Dose adjustment and sound feedback structure for an injection pen
Through the design of the interlocking structure and elastic damping element, the injection pen provides smooth guidance and self-locking function during dosage adjustment, solving the problems of inconvenient operation and insufficient feedback, and improving the accuracy of dosage adjustment and user experience.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SUZHOU SENBOMED MEDICAL TECHNOLOGY LTD
- Filing Date
- 2025-04-18
- Publication Date
- 2026-07-24
AI Technical Summary
Existing injection pens are inconvenient to operate when adjusting dosage, difficult to correct errors, and lack effective audible feedback.
The design employs an interlocking structure, which provides smooth guidance and self-locking function by setting different angles of the meshing surface (α is 10°-45° and θ is 60°-90°). Combined with elastic damping elements and anti-reverse device, it realizes tactile and auditory feedback and provides perceptible feedback during dosage adjustment.
It achieves smooth dosage adjustment, provides perceptible tactile and auditory feedback, ensures accurate dosage setting and prevents rollback, and enhances the user experience.
Smart Images
Figure CN224540716U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of adjustable dosage injection devices, and more specifically, to a dosage adjustment and sound feedback structure for adjusting an injection pen. Background Technology
[0002] The adjustable dosing injection device comprises a dosing adjustment and injection mechanism and a cartridge retaining mechanism. When adjusting the dosing, the user rotates a dosing adjustment element on the dosing pouring mechanism; the force applied by the user is stored in a torsion spring for subsequent dispensing. To dispensing the adjusted dose, the user presses a dispensing button on the proximal end of the syringe; the torsional force accumulated in the torsion spring is then delivered to the drive element to propel the liquid out of the injection device.
[0003] Existing Chinese invention patent CN118490935A discloses a dosage adjustment and sound feedback structure for an injection pen, including a housing. The front end of the housing is a proximal end, and the rear end is a distal end. 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 connects to a dosage setting element. A dosage display bracket is sleeved on the outer periphery of the screw support, and the dosage display bracket engages with the fixing component 20 via ratchet teeth with beveled ends, allowing the screw support to move only axially back and forth relative to the dosage setting element and the dosage display bracket. The dosage setting element is connected to the distal end of the housing, allowing the dosage setting element to rotate relative to the housing. The screw support... A torsion spring is provided between the bracket and the dose display bracket. One end of the torsion spring is connected to the proximal end of the dose display bracket near the housing, and the other end is connected to the fixing component. A bracket return spring is also provided between the front end of the connection between the dose display bracket and the screw bracket and the screw injection mechanism. When the user rotates the dose setting element in the forward direction, it drives the screw bracket and the dose display bracket to rotate synchronously. Since the dose display bracket and the fixing component are engaged by ratchet teeth with beveled ends, the dose display bracket and the fixing component rotate relative to each other under the drive of the dose setting element. Under the interaction of the beveled ends of the ratchet teeth, axial relative movement also occurs. Under the action of the bracket return spring, the teeth on the end faces of the dose display bracket and the fixing component will continuously impact, thus producing a sound.
[0004] However, how to enable operators to easily adjust the dosage or correct the dosage in case of an error, while also providing a audible adjustment signal, has become a problem that needs to be solved. Utility Model Content
[0005] In view of this, the present invention proposes a dosage adjustment and sound feedback structure for adjusting an injection pen, including a housing 10, an adjustment mechanism, a dosage indicator component, and a feedback component. The near end of the housing 10 is provided with an injection drive mechanism 14, and the far end of the housing 10 is provided with a fixing component 20. The dosage indicator component and the fixing component 20 are connected by an engagement structure. During adjustment, the engagement structure generates perceptible tactile and auditory feedback. When the adjustment knob 50 is rotated clockwise, the angle between the contact surfaces of the teeth of the dosage indicator component and the fixing component 20 is α, and the angle α is set to 10°-45°. The engagement structure provides a smooth guiding angle to reduce resistance. When the adjustment knob 50 is rotated counterclockwise, when the teeth on the end face of the dosage indicator component and the fixing component 20 engage, the angle between the contact surfaces of the teeth of the dosage indicator component and the fixing component 20 is θ, and the angle θ is set to 60°-90°. This prevents the dosage indicator component from retracting after the dosage setting is completed, achieving self-locking.
[0006] A dosage adjustment and sound feedback structure for an injection pen includes a housing 10, an adjustment mechanism, a dosage indicator component, and a feedback component. The front end of the housing 10 is the proximal end, and the rear end is the distal end. The proximal end of the housing 10 is provided with an injection drive mechanism 14, and the distal end of the housing 10 is provided with a fixing component 20. The adjustment mechanism is linked to the injection drive mechanism 14 via a rotatable adjustment knob 50, and the adjustment action triggers the displacement of the dosage indicator component. The dosage indicator component and the fixing component 20 are connected by an engagement structure. During the adjustment process, the engagement structure generates perceptible tactile and audible sensations. The feedback component stores and releases energy during adjustment to enhance feedback perception. When the adjustment knob 50 is turned clockwise, the angle between the contact surfaces of the dose indicator component and the teeth of the fixing component 20 is α, which is set to 10°-45°. The meshing structure provides a smooth guiding angle to reduce resistance. When the adjustment knob 50 is turned counterclockwise, the angle between the contact surfaces of the dose indicator component and the teeth of the fixing component 20 is θ, which is set to 60°-90°. This prevents the dose indicator component from retracting after the dose setting is completed, thus achieving self-locking.
[0007] Furthermore, the adjustment mechanism also includes a screw sleeve 30 that is linked to the adjustment knob 50, and the screw sleeve 30 drives the injection drive mechanism 14 through a transmission mechanism.
[0008] Furthermore, the transmission mechanism includes an anti-reverse device 143, which locks the direction of movement of the injection drive mechanism 14 during injection.
[0009] Furthermore, the anti-reverse device 143 includes a waist-shaped through hole 144 that is linked to the injection drive mechanism 14. When injection is performed, the shape of the waist-shaped through hole 144 restricts the reverse movement of the injection drive mechanism 14.
[0010] Furthermore, the injection drive mechanism 14 includes a screw 142 and a piston threadedly connected to the screw 142. The rotation of the screw 142 is converted into the axial movement of the piston to complete the injection.
[0011] Furthermore, the dose indication component includes a dose dial support 60 and a dose display element 90. The dose dial support 60 engages with the fixing component 20 via ratchet teeth with beveled ends. The dose display element 90 is rotatably connected to the inner wall of the housing 10 via a rotating sliding structure, allowing it to maintain the continuity of visual indication while moving axially. The visual indication is displayed through a dose display window 13 provided in the housing, including the current dose and adjustment progress.
[0012] Furthermore, the rotary sliding structure includes a rotary slide rail, allowing the dose indication component to slide smoothly within the housing 10.
[0013] Furthermore, the feedback component includes an elastic damping element 70 configured to provide buffering and resistance feedback when the dose indication component engages with the fixation component 20.
[0014] Furthermore, the elastic damping element 70 is a torsion spring 70.
[0015] Furthermore, the fixing component 20 is detachably connected to the housing 10 via a snap-fit structure, which includes at least one protrusion 21 and a corresponding groove 11 to enhance assembly stability.
[0016] The beneficial effects of this utility model are as follows: This utility model proposes a dosage adjustment and sound feedback structure for adjusting an injection pen, including a housing 10, an adjustment mechanism, a dosage indicator component, and a feedback component. The near end of the housing 10 is provided with an injection drive mechanism 14, and the far end of the housing 10 is provided with a fixing component 20. The dosage indicator component and the fixing component 20 are connected by an engagement structure. During the adjustment process, the engagement structure generates perceptible tactile and auditory feedback. When the adjustment knob 50 is rotated clockwise, the angle between the contact surfaces of the teeth of the dosage indicator component and the fixing component 20 is α, and the angle α is set to 10°-45°. The engagement structure provides a smooth guiding angle to reduce resistance. When the adjustment knob 50 is rotated counterclockwise, when the teeth on the end face of the dosage indicator component and the fixing component 20 engage, the angle between the contact surfaces of the teeth of the dosage indicator component and the fixing component 20 is θ, and the angle θ is set to 60°-90°. This prevents the dosage indicator component from retracting after the dosage setting is completed, achieving self-locking. Attached Figure Description
[0017] Figure 1 This is a cross-sectional view of the injection pen of this utility model.
[0018] Figure 2This is an exploded view of the overall dosage adjustment and sound feedback structure of the injection pen of this utility model.
[0019] Figure 3 This is a cross-sectional view of the dosage adjustment and sound feedback structure of the injection pen of this utility model.
[0020] Figure 4 This is a cross-sectional view of the right side of the adjustment knob and screw sleeve of the dosage adjustment and sound feedback structure of the injection pen of this utility model.
[0021] Figure 5 This is a sectional view of the side of the dose scale support and fixing component connecting the dose adjustment and sound feedback structure of the injection pen of this utility model.
[0022] Figure 6 for Figure 5 A magnified view of a portion of the image.
[0023] Figure 7 To display a 3D view of the stand.
[0024] Figure 8 This is a diagram showing the connection structure between the injection drive mechanism and the screw.
[0025] Figure 9 Diagram showing the connection structure between the anti-reverse mechanism and the screw.
[0026] Explanation of main component symbols
[0027] Housing 10; First slot 11; First notch 12; Dosage display window 13; Injection drive mechanism 14; Screw bracket 141; Screw 142; Anti-reverse mechanism 143; Waist-shaped through hole 144; Fixing assembly 20; First hook 21; First protrusion 22; First torsion spring mounting seat 23; Screw sleeve 30; Second rib 31; Third rib 32; Spring washer 40; Adjustment knob 50; Third groove 51; Dosage scale bracket 60; First rib 61; Second torsion spring mounting seat 62; Second groove 63; Torsion spring 70; Bracket return spring 80; Dosage display element 90; First groove 91.
[0028] The following detailed description, in conjunction with the accompanying drawings, will further illustrate this utility model. Detailed Implementation Example 1:
[0029] like Figure 1 and Figure 3-5As shown, a dosage adjustment and sound feedback structure for an injection pen includes a housing 10. The front end of the housing 10 is a proximal end, and the rear end is a distal end. The proximal end of the housing 10 is provided with an injection drive mechanism 14, and the distal end of the housing 10 is provided with a fixing component 20. The fixing component 20 is sleeved with a screw sleeve 30. One end of the screw sleeve 30 passes through the fixing component 20 and connects to an adjustment knob 50. A dosage scale support 60 is sleeved around the outer periphery of the screw sleeve 30, and the dosage scale support 60 engages with the fixing component 20 via ratchet teeth with beveled ends. The screw sleeve 30 can only move axially back and forth relative to the adjustment knob 50 and the dosage scale support 60. The adjustment knob 50 is connected to the distal end of the housing 10 and can only rotate relative to the housing 10. A torsion spring 70 is provided between the screw sleeve 30 and the dosage scale support 60. One end is connected to the near end of the dosage scale bracket 60 close to the housing 10, and the other end is connected to the fixing component 20. A bracket return spring 80 is also provided between the front end of the connection between the dosage scale bracket 60 and the screw sleeve 30 and the injection drive mechanism 14. When the user rotates the adjustment knob 50 in the forward direction, the screw sleeve 30 and the dosage scale bracket 60 rotate synchronously. Since the dosage scale bracket 60 and the fixing component 20 are engaged by ratchet teeth with beveled ends, the dosage scale bracket 60 and the fixing component 20 rotate relative to each other under the action of the adjustment knob 50. Under the interaction of the beveled ends of the ratchet teeth, axial relative movement also occurs. Under the action of the bracket return spring 80, the teeth on the end faces of the dosage scale bracket 60 and the fixing component 20 will continuously collide and produce sound. Each rotation of one tooth causes the teeth on the end faces of the dosage scale bracket 60 and the fixing component 20 to collide and produce sound, which is one unit of measurement.
[0030] like Figure 6 As shown, when the adjustment knob 50 is rotated clockwise, the angle between the contact surfaces of the dose scale support 60 and the teeth on the end face of the fixing component 20 is α, which is set to 10°-45°. The α angle is gentle, and the rotation is relatively smooth. When the adjustment knob 50 is rotated counterclockwise, the angle between the contact surfaces of the dose scale support 60 and the teeth on the end face of the fixing component 20 is θ, which is set to 60°-90°. This can effectively prevent the dose scale support 60 from retracting after the dose setting is completed, thus achieving self-locking.
[0031] like Figure 2 and Figure 7As shown, the outer periphery of the fixing component 20 is provided with a plurality of first hooks 21, and the corresponding position of the distal end of the housing 10 is provided with a first slot 11 that engages with it. The first hooks 21 and the first slots 11 are matched and engaged. The outer periphery of the fixing component 20 is also provided with a first protrusion 22, and the corresponding position of the distal end of the housing 10 is provided with a first notch 12. When the housing 10 and the fixing component 20 are matched and installed, the first protrusion 22 engages with the first notch 12, thereby enhancing the connection between the fixing component 20 and the housing 10. The inner wall of the fixing component 20 is provided with A first torsion spring mounting base 23 is used to fix one end of the torsion spring. Multiple parallel first ribs 61 are provided on the outer periphery of the dose scale bracket 60 along the axial direction, for matching and connecting with the first groove 91 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 back and forth along the axial direction relative to the dose scale bracket 60. A dose display window 13 is provided at the housing 10, cooperating with the dose display element 90 to display the required injection dose and the injection volume during the injection process. A second groove 63 is provided on the inner wall of the dose scale bracket 60 near the proximal end of the housing 10, and a second rib 31 is provided at a corresponding position on the screw sleeve 30. The second groove 63 and the second rib 31 are matched and connected, so that the screw sleeve 30 can only move back and forth along the axial direction relative to the dose scale bracket 60.
[0032] The dosage scale support 60 is also provided with a second torsion spring mounting seat 62 near the proximal end of the housing 10, which is used to fix the other end of the torsion spring. It cooperates with the second torsion spring mounting seat 62 so that one end of the torsion spring 70 rotates with the dosage scale support 60 and remains stationary at the connection end with the second torsion spring mounting seat 62, thereby storing energy. The screw sleeve 30 is provided with a third rib 32 near the distal end of the housing 10. The inner wall of the adjustment knob 50 is provided with a third groove 51 at the corresponding position. The third groove 51 is matched and connected with the third rib 32 so that the screw sleeve 30 can only move back and forth along the axial direction relative to the adjustment knob 50.
[0033] like Figure 3 As shown, a spring washer 40 is provided between the second groove 63 and the bracket return spring 80 to reduce the resistance to rotation when adjusting the dosage.
[0034] like Figure 8-9As shown, the injection driving mechanism 14 includes a screw support 141 and a screw 142 sleeved with the screw support 141. The screw 142 passes through the screw support 141 and is sleeved with an anti-reverse mechanism 143 at its lower part. The anti-reverse mechanism 143 has a waist-shaped through hole 144 at its center. The cross-section of the body of the screw 142 is waist-shaped, so that the rotation of the anti-reverse mechanism 143 can drive the screw 142 to rotate. When injection begins, the lower part of the anti-reverse mechanism 143 engages with the screw sleeve 30. The screw sleeve 30 drives the anti-reverse mechanism 143 to rotate, thereby driving the screw 142 to rotate. At the same time, since the inner ring of the screw support 141 is a hollow structure and the inner wall of the inner ring is provided with internal threads, the inner ring is threadedly connected to the screw 142. The outer periphery of the screw support 141 is interference-fitted with the inner wall of the housing 10, so that the screw 142 can move towards the proximal end under the action of the inner ring thread when rotating.
[0035] The beneficial effects of this utility model are as follows: This utility model proposes a dosage adjustment and sound feedback structure for adjusting an injection pen, including a housing 10, an adjustment mechanism, a dosage indicator component, and a feedback component. The near end of the housing 10 is provided with an injection drive mechanism 14, and the far end of the housing 10 is provided with a fixing component 20. The dosage indicator component and the fixing component 20 are connected by an engagement structure. During the adjustment process, the engagement structure generates perceptible tactile and auditory feedback. When the adjustment knob 50 is rotated clockwise, the angle between the contact surfaces of the teeth of the dosage indicator component and the fixing component 20 is α, and the angle α is set to 10°-45°. The engagement structure provides a smooth guiding angle to reduce resistance. When the adjustment knob 50 is rotated counterclockwise, when the teeth on the end face of the dosage indicator component and the fixing component 20 engage, the angle between the contact surfaces of the teeth of the dosage indicator component and the fixing component 20 is θ, and the angle θ is set to 60°-90°. This prevents the dosage indicator component from retracting after the dosage setting is completed, achieving self-locking.
[0036] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.
Claims
1. A dosage adjustment and sound feedback structure for adjusting an injection pen, comprising a housing, an adjustment mechanism, a dosage indicator component, and a feedback component, wherein the front end of the housing is a proximal end, and the rear end of the housing is a distal end; the proximal end of the housing is provided with an injection drive mechanism, and the distal end of the housing is provided with a fixing component; the adjustment mechanism is linked to the injection drive mechanism via a rotatable adjustment knob, and the adjustment action triggers the displacement of the dosage indicator component; the dosage indicator component and the fixing component are connected via an engagement structure; during adjustment, the engagement structure generates perceptible tactile and auditory feedback; and the feedback component stores and releases energy during adjustment to enhance feedback perception, characterized in that: When the adjustment knob is turned clockwise, the angle between the contact surfaces of the teeth of the dose indicator component and the fixed component is α, which is set to 10°-45°. The meshing structure provides a smooth guiding angle to reduce resistance. When the adjustment knob is turned counterclockwise, the angle between the contact surfaces of the teeth of the dose indicator component and the fixed component is θ, which is set to 60°-90°. This prevents the dose indicator component from retracting after the dose setting is completed, thus achieving self-locking.
2. The dosage adjustment and sound feedback structure for adjusting the injection pen as described in claim 1, characterized in that: The adjustment mechanism also includes a screw sleeve that is linked to the adjustment knob, and the screw sleeve drives the injection drive mechanism through a transmission mechanism.
3. The dosage adjustment and sound feedback structure for adjusting the injection pen as described in claim 2, characterized in that: The transmission mechanism includes an anti-reverse device that locks the direction of motion of the injection drive mechanism during injection.
4. The dosage adjustment and sound feedback structure for adjusting the injection pen as described in claim 3, characterized in that: The anti-reverse device includes a waist-shaped through-hole that is linked to the injection drive mechanism. When injection is performed, the shape of the waist-shaped through-hole restricts the reverse movement of the injection drive mechanism.
5. The dosage adjustment and sound feedback structure for adjusting the injection pen as described in claim 4, characterized in that: The injection drive mechanism includes a screw and a piston threadedly connected to the screw. The rotation of the screw is converted into the axial movement of the piston to complete the injection.
6. The dosage adjustment and sound feedback structure for adjusting the injection pen as described in claim 5, characterized in that: The dose indication assembly includes a dose dial support and a dose display element. The dose dial support engages with a fixing assembly via ratchet teeth with beveled ends. The dose display element is rotatably connected to the inner wall of the housing via a rotating sliding structure, allowing it to maintain the continuity of visual indication while moving axially. The visual indication is displayed through a dose display window located in the housing, including the current dose and adjustment progress.
7. The dosage adjustment and sound feedback structure for adjusting the injection pen as described in claim 6, characterized in that: The rotary sliding structure includes a rotary slide rail, which allows the dose indication component to slide smoothly within the housing.
8. The dosage adjustment and sound feedback structure for adjusting the injection pen as described in claim 1, characterized in that: The feedback component includes an elastic damping element configured to provide buffering and resistance feedback when the dose indication component engages with the fixation component.
9. The dosage adjustment and sound feedback structure for adjusting the injection pen as described in claim 8, characterized in that: The elastic damping element is a torsion spring.
10. The dosage adjustment and sound feedback structure for adjusting the injection pen as described in claim 9, characterized in that: The fixing component is detachably connected to the housing via a snap-fit structure, which includes at least one protrusion and a corresponding groove.