Pen-injector
By introducing a locking mechanism and identification element into the pen injector, the problems of misoperation and usage status recognition are solved, achieving the effects of preventing drug waste and facilitating use.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-30
- Publication Date
- 2026-03-20
AI Technical Summary
Existing pen injectors lack locking mechanisms, making them prone to accidental triggering and resulting in medication waste. Furthermore, it is difficult to distinguish whether an injection has been used after injection, increasing the treatment burden on patients.
A pen-type injector with a locking mechanism and an identification element was designed. The locking mechanism prevents accidental operation, and the identification element changes its state after injection to facilitate the identification of usage. Combined with a feedback mechanism, it provides tactile and sound signals.
It effectively prevents misuse, reduces drug waste, makes it easier for patients to identify whether the syringe has been used, and improves the safety and convenience of use.
Smart Images
Figure CN120884774B_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the field of syringes, in particular to a pen syringe. BACKGROUND
[0002] A pen syringe (also known as an injection pen) is an injection device integrating drug storage and injection functions, and is named after its appearance similar to a writing pen. The pen syringe is designed for patients who need long-term self-administration (such as diabetic patients), and is popular among patients who need long-term self-administration due to its advantages of precise drug delivery, convenient operation, and easy portability.
[0003] The existing pen syringe has the following problems: 1. In order to simplify the operation, most pen syringes do not have a locking device, which may cause the patient to accidentally trigger the pen syringe, resulting in waste of drugs and increasing the patient's treatment burden; 2. After the existing pen syringe completes injection, the patient cannot distinguish whether the pen syringe in his hand has been used within a short period of time, which may cause the patient to dispose the pen syringe incorrectly, resulting in waste of drugs. SUMMARY
[0004] The purpose of the present application is to provide a pen syringe that can prevent accidental operation and facilitate the patient to distinguish whether it has been used.
[0005] Technical solution: define the end of the pen syringe for injection as the injection end, and the other end for hand holding as the holding end. The firing unit is used to press the end of the drug container for injection as the firing end.
[0006] The pen syringe described in the present application comprises a pen body and an injection mechanism. The interior of the pen body is provided with a medicine bin for accommodating a drug container. The injection mechanism comprises an injection push rod. The injection push rod and the medicine bin are distributed along the axial direction of the pen body. The injection push rod can move towards the medicine bin to push out the drug in the drug container.
[0007] It also comprises a locking mechanism configured to lock and unlock the injection push rod along the axial direction of the pen body. After the injection push rod is unlocked, it can move towards the medicine bin. In addition,
[0008] An identification member is connected to the pen body and linked to the locking mechanism. When the pen syringe is not injecting medicine, the identification member is in a ready-to-inject state capable of moving along the axial direction of the pen body. After the identification member moves a preset stroke, the identification member can drive the locking mechanism to unlock the injection push rod. After the pen syringe injects medicine, the identification member is in an injected state locked by the locking mechanism.
[0009] Furthermore, the injection mechanism also includes a top cover, which is disposed at the holding end of the pen body. An injection driving component abuts between the injection push rod and the top cover. When the injection push rod is locked by the locking mechanism, the injection driving component is in a charged state. When the injection push rod is unlocked by the locking mechanism, the injection driving component pushes the injection push rod toward the drug cartridge.
[0010] Furthermore, the locking mechanism includes a push rod sleeve, which is sleeved on the outside of the injection push rod. The push rod sleeve is provided with at least one push rod deformation claw, and the push rod deformation claw is provided with a locking part for locking the injection push rod.
[0011] The push sleeve deformation claw can deform to the state where the locking part locks the injection push rod under the action of external force, and can also reset to the state where the locking part unlocks the injection push rod after the external force is removed.
[0012] Furthermore, the locking mechanism also includes a sliding sleeve, which is slidably sleeved on the outer wall of the push rod sleeve along the axial direction of the pen body;
[0013] The sliding sleeve has a locked position and a released position. When the sliding sleeve is in the locked position, the sliding sleeve presses against the push sleeve deformable claw to lock the injection push rod. When the sliding sleeve is in the released position, the sliding sleeve releases the pressure on the push sleeve deformable claw to unlock the injection push rod.
[0014] Furthermore, one end of the sliding sleeve has an expansion portion arranged in a conical shape. When the sliding sleeve is in the released position, the expansion portion corresponds to the position of the push sleeve deformation claw to relieve the pressure on the push sleeve deformation claw.
[0015] Furthermore, the identification element is a needle protector sleeve disposed at the injection end of the pen body. The end of the needle protector sleeve furthest from the injection end abuts against the sliding sleeve. When the needle protector sleeve abuts against the injection site, it pushes the sliding sleeve from a locked position to a released position. The functions of the needle protector sleeve are as follows: 1. To prevent the pre-filled injection needle from being directly exposed and potentially injuring the patient after the patient removes the pen cap; 2. To push the sliding sleeve from a first position to a second position during injection, releasing the lock on the injection plunger to complete the injection.
[0016] Furthermore, the identification component is a needle protective sleeve disposed on the injection end of the pen body, and the side wall of the push rod sleeve is provided with at least one self-locking component. The self-locking component can move inward to the push rod sleeve to a clearance position to avoid the needle protective sleeve in the injection state. The self-locking component can also move outward to the push rod sleeve to a stop position to lock the needle protective sleeve after stopping it.
[0017] Further, a self-locking sleeve is arranged in the cavity of the push rod sleeve, the self-locking sleeve is linked with the injection push rod, an outer wall of the self-locking sleeve is provided with a self-locking pushing part corresponding to the self-locking part, and the self-locking pushing part can push the self-locking part in the push rod sleeve to a position protruding from the push rod sleeve after the injection push rod moves a preset stroke towards the medicine cartridge.
[0018] Further, a feedback mechanism is further included, and the feedback mechanism is configured to generate a sound signal and / or a tactile signal at the end of injection of the pen-type injector.
[0019] Further, the feedback mechanism includes a first feedback part, a second feedback part and a trigger assembly, the first feedback part is connected to the pen body, the second feedback part is located on a side of the first feedback part close to an injection end of the pen body, and the second feedback part can slide along an axial direction of the pen body.
[0020] The trigger assembly includes an urging part and a trigger part, the urging part is used to apply an action force to the second feedback part towards the first feedback part, the trigger part is linked with the injection push rod, and the trigger part has a first working state of stopping the movement of the second feedback part towards the first feedback part and a second working state of releasing the stop of the second feedback part.
[0021] When the pen-type injector is at the end of injection, the injection push rod drives the trigger part to switch from the first working state to the second working state, so that the second feedback part hits the first feedback part under the action of the urging part to generate a sound signal and / or a tactile signal.
[0022] Further, the second feedback part slides through the inside of the locking mechanism, an outer wall of the second feedback part is provided with a plurality of limiting parts, and a side of the limiting parts close to the medicine cartridge is in abutment with the locking mechanism.
[0023] Further, the trigger part penetrates through the inside of the second feedback part, and the trigger part is provided with a stop part capable of moving along a radial direction of the trigger part.
[0024] When the trigger part is in the first working state, the stop part protrudes from the trigger part, and a side of the stop part close to the medicine cartridge is in abutment with the second feedback part.
[0025] When the trigger part is in the second working state, the stop part is deformed towards the inside of the trigger part to release the stop of the second feedback part, so that the second feedback part moves towards the first feedback part.
[0026] Further, the stopper is an elastic arm connected to the trigger, an abutting slope is arranged on the side of the elastic arm away from the first feedback piece, the abutting slope abuts against the second feedback piece, and the abutting slope is used for guiding the movement of the elastic arm to the inside of the trigger.
[0027] Further, the first feedback piece is arranged in a plate shape, the second feedback piece is arranged in a ring shape, and a plurality of notches are arranged on the top of the second feedback piece along the circumference thereof.
[0028] 1. Under the action of the same impact force, the notches reduce the area of the contact area between the second feedback piece and the first feedback piece, thereby increasing the pressure of the contact area when impacting, and more easily exciting the first feedback piece to vibrate, generating vibration feedback, reminding the patient that the injection has been completed; 2. After the notches are arranged, the mechanical properties when impacting are changed, the sound generated by impacting can be increased to a certain extent, and the effect of generating obvious sound feedback is achieved.
[0029] Advantages: Compared with the prior art, the present application has the following obvious advantages: 1. When the cap is not removed, the injection push rod is locked by the locking mechanism, so that the injection push rod cannot slide along the axial direction, and therefore the injection of medicine cannot be realized by accidentally touching any position of the present application, thereby preventing the waste of medicine and increasing the treatment burden of the patient;
[0030] 2. After the injection is completed, the identification piece is in the injected state locked by the locking mechanism, and the identification piece cannot slide along the axial direction again, thereby facilitating the patient to identify whether the pen-type injector in hand has been used. BRIEF DESCRIPTION OF DRAWINGS
[0031] Figure 1 It is a perspective view of the first embodiment of the pen-type injector of the present application.
[0032] Figure 2 It is an exploded view of the first embodiment of the pen-type injector of the present application.
[0033] Figure 3 It is a perspective view of the first embodiment of the pen-type injector of the present application after the pen body and the cap are hidden when not in use.
[0034] Figure 4 It is a top view of the first embodiment of the pen-type injector of the present application after the pen body is hidden.
[0035] Figure 5 It is a sectional view of the first embodiment of the pen-type injector of the present application along the A-A direction when not in use. Figure 4
[0036] Figure 6 Figure 1 is a perspective view of a first embodiment of the pen-type syringe of the present application with the pen body removed and the needle just inserted into the skin. Figure 4 Figure 2 is a cross-sectional view taken along the line B-B of Figure 1.
[0037] Figure 7 Figure 3 is an enlarged view of the detail at C. Figure 5
[0038] Figure 8 Figure 4 is a perspective view of the first embodiment of the pen-type syringe of the present application with the pen body removed and the needle just inserted into the skin.
[0039] Figure 9 Figure 5 is a cross-sectional view taken along the line A-A of Figure 4. Figure 4
[0040] Figure 10 Figure 6 is an enlarged view of the detail at D. Figure 9
[0041] Figure 11 Figure 7 is a cross-sectional view taken along the line B-B of Figure 6. Figure 4
[0042] Figure 12 Figure 8 is an enlarged view of the detail at E. Figure 11
[0043] Figure 13 Figure 9 is a cross-sectional view taken along the line A-A of Figure 8. Figure 4
[0044] Figure 14 Figure 10 is an enlarged view of the detail at F. Figure 13
[0045] Figure 15 Figure 11 is a cross-sectional view taken along the line A-A of Figure 10. Figure 4
[0046] Figure 16 Figure 12 is an enlarged view of the detail at G. Figure 15
[0047] Figure 17 Figure 13 is a cross-sectional view taken along the line A-A of Figure 12. Figure 4
[0048] Figure 18 Figure 14 is an enlarged view of the detail at H. Figure 17
[0049] Figure 19 A sectional view taken along the B-B direction of the first embodiment of the pen-type syringe of the present application after the completion of the injection sleeve reset after hiding the pen body rearward. Figure 4
[0050] A perspective view of the cap of the first embodiment of the pen-type syringe of the present application. Figure 20
[0051] A perspective view of the pen body of the first embodiment of the pen-type syringe of the present application. Figure 21
[0052] A perspective view of the top cover of the first embodiment of the pen-type syringe of the present application. Figure 22
[0053] A perspective view of the needle protection sleeve of the first embodiment of the pen-type syringe of the present application. Figure 23
[0054] A perspective view of the medicine container of the first embodiment of the pen-type syringe of the present application. Figure 24
[0055] A sectional view of the medicine container of the first embodiment of the pen-type syringe of the present application. Figure 25
[0056] A perspective view of the medicine cartridge of the first embodiment of the pen-type syringe of the present application. Figure 26
[0057] A perspective view of the injection push rod of the first embodiment of the pen-type syringe of the present application. Figure 27
[0058] A sectional view of the injection push rod of the first embodiment of the pen-type syringe of the present application. Figure 28
[0059] A perspective view of the injection sleeve of the first embodiment of the pen-type syringe of the present application. Figure 29
[0060] A sectional view of the injection sleeve of the first embodiment of the pen-type syringe of the present application. Figure 30
[0061] A perspective view of the first push rod sleeve of the first embodiment of the pen-type syringe of the present application. Figure 31
[0062] A sectional view of the first push rod sleeve of the first embodiment of the pen-type syringe of the present application. Figure 32
[0063] A perspective view of the self-locking sleeve of the first embodiment of the pen-type syringe of the present application. Figure 33
[0064] A sectional view of the self-locking sleeve of the first embodiment of the pen-type syringe of the present application.Figure 34 Figure 7 is a cross-sectional view of the self-locking sleeve from one angle for the first embodiment of the pen-type syringe of the present application.
[0065] Figure 35 Figure 8 is a cross-sectional view of the self-locking sleeve from another angle for the first embodiment of the pen-type syringe of the present application.
[0066] Figure 36 Figure 9 is a perspective view of the second feedback member for the first embodiment of the pen-type syringe of the present application.
[0067] Figure 37 Figure 10 is a combined cross-sectional view of the second push rod sleeve, the second self-locking sleeve and the cap in the first working state for the second embodiment of the pen-type syringe of the present application.
[0068] Figure 38 Figure 11 is a combined cross-sectional view of the second push rod sleeve, the second self-locking sleeve and the cap after feedback is generated for the second embodiment of the pen-type syringe of the present application.
[0069] Wherein: 1, cap; 2, pen body; 201, observation window; 3, injection spring; 4, cap; 401, guide column; 5, needle protection sleeve; 6, drug container; 601, injection sheath; 602, piston; 603, pre-filled main body; 7, cartridge; 8, injection push rod; 801, push rod locking groove; 802, injection push plate; 803, driving groove; 9, sliding sleeve; 901, spring support seat; 902, elastic self-locking claw; 10, outer spring; 11, first push rod sleeve; 1101, first push sleeve deformation claw; 1102, first locking inner protrusion; 1103, first self-locking deformation part; 1104, first self-locking groove; 1105, first self-locking guide block; 1106, first needle tube support seat; 1107, first self-locking guide groove; 1108, first limiting groove; 12, first self-locking sleeve; 1201, first self-locking pushing part; 1202, first self-locking step; 1203, first sleeve self-locking block; 1204, first self-locking inner moving block; 1205, first self-locking guide block; 13, second feedback member; 1301, spring ear; 1302, positioning groove; 14, second push rod sleeve; 1401, second push sleeve deformation claw; 1402, second locking inner protrusion; 1403, second self-locking deformation part; 1404, second self-locking groove; 1405, second self-locking guide block; 1406, second needle tube support seat; 1407, second limiting groove; 15, second self-locking sleeve; 1501, second self-locking pushing part; 1502, second self-locking step; 1503, second sleeve self-locking block; 1504, second hysteresis block. DETAILED DESCRIPTION
[0070] The technical solutions of the present application are further described below in conjunction with the drawings.
[0071] Example 1
[0072] Referring to the drawings Figures 1-36 The embodiment provides a pen-type injector, which comprises a hollow pen body 2, an injection mechanism, a locking mechanism, a feedback mechanism and a recognition member, one end of the pen body 2 is an injection end, the other end is a holding end, the holding end is connected with a top cover 4, and the feedback mechanism is arranged in the pen body 2.
[0073] Optionally, a medicine bin 7 is arranged at one end of the pen body 2 close to the injection end, the medicine bin 7 is used for placing a medicine container 6, the medicine container 6 comprises a pre-filled main body 603 used for containing medicine, a piston 602 is arranged in the pre-filled main body 603 in a sliding mode, an injection needle is arranged at the injection end of the pre-filled main body 603, and the injection needle is externally sleeved with an injection sheath 601. An observation window 201 used for observation is formed in the medicine bin 7.
[0074] Optionally, the injection mechanism comprises an injection push rod 8, the injection push rod 8 and the medicine bin 7 are distributed along the axial direction of the pen body 2, the injection push rod 8 can move towards the medicine bin 7 to push out the medicine in the medicine container 6, the injection push rod 8 is located between the medicine bin 7 and the top cover 4, and an injection driving member is arranged between the injection push rod 8 and the top cover 4, the injection driving member in the embodiment is an injection spring 3, the injection spring 3 is used for applying an action force away from the top cover 4 to the injection push rod 8, so that the injection push rod 8 is driven to slide along the axial direction of the pen body 2 in the injection process, the piston 602 in the pre-filled main body 603 is pushed, and the medicine is output. Specifically, the injection push rod 8 is hollow, a plurality of injection push plates 802 are arranged on the inner wall of the injection push rod 8, the injection spring 3 is arranged in the cavity of the injection push rod 8, one end of the injection spring 3 is in abutment with the top cover 4, and the other end of the injection spring 3 is in abutment with the injection push plate 802. The injector further comprises a guide column 401, one end of the guide column 401 is fixedly connected with the top cover 4, and the injection spring 3 is sleeved outside the guide column 401. Of course, in some other embodiments, the injection driving member can also be a tension spring, an air bag or other components capable of applying an axial force.
[0075] Optionally, the locking mechanism comprises a first push rod sleeve 11 and a sliding sleeve 9, the first push rod sleeve 11 is sleeved outside the injection push rod 8, and the sliding sleeve 9 is sleeved outside the first push rod sleeve 11 in a sliding mode. Two first push sleeve deformation claws 1101 are arranged on the first push rod sleeve 11, the two first push sleeve deformation claws 1101 are uniformly arranged with the center axis as the center, each first push sleeve deformation claw 1101 is provided with a locking portion used for locking the injection push rod 8, further, the sliding sleeve 9 has a locking position and a release position, when the sliding sleeve 9 is in the locking position, the sliding sleeve 9 presses the first push sleeve deformation claw 1101 to make the first locking inner protrusion 1102 lock the injection push rod 8, and when the sliding sleeve 9 is in the release position, the sliding sleeve 9 releases the pressing on the first push sleeve deformation claw 1101 to make the locking portion unlock the injection push rod 8.
[0076] Specifically, the locking part in the embodiment is the first locking inner protrusion 1102, and the injection push rod 8 is provided with a plurality of push rod locking grooves 801 for cooperating with the first locking inner protrusion 1102 to lock the injection push rod 8; the first push sleeve deformation claw 1101 can be deformed under the action of an external force to a state of locking the injection push rod 8, and can reset to a state of unlocking the injection push rod 8 after the external force is removed. The push rod locking groove 801 penetrates the side wall of the injection push rod 8. The push rod locking groove 801 can penetrate the side wall of the injection push rod 8, or can not penetrate the side wall of the injection push rod 8. The push rod locking groove 801 penetrating the side wall of the injection push rod 8 is more convenient for the first push sleeve deformation claw 1101 to lock the injection push rod 8.
[0077] Exemplarily, the first push sleeve deformation claw 1101 away from one end of the first push rod sleeve 11 (i.e. away from one end of the top cover 4) is elastically deformed away from the central axis in a natural state. The end of the sliding sleeve 9 close to the injection end has an expansion part arranged in a conical expansion shape, and the taper is greater than or equal to the angle between the first push sleeve deformation claw 1101 and the central axis in a natural state, so that when the sliding sleeve 9 slides towards the holding end, the end of the sliding sleeve 9 close to the injection end of the pen body 2 accommodates the elastically deformed first push sleeve deformation claw 1101 to release the compression of the first push sleeve deformation claw 1101. The taper greater than or equal to the angle between the first push sleeve deformation claw 1101 and the central axis in a natural state is more conducive to releasing the locking of the first push sleeve deformation claw 1101 when the sliding sleeve 9 slides towards the holding end.
[0078] Before the syringe starts to inject, the injection push rod 8 is located close to the top cover 4, at this time the sliding sleeve 9 compresses the first push sleeve deformation claw 1101 so that the first locking inner protrusion 1102 extends into the push rod locking groove 801 to lock the injection push rod 8, at this time the injection spring 3 is in a compressed state; when the syringe starts to inject, the sliding sleeve 9 slides towards the holding end by a preset stroke to release the compression of the first push sleeve deformation claw 1101, so that the first push sleeve deformation claw 1101 resets, so that the injection push rod 8 moves towards the injection end under the action of the elastic force of the injection spring 3, thereby actively injecting after unlocking.
[0079] Optionally, the top cover 4 and the pen body 2 are detachably connected by buckling, and the first push rod sleeve 11 is detachably connected with the top cover 4 by buckling, so the relative position of the first push rod sleeve 11 and the pen body 2 is fixed.
[0080] Optionally, the recognition member in the embodiment is a needle protection sleeve 5 arranged at the injection end of the pen body 2. The needle protection sleeve 5 is slidingly arranged in the hollow portion of the pen body 2. One end of the needle protection sleeve 5 away from the injection end is in abutment with the sliding sleeve 9. The other end of the needle protection sleeve 5 extends out of the injection end of the pen body 2. The needle protection sleeve 5 is hollow. The hollow portion of the needle protection sleeve 5 is used to accommodate the medicine container 6. After the injection is started, the needle protection sleeve 5 pushes the sliding sleeve 9 to move from the injection end to the holding end. When the injection site is reached, the needle protection sleeve 5 pushes the sliding sleeve 9 from the locked position to the released position.
[0081] The functions of the needle protection sleeve 5 are as follows: 1. After the patient removes the pen cap, the pre-filled injection needle is prevented from being directly exposed to the patient; 2. When the patient is injected, the sliding sleeve 9 is pushed to move from the first position to the second position, thereby releasing the locking of the injection push rod 8 to complete the injection.
[0082] Optionally, the injector further comprises a first self-locking sleeve 12. The first self-locking sleeve 12 is slidingly arranged between the first push rod sleeve 11 and the injection push rod 8. The first self-locking sleeve 12 is linked with the injection push rod 8. Specifically, the bottom of the first self-locking sleeve 12 is provided with a plurality of first self-locking inner blocks 1204. The injection push rod 8 is provided with a plurality of driving grooves 803. The first self-locking inner blocks 1204 extend into the driving grooves 803. In the embodiment, the driving grooves 803 and the push rod locking grooves 801 are arranged at intervals along the circumference of the injection push rod 8. After the driving grooves 803 are opened, the injection push rod 8 is deformed inwardly under the radial force. After the first self-locking inner blocks 1204 extend into the driving grooves 803, when the injection push rod 8 moves to a position where the first self-locking inner blocks 1204 interfere with each other, the injection push rod 8 drives the first self-locking sleeve 12 to move towards the injection end, thereby realizing the switching of the working state of the trigger member.
[0083] Optionally, the outer wall of the first self-locking sleeve 12 is provided with a plurality of first self-locking pushing portions 1201. The first push rod sleeve 11 is provided with a first self-locking deformation portion 1103. After the injection is completed (i.e., the medicine in the medicine container 6 is completely emptied), the injection push rod 8 drives the first self-locking sleeve 12 to move towards the injection end. In this process, the sliding sleeve 9 also resets towards the injection end. The first self-locking pushing portions 1201 can push the first self-locking deformation portion 1103 to protrude out of the first self-locking pushing portions 1201, thereby interfering with the sliding sleeve 9 moving towards the holding end, thereby facilitating the user to distinguish whether the injector has been used.
[0084] At this time, it should be noted that the first push sleeve deformation claw 1101 will be deformed again after the sliding sleeve 9 is reset. Since the part of the injection push rod 8 corresponding to the first locking inner protrusion 1102 has the driving groove 803, the first locking inner protrusion 1102 will press the injection push rod 8 to deform, thereby providing a space for the first locking inner protrusion 1102 to reset inwardly.
[0085] Optionally, a first self-locking groove 1104 is arranged on the first push rod sleeve 11 below the first self-locking deformation part 1103 (the direction towards the injection end is defined as below), and the outer wall of the first self-locking sleeve 12 is provided with a first self-locking step 1202 for extending into the first self-locking groove 1104.
[0086] Optionally, a first self-locking guide block 1105 is arranged at the bottom of the first self-locking pushing part 1201 for guiding the first self-locking pushing part 1201. Specifically, the guiding surface of the first self-locking guide block 1105 is arc-shaped, and the arc-shaped first self-locking guide block 1105 is more conducive to gradually pushing the first self-locking deformation part 1103 to protrude away from the central axis, so as to interfere with the sliding sleeve 9 along the axial direction of the pen body 2, thereby preventing the sliding sleeve 9 from sliding again towards the holding end.
[0087] Optionally, the sliding sleeve 9 is further provided with an elastic self-locking claw 902, and an outer spring 10 is arranged between the end of the sliding sleeve 9 close to the top cover 4 and the pen body 2. After the injection of the syringe is completed, the sliding sleeve 9 is reset to the initial position under the action of the outer spring 10, and then the elastic self-locking claw 902 interferes with the first self-locking deformation part 1103 along the central axis direction. When the first self-locking pushing part 1201 pushes the first self-locking deformation part 1103 away from the central axis until the self-locking position, during the sliding of the sliding sleeve 9 towards the injection end, the elastic self-locking claw 902 is also pushed away from the central axis and deformed due to the elasticity of the elastic self-locking claw 902, so as to not hinder the resetting of the sliding sleeve 9. After the resetting of the sliding sleeve 9, the elastic self-locking claw 902 is also reset to the initial state, and at this time, the elastic self-locking claw 902 interferes with the first self-locking deformation part 1103 along the central axis direction, thereby realizing the interference self-locking of the first self-locking deformation part 1103 and the sliding sleeve 9.
[0088] Optionally, a first needle tube support seat 1106 for supporting the abutment of the drug container 6 is arranged at the end of the first push rod sleeve 11 close to the injection end, and the connection part between the main body of the first push rod sleeve 11 and the first needle tube support seat 1106 is an elastic member. The connection part between the first push rod sleeve 11 and the first needle tube support seat 1106 being an elastic member can make the present application adapt to the support distance requirements between different specifications of drug containers 6, thereby matching various specifications of drug containers 6.
[0089] Optionally, a first self-locking guide groove 1107 for guiding the first self-locking sleeve 12 is arranged on the first push rod sleeve 11, and a first self-locking guide block 1205 is arranged on the outer wall of the first self-locking sleeve 12, the first self-locking guide block 1205 extending into the first self-locking guide groove 1107, and the first self-locking guide block 1205 plays an auxiliary guiding role when the first self-locking sleeve 12 slides relative to the first push rod sleeve 11.
[0090] The feedback mechanism is used to generate feedback when the injection is completed, and the feedback mechanism comprises a first feedback member, a second feedback member 13 and a trigger assembly, the first feedback member is fixedly connected to the inside of the pen body 2, the second feedback member 13 is spaced apart from the first feedback member along the axial direction of the pen body 2, and the second feedback member 13 can slide along the axial direction of the pen body 2; the trigger assembly comprises a force applying member and a trigger member, the force applying member is used to apply a force to the second feedback member 13 towards the first feedback member, and the trigger member has a first working state of stopping the second feedback member 13 from moving towards the first feedback member and a second working state of releasing the stop.
[0091] When the injection is in the end stage, the trigger member is switched from the first working state to the second working state, so that the second feedback member 13 hits the first feedback member under the action of the force applying member to generate a sound signal and / or a tactile signal. It should be noted that the end stage of injection refers to the stage of emptying the drug container 6 to completely empty the drug container 6, so that the trigger member is switched to the second working state before the injection is completed, and then the second feedback member 13 moves towards the first feedback member and generates a feedback signal, which is generated just after the injection is completed, thereby ensuring the accuracy of the feedback signal.
[0092] From the above, when the trigger member is in the first working state, the trigger member limits the movement of the second feedback member 13 towards the first feedback member, and the force applying member stores energy and continuously applies a force to the second feedback member 13 towards the first feedback member; when the injection is in the end stage, the trigger member is switched to the second working state, the trigger member releases the stop of the second feedback member 13, and the second feedback member 13 moves towards the first feedback member under the action of the force applying member, and then the second feedback member 13 hits the first feedback member to generate sound and / or vibration when the injection is completed, thereby improving the accuracy of the feedback; in addition, the force applying member is always storing energy when the trigger member is in the first working state, and the second feedback member 13 has a large potential energy after being released, thereby ensuring that obvious sound feedback and / or vibration feedback are generated when the second feedback member 13 is hit, so that the user can clearly perceive that the injection is completed.
[0093] In this embodiment, the first feedback member is the top cover 4, and the first feedback member will be replaced by the top cover 4 in the following further description; in some other embodiments, it can also be a separate plate-shaped component in the pen body 2. In this embodiment, the force applying member is an outer spring 10, and the outer spring 10 abuts between the second feedback member 13 and the spring support seat 901 of the sliding sleeve 9; in some other embodiments, the force applying member can also be a tension spring or an air bag, and can abut between the second feedback member 13 and the inner wall of the pen body 2. The trigger member is connected to the first self-locking sleeve 12. The stop portion is a first locking block 1203 formed on the first self-locking sleeve 12.
[0094] Optionally, the trigger is arranged inside the second feedback member 13, and a stopper is arranged on the trigger and can move along the radial direction of the trigger; the trigger is connected to the first self-locking sleeve 12 at the end close to the holding end, and the stopper is a first self-locking block 1203 integrally formed on the first self-locking sleeve 12. When the trigger is in the first working state, the first self-locking block 1203 protrudes from the trigger, and the side of the first self-locking block 1203 away from the first feedback member abuts against the second feedback member 13; when the trigger is in the second working state, the first self-locking block 1203 deforms inwardly to release the stop of the second feedback member 13, so that the second feedback member 13 moves towards the first feedback member.
[0095] Exemplarily, the first self-locking block 1203 is an elastic arm connected to the trigger, and the side of the first self-locking block 1203 away from the first feedback member is provided with an abutting inclined surface, which abuts against the second feedback member 13 and is used to guide the movement of the first self-locking block 1203 inwardly. It can be understood that, during injection, the injection push rod 8 drives the first self-locking sleeve 12 to displace towards the injection end, and when the trigger moves from the holding end of the pen body 2 to the injection end, the first self-locking block 1203 elastically deforms, so that the first self-locking block 1203 moves inwardly, and the trigger switches to the second working state.
[0096] In addition, the second feedback member 13 is provided with a positioning groove 1302 for cooperating with the first self-locking block 1203, and when the trigger is in the first working state, the first self-locking block 1203 extends into the positioning groove 1302 and abuts against the bottom of the positioning groove 1302. The bottom of the first self-locking block 1203 is provided with a first abutting inclined surface, and the bottom of the positioning groove 1302 is provided with a second abutting inclined surface for matching and abutting against the first abutting inclined surface. When the trigger is in the first working state, the first self-locking block 1203 extends into the positioning groove 1302, and the first abutting inclined surface and the second abutting inclined surface abut against each other, so as to prevent the second feedback member 13 from impacting the first feedback member; when the trigger is in the second working state, the first abutting inclined surface and the second abutting inclined surface guide the first self-locking block 1203 when the first self-locking block 1203 displaces towards the injection end, so that the first self-locking block 1203 deforms inwardly to pass through the positioning groove 1302, thereby releasing the locking of the second feedback member 13.
[0097] It should be noted that the first feedback member in the embodiment is plate-shaped, and the second feedback member 13 is annular, and a plurality of notches are formed in the top of the second feedback member 13 along the circumference thereof. The benefits of forming a plurality of notches in the top of the second feedback member 13 are as follows: 1. Under the same impact force, the notches reduce the area of the contact area between the second feedback member 13 and the first feedback member, thereby increasing the pressure of the contact area when impacted, and more easily exciting the first feedback member to vibrate, generating vibration feedback, reminding the patient that the injection has been completed; 2. The notches change the mechanical properties when impacted, and can increase the sound generated by the impact to some extent, achieving the effect of generating obvious sound feedback.
[0098] Optionally, a limiting member is further included, which can prevent the second feedback member 13 from moving away from the first feedback member during the injection process. In the embodiment, the limiting member is connected to the first push rod sleeve 11, and the following content is replaced by the first push rod sleeve 11. Specifically, the first push rod sleeve 11 is cylindrical, and the first push rod sleeve 11 is coaxially sleeved outside the second feedback member 13. A plurality of limiting portions are arranged on the outer wall of the second feedback member 13, and the limiting portion in the embodiment is a spring ear 1301, and the side of the spring ear 1301 away from the first feedback member abuts against the limiting member.
[0099] In this way, before the trigger member switches to the second working state, the second feedback member 13 is limited by the first push rod sleeve 11, that is, the trigger member does not move with the injection push rod 8 at this time, so that the distance between the second feedback member 13 and the top cover 4 is constant, and the distance between the second feedback member 13 and the top cover 4 can be kept within a small range, thereby ensuring the potential energy of the second feedback member 13 under the limited elastic force of the outer spring 10, so as to improve the feedback force, for example, to increase the feedback sound, so that the user can more easily perceive. In the embodiment, only the sound feedback is exemplified, and in some other embodiments, it can also be vibration feedback or double feedback of sound and vibration.
[0100] It should be noted that the spring ear 1301 not only abuts against the first push rod sleeve 11 to limit the second feedback member 13, but also abuts against the end of the outer spring 10 close to the second feedback member 13, thereby limiting the end of the outer spring 10.
[0101] Optionally, a first limiting groove 1108 is formed on the first push rod sleeve 11 along the axial direction of the pen body 2, and the spring ear 1301 is in sliding connection with the first limiting groove 1108, so that the second feedback member 13 is guided and limited by the cooperation of the first limiting groove 1108 and the spring ear 1301 during the movement of the second feedback member 13 towards the top cover 4. Before the trigger member switches to the second working state, the trigger member abuts against one end of the second feedback member 13 close to the holding end, and the spring ear 1301 of the second feedback member 13 interferes with the bottom of the first limiting groove 1108, thereby achieving positioning of the second feedback member 13 along the axial direction of the pen body 2, so that the bottom of the first limiting groove 1108 can prevent the second feedback member 13 from moving away from the first feedback member. As the best implementation, the spring ear 1301 is arranged at the bottom of the first limiting groove 1108.
[0102] The working process of the present application is as follows:
[0103] 1. When the present application is not in use, as shown in the figure, the sliding sleeve 9 is in the initial position, and the sliding sleeve 9 presses the first push sleeve deformation claw 1101 so that the first locking inner protrusion 1102 extends into the push rod locking groove 801 to lock the injection push rod 8; Figures 5-7
[0104] 2. When the patient needs to inject the drug, the pen cap is first removed. Since the removal of the pen cap causes the inner protrusion to be engaged with the injection sheath 601 of the drug container 6, the injection sheath 601 is also removed at the same time, thereby exposing the injection needle. The patient abuts the injection end of the needle protection sleeve 5 against the skin, and then presses the pen body 2 downward. The needle protection sleeve 5 pushes the sliding sleeve 9 to slide towards the holding end, so that the needle protection sleeve 5 will produce relative displacement with the injection needle. The injection needle pierces the skin. The state of the present application just after piercing the skin is shown in the figure. Figures 8-10
[0105] 3. During the process of the injection push rod 8 being displaced towards the injection end under the action of the injection spring 3, the first self-locking inner moving block 1204 arranged at the bottom of the first self-locking sleeve 12 slides relatively in the driven groove 803 of the injection push rod 8 until it approaches the completion of injection, as shown in the figure. Figures 10-11 As shown, the first self-locking inner moving block 1204 interferes with the groove wall of the driving groove 803, and after the interference, the injection push rod 8 drives the first self-locking sleeve 12 to move towards the injection end; before the interference between the first self-locking inner moving block 1204 and the groove wall of the driving groove 803, the elastic force of the outer spring 10 towards the holding end direction is less than or equal to the force of the first locking sleeve self-locking block 1203 pressing the positioning groove 1302, which makes the position of the second feedback member 13 along the central axis direction remain stable;
[0106] 4、As shown in Figures 12-13 When the first self-locking inner moving block 1204 interferes with the groove wall of the driving groove 803, the first self-locking sleeve 12 is driven by the injection push rod 8 to move towards the injection end, and the balance between the first self-locking sleeve 12 and the second feedback member 13 is broken by the action of the opposite force between the outer spring 10 and the injection push rod 8, the first locking sleeve self-locking block 1203 goes down over the positioning groove 1302, and the second feedback member 13 moves towards the holding end direction until it hits the top cover 4, thereby making a sound to remind the patient that the injection is completed;
[0107] 5、As shown in Figures 15-16 When the injection push rod 8 drives the first self-locking sleeve 12 to move towards the injection end, the first self-locking sleeve 12 and the first push rod sleeve 11 move relatively because the first push rod sleeve 11 is detachably connected with the pen body 2. In this process, the first self-locking pushing part 1201 of the first self-locking sleeve 12 pushes the first self-locking deforming part 1103 of the first push rod sleeve 11 to deform away from the central axis until the first self-locking step 1202 of the first self-locking sleeve 12 extends into the first self-locking groove 1104 of the first push rod sleeve 11 and is limited by the first self-locking groove 1104, so that the relative position between the first self-locking sleeve 12 and the first push rod sleeve 11 no longer changes, and the first self-locking deforming part 1103 remains deformed away from the central axis. At this time, the injection is completed.
[0108] 6、After the injection is completed, the present application leaves the skin. Because the outer spring 10 is in a compressed state before, under the action of the outer spring 10, the sliding sleeve 9 resets towards the injection end until Figures 17-19 As shown in the resetting process, because the elastic self-locking claw 902 is elastic, the elastic self-locking claw 902 is also pushed to deform away from the central axis, which does not hinder the resetting of the sliding sleeve 9. After the resetting of the sliding sleeve 9, the elastic self-locking claw 902 also resets to the initial state. At this time, the elastic self-locking claw 902 interferes with the first self-locking deforming part 1103 along the central axis direction, thereby realizing the interference self-locking between the first self-locking deforming part 1103 and the sliding sleeve 9.
[0109] Example 2
[0110] Referring to the accompanying Figure 37 , 38 and referring to the accompanying Figures 1-36The difference between the embodiment and the embodiment 1 is that the push rod sleeve and the self-locking sleeve are different. The second push rod sleeve 14 in the second embodiment has the following shape: the second push rod sleeve 14 is provided with two second push sleeve deformation claws 1401 which are uniformly arranged around the central axis of the second push rod sleeve 14 and elastically deformed away from the central axis in a natural state. The inner side of each second push sleeve deformation claw 1401 is provided with a plurality of second locking inner protrusions 1402 for locking the injection push rod 8. The second push sleeve deformation claw 1401 is provided with an inward retraction portion extending towards the central axis at one end towards the injection end. The inward retraction portion is arc-shaped and has the following effect: avoiding interference with the sliding sleeve 9 as much as possible in the early stage of assembling the application, facilitating assembly. The second push rod sleeve 14 is provided with a second needle tube support seat 1406 for supporting the abutment of the medicine container 6 at one end close to the injection end. The connection part of the main body of the second push rod sleeve 14 and the second needle tube support seat 1406 is an elastic member. Optionally, the side wall of the second push rod sleeve 14 is provided with a plurality of second self-locking deformation portions 1403 for deforming away from the central axis. The second self-locking deformation portions 1403 are uniformly arranged around the central axis. The second push rod sleeve 14 is provided with a second self-locking groove 1404 below the second self-locking deformation portions 1403. The second push rod sleeve 14 is provided with a second needle tube support seat 1406 for supporting the abutment of the medicine container 6 at one end close to the injection end. The connection part of the main body of the second push rod sleeve 14 and the second needle tube support seat 1406 is an elastic member. The second push rod sleeve 14 is provided with a second self-locking guide groove for guiding the self-locking sleeve. The second self-locking deformation portion 1403 is provided with a second self-locking guide block 1405 for guiding the second self-locking push portion 1501. The guiding surface of the second self-locking guide block 1405 for guiding is arc-shaped. The second push rod sleeve 14 is provided with a second limiting groove 1407.
[0111] The second self-locking sleeve 15 penetrates the inside of the second feedback member 13. The outer wall of the second self-locking sleeve 15 is provided with a plurality of second self-locking push portions 1501 for pushing the second self-locking deformation portions 1403 away from the central axis until the second self-locking deformation portions 1403 interfere with the sliding sleeve 9 in the same direction along the central axis. The outer wall of the second self-locking sleeve 15 is provided with a second self-locking step 1502 for extending into the second self-locking groove 1404. The second self-locking sleeve 15 is provided with a second sleeve self-locking block 1503 which can move in the radial direction of the second self-locking sleeve 15. When the second self-locking sleeve 15 is in the second working state, the second sleeve self-locking block 1503 protrudes from the second self-locking sleeve 15 and the side of the second sleeve self-locking block 1503 away from the top cover 4 abuts against the second feedback member 13. When the second self-locking sleeve 15 is in the second working state, the second sleeve self-locking block 1503 deforms towards the inside of the second self-locking sleeve 15 to release the stop of the second feedback member 13, so that the second feedback member 13 moves towards the top cover 4.
[0112] Optionally, the second lock sleeve self-locking block 1503 is an elastic arm connected to the second self-locking sleeve 15, and an abutting inclined surface is arranged on the side of the second lock sleeve self-locking block 1503 away from the top cover 4, the abutting inclined surface abuts against the second feedback member 13, and the abutting inclined surface is used to guide the movement of the second lock sleeve self-locking block 1503 to the inside of the second self-locking sleeve 15.
[0113] The difference between the embodiment and the embodiment 1 is that a hysteresis part is arranged on the end of the trigger member close to the first feedback member. After the trigger member is switched from the first working state to the second working state, the second feedback member 13 moving towards the first feedback member can contact and pass through the hysteresis part, so as to slow down the speed of the movement of the second feedback member 13, so as to ensure that the second feedback member 13 hits the first feedback member to generate a sound signal and / or a tactile signal after the injection is completed.
[0114] Through the above arrangement, the time of generating the feedback signal is delayed by the hysteresis part, so as to improve the accuracy of the feedback signal in the scene that the feedback signal is too early, such as the pressure of the drug injection is large and the elastic force of the outer spring 10 is large, so that the feedback signal is generated only after the complete injection, so as to prevent the syringe from being pulled out before the complete injection of the drug.
[0115] In the embodiment, the trigger member is the second self-locking sleeve 15, and the hysteresis part is the second hysteresis block 1504 on the second self-locking sleeve 15.
[0116] Optionally, the second hysteresis block 1504 is an elastic arm connected to the trigger member, and there is an interference amount between the second feedback member 13 and the second hysteresis block 1504 in the direction perpendicular to the movement direction of the second feedback member 13, and the deformation amount of the elastic arm is greater than the interference amount. It can be understood that when the second feedback member 13 is not in contact with the second hysteresis block 1504, the outer wall of the second hysteresis block 1504 and the inner wall of the second feedback member 13 are in interference fit in the central axis direction; after the second feedback member 13 is in contact with the second hysteresis block 1504, the second hysteresis block 1504 deforms to the inside of the second self-locking sleeve 15, so that the second hysteresis block 1504 cannot stop the second feedback member 13 from continuing to move towards the top cover 4. After the second hysteresis block 1504 is in contact with the second feedback member 13, because of the interference fit between the second hysteresis block 1504 and the second feedback member 13, the second hysteresis block 1504 delays the time point at which the second feedback member 13 hits the top cover 4, so as to ensure that the sound feedback and the tactile feedback occur after the injection is completed.
[0117] It is worth noting that in other embodiments, the hysteresis part can be in transition fit with the second feedback member 13. In this way, after the second feedback member 13 is in contact with the second hysteresis block 1504, the transition fit between the second hysteresis block 1504 and the second feedback member 13 cannot stop the second feedback member 13 from continuing to move towards the first feedback member, but the second hysteresis block 1504 delays the second feedback member 13 from hitting the top cover 4 when in contact.
Claims
1. A pen-type syringe, characterized in that: The device includes a pen body (2) and an injection mechanism. The pen body (2) has a medicine chamber for holding a drug container inside. The injection mechanism includes an injection push rod (8). The injection push rod (8) and the medicine chamber are distributed along the axial direction of the pen body (2). The injection push rod (8) can move towards the medicine chamber to push out the drug in the drug container. It also includes a locking mechanism configured to lock and unlock the injection plunger (8) along the axial direction of the pen body (2), and the injection plunger (8) can move toward the drug reservoir after being unlocked; as well as, The identification component is connected to the pen body (2) and linked with the locking mechanism. When the pen syringe is not injected with medicine, the identification component is in an injection-ready state that can move along the axis of the pen body (2). After the identification component moves a preset distance, the identification component can drive the locking mechanism to unlock the injection plunger (8). After the pen syringe is injected with medicine, the identification component is in an injected state that is locked by the locking mechanism. The locking mechanism includes a push rod sleeve, which is sleeved on the outside of the injection push rod (8). The push rod sleeve is provided with at least one push rod deformation claw, and the push rod deformation claw is provided with a locking part for locking the injection push rod (8). The end of the push rod deformation claw away from the push rod sleeve is elastically deformed away from the central axis in its natural state. The injection push rod (8) is provided with a plurality of push rod locking grooves (801) for cooperating with the locking part to lock the injection push rod (8). The push sleeve deformable claw can make the locking part extend into the push rod locking groove (801) to lock the injection push rod (8). The push sleeve deformable claw can deform to the state where the locking part locks the injection push rod (8) under the action of external force, and can also be reset to the state where the locking part unlocks the injection push rod (8) after the external force is removed.
2. The pen-type syringe according to claim 1, characterized in that: The injection mechanism also includes a top cover (4), which is located at the holding end of the pen body (2). An injection drive is abutted between the injection push rod (8) and the top cover (4). When the injection push rod (8) is locked by the locking mechanism, the injection drive is in a power-accumulating state. When the injection push rod (8) is unlocked by the locking mechanism, the injection drive pushes the injection push rod (8) toward the drug chamber.
3. The pen-type syringe according to claim 1, characterized in that: The locking mechanism further includes a sliding sleeve (9), which is slidably sleeved on the outer wall of the push rod sleeve along the axial direction of the pen body (2); The sliding sleeve (9) has a locked position and a released position. When the sliding sleeve (9) is in the locked position, the sliding sleeve (9) presses the push sleeve deformation claw to lock the injection push rod (8). When the sliding sleeve (9) is in the released position, the sliding sleeve (9) releases the pressure on the push sleeve deformation claw to unlock the injection push rod (8).
4. The pen-type syringe according to claim 3, characterized in that: One end of the sliding sleeve (9) has an expansion portion that is arranged in a conical expansion shape. When the sliding sleeve (9) is in the release position, the expansion portion corresponds to the position of the push sleeve deformation claw to release the pressure on the push sleeve deformation claw.
5. The pen-type syringe according to claim 3, characterized in that: The identification element is a needle protector (5) disposed on the injection end of the pen body (2). The end of the needle protector (5) away from the injection end abuts against the sliding sleeve (9). When the needle protector (5) abuts against the injection site, the needle protector (5) pushes the sliding sleeve (9) from the locked position to the released position.
6. The pen-type syringe according to claim 1, characterized in that: The identification element is a needle protective sleeve (5) disposed on the injection end of the pen body (2). At least one self-locking element is provided on the side wall of the push rod sleeve. The self-locking element can move into the push rod sleeve to a clearance position to avoid the needle protective sleeve (5) in the injection state. The self-locking element can also move outward to a stop position to lock the needle protective sleeve (5) after stopping it.
7. The pen-type syringe according to claim 6, characterized in that: A self-locking sleeve is slidably disposed in the cavity of the push rod sleeve. The self-locking sleeve and the injection push rod (8) are linked together. The outer wall of the self-locking sleeve is provided with a self-locking pushing part corresponding to the self-locking component. After the injection push rod (8) moves a preset distance toward the drug compartment, the self-locking pushing part can push the self-locking component that is retracted into the push rod sleeve to a position that protrudes from the push rod sleeve.
8. The pen-type syringe according to claim 1, characterized in that: It also includes a feedback mechanism configured to generate an acoustic signal and / or a tactile signal at the end of the injection phase of the pen injector.
9. The pen-type syringe according to claim 8, characterized in that: The feedback mechanism includes a first feedback element, a second feedback element (13), and a trigger component. The first feedback element is connected to the pen body (2), and the second feedback element (13) is located on the side of the first feedback element near the injection end of the pen body (2). The second feedback element (13) can slide along the axial direction of the pen body (2). The triggering component includes a force-applying component and a triggering component. The force-applying component is used to apply a force toward the first feedback component to the second feedback component (13). The triggering component is linked with the injection push rod (8). The triggering component has a first working state that stops the second feedback component (13) from moving toward the first feedback component and a second working state that releases the stop on the second feedback component (13). When the pen syringe is in the final stage of injection, the injection plunger (8) drives the trigger to switch from the first working state to the second working state, so that the second feedback element (13) strikes the first feedback element under the action of the force-applying element to generate sound signal and / or tactile signal.
10. The pen-type syringe according to claim 9, characterized in that: The second feedback member (13) is slidably inserted inside the locking mechanism. The outer wall of the second feedback member (13) is provided with several limiting parts, and the side of the limiting part near the medicine compartment abuts against the locking mechanism.
11. The pen-type syringe according to claim 9, characterized in that: The trigger is inserted inside the second feedback member (13), and a stop portion that can move radially along the trigger is provided on the trigger; When the trigger is in the first working state, the stop part protrudes from the trigger and the side of the stop part near the medicine tank abuts against the second feedback element (13); When the trigger is in the second working state, the stop part deforms into the trigger to release the stop on the second feedback member (13) and make the second feedback member (13) move toward the first feedback member.
12. The pen-type syringe according to claim 11, characterized in that: The stop part is an elastic arm connected to the trigger member. The side of the elastic arm away from the first feedback member is provided with an abutting slope. The abutting slope abuts against the second feedback member (13). The abutting slope is used to guide the elastic arm to move into the interior of the trigger member.
13. The pen-type syringe according to claim 9, characterized in that: The first feedback element is plate-shaped, and the second feedback element (13) is ring-shaped. Several notches are opened on the top of the second feedback element (13) along its circumference.
Citation Information
Patent Citations
Automatic needle feeding mechanism of pre-encapsulated automatic injection pen
CN117599284A