Sound feedback structure at end of injection of injection pen

Abstract

The invention provides a sound feedback structure at the end of injection of an injection pen, which comprises a shell and a movable dose display element, and the shell is divided into a near end and a far end; a fixing assembly is arranged at the far-body end of the shell, and the dose display element is connected with the shell through a threaded structure and moves in the axial direction to indicate the dose during injection; when the injection is finished, the dose display element and the fixing component interact to generate mechanical impact sound to prompt the user that the operation is finished; the mechanical impact sound is achieved through deformation energy storage and release of the elastic component, and the volume of the impact sound can be adjusted through the deformation distance.

Description

Technical Field

[0001] The present invention relates to the technical field of adjustable-dose injection devices, and more specifically, to a sound feedback structure at the end of injection of an injection pen. Background Art

[0002] The structure of an adjustable-dose injection device includes a dose adjustment and injection mechanism and a cartridge fixing mechanism. When adjusting the dose, the user rotates on a dose adjustment member of the dose dispensing mechanism, and the force applied by the user is stored in a torsion spring for subsequent use. To dispense the thus-adjusted dose, the user presses a dispensing button on the proximal end of the syringe, and the torsional force accumulated in the torsion spring can be delivered to a driving element to drive the liquid out of the injection device.

[0003] The existing Chinese invention patent with the patent publication number CN118490935A discloses a sound feedback structure at the end of injection of an injection pen, including a housing. The front end of the housing is the proximal end close to the body, and the rear end of the housing is the distal end away from the body. A fixing component is provided at the distal end of the housing. The fixing component is sleeved with a screw support. One end of the screw support passes through the fixing component and is connected to a dose setting element. A dose display support is sleeved on the outer periphery of the screw support, and the dose display support is engaged with the fixing component through a ratchet tooth with an inclined surface at the end, so that the screw support can only move axially forward and backward relative to the dose setting element and the dose display support. The dose setting element is connected to the distal end of the housing, so that the dose setting element can only rotate relative to the housing. A torsion spring is provided between the screw support and the dose display support. One end of the torsion spring is connected to the dose display support close to the proximal end of the housing, and the other end is connected to the fixing component. A support return spring is further provided between the front end of the connection between the dose display support and the screw support and the screw injection mechanism. When the user rotates the dose setting element forward, the screw support and the dose display support are driven to rotate synchronously. Since the dose display support is engaged with the fixing component through a ratchet tooth with an inclined surface at the end, relative rotation occurs between the dose display support and the fixing component under the drive of the dose setting element. Under the interaction of the inclined surfaces of the end ratchet teeth, relative axial movement also occurs. Under the action of the support return spring, continuous impacts will occur at the tooth mating part on the end surface of the dose display support and the fixing component, thus generating a sound.

[0004] However, there is currently no sound structure to immediately notify the user of the end of injection. Therefore, how to set an accurate end sound has become a problem to be solved at present. Summary of the Invention

[0005] In view of this, the present invention provides a sound feedback structure at the end of injection of an injection pen, which includes a housing 10 and a movable dose display element 90. The housing is divided into a proximal end and a distal end; a fixing component 20 is provided at the distal end of the housing 10. The dose display element 90 is connected to the housing 10 through a threaded structure and moves axially during injection to indicate the dose. When the injection is completed, the dose display element 90 interacts with the fixing component 20 to generate a mechanical impact sound, prompting the user that the operation is completed. The mechanical impact sound is realized through the deformation energy storage and release of an elastic component 27, and the volume of the impact sound can be adjusted through the deformation distance.

[0006] A sound feedback structure at the end of injection of an injection pen, which includes a housing 10 and a movable dose display element 90. The housing is divided into a proximal end and a distal end; a fixing component 20 is provided at the distal end of the housing 10. The dose display element 90 is connected to the housing 10 through a threaded structure and moves axially during injection to indicate the dose. When the injection is completed, the dose display element 90 interacts with the fixing component 20 to generate a mechanical impact sound, prompting the user that the operation is completed. The mechanical impact sound is realized through the deformation energy storage and release of an elastic component 27, and the volume of the impact sound can be adjusted through the deformation distance.

[0007] Furthermore, the elastic component 27 is a deformable protrusion provided on the fixing component 20, which provides buffering and stores energy during impact to enhance the sound feedback.

[0008] Furthermore, a first groove 92 is provided near the distal end of the end of the dose display element 90. The fixing component 20 is provided with a second groove 24 facing the first groove 92. An elastic component 27 is provided on one side wall of the second groove 24. When the dose display element 90 rotates reversely until it contacts the elastic component 27 and deforms the elastic component 27 towards the depression of the second groove 24 until the injection is completed, the elastic component 27 snaps into the first groove 92 and impacts the depression of the first groove 92, emitting a sound indicating the end of injection.

[0009] Furthermore, when the injection is completed, the contact surface between the dose display element 90 and the fixing component 20 is a buffer surface 96, and the buffer surface 96 forms a guiding angle, so that the elastic component deforms in a predetermined direction, ensuring the stability and repeatability of the impact sound.

[0010] Furthermore, the deformation distance of the elastic component 27 is 0.4 mm or more, and this deformation distance enables the elastic component 27 to snap into the first groove 92 and impact the depression of the first groove 92 with a relatively high sound decibel.

[0011] Furthermore, a cam follower 28 is provided at the free end of the elastic member 27. The cam follower 28 is provided with a cam surface 29, and the included angle between the cam surface 29 and the buffer surface 96 is 30°-45°. By providing such a cam surface 29, when the dose display element 90 rotates forward and disengages from the cam follower 28 when the dose needs to be adjusted, the cam follower 28 is more likely to disengage from the first groove 92 and is not easily stuck.

[0012] Furthermore, the contact surface 93 between the first groove 92 and the cam follower 28 is a contact surface 93 inclined towards the buffer surface 96, and the inclination angle of the contact surface 93 is greater than the inclination angle of the cam surface 29, so as to ensure line contact with the elastic member 27 and make it effortless to disengage. At the same time, if the contact surface 93 is flat, the elastic member 27 will slide smoothly into the groove without causing a knocking sound.

[0013] Furthermore, a second card slot 94 is provided near the first groove 92 of the dose display element 90, and a second card block 25 extends outward from the end surface of the fixed assembly provided with the second groove 24. When the injection is completed, the second card block 25 is placed in the second card slot 94.

[0014] Furthermore, a second notch 95 is provided on the inner wall of the second card slot 94, and a third card block 26 is provided on the second card block 25 facing the second notch 95. When the injection is completed, the third card block 26 is placed in the second notch 95 to prevent the dose display element 90 from continuing to rotate in the reverse direction, causing the dose display element 90 to cross the outer periphery of the fixed assembly 20 and resulting in a malfunction during the next injection.

[0015] Furthermore, the generation of the knocking sound will be earlier than the contact between the second notch 95 of the dose display element 90 and the third card block 26 of the fixed assembly 20, avoiding the phenomenon of sound generation failure caused by the contact between the second notch 95 of the dose display element 90 and the third card block 26 of the fixed assembly 20 due to production and assembly errors.

[0016] The beneficial effects of the present invention: The present invention provides a sound feedback structure at the end of an injection pen injection, including a housing 10 and a movable dose display element 90. The housing is divided into a proximal end and a distal end; a fixed assembly 20 is provided at the distal end of the housing 10, and the dose display element 90 is connected to the housing 10 through a threaded structure and moves axially during injection to indicate the dose; when the injection is completed, the dose display element 90 interacts with the fixed assembly 20 to generate a mechanical knocking sound to prompt the user that the operation is completed; the mechanical knocking sound is realized through the deformation energy storage and release of the elastic member 27, and the volume of the knocking sound can be adjusted by the deformation distance. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a cross-sectional view of the overall injection pen of the present invention.

[0018] Figure 2 This is an overall exploded view of the sound feedback structure at the end of injection of the injection pen of the present invention.

[0019] Figure 3 This is a connection diagram of the sound feedback structure at the end of injection of the injection pen of the present invention.

[0020] Figure 4 This is a structural diagram of the dose display element of the sound feedback structure at the end of injection of the injection pen of the present invention.

[0021] Figure 5 This is a structural diagram of the fixing component of the sound feedback structure at the end of injection of the injection pen of the present invention.

[0022] Figure 6 This is a cross-sectional view of the connection between the dose display element and the housing of the sound feedback structure at the end of injection of the injection pen of the present invention.

[0023] Description of main component symbols

[0024] Housing 10; first card slot 11; first notch 12; screw injection mechanism 14; fixing component 20; first catch 21; first bump 22; first torsion spring mounting seat 23; second groove 24; second catch 25; third catch 26; elastic member 27; inclined guide block 28; inclined guide surface 29; screw sleeve 30; adjustment knob 50; dose scale bracket 60; first rib 61; torsion spring 70; injection button 80; dose display element 90; first groove 92; contact surface 93; second card slot 94; second notch 95; buffer surface 96.

[0025] The following specific embodiments will further illustrate the present invention in conjunction with the above-mentioned drawings. Specific embodiments Example 1:

[0026] As Figure 1-6As shown, a sound feedback structure at the end of injection of an injection pen includes a housing 10. The front end of the housing 10 is the proximal end close to the body, and the rear end of the housing 10 is the distal end away from the body. A fixing component 20 is provided at the distal end of the housing 10. A dose display element 90 is screwed to the housing 10. When adjusting the dose, the dose display element 90 moves towards the proximal end along the thread of the housing 10. When injecting, the dose display element 90 moves towards the distal end along the thread of the housing 10. When the injection is completed, the dose display element 90 just sleeved and engaged with the fixing component 20. A first groove 92 is provided at the end of the dose display element 90 near the distal end. The fixing component 20 is provided with a second groove 24 facing the first groove 92. An elastic member 27 is provided on one side wall of the second groove 24. When the dose display element 90 rotates reversely until it contacts the elastic member 27 and deforms the elastic member 27 towards the recess of the second groove 24, until the injection is completed, the elastic member 27 snaps into the first groove 92 and impacts the recess of the first groove 92, emitting a sound indicating the end of injection.

[0027] A screw injection mechanism 14 is provided at the proximal end of the housing 10. A fixing component 20 is provided at the distal end of the housing 10. A screw sleeve 30 is sleeved in the housing 10. The screw sleeve 30 sequentially passes through the fixing component 20, an adjustment knob 50 and an injection button 80 and is sleeved with them. The adjustment knob 50 is connected to the distal end of the housing 10. The adjustment knob 50 can only rotate relative to the housing 10. The outer periphery of the screw sleeve 30 is sequentially sleeved with a torsion spring 70, a dose scale disc bracket 60 and a dose display element 90 from inside to outside. The dose display element 90 is screwed to the housing 10. One end of the torsion spring 70 is connected to the dose scale disc bracket 60 near the proximal end of the housing 10, and the other end is connected to the fixing component 20. When adjusting the dose, the adjustment knob 50 is rotated forward, driving the screw sleeve 30, the dose scale disc bracket 60 and the dose display element 90 to rotate synchronously and storing energy in the torsion spring 70. The dose display element 90 moves towards the proximal end along the thread of the housing 10. When injecting, the screw sleeve 30 disengages from the injection button 80, and the screw sleeve 30 moves towards the proximal end to engage with the screw injection mechanism 14 for injection. The torsion spring 70 releases energy, and the screw sleeve 30, the dose scale disc bracket 60, the dose display element 90 and the adjustment knob 50 rotate reversely. The dose display element 90 moves towards the distal end along the thread of the housing 10.

[0028] A plurality of first ribs 61 are arranged in parallel at intervals along the axial direction on the outer periphery of the dose dial bracket 60 for mating connection with the first groove strips on the inner wall of the dose display element 90. The dose display element 90 is rotatably connected to the inner wall of the housing 10, so that the dose display element 90 can only move axially forward and backward relative to the dose dial bracket 60. A dose display window is provided at the housing 10, which cooperates with the dose display element 90 to display the required injection dose and the injection volume during the injection process.

[0029] As Figure 2 and Figure 5 As shown, a plurality of first hooks 21 are provided on the outer periphery of the fixing assembly 20, and corresponding first slots 11 for mating connection are provided at corresponding positions at the distal end of the housing 10. The first hooks 21 are matingly engaged with the first slots 11 to fix the housing 10 and the fixing assembly 20 together. A first protrusion 22 is further provided on the outer periphery of the fixing assembly 20, and a first notch 12 is provided at the corresponding position at the distal end of the housing 10. When the housing 10 and the fixing assembly 20 are matingly installed, the first protrusion 22 is exactly engaged with the first notch 12 to enhance the connection between the fixing assembly 20 and the housing 10. A first torsion spring mounting seat 23 is provided at the inner wall of the fixing assembly 20 near the distal end for fixedly mounting one end of the torsion spring.

[0030] The deformation distance of the elastic member 27 is 0.4 mm or more, and this deformation distance makes the sound decibel of the elastic member 27 springing into the first groove 92 and hitting the recess of the first groove 92 relatively high.

[0031] As Figure 2 and Figure 4 As shown, a second slot 94 is provided at the dose display element 90 near the first groove 92. A second block 25 is provided extending outward from the end face of the fixing assembly provided with the second groove 24. When the injection is completed, the second block 25 is placed in the second slot 94. A second notch 95 is provided on the inner wall of the second slot 94. A third block 26 is provided at the second block 25 facing the second notch 95. When the injection is completed, the third block 26 is placed in the second notch 95 to prevent the dose display element 90 from continuing to rotate in the reverse direction, causing the dose display element 90 to cross over the outer periphery of the fixing assembly 20 and resulting in a malfunction during the next injection.

[0032] The generation of the impact sound will be earlier than the contact between the second notch 95 of the dose display element 90 and the third block 26 of the fixing assembly 20, avoiding the phenomenon of sound generation failure caused by the contact between the second notch 95 of the dose display element 90 and the third block 26 of the fixing assembly 20 due to the error in production and assembly.

[0033] A buffer surface 96 is provided between the first groove 92 and the second card slot 94. When the dose display element 90 rotates reversely until it contacts the elastic member 27, the buffer surface 96 squeezes the elastic member 27 towards the distal end, causing the elastic member 27 to slowly deform towards the recess of the second groove 24 and storing energy in the elastic member 27.

[0034] As Figure 3 shown, a diagonal guide block 28 is provided at the free end of the elastic member 27. The diagonal guide block 28 is provided with a diagonal guide surface 29. The included angle between the diagonal guide surface 29 and the buffer surface 96 is 30°-45°. By setting such a diagonal guide surface 29, when the dose needs to be adjusted, when the dose display element 90 rotates forward and disengages from the diagonal guide block 28, the diagonal guide block 28 is more likely to disengage from the first groove 92 and is not easily stuck. The contact surface 93 between the first groove 92 and the diagonal guide block 28 is a contact surface 93 inclined towards the buffer surface 96. The inclination angle of the contact surface 93 is greater than the inclination angle of the diagonal guide surface 29, so as to ensure line contact with the elastic member 27 and make it effortless to disengage. At the same time, if the contact surface 93 is flat, the elastic member 27 will slide smoothly into the groove without causing a knocking sound.

[0035] Working principle: When the user presses the injection button 80, the force stored in the torsion spring 70 is released to drive the dose scale disk bracket 60. The first rib 61 of the dose scale disk bracket 60 cooperates with the first groove bar of the dose display element 90 to drive the dose display element 90 to rotate reversely. The scale helix of the dose display element 90 cooperates with the helix of the housing 10 to rotate in the reverse helix direction, and the numbers on the dose display element 90 gradually return to zero. When approaching the zero position, the dose display element 90 acts to squeeze the elastic member 27 of the fixing assembly 20, causing it to deform by about 0.4 mm. At the end of the injection, the elastic member 27 collides with the first groove 92 of the dose display element 90, generating a sound different from the injection process.

[0036] Beneficial effects of the present invention: The present invention provides a sound feedback structure at the end of injection of an injection pen. A sound feedback structure at the end of injection of an injection pen includes a housing 10. The front end of the housing 10 is the proximal end, and the rear end of the housing 10 is the distal end. When injecting, the dose display element 90 moves towards the distal end along the thread of the housing 10. When the injection is completed, the dose display element 90 just sleeved and engaged with the fixing assembly 20. A first groove 92 is provided at the end of the dose display element 90 near the distal end. The fixing assembly 20 is provided with a second groove 24 facing the first groove 92. An elastic member 27 is provided on one side wall of the second groove 24. When the dose display element 90 rotates reversely until it contacts the elastic member 27 and deforms the elastic member 27 towards the recess of the second groove 24, until the injection is completed, the elastic member 27 snaps into the first groove 92 and impacts the recess of the first groove 92, emitting a sound indicating the end of injection.

[0037] The above-described embodiments merely represent several implementation manners of the present invention. The description thereof is relatively specific and detailed, but it should not be construed as a limitation to the scope of the patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several variations and improvements can still be made, and these all fall within the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the appended claims.

Claims

1. An audible feedback structure for an injection pen at the end of injection, comprising a housing and a movable dosage display element, wherein the housing is divided into a proximal end and a distal end; the distal end of the housing is provided with a fixing component, characterized in that: The dosage display element is connected to the housing through a threaded structure, and moves axially during injection to indicate the dosage; when the injection is completed, the dosage display element interacts with the fixed component to produce a mechanical impact sound, prompting the user that the operation is completed; the mechanical impact sound is achieved by storing and releasing deformation energy of the elastic component, and the volume of the impact sound can be adjusted by the deformation distance.

2. The sound feedback structure of the injection pen at the end of injection as claimed in claim 1, characterized in that: The elastic component is a deformable protrusion arranged on the fixing component, which provides buffering and stores energy to enhance sound feedback during impact.

3. The sound feedback structure of the injection pen at the end of injection as claimed in claim 2, characterized in that: A first groove is provided at the end of the dosage display element near the distal end, and a second groove is provided on the fixing assembly facing the first groove. An elastic component is provided on one side wall of the second groove. When the dosage display element rotates in the opposite direction to contact the elastic component and deforms the elastic component toward the depression of the second groove, the elastic component bounces into the first groove and collides with the depression of the first groove until the injection is completed, thereby making a sound of ending the injection.

4. The sound feedback structure of the injection pen at the end of injection as claimed in claim 3, characterized in that: When the injection is finished, the contact surface between the dosage display element and the fixed component is a buffer surface, and the buffer surface forms a guide angle, so that the elastic component deforms in a predetermined direction, ensuring the stability and repeatability of the impact sound.

5. The sound feedback structure of the injection pen when the injection is completed as claimed in claim 4, characterized in that: The deformation distance of the elastic component is greater than 0.4 mm, and the deformation distance makes the sound of the elastic component rebounding into the first groove and colliding with the concave part of the first groove have a higher decibel.

6. The sound feedback structure of the injection pen when the injection is completed as claimed in claim 5, characterized in that: The free end of the elastic component is provided with an inclined guide block, and the inclined guide block is provided with an inclined guide surface. The angle between the inclined guide surface and the buffer surface is 30°-45°. When the dose needs to be adjusted, when the dose display element rotates forward and disengages from the inclined guide block, the inclined guide block is more easily disengaged from the first groove.

7. The sound feedback structure of the injection pen at the end of injection as claimed in claim 3, characterized in that: The contact surface between the first groove and the inclined guide block is a contact surface inclined toward the buffer surface, and the inclination angle of the contact surface is greater than the inclination angle of the inclined guide surface, thereby ensuring linear contact with the elastic component and effortless disengagement. At the same time, if the contact surface is flat, the elastic component can slide smoothly into the groove without causing knocking sound.

8. The sound feedback structure of the injection pen when the injection is completed as claimed in claim 7, characterized in that: The dosage display element is provided with a second slot near the first slot, and the end surface of the fixing assembly provided with the second slot is provided with a second block extending outwardly. When the injection is completed, the second block is placed in the second slot.

9. The sound feedback structure of the injection pen when the injection is completed as claimed in claim 8, characterized in that: The inner wall of the second card slot is provided with a second notch, and the second card block is provided with a third card block facing the second notch. When the injection is completed, the third card block is placed in the second notch to prevent the dose display element from continuing to rotate in the opposite direction, causing the dose display element to pass over the periphery of the fixed component, resulting in a failure in the next injection.

10. The sound feedback structure of the injection pen when the injection is completed as claimed in claim 9, characterized in that: The impact sound is generated earlier than the second notch of the dosage display element contacts the third block of the fixing component, thereby avoiding the sound failure caused by the second notch of the dosage display element contacting the third block of the fixing component first due to errors in production and assembly.

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