A dose setting sound structure for an auto-injector

Abstract

The utility model discloses a dose setting sound production structure suitable for automatic injector, including first clutch tooth, second clutch tooth, jumping tooth and clutch lever, the clutch lever is equipped with the sound production connecting portion, the upper end of first clutch tooth is equipped with first ratchet wheel, the outer end surface of second clutch tooth is equipped with second ratchet wheel, the lower extreme of jumping tooth is equipped with recess, first ratchet wheel and second ratchet wheel are placed in recess, the lateral wall of recess is equipped with at least one elastic arm, be equipped with the elastic ratchet tooth of cooperation first ratchet wheel and second ratchet wheel on elastic arm, first clutch tooth, second clutch tooth and jumping tooth all are covered and are equipped on sound production connecting portion, still be equipped with the rotation clamping groove on clutch lever, the both ends of rotation clamping groove are equipped with respectively and the positive rotation stop portion and reverse rotation stop portion of clamping and stopping jumping tooth, the design simple structure, production and assembly convenient and fast, low in cost, can apply in automatic injector, and the prompt sound is sent when the rotation of setting clutch lever is accompanied.

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] Autoinjectors have reduced the difficulty of administering injections and decreased patient pain, making them popular with many healthcare professionals and patients. All autoinjectors include a accumulator; by releasing the energy stored in the accumulator, the user can 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 pen barrel of the injection pen are circumferentially fixed relative to each other. The upper end of the torsion spring is fixed relative to the upper pen barrel, 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 and sound-emitting structure suitable for automatic injectors, which allows for free adjustment of the injection dosage and emits a prompt 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 upper end of the first clutch tooth is provided with a first ratchet, the outer end face of the second clutch tooth is provided with a second ratchet, and the lower end of the jumping tooth is provided with a groove. The first ratchet and the second ratchet are placed in the groove. The side wall of the groove is provided with at least one elastic arm, and the elastic arm is provided with a mechanism that engages with the first ratchet and... The elastic ratchet of the second ratchet, the first clutch tooth, the second clutch tooth, and the jumping tooth are all fitted onto the sound-generating connection part. A positioning groove is provided between the second clutch tooth and the sound-generating connection part to cooperate with each other, allowing the second clutch tooth and the clutch lever to rotate synchronously. The clutch lever also has a rotating groove, and the jumping tooth has a rotating block that engages with the rotating groove. The rotating block can rotate a certain angle within the rotating groove. Both ends of the rotating groove have forward and reverse stopping parts to block the rotating block. When the clutch lever rotates forward and reverse, the forward and reverse stopping parts will block the rotating block, causing the elastic ratchet to jump and engage along the first clutch tooth to produce sound.

[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 pushed outward. When the rotating block rotates a certain angle in the rotating slot, 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 is pushed outward 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 lost. The clutch lever drives the jumping tooth to skip over the tooth on the first clutch tooth. After the elastic ratchet on the elastic arm skips over, it meshes with the next tooth. This process is repeated to achieve jumping engagement and sound generation.

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

[0010] Furthermore, the lower end of the first clutch tooth is provided with a connecting ring, the connecting ring extends out of the lower end face of the ratchet tooth, and the outer surface of the connecting ring is provided with a connecting key or a connecting ratchet.

[0011] 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

[0012] Figure 1 This is an exploded view of the overall structure of this utility model;

[0013] Figure 2 This is an assembly drawing of the overall structure of this utility model;

[0014] Figure 3 and Figure 4 This is an assembly drawing of the first clutch tooth, the second clutch tooth, and the clutch rod of this utility model;

[0015] Figure 5 This is an assembly drawing of the second clutch tooth and clutch lever of this utility model;

[0016] Figure 6 This is a diagram illustrating the application of this utility model. Detailed Implementation

[0017] 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.

[0018] A dosage setting sound-emitting structure suitable for auto-injectors, such as Figures 1 to 5As shown, it 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 upper end of the first clutch tooth 1 is provided with a first ratchet 11, the outer end face of the second clutch tooth 2 is provided with a second ratchet 21, and the lower end of the ratchet tooth 3 is provided with a groove. The first ratchet 11 and the second ratchet 21 are placed in the groove. The side wall of the groove is provided with at least one elastic arm. The elastic arm is provided with an elastic ratchet tooth 31 that engages 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 both fitted onto the sound-generating connection part. A positioning groove 41 is provided between the second clutch tooth 2 and the sound-generating connection part to allow the second clutch tooth 2 and the clutch lever 4 to rotate synchronously. The clutch lever 4 is also provided with a rotating groove 42. The ratchet tooth 3 is provided with a rotating block 32 that engages with the rotating groove 42. The rotating block can rotate a certain angle within the rotating groove 42. The two ends of the rotating groove 42 are respectively provided with a forward rotation stop and a reverse rotation stop to block the rotating block. When the clutch lever 4 rotates forward and reverse, the forward rotation stop and the reverse rotation stop will block the rotating block, causing the elastic ratchet tooth 31 to jump and engage along the first clutch tooth 1 to generate sound.

[0019] 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 blocks the rotating block, and the clutch lever 4 drives the elastic ratchet 31 on the ratchet 3 to engage clockwise along the first clutch tooth 1, 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 pushed outward. When the rotating block rotates a certain angle in the rotating slot 42, this angle is not greater than the rotation angle 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 is pushed outward a certain distance, so that the elastic ratchet 31 is separated from the first ratchet 11. The constraint of the first ratchet 11 on the reverse rotation of the jumping tooth 3 is invalid. The clutch lever 4 drives the jumping tooth 3 to skip over the tooth on the first clutch tooth 1. After the elastic ratchet 31 on the elastic arm skips over, it meshes with the next tooth. Due to the friction and collision between the end face of the elastic ratchet 31 and the first ratchet 11, a soft "click" jumping engagement sound is emitted as a reminder.

[0020] Furthermore, the first ratchet 11 and the second ratchet 21 have the same tooth profile and module.

[0021] Furthermore, the sound-generating connection part is provided with a plurality of spring pieces, and the end of the spring piece is provided with a buckle that engages with the first clutch tooth 1. The spring piece can retract inward for easy installation.

[0022] Furthermore, a knob is connected to the clutch lever 4 for easy turning.

[0023] Furthermore, the lower end of the first clutch tooth 1 is provided with a connecting ring, the connecting ring extends out of the lower end face of the ratchet tooth 3, and the outer surface of the connecting ring is provided with a connecting key 12 or a connecting ratchet.

[0024] like Figure 6 As shown, the sound-generating mechanism in this embodiment is mounted on the auto-injector. The pen body connector 5 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 through the connecting ratchet 44 in the middle. Turning the knob 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 is separated. The torsion spring on the clutch lever 4 can freely release the torque.

[0025] 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 upper end of the first clutch tooth has a first ratchet, and the outer end face of the second clutch tooth has a second ratchet. The lower end of the jumping tooth has a groove, and the first and second ratchets are placed in the groove. The side wall of the groove has at least one elastic arm, and the elastic arm has elastic ratchet teeth that cooperate with the first and second ratchets. The first clutch tooth, the second clutch tooth, and the jumping tooth are all sleeved on the sound-generating connection part. The second clutch tooth and the sound-generating connection part have a mutually cooperating positioning rib groove. The clutch lever also has a rotating slot, and the jumping tooth has a rotating block that engages with the rotating slot. The two ends of the rotating slot have a forward rotation stop and a reverse rotation stop, respectively, 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 lower end of the first clutch tooth is provided with a connecting ring, which extends out of the lower end face of the ratchet tooth, and the outer surface of the connecting ring is provided with a connecting key or a connecting ratchet.

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