to drive the ejection member to be released from the housing; The launcher is detachably arranged on the ejection member; The sensor is arranged on the transmitter.

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