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RU-2861280-C1 - INJECTION PEN

RU2861280C1RU 2861280 C1RU2861280 C1RU 2861280C1RU-2861280-C1

Abstract

FIELD: medical instrument engineering. SUBSTANCE: invention relates to an injection pen. The injection pen comprises a button mechanism and a dose adjustment mechanism. The button mechanism comprises a button assembly. The button assembly comprises a button body and a button cover, and the button cover is detachably connected to the button body. The dose adjustment mechanism comprises a force rod. The button body comprises an interaction portion extending downwards, and the interaction portion has a first limiting surface facing upwards. The force rod comprises a hook-shaped portion extending upwards, and the hook-shaped portion has a second limiting surface facing downwards. The button cover comprises a pin portion extending downwards, and the pin portion is configured to be inserted inside the hook-shaped portion to push the hook-shaped portion outwards in the radial direction to abut the second limiting surface against the first limiting surface. EFFECT: reliable connection between the button mechanism and the dose adjustment mechanism by optimising the design of the interaction between the button mechanism and the dose adjustment mechanism. 10 cl, 10 dwg

Inventors

  • XIONG, Changyan
  • LI, Huashun
  • HE, SIXIAN

Dates

Publication Date
20260504
Application Date
20250106
Priority Date
20240116

Claims (13)

  1. 1. A syringe pen comprising a push button mechanism and a dose adjustment mechanism, wherein the push button mechanism comprises a push button assembly, wherein the push button assembly comprises a push button body and a push button cover, and wherein the push button cover is removably connected to the push button body; wherein the dose adjustment mechanism comprises a power rod;
  2. the button body comprises an interaction portion extending downward, and the interaction portion has a first limiting surface facing upward; the power rod comprises a hook-shaped portion extending upward, and the hook-shaped portion has a second limiting surface facing downward; and
  3. The button cover comprises a pin section extending downwards, and the pin section is configured to be inserted into the hook section to push the hook section outward in a radial direction to abut the second limiting surface against the first limiting surface.
  4. 2. The syringe pen of claim 1, wherein the power rod is provided with two or more hook-shaped portions that are spaced apart in a circumferential direction; and wherein each hook-shaped portion comprises a rod portion and a hook at an upper end of the rod portion, and the upper end of the rod portion extends outward in a radial direction to form a hook.
  5. 3. The syringe pen according to claim 2, in which the lower ends of the rod sections of the hook sections are connected by means of a connecting section into a single whole and the upper section of each rod section is capable of elastic deformation in the radial direction.
  6. 4. The syringe pen according to claim 2, in which an inclined guide surface is provided at the upper end of the inner wall of each rod section of the hook section, configured to guide the insertion of the pin section.
  7. 5. A syringe pen according to any one of paragraphs 2-4, in which the hook-shaped sections are located around the central axis of the power rod and the central axis of the pin-shaped section coincides with the central axis of the power rod.
  8. 6. A syringe pen according to any one of claims 1-4, wherein the middle region of the button body is recessed downwards to form an interaction area, wherein the interaction area has a through hole through which the hook-shaped area passes, and the first limiting surface is an annular surface.
  9. 7. A syringe pen according to any one of paragraphs 1-4, in which the pin section is hollow.
  10. 8. A syringe pen according to any one of paragraphs 1-4, in which the button cover is removably connected to the button body by a snap fit.
  11. 9. A syringe pen according to any one of paragraphs 1-4, further comprising a head assembly, wherein between the head assembly and the power rod there is a circumferential direction structure configured to cause the power rod to rotate by means of the head assembly when the head assembly rotates; and
  12. The button assembly is connected to the head assembly with the possibility of sliding the button assembly in the axial direction and is configured to drive the power rod with its movement downwards when the button assembly moves downwards relative to the head assembly to release from the circumferential retention between the power rod and the head assembly.
  13. 10. The syringe pen of claim 9, wherein the button mechanism further comprises a return elastic element between the button assembly and the head assembly.

Description

[0001] This application claims priority to Chinese Patent Application No. 202410058059.X, "INJECTION PEN", filed on January 16, 2024, in the National Intellectual Property Administration of China, which is incorporated herein by reference in its entirety. FIELD OF TECHNOLOGY TO WHICH THE INVENTION RELATES [0002] The present application relates to the field of medical instrument technology and, in particular, to a syringe pen. BACKGROUND OF THE INVENTION Injectable insulin therapy is a widely used treatment method in clinical practice, leading to the development of the insulin injection pen. The pen is reusable and allows precise regulation of the injected dose, requiring only replacement of the insulin cartridge. Besides insulin, the pen can also be used to inject other medications. [0004] A prior art syringe pen includes an upper housing assembly of the syringe pen and a lower cap of the syringe pen. The upper housing assembly of the syringe pen includes a button mechanism, a dose adjustment mechanism and a transmission mechanism, and the lower cap of the syringe pen is configured to adjust the capacity of the cartridge. Kinetic energy can be accumulated by actuating the dose adjustment mechanism, and the kinetic energy accumulated in the dose adjustment mechanism can be released by pressing the button mechanism to push the container stopper into the cartridge capacity via the transmission mechanism, thereby performing an injection of the drug. [0005] In practical work, it was found that the interaction design of the existing button mechanism and the dose adjustment mechanism tends to weaken, and the button of the button mechanism tends to weaken, resulting in the syringe pen becoming unusable. ESSENCE OF THE INVENTION [0006] The aim of the present application is to provide a syringe pen that can ensure the reliability of the connection between the button mechanism and the dose adjustment mechanism by optimizing the design of the interaction of the button mechanism and the dose adjustment mechanism. [0007] To solve the above-mentioned technical problem, a syringe pen is proposed that includes a push-button mechanism and a dose adjustment mechanism. The push-button mechanism includes a push-button assembly comprising a push-button body and a push-button cover, detachably connected to each other. The dose adjustment mechanism includes a power rod. [0008] The button body includes an interaction portion extending downward, and the interaction portion has a first limiting surface facing upward. The power rod includes a hook-shaped portion extending upward, and the hook-shaped portion has a second limiting surface facing downward. [0009] The button cover includes a pin portion extending downward, and the pin portion can be inserted inside the hook portion to move the hook portion outward in a radial direction such that the second limiting surface abuts the first limiting surface. [0010] In one embodiment of the invention, the power rod is provided with two or more hook-shaped portions that are arranged at intervals in the circumferential direction. The hook-shaped portion includes a rod portion and a hook at the upper end of the rod portion, and the upper end of the rod portion extends outward in the radial direction to form the hook. [0011] In one embodiment of the invention, the lower ends of the rod portions of the hook portions are connected by means of a connecting portion into a single structure, and the upper section of the rod portion has the ability to elastically deform in the radial direction. [0012] In one embodiment of the invention, an inclined guide surface is provided at the upper end of the inner wall of the rod portion of the hook portion and is configured to guide the insertion of the pin portion. [0013] In one embodiment of the invention, the hook portions are arranged around the central axis of the power rod, and the central axis of the pin portion coincides with the central axis of the power rod. [0014] In one embodiment of the invention, the middle region of the button body is recessed downward to form an interaction portion. The interaction portion has a through hole through which the hook-shaped portion passes, and the first limiting surface is an annular surface. [0015] In one embodiment of the invention, the pin portion has a hollow structure. [0016] In one embodiment of the invention, the button cover is removably connected to the button body in a snap-fit manner. [0017] In one embodiment of the invention, the syringe pen further includes a head assembly. Between the head assembly and the power rod, there is a circumferential guiding structure that is configured to impart to the head assembly the ability to drive the power rod into rotation when the head assembly rotates. [0018] The button assembly is connected to the head assembly so as to be slidable in an axial direction and is configured to cause the power rod to move downwardly when the button assembly moves downwardly relative t