Disposable syringe with knob not extending out
By designing a structure with no knobs extended and automatic injection in a disposable syringe, the problem of inconvenience in use of existing syringes when injecting large doses is solved, and a more relaxed injection process is achieved, suitable for people with weaker strength.
Patent Information
- Application Number
- CN202421423380.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-20
- Publication Date
- 2025-06-27
- Estimated Expiration
- 2034-06-20
AI Technical Summary
When existing disposable syringes need to be injected with a larger dose, the knob needs to be extended longer, resulting in patients having to open their thumbs up greatly, which is inconvenient to use and requires a greater force to inject drugs.
A disposable syringe with no knob extending is designed, and by setting a damping structure and elastic member between the rotating assembly and the pen holder, the clutch structure is driven to switch to the engaged state by pressing the button, and automatic injection is achieved.
The knob is always connected to the pen holder. When injecting, you only need to press the button to achieve automatic injection, which reduces the need for force for patients. It is suitable for people with weaker strength and is more convenient and quick to use.
Smart Images
Figure CN223026473U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of disposable syringes, in particular to a disposable syringe with a non - protruding knob. Background Art
[0002] A disposable syringe is not reused after all the liquid medicine in the syringe barrel is injected. When most injection pens for drugs such as insulin on the market preset the injection volume of the medicine, when rotating the knob, the knob moves axially outwards at the same time, and the more it rotates, the longer it extends. When the required injection dose is large, the extended length is very long. At this time, when the patient uses it, holding the pen body with one hand, the thumb needs to open wide to press on the button for injection. At this time, because the thumb is opened wide, it is very inconvenient to use. Content of the Utility Model
[0003] In view of this, the purpose of the utility model is to provide a disposable syringe with a non - protruding knob, which can automatically inject as long as the button is pressed.
[0004] The technical solution adopted by the utility model to solve its technical problems is to provide a disposable syringe with a non - protruding knob, which includes a pen barrel. The pen barrel is provided with a syringe barrel, a piston capable of pushing the liquid medicine in the syringe barrel out, a screw rod connected to the piston, a rotating member threadedly connected to the screw rod, and a rotating assembly. When the rotating assembly rotates forward, it can drive the screw rod and the piston to move forward through the rotating member. A damping structure is provided between the rotating assembly and the pen barrel to provide resistance when the rotating assembly rotates relative to the pen barrel. The rotating assembly has a connected state connected to the damping structure and a separated state separated from the damping structure. A clutch structure is provided between the rotating assembly and the rotating member so that the rotating assembly can drive the rotating member to rotate relative to the pen barrel. The clutch structure has an engaged state and a disengaged state. A first elastic member is provided between the rotating assembly and the pen barrel, which can generate elastic deformation when the rotating assembly is in the connected state and rotates in the opposite direction relative to the pen barrel. The pen barrel is also provided with a knob capable of driving the rotating assembly to overcome the resistance of the damping structure and rotate relative to the pen barrel, a button connected to the rotating assembly, and a second elastic member arranged between the button and the knob for driving the rotating assembly to switch to the connected state. When the button is pressed, the clutch structure is driven to switch to the engaged state.
[0005] As a further improvement of the utility model, the damping structure includes a plurality of rotating triangular teeth arranged on the rotating assembly and a plurality of fixed triangular teeth arranged on the inner side wall of the pen barrel. The fixed triangular teeth are each provided with a first gentle slope and a first steep slope, and the rotating triangular teeth are each provided with a second gentle slope cooperating with the first gentle slope and a second steep slope cooperating with the first steep slope. When the rotating assembly is in the separated state, the rotating triangular teeth disengage from the fixed triangular teeth.
[0006] As a further improvement of the present utility model, the rotating assembly includes a driving sleeve, a clutch rod disposed within the driving sleeve, and a scale sleeve sleeved on the driving sleeve. The pen barrel is provided with a scale through hole for exposing the scale sleeve, and the button is connected to the clutch rod.
[0007] As a further improvement of the present utility model, the clutch rod is provided with a first convex block, and the inner side wall of the knob is provided with a first groove into which the first convex block can be inserted. When the rotating assembly is in a separated state, the first convex block disengages from the first groove.
[0008] As a further improvement of the present utility model, the clutch structure includes a second convex block disposed on the rotating member and a second groove disposed on the clutch rod into which the second convex block can be inserted. The disposable syringe further includes a fixing member fixedly connected within the pen barrel. The fixing member is provided with an annular fixing groove, and the rotating member is provided with a rotating convex block clamped within the annular fixing groove.
[0009] As a further improvement of the present utility model, a stop member is threadedly connected to the screw and is located within the clutch rod. The inner side wall of the clutch rod is provided with clutch convex blocks arranged along the axial direction, and the stop member is provided with a stop groove into which the clutch convex blocks can be inserted.
[0010] As a further improvement of the present utility model, the clutch rod is provided with a clutch through hole, the button is provided with a connecting buckle that can be clamped within the clutch through hole, and the knob is provided with a knob through hole through which the connecting buckle can pass.
[0011] As a further improvement of the present utility model, the outer peripheral surface of the driving sleeve is provided with driving convex blocks arranged along the axial direction. The inner side wall of the scale sleeve is provided with scale inner grooves into which the driving convex blocks can be inserted. The inner side wall of the pen barrel is provided with pen barrel convex blocks, and the outer peripheral surface of the scale sleeve is provided with spiral scale outer grooves into which the pen barrel convex blocks can be inserted.
[0012] As a further improvement of the present utility model, the pen barrel includes a pen tube and a fixed spring plug disposed at one end of the pen tube. The first elastic member is a torsion spring. The rotating assembly is provided with a third groove into which one end of the torsion spring can be inserted, and the fixed spring plug is provided with a fourth groove into which the other end of the torsion spring can be inserted.
[0013] As a further improvement of the present utility model, the outer peripheral surface of the pen tube is provided with an annular groove, and the inner side wall of the knob is provided with an annular convex block clamped within the annular groove.
[0014] The beneficial effects of the present utility model are at least as follows: When adjusting the injection amount by rotating the knob, the knob always remains connected to the pen barrel. During injection, only by pressing the button to drive the clutch structure to switch to the engaged state can automatic injection be achieved. The design that the knob does not extend enables the patient not to need to open the thumb greatly, and the force required to press the button is also relatively small. The force for injecting the drug is replaced by the first elastic member, and there is no need to apply force to inject, which is convenient and fast and is suitable for people with weaker strength. Brief Description of the Drawings
[0015] Figure 1 is a structural sectional view of the present utility model;
[0016] Figure 2 is Figure 1 an enlarged view of the partial view A in
[0017] Figure 3 is Figure 1 an enlarged view of the partial view B in
[0018] Figure 4 is an exploded structural view of the present utility model;
[0019] Figure 5 is a structural schematic diagram of the present utility model;
[0020] Figure 6 is a structural schematic diagram of the pen tube of the present utility model;
[0021] Figure 7 is a structural schematic diagram of the knob of the present utility model;
[0022] Figure 8 is a structural schematic diagram of the rotating assembly and the fixed spring plug of the present utility model. Detailed Description of the Preferred Embodiments
[0023] Next, the technical solutions of the present utility model will be clearly and completely described in conjunction with the accompanying drawings.
[0024] Refer to Figure 1-8, the present utility model provides a disposable syringe with a non-extending knob, which comprises a barrel 1. The barrel 1 is provided with a syringe 2, a piston 21 capable of pushing the liquid medicine in the syringe 2, a screw rod 22 connected to the piston 21, a rotating member 23 threadedly connected to the screw rod 22, and a rotating assembly 3. When the rotating assembly 3 rotates forward, it can drive the screw rod 22 and the piston 21 to move forward through the rotating member 23. A damping structure 6 is provided between the rotating assembly 3 and the barrel 1 to provide resistance when the rotating assembly 3 rotates relative to the barrel 1. The rotating assembly 3 has a connected state connected to the damping structure 6 and a separated state separated from the damping structure 6. A clutch structure 230 is provided between the rotating assembly 3 and the rotating member 23 so that the rotating assembly 3 can drive the rotating member 23 to rotate relative to the barrel 1. The clutch structure 230 has an engaged state and a disengaged state. A first elastic member 4 capable of elastically deforming is provided between the rotating assembly 3 and the barrel 1 when the rotating assembly 3 is in the connected state and rotates reversely relative to the barrel 1. The barrel 1 is further provided with a knob 5 capable of driving the rotating assembly 3 to overcome the resistance of the damping structure 6 and rotate relative to the barrel 1, a button 7 connected to the rotating assembly 3, and a second elastic member 71 provided between the button 7 and the knob 5 for driving the rotating assembly 3 to switch to the connected state. When the button 7 is pressed, the clutch structure 230 is driven to switch to the engaged state; when adjusting the injection volume by rotating the knob 5, the knob 5 always remains connected to the barrel 1. During injection, only by pressing the button 7 to drive the clutch structure 230 to switch to the engaged state can automatic injection be achieved. The design of the non-extending knob enables the patient not to need to open the thumb greatly, and the force required to press the button 7 is also small. The force for injecting the medicine is replaced by the first elastic member 4, and there is no need to push forcefully, which is convenient and fast and suitable for people with weak strength; the forward rotation can refer to Figure 1 the clockwise direction of the right view of
[0025] Refer to Figure 2 , 4, 6, and 8, the damping structure 6 includes a plurality of rotating triangular teeth 61 provided on the rotating assembly 3 and a plurality of fixed triangular teeth 62 provided on the inner side wall of the pen barrel 1. The fixed triangular teeth 62 are each provided with a first gentle slope 621 and a first steep slope 622. The rotating triangular teeth 61 are each provided with a second gentle slope 611 that cooperates with the first gentle slope 621 and a second steep slope 612 that cooperates with the first steep slope 622. When the rotating assembly 3 is in a separated state, the rotating triangular teeth 61 disengage from the fixed triangular teeth 62; when the injection amount is increased by rotating the knob 5, the first gentle slope 621 and the second gentle slope 611 cooperate, and the slope is small, so a small force can be used to increase the injection amount, and each time the rotating triangular teeth 61 move through a fixed triangular tooth 62 is an increase amount. Under the action of the first elastic member 4, the second steep slope 612 will be attached to the first steep slope 622, so that the injection amount increased by passing through each fixed triangular tooth 62 is accurate. When the button 7 is pressed to drive the clutch structure 230 to switch to the engaged state, the rotating triangular teeth 61 will disengage from the fixed triangular teeth 62, so that under the action of the first elastic member 4, the rotating assembly 3 will be driven to rotate back to drive the screw rod 22 to move forward to eject the liquid medicine.
[0026] Referring to Figure 4 and Figure 8 , the rotating assembly 3 includes a driving sleeve 31, a clutch rod 32 disposed within the driving sleeve 31, and a scale sleeve 33 sleeved on the driving sleeve 31. The pen barrel 1 is provided with a scale through hole 11 for exposing the scale sleeve 33, and the button 7 is connected to the clutch rod 32; when adjusting by rotating the knob 5, the value of the scale sleeve 33 can be observed through the scale through hole 11 to adjust the injection amount. As a specific connection method, the driving sleeve 31 and the clutch rod 32 are connected by a snap connection.
[0027] Referring to Figure 4 and Figure 7 , the clutch rod 32 is provided with a first convex block 321, and the inner side wall of the knob 5 is provided with a first groove 51 into which the first convex block 321 can be inserted. When the rotating assembly 3 is in a separated state, the first convex block 321 disengages from the first groove 51.
[0028] Referring to Figure 4 , the clutch structure 230 includes a second convex block 231 provided on the rotating member 23 and a second groove 322 provided on the clutch rod 32 into which the second convex block 231 can be inserted. The disposable syringe further includes a fixing member 24 fixedly connected within the pen barrel 1. The fixing member 24 is provided with an annular fixing groove 241, and the rotating member 23 is provided with a rotating convex block 232 clamped within the annular fixing groove 241; the rotating member 23 is rotatably connected to the fixing member 24 through the rotating convex block 232, so that the rotating member 23 can only perform rotational motion and cannot perform axial motion, so that when the clutch structure 230 is switched to the engaged state and the clutch rod 32 is sleeved on the rotating member 23, the screw rod 22 can be directly driven to move forward.
[0029] Referring to Figure 2 and Figure 4 , a stopper 25 located inside the clutch lever 32 is threadedly connected to the screw rod 22. The inner side wall of the clutch lever 32 is provided with clutch protrusions arranged axially, and the stopper 25 is provided with a stopper groove 251 for the clutch protrusions to insert into; since the clutch lever 32 has clutch protrusions inserted into the stopper groove 251, when the knob 5 is rotated, the stopper 25 will be driven to rotate together, causing the stopper 25 to move towards the end of the screw rod 22, that is Figure 2 to move to the right in
[0030] Referring to Figure 3 and Figure 7 it can be seen that the clutch lever 32 is provided with a clutch through hole 323, the button 7 is provided with a connection buckle 72 that can be snap-fitted into the clutch through hole 323, and the knob 5 is provided with a knob through hole 52 for the connection buckle 72 to pass through.
[0031] Referring to Figure 4 and Figure 8 , the outer peripheral surface of the drive sleeve 31 is provided with drive protrusions 311 arranged along the axial direction, the inner side wall of the scale sleeve 33 is provided with a scale inner groove 331 for the drive protrusions 311 to insert into, the inner side wall of the pen barrel 1 is provided with a pen barrel protrusion 12, and the outer peripheral surface of the scale sleeve 33 is provided with a spiral scale outer groove 332 for the pen barrel protrusion 12 to insert into; this enables the scale sleeve 33 to only advance spirally and also avoids the situation where the scale sleeve 33 rotates relative to the drive sleeve 31 resulting in low precision.
[0032] Referring to Figure 3 , 4 and 8, the pen barrel 1 includes a pen tube 13 and a fixed spring plug 14 provided at one end of the pen tube 13. The first elastic member 4 is a torsion spring. The rotating assembly 3 is provided with a third groove 34 for one end of the torsion spring to insert into, and the fixed spring plug 14 is provided with a fourth groove 141 for the other end of the torsion spring to insert into; the fixed spring plug 14 is fixedly arranged so that one end of the torsion spring is always fixed, and the other end is used to absorb the torque of the rotating assembly 3 or release the torque onto the rotating assembly 3.
[0033] As a further improvement of the present utility model, the outer peripheral surface of the pen tube 13 is provided with an annular groove 131, and the inner side wall of the knob 5 is provided with an annular protrusion 53 that is snap-fitted into the annular groove 131; this enables the knob 5 to be unable to move axially and can only rotate, realizing the design that the knob does not protrude.
Claims
1. A disposable syringe with a knob that does not extend, characterized in that: The invention comprises a pen barrel (1), wherein the pen barrel (1) is provided with a syringe (2), a piston (21) capable of pushing out a liquid medicine in the syringe (2), a screw (22) connected to the piston (21), a rotating member (23) threadedly connected to the screw (22), and a rotating assembly (3); when the rotating assembly (3) rotates in the forward direction, the screw (22) and the piston (21) can be driven to move forward through the rotating member (23); a damping structure (6) is provided between the rotating assembly (3) and the pen barrel (1) to provide resistance when the rotating assembly (3) rotates relative to the pen barrel (1); the rotating assembly (3) has a connection state connected to the damping structure (6) and a separation state separated from the damping structure (6); a clutch structure (230) is provided between the rotating assembly (3) and the rotating member (23) to enable the rotating assembly (3) to rotate relative to the pen barrel (1); The component (3) can drive the rotating component (23) to rotate relative to the pen holder (1); the clutch structure (230) has an engaged state and a disengaged state; a first elastic component (4) is provided between the rotating component (3) and the pen holder (1) and can generate elastic deformation when the rotating component (3) is in a connected state and when the rotating component (3) rotates in the opposite direction relative to the pen holder (1); the pen holder (1) is also provided with a knob (5) that can drive the rotating component (3) to overcome the resistance of the damping structure (6) and rotate relative to the pen holder (1); a button (7) connected to the rotating component (3); and a second elastic component (71) provided between the button (7) and the knob (5) and used for driving the rotating component (3) to switch to the connected state; when the button (7) is pressed, the clutch structure (230) is driven to switch to the engaged state.
2. The disposable syringe with a knob that does not extend according to claim 1, characterized in that: The damping structure (6) comprises a plurality of rotating triangular teeth (61) arranged on the rotating assembly (3) and a plurality of fixed triangular teeth (62) arranged on the inner wall of the pen holder (1); the fixed triangular teeth (62) are each provided with a first gentle slope surface (621) and a first steep slope surface (622); the rotating triangular teeth (61) are each provided with a second gentle slope surface (611) cooperating with the first gentle slope surface (621) and a second steep slope surface (612) cooperating with the first steep slope surface (622); when the rotating assembly (3) is in a separated state, the rotating triangular teeth (61) are separated from the fixed triangular teeth (62).
3. The disposable syringe with a knob that does not extend according to claim 1, characterized in that: The rotating assembly (3) comprises a driving sleeve (31), a clutch rod (32) arranged inside the driving sleeve (31), and a scale sleeve (33) sleeved on the driving sleeve (31); the pen holder (1) is provided with a scale through hole (11) for exposing the scale sleeve (33); and the button (7) is connected to the clutch rod (32).
4. The disposable syringe with a knob that does not extend according to claim 3, characterized in that: The clutch rod (32) is provided with a first protrusion (321), and the inner side wall of the knob (5) is provided with a first groove (51) into which the first protrusion (321) can be inserted. When the rotating assembly (3) is in a separated state, the first protrusion (321) is separated from the first groove (51).
5. The disposable syringe with a knob that does not extend according to claim 3, characterized in that: The clutch structure (230) comprises a second protrusion (231) arranged on the rotating member (23) and a second groove (322) arranged on the clutch rod (32) and capable of being inserted into the second protrusion (231). The disposable syringe further comprises a fixing member (24) fixedly connected to the inside of the pen barrel (1), wherein the fixing member (24) is provided with an annular fixing groove (241), and the rotating member (23) is provided with a rotating protrusion (232) which is clamped in the annular fixing groove (241).
6. The disposable syringe with a knob that does not extend according to claim 3, characterized in that: The screw rod (22) is threadedly connected with a stopper (25) located inside the clutch rod (32); the inner side wall of the clutch rod (32) is provided with a clutch protrusion arranged along the axial direction; and the stopper (25) is provided with a stopper groove (251) for the clutch protrusion to be inserted.
7. The disposable syringe with a knob that does not extend according to claim 3, characterized in that: The clutch rod (32) is provided with a clutch through hole (323), the button (7) is provided with a connecting buckle (72) capable of being snapped into the clutch through hole (323), and the knob (5) is provided with a knob through hole (52) through which the connecting buckle (72) can pass.
8. The disposable syringe with a knob that does not extend according to claim 3, characterized in that: The outer peripheral surface of the driving sleeve (31) is provided with a driving protrusion (311) arranged along the axial direction, the inner side wall of the scale sleeve (33) is provided with a scale inner groove (331) for the driving protrusion (311) to be inserted, the inner side wall of the pen holder (1) is provided with a pen holder protrusion (12), and the outer peripheral surface of the scale sleeve (33) is provided with a spiral scale outer groove (332) for the pen holder protrusion (12) to be inserted.
9. The disposable syringe with a knob that does not extend according to claim 1, characterized in that: The pen holder (1) comprises a pen tube (13) and a spring plug (14) arranged at one end of the pen tube (13); the first elastic member (4) is a torsion spring; the rotating assembly (3) is provided with a third groove (34) for inserting one end of the torsion spring; and the spring plug (14) is provided with a fourth groove (141) for inserting the other end of the torsion spring.
10. The disposable syringe with a knob that does not extend according to claim 9, characterized in that: An annular groove (131) is provided on the outer peripheral surface of the pen tube (13), and an annular protrusion (53) which is clamped in the annular groove (131) is provided on the inner side wall of the knob (5).