A dose setting sound structure for an auto-injector

Abstract

This utility model discloses a dosage setting sound-emitting structure suitable for automatic injectors, including a first clutch tooth, a second clutch tooth, a jumping tooth, and a clutch lever. The clutch lever has a sound-emitting connecting part. The inner sides of the first and second clutch teeth are respectively provided with a first ratchet and a second ratchet. The first and second clutch teeth are sleeved on the jumping tooth. The jumping tooth has at least one elastic arm, and the outer end of the elastic arm has an elastic ratchet tooth that cooperates with the first and second ratchet wheels. The first clutch tooth, the second clutch tooth, and the jumping tooth are all installed on the sound-emitting connecting part. The clutch lever also has a forward rotation stop and a reverse rotation stop to stop the second clutch tooth. This design has a simple structure, is convenient and quick to produce and assemble, and has low cost. It can be applied to automatic injectors and emits a prompt sound when the adjustment clutch lever is rotated.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, specifically to an automatic injector dosage adjustment forward and reverse rotation sound generation structure. Background Technology

[0002] Automated injectors have reduced the difficulty of administering injections and decreased patient pain, making them popular with many healthcare professionals and patients. Automated injectors all include a accumulator; by releasing the energy in the accumulator, they help the user inject a pre-set dose of medication.

[0003] Utility model patent CN117563084B discloses a dosage adjustment mechanism for an injection pen, including a power rod, a cylinder, a ball bearing, a sleeve, and a torsion spring. The cylinder is fitted over the power rod, and a spiral channel extending along the axis of the power rod is formed between the inner wall of the cylinder and the outer wall of the power rod. The ball bearing is rotatably disposed in the spiral channel. The cylinder and the upper cylinder of the injection pen are circumferentially fixed relative to each other. The upper end of the torsion spring is fixed relative to the upper cylinder, and the lower end is connected to the sleeve. The power rod can rotate relative to the cylinder under external force. The sleeve is circumferentially limited and connected to the power rod, and the sleeve is used for transmission cooperation with the transmission mechanism of the injection pen. This solution uses a transmission method with a power rod, cylinder, and ball bearing, which has high transmission accuracy and can ensure the precision of drug dosage adjustment. However, this dosage adjustment mechanism cannot emit an audible prompt during the adjustment process. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of the existing technology described above by providing a dosage adjustment sound structure that allows for free adjustment of the injection dose, emits a prompting sound during the adjustment process, and is convenient to use.

[0005] The technical solution adopted by this utility model to solve its technical problem is as follows: a dosage setting sound-emitting structure suitable for an automatic injector, including a first clutch tooth, a second clutch tooth, a jumping tooth, and a clutch rod. The clutch rod is provided with a sound-emitting connecting part. The inner sides of the first clutch tooth and the second clutch tooth are respectively provided with a first ratchet and a second ratchet. The lower end of the jumping tooth is provided with a connecting shaft. The first clutch tooth and the second clutch tooth are sleeved on the connecting shaft. The side wall of the connecting shaft is provided with at least one elastic arm. The outer end of the elastic arm is provided with an elastic ratchet tooth that cooperates with the first ratchet and the second ratchet. A first clutch tooth, a second clutch tooth, and a ratchet tooth are all fitted onto the sound-generating connection part. The sound-generating connection part has an axial groove, and the second clutch tooth has a positioning rib that engages with the axial groove, allowing the second clutch tooth and clutch lever to rotate synchronously. The first clutch tooth and the ratchet tooth can rotate on the clutch lever. The clutch lever also has a rotating groove, and the ratchet tooth has a rotating block that engages with the rotating groove. The rotating block can rotate a certain angle within the rotating groove, and both ends of the rotating groove have forward and reverse stops to block the rotating block. When the clutch lever rotates forward and reverse, the forward and reverse stops block the rotating block, causing the elastic ratchet tooth to engage and produce sound along the first clutch tooth.

[0006] Furthermore, the forward rotation surfaces of the first clutch tooth, the second clutch tooth, and the elastic ratchet are all inclined planes, preferably at an angle of 100°, while the reverse rotation surfaces are vertical. The vertically positioned reverse rotation surfaces prevent the second clutch tooth from freely reversing due to the power stored in the power component connected to the clutch lever. When the clutch lever rotates clockwise, the forward rotation stop blocks the rotating block, and the clutch lever drives the elastic ratchet on the ratchet tooth to engage and produce a sound as it rotates clockwise along the first clutch tooth. When the clutch lever rotates counterclockwise, the clutch lever connects with the second clutch tooth groove, first driving the second clutch tooth to rotate counterclockwise. Due to the meshing action of the elastic ratchet and the second ratchet, the elastic arm on the jumping tooth is compressed inward. When the rotating block rotates a certain angle in the rotating groove, this angle is not greater than the rotation angle of a single ratchet of the first clutch tooth, preferably 10° to 15°. The reverse stop blocks the rotating block. At this time, the elastic arm on the jumping tooth pushes inward a certain distance, causing the elastic ratchet to separate from the first clutch tooth. The constraint of the first clutch tooth on the reverse rotation of the jumping tooth is invalidated, and the clutch lever can drive the elastic ratchet on the jumping tooth to rotate counterclockwise along the first clutch tooth to generate sound.

[0007] Furthermore, the first ratchet and the second ratchet have the same tooth profile and module.

[0008] Furthermore, the sound-generating connection part is provided with a plurality of spring pieces, the end of the spring pieces is provided with a buckle that engages with the first clutch tooth, and the spring pieces can retract inward for easy installation.

[0009] Furthermore, the jumping tooth is provided with a slot that matches the positioning rib, which facilitates the assembly and connection of the second clutch tooth and the clutch rod.

[0010] Furthermore, a knob is connected to the clutch lever for easy turning.

[0011] Furthermore, the outer end face of the first clutch tooth is provided with a connecting key or a connecting ratchet.

[0012] Compared with the prior art, the advantages of this utility model are: the design has a simple structure, is convenient and quick to produce and assemble, and has low cost. It can be applied to the dosage adjustment mechanism of an automatic injector and emits a prompt sound when the adjustment clutch lever rotates. Attached Figure Description

[0013] Figure 1 This is an exploded view of the overall structure of this utility model;

[0014] Figure 2 This is a perspective view of the overall structure of this utility model;

[0015] Figure 3 This is an assembly drawing of the jumping tooth and clutch lever of this utility model;

[0016] Figure 4 This is an assembly drawing of the second clutch tooth and clutch lever of this utility model;

[0017] Figure 5 This is an assembly drawing of the second clutch tooth, the jumping tooth, and the clutch lever of this utility model;

[0018] Figure 6 This is a diagram illustrating the application of this utility model. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be noted that the following specific embodiments are only representative specific embodiments of the present invention, and the specific methods, devices, conditions, materials, etc., exemplified are not intended to limit the present invention or the corresponding specific embodiments.

[0020] A dosage setting sound-emitting structure suitable for auto-injectors, such as Figures 1 to 5As shown, the clutch includes a first clutch tooth 1, a second clutch tooth 2, a ratchet tooth 3, and a clutch lever 4. The clutch lever 4 has a sound-generating connection part. The inner sides of the first clutch tooth 1 and the second clutch tooth 2 are respectively provided with a first ratchet 11 and a second ratchet 21. The lower end of the ratchet tooth 3 is provided with a connecting shaft 30. The first clutch tooth 1 and the second clutch tooth 2 are sleeved on the connecting shaft 30. The side wall of the connecting shaft 30 is provided with at least one elastic arm. The outer end of the elastic arm is provided with an elastic ratchet tooth 31 that cooperates with the first ratchet 11 and the second ratchet 21. The first clutch tooth 1, the second clutch tooth 2, and the ratchet tooth 3 are all sleeved on the connecting shaft 30. The sound-generating connection part is provided with an axial groove 42. The second clutch tooth 2 is provided with a positioning rib 22 that cooperates with the axial groove 42, so that the second clutch tooth 2 and the clutch lever 4 can rotate synchronously. The first clutch tooth 1 and the ratchet tooth 3 can rotate on the clutch lever 4. The clutch lever 4 is also provided with a rotating groove 41. The ratchet tooth 3 is provided with a rotating block 32 that engages with the rotating groove 41. The rotating block 32 can rotate a certain angle within the rotating groove 41. The two ends of the rotating groove 41 are respectively provided with a forward rotation stop and a reverse rotation stop to block the rotating block 32. When the clutch lever 4 rotates forward and reverse, the forward rotation stop and the reverse rotation stop will block the rotating block 32, causing the elastic ratchet tooth 31 to jump and engage along the first clutch tooth 1 to generate sound.

[0021] Furthermore, the forward rotation surfaces of the first clutch tooth 1, the second clutch tooth 2, and the elastic ratchet 31 are all inclined planes, preferably at an angle of 100°, while the reverse rotation surfaces are vertical. The vertically positioned reverse rotation surfaces prevent the second clutch tooth 2 from freely reversing due to the power stored in the power component connected to the clutch lever 4. When the clutch lever 4 rotates clockwise, the forward rotation stop engages the rotating block 32, causing the elastic ratchet 31 on the ratchet 3 to engage along the first clutch tooth 1 in a clockwise rotation, producing a loud "click-click" sound. When the clutch lever 4 rotates counterclockwise, the clutch lever 4 connects with the groove of the second clutch tooth 2, first driving the second clutch tooth 2 to rotate counterclockwise. Due to the meshing action of the elastic ratchet 31 and the second ratchet 21, the elastic arm on the jumping tooth 3 is compressed inward. When the rotating block 32 rotates a certain angle in the rotating slot 41, the angle is not greater than the angle of rotation of a single ratchet of the first clutch tooth 1, preferably 10° to 15°. The reverse stop blocks the rotating block 32. At this time, the elastic arm on the jumping tooth 3 pushes inward a certain distance, so that the elastic ratchet 31 separates from the first clutch tooth 1. The constraint of the first clutch tooth 1 on the reverse rotation of the jumping tooth 3 is invalid. The clutch lever 4 can drive the elastic ratchet 31 on the jumping tooth 3 to rotate counterclockwise along the first clutch tooth 1. Due to the friction and collision between the elastic ratchet 31 and the end face of the first ratchet 11, a soft "click" jumping engagement sound will be emitted as a reminder.

[0022] Furthermore, the first ratchet 11 and the second ratchet 21 have the same tooth profile and module.

[0023] Furthermore, the sound-generating connection part is provided with a plurality of spring pieces 43, the end of the spring piece 43 is provided with a buckle that engages with the first clutch tooth 1, and the spring piece 43 can retract inward for easy installation.

[0024] Furthermore, the jumping tooth 3 is provided with a slot that matches the positioning rib 22, which facilitates the assembly and connection of the second clutch tooth 2 and the clutch rod 4.

[0025] Furthermore, a knob is connected to the clutch lever 4 for easy turning.

[0026] Furthermore, the outer end face of the first clutch tooth 1 is provided with a connecting key 12 or a connecting ratchet.

[0027] like Figure 6 As shown, the sound-generating mechanism in this embodiment is mounted on the auto-injector. The pen body connector 7 of the auto-injector is connected to the connecting key 12 of the first clutch tooth 1. The clutch lever 4 is connected to the knob 5 through the connecting ratchet in the middle. Twisting the knob 5 will synchronously drive the clutch lever 4 to rotate. A torsion spring can be installed inside the clutch lever 4. The energy of the torsion spring can be accumulated or reduced by the forward and reverse rotation of the clutch lever 4. When the button connected to the top of the clutch lever 4 is pressed, the sound-generating mechanism moves downward, the connection between the first clutch tooth 1 and the pen body of the injector is separated, and the connection between the clutch lever 4 and the knob 5 is separated. The torsion spring on the clutch lever 4 can freely release the torque.

[0028] The above description is only a preferred embodiment of the present utility model and should not be construed as limiting the scope of the present utility model. All simple equivalent changes and modifications made in accordance with the scope of the present utility model patent application and the description of the utility model shall still fall within the scope of the present utility model patent.

Claims

1. A dosage setting sound-emitting structure suitable for an auto-injector, characterized in that, The device includes a first clutch tooth, a second clutch tooth, a jumping tooth, and a clutch lever. The clutch lever has a sound-generating connection part. The inner sides of the first and second clutch teeth are respectively provided with a first ratchet and a second ratchet. The lower end of the jumping tooth is provided with a connecting shaft. The first and second clutch teeth are sleeved on the connecting shaft. The side wall of the connecting shaft is provided with at least one elastic arm. The outer end of the elastic arm is provided with an elastic ratchet tooth that engages with the first and second ratchet wheels. The first clutch tooth, the second clutch tooth, and the jumping tooth are all mounted on the sound-generating connection part. The sound-generating connection part is provided with an axial groove. The second clutch tooth is provided with a positioning rib that engages with the axial groove. The clutch lever is also provided with a rotating groove. The jumping tooth is provided with a rotating block that engages with the rotating groove. The two ends of the rotating groove are respectively provided with a forward rotation stop and a reverse rotation stop to block the rotating block.

2. The dosage setting sound-emitting structure suitable for an auto-injector according to claim 1, characterized in that, The forward rotation surface of the tooth profile of the first clutch tooth, the second clutch tooth, and the elastic ratchet tooth is an inclined plane, and the reverse rotation surface is a vertical plane.

3. The dosage setting sound-emitting structure suitable for an auto-injector according to claim 2, characterized in that, The forward rotation angle of the tooth profiles of the first clutch tooth, the second clutch tooth, and the elastic ratchet is 100°.

4. The dosage setting sound-emitting structure suitable for an auto-injector according to claim 2, characterized in that, The first and second ratchet wheels have the same tooth profile and module.

5. A dosage setting sound-generating structure suitable for an auto-injector according to any one of claims 2-4, characterized in that, The rotating block rotates at an angle of 15° within the rotating slot.

6. The dosage setting sound-generating structure suitable for an auto-injector according to claim 1, characterized in that, The sound-generating connection part is provided with a plurality of spring pieces, and the end of each spring piece is provided with a buckle that engages with the first clutch tooth.

7. The dosage setting sound-emitting structure suitable for an auto-injector according to claim 1, characterized in that, A knob is connected to the clutch lever.

8. The dosage setting sound-emitting structure suitable for an auto-injector according to claim 1, characterized in that, The outer end face of the first clutch tooth is provided with a connecting key or a connecting ratchet.

9. A dosage setting sound-generating structure suitable for an auto-injector according to claim 1, characterized in that, The jumping teeth are provided with slots that cooperate with the positioning ribs.

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