Key assembly and injection device

Abstract

The utility model relates to medical instrument technical field discloses a kind of button assembly and injection device, button assembly includes shell, button and support, shell is equipped with first mounting hole, one end of button has flexible key cap, flexible key cap is arranged and partially protrudes in first mounting hole, support is at least part structure inside flexible key cap, and cooperate the inner peripheral wall of first mounting hole and hold limit flexible key cap, the outer peripheral wall of flexible key cap and the inner peripheral wall of first mounting hole sealing abut, effectively avoid the infiltration of external accumulated water, when simultaneously, operator presses flexible key cap, press key cap due to the support of support, so that the lateral edge of flexible key cap does not occur concave to shell, to improve the waterproof effect of button assembly, ensure the normal work of injection device.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a button assembly and an injection device. Background Technology

[0002] Currently, medical injection devices typically include a control unit and an injection needle. A button assembly is mounted on one end of the control unit, and the movement of the injection needle and the injection rate are controlled via buttons on this assembly. Due to the working environment, water can easily accumulate on the surface of the button assembly. This water can then seep into the control unit through the gap between the button assembly's housing and the buttons, thus affecting the normal operation of the injection device. Utility Model Content

[0003] The main purpose of this invention is to provide a button assembly and an injection device, which aims to solve the problem that the existing button assemblies have poor waterproof performance and easily affect the normal operation of the injection device itself.

[0004] To solve the above problems, this utility model proposes a button assembly, comprising:

[0005] The housing has a first mounting hole;

[0006] A button, one end of which has a flexible keycap, the flexible keycap passing through and partially extending out of the first mounting hole; and

[0007] The bracket has at least a portion of its structure located inside the flexible keycap and engages with the inner peripheral wall of the first mounting hole to clamp and limit the flexible keycap. The outer peripheral wall of the flexible keycap is in sealing contact with the inner peripheral wall of the first mounting hole.

[0008] In one embodiment, the bracket includes a first base and an abutment portion, the other end of the key is connected to the first base, one end of the abutment portion is connected to the first base, and the other end is arranged around the lower part of the inner peripheral edge of the flexible keycap.

[0009] In one embodiment, the button includes a pressing member and a tactile switch. The tactile switch is located inside the flexible keycap and abuts against the inner end face of the flexible keycap. The pressing member includes a second base and a pressing part. One end of the pressing part is connected to the second base, and the other end forms the flexible keycap. The second base has a first annular groove at one end facing the pressing part, and a first annular protrusion is correspondingly formed inside the housing. The first annular protrusion is engaged with the first annular groove.

[0010] In one embodiment, the first base has a second annular groove at one end facing the flexible keycap, and the second base has a corresponding second annular protrusion at one end away from the pressing part, the second annular protrusion being engaged with the second annular groove.

[0011] In one embodiment, the bracket has a second mounting hole that passes through the first base and the abutment portion. The tactile switch is disposed inside the second mounting hole, and the flexible keycap is fitted onto the edge of the opening of the second mounting hole.

[0012] In one embodiment, the tactile switch includes a third base and a transmission part. The inner end face of the flexible keycap is provided with an inner protrusion. The radial dimension of the transmission part is smaller than the radial dimension of the third base. One end of the transmission part is connected to the third base, and the other end abuts against the inner protrusion.

[0013] In one embodiment, the flexible keycap and the housing are interference-fitted.

[0014] In one embodiment, the flexible keycap is made of transparent silicone.

[0015] In one embodiment, the button assembly further includes a light source, and the flexible keycap is provided with an illuminated icon. When the light source is turned on, the illuminated icon is displayed.

[0016] This utility model also proposes an injection device, which includes the button assembly described above.

[0017] This utility model proposes a button assembly, including a housing, a button, and a bracket. The housing has a first mounting hole. One end of the button has a flexible keycap, which passes through and partially extends out of the first mounting hole. At least a portion of the bracket is located inside the flexible keycap and, in conjunction with the inner peripheral wall of the first mounting hole, clamps and limits the flexible keycap, ensuring a sealed contact between the outer peripheral wall of the flexible keycap and the inner peripheral wall of the first mounting hole, effectively preventing the infiltration of external water. Simultaneously, when the operator presses the flexible keycap, the bracket's support prevents the peripheral edge of the flexible keycap from concave relative to the housing, thus ensuring no installation gap is created between the flexible keycap and the housing due to pressing. This further prevents external water from entering the interior of the button assembly, thereby improving the waterproof performance of the button assembly and ensuring the normal operation of the injection device. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without any inventive effort.

[0019] Figure 1 This is a schematic diagram of the structure of one embodiment of the button assembly of this utility model;

[0020] Figure 2 for Figure 1 Exploded view of the Chinese embodiment;

[0021] Figure 3 for Figure 1 A schematic diagram of the support structure in the Chinese embodiment;

[0022] Figure 4 for Figure 1 A schematic diagram of the button structure in the embodiment;

[0023] Figure 5 for Figure 1 A schematic diagram of the tactile switch in the embodiment;

[0024] Figure 6 for Figure 1 A cross-sectional view of the Chinese embodiment.

[0025] Explanation of icon numbers:

[0026] 10. Housing; 11. Outer shell; 111. First mounting hole; 112. First annular protrusion; 12. Glass cover plate; 121. Clearance hole; 20. Button; 21. Pressing element; 211. Second base; 2111. First annular groove; 2112. Second annular protrusion; 212. Pressing part; 213. Flexible keycap; 2131. Inner protrusion; 2132. Light indicator icon; 22. Tactile switch; 221. Third base; 222. Transmission part; 30. Bracket; 31. First base; 311. Second annular groove; 32. Abutment part; 33. Second mounting hole; 40. Light source element;

[0027] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without inventive effort are within the protection scope of the present utility model.

[0029] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0030] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0031] Currently, medical infusion pumps typically consist of a control unit and an injection needle. A button assembly is mounted on one end of the control unit, and the movement of the injection needle and the injection rate are controlled via buttons on this assembly. Due to the working environment, water can easily accumulate on the surface of the button assembly. This water can then seep into the control unit through the gap between the button assembly's housing and the button, thus affecting the normal operation of the infusion device.

[0032] To address the aforementioned issues, this utility model proposes a button assembly, aiming to resolve the problem that existing button assemblies have poor waterproofing performance and can easily affect the normal operation of the injection device itself.

[0033] like Figure 1 , Figure 2 and Figure 6In one embodiment, the button assembly includes a housing 10, a button 20, and a bracket 30. The housing 10 has a first mounting hole 111. One end of the button 20 has a flexible keycap 213, which passes through and partially extends out of the first mounting hole 111. At least a portion of the bracket 30 is located inside the flexible keycap 213 and cooperates with the inner peripheral wall of the first mounting hole 111 to clamp and limit the flexible keycap 213. The outer peripheral wall of the flexible keycap 213 is in sealing contact with the inner peripheral wall of the first mounting hole 111.

[0034] In this embodiment, the medical injection device mainly includes a control body and an injection needle. The housing 10 is the panel structure of the control body, which mainly includes an outer shell 11 and a glass cover 12. The outer shell 11 is the core supporting component of the housing 10, and its material can be medical-grade engineering plastic. The surface of the outer shell 11 has a first mounting hole 111, and the interior has an installation space for accommodating the flexible keycap 213, the bracket 30, and other components. The glass cover 12 is fitted onto the top of the outer shell 11, and the glass cover 12 has a clearance hole 121 at the corresponding position of the first mounting hole 111, so that the flexible keycap 213 can pass through the clearance hole 121 and protrude partially. One end of the button 20 has a flexible keycap 213, and the other end is installed inside the housing 11. The flexible keycap 213 can be made of flexible materials such as silicone, with a preferred Shore hardness of 35-45 degrees, so that the flexible keycap 213 can ensure a soft feel when pressing, reduce hand fatigue of medical staff during long-term operation, and provide clear pressing feedback to avoid misjudgment of operation due to excessive softness. The bracket 30 is installed in the mounting space inside the housing 11. One end of the bracket is stably connected to the part of the button 20 located inside the housing 11, and the other end is a ring-shaped structure located inside the flexible keycap 213. This ring-shaped structure applies bidirectional pressure to the flexible keycap 213 in the radial direction in conjunction with the wall of the first mounting hole 111, ensuring that the flexible keycap 213 is always tightly fitted to the inner peripheral wall of the first mounting hole 111. This allows for seamless installation between the protruding part of the flexible keycap 213 and the housing 10, preventing water seepage. At the same time, the ring-shaped structure at the other end of the bracket 30 provides axial support for the flexible keycap 213, effectively preventing the peripheral edge of the flexible keycap 213 from concave when pressed, avoiding temporary gaps between the housing 10 and the flexible keycap 213, further preventing the penetration of external water, ensuring that the core components of the injection device, such as the control circuit and motor drive module, are not damaged by moisture, ensuring stable injection rate and precise needle movement, and maintaining patient medication safety.

[0035] The button assembly proposed in this utility model includes a housing 10, a button 20, and a bracket 30. The housing 10 has a first mounting hole 111. One end of the button 20 has a flexible keycap 213, which passes through and partially extends out of the first mounting hole 111. At least a portion of the bracket 30 is located inside the flexible keycap 213 and, in conjunction with the inner peripheral wall of the first mounting hole 111, clamps and limits the flexible keycap 213, ensuring a sealed contact between the outer peripheral wall of the flexible keycap 213 and the inner peripheral wall of the first mounting hole 111, effectively preventing the infiltration of external water. Simultaneously, when the operator presses the flexible keycap 213, the support of the bracket 30 prevents the peripheral edge of the flexible keycap 213 from concave relative to the housing 10, thus ensuring that no installation gap is created between the flexible keycap 213 and the housing 10 due to pressing. This further prevents external water from entering the interior of the button assembly, thereby improving the waterproof effect of the button assembly and ensuring the normal operation of the injection device.

[0036] like Figures 1 to 3 and Figure 6 In one embodiment, the bracket 30 includes a first base 31 and an abutment portion 32. The other end of the button 20 is connected to the first base 31, one end of the abutment portion 32 is connected to the first base 31, and the other end is arranged around the lower edge of the inner periphery of the flexible keycap 213.

[0037] In this embodiment, the first base 31 and the abutment portion 32 are manufactured as a single unit to ensure the stability of their connection. The first base 31 is a ring-shaped structure with a certain thickness, and the abutment portion 32 is a cylindrical structure, both concentrically arranged. The peripheral contour of the abutment portion 32 matches the peripheral contour of the end face of the flexible keycap 213, ensuring that the abutment portion 32 can evenly support all positions of the edge of the flexible keycap 213 when pressed, avoiding uneven deformation of the keycap due to insufficient local support. This ensures that the outer peripheral wall of the flexible keycap 213 and the inner peripheral wall of the first mounting hole 111 always maintain a uniform sealing abutment force, without the generation of local gaps, further improving the waterproof effect.

[0038] like Figures 1 to 4 and Figure 6 In one embodiment, the button 20 includes a pressing member 21 and a tactile switch 22. The tactile switch 22 is located inside the flexible keycap 213 and abuts against the inner end face of the flexible keycap 213. The pressing member 21 includes a second base 211 and a pressing part 212. One end of the pressing part 212 is connected to the second base 211, and the other end forms the flexible keycap 213. The second base 211 has a first annular groove 2111 at one end facing the pressing part 212. A first annular protrusion 112 is correspondingly provided inside the housing 10. The first annular protrusion 112 is engaged with the first annular groove 2111.

[0039] In this embodiment, the button 20 specifically includes a pressing member 21 and a tactile switch 22. Specifically, the pressing member 21 adopts an integrally formed structure of a second base 211 and a pressing part 212. Parts of the structure of the second base 211 and the pressing part 212 are located inside the housing 10. The protruding part of the pressing part 212 serves as a flexible keycap 213 for the operator to press. The tactile switch 22 is a cylindrical structure with its trigger end facing upward and directly abutting against the inner end face of the flexible keycap 213 (the side near the second base 211). The other end is electrically connected to the circuit board inside the housing 10, ensuring that each press can be accurately triggered, adapting to the high response requirements of medical infusion pumps for operation commands. In addition, the second base 211 is a cylindrical structure with a first annular groove 2111 around its top. The inner wall of the first mounting hole 111 has a corresponding first annular protrusion 112. During installation, the pressing member 21 is pushed into the first mounting hole 111 from the inside to the outside of the outer shell 11, so that the first annular protrusion 112 is squeezed into the first annular groove 2111, forming a "ring protrusion-ring groove" snap-fit ​​structure, which firmly fixes the pressing member 21 to the shell 10, further avoiding the installation gap between the two. At the same time, even if a small amount of water seeps into the shell 10, the water will only enter the first annular groove 2111 and will not affect other electrical components, further improving the waterproof performance of the button assembly.

[0040] like Figures 1 to 4 and Figure 6 In one embodiment, a second annular groove 311 is provided at one end of the first base 31 facing the flexible keycap 213, and a second annular protrusion 2112 is provided at one end of the second base 211 away from the pressing part 212, and the second annular protrusion 2112 is engaged with the second annular groove 311.

[0041] In this embodiment, the second annular groove 311 is formed at one end of the first base 31 facing the flexible keycap 213 (i.e., the upper surface of the first base 31), creating an annular groove structure. Simultaneously, a second annular protrusion 2112 is correspondingly provided at the bottom end of the second base 211. Through the engaging engagement of the second annular groove 311 and the second annular protrusion 2112, the lower surface of the second base 211 and the upper surface of the first base 31 are tightly fitted without any looseness, ensuring that the pressing component 21 and the bracket 30 maintain a stable connection even after long-term high-frequency pressing. Furthermore, the second annular groove 311 provides a space to accommodate accumulated water, forming a double waterproof structure with the first annular groove 2111, significantly improving the waterproof performance of the button assembly.

[0042] like Figures 1 to 4 and Figure 6 In one embodiment, the bracket 30 has a second mounting hole 33, which passes through the first base 31 and the abutment portion 32. The tactile switch 22 is disposed inside the second mounting hole 33, and the flexible keycap 213 is fitted onto the edge of the opening of the second mounting hole 33.

[0043] In this embodiment, the second mounting hole 33 is located at the center of the bracket 30 and extends through the first base 31 and the abutment portion 32, forming a cylindrical channel that runs vertically through the body. The size of this channel is slightly larger than the radial dimension of the tactile switch 22, ensuring that the tactile switch 22 can be accurately embedded without any wobbling. The upper edge of the second mounting hole 33 (located on the side of the abutment portion 32 facing the flexible keycap 213) is chamfered to ensure a tight fit between the flexible keycap 213 and the edge of the hole when it is installed, while also preventing sharp edges from scratching the flexible keycap 213. At the same time, the tactile switch 22 is completely placed inside the bracket 30, achieving physical protection and sealing for the tactile switch 22, while also improving the structural compactness of the button assembly.

[0044] like Figure 5 and Figure 6 In one embodiment, the tactile switch 22 includes a third base 221 and a transmission part 222. The inner end face of the flexible keycap 213 is provided with an inner protrusion 2131. The radial dimension of the transmission part 222 is smaller than the radial dimension of the third base 221. One end of the transmission part 222 is connected to the third base 221, and the other end abuts against the inner protrusion 2131.

[0045] In this embodiment, the third base 221 and the transmission part 222 are manufactured as a single unit to ensure the stability of their connection. The third base 221 is a cylindrical structure that serves to fix and support the tactile switch 22. The transmission part 222 is also a cylindrical structure, serving as the trigger force transmission component of the tactile switch 22, and is coaxially arranged with the third base 221. Its radial dimension is smaller than that of the third base 221, forming a stepped structure. An inner protrusion 2131 is formed at the center of the inner end face of the flexible keycap 213. This inner protrusion 2131 is directly opposite to the transmission part 222. Through the precise cooperation between the inner protrusion 2131 and the transmission part 222, the trigger transmission path of "tactile switch 22 - flexible keycap 213" is optimized. While maintaining the original waterproof performance, the trigger reliability and anti-displacement ability are greatly improved, and the pressing feel of the operator is also improved.

[0046] like Figure 6 In one embodiment, the flexible keycap 213 and the housing 10 are interference fit.

[0047] In this embodiment, the flexible keycap 213 and the housing 10 are fitted with an interference fit to ensure that the flexible keycap 213 only deforms axially and does not shift laterally when pressed. This avoids misalignment of the trigger end and effectively prevents the generation of installation gaps, thereby improving the waterproof performance of the key assembly.

[0048] In one embodiment, the flexible keycap 213 is made of transparent silicone.

[0049] In this embodiment, the flexible keycap 213 is made of transparent silicone material. While retaining the core characteristics of traditional silicone material such as waterproofness, disinfection resistance, and good elasticity, the light transmittance and visibility of the flexible keycap 213 are improved.

[0050] Furthermore, such as Figure 2 and Figure 6 The button assembly also includes a light source 40, and the flexible keycap 213 is equipped with a light display icon 2132. When the light source 40 is turned on, the light display icon 2132 is displayed.

[0051] In this embodiment, the light source 40 can be an LED light source, which is mounted on a circuit board inside the housing 10 and coaxially aligned with the backlit icon 2132 of the flexible keycap 213 to ensure that the light can be accurately projected onto the icon area. The backlit icon 2132 is laser-engraved on the end face of the flexible keycap 213 using a laser engraving process. When the light source 40 is turned on, the icon can be clearly displayed, so that the operator can quickly identify the function and position of the key 20.

[0052] This utility model also proposes an injection device (not shown), which includes a button assembly. The specific structure of the button assembly is as described in the above embodiments. Since the button assembly adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0053] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A button assembly, characterized in that, The button assembly includes: The housing has a first mounting hole; A button, one end of which has a flexible keycap, the flexible keycap passing through and partially extending out of the first mounting hole; and The bracket has at least a portion of its structure located inside the flexible keycap and engages with the inner peripheral wall of the first mounting hole to clamp and limit the flexible keycap. The outer peripheral wall of the flexible keycap is in sealing contact with the inner peripheral wall of the first mounting hole.

2. The button assembly as described in claim 1, characterized in that, The bracket includes a first base and an abutment portion. The other end of the key is connected to the first base, and one end of the abutment portion is connected to the first base, while the other end is arranged around the lower edge of the inner periphery of the flexible keycap.

3. The button assembly as described in claim 2, characterized in that, The button includes a pressing element and a tactile switch. The tactile switch is located inside the flexible keycap and abuts against the inner end face of the flexible keycap. The pressing element includes a second base and a pressing part. One end of the pressing part is connected to the second base, and the other end forms the flexible keycap. The second base has a first annular groove at one end facing the pressing part, and a corresponding first annular protrusion is formed inside the housing. The first annular protrusion is engaged with the first annular groove.

4. The button assembly as described in claim 3, characterized in that, The first base has a second annular groove at one end facing the flexible keycap, and the second base has a corresponding second annular protrusion at one end away from the pressing part, the second annular protrusion being engaged with the second annular groove.

5. The button assembly as described in claim 3, characterized in that, The bracket has a second mounting hole that passes through the first base and the abutment portion. The tactile switch is located inside the second mounting hole, and the flexible keycap is fitted onto the edge of the opening of the second mounting hole.

6. The button assembly as described in claim 3, characterized in that, The tactile switch includes a third base and a transmission part. The inner end face of the flexible keycap is provided with an inner protrusion. The radial dimension of the transmission part is smaller than the radial dimension of the third base. One end of the transmission part is connected to the third base, and the other end abuts against the inner protrusion.

7. The button assembly as described in any one of claims 1 to 6, characterized in that, The flexible keycap and the housing are interference fit.

8. The button assembly as described in any one of claims 1 to 6, characterized in that, The flexible keycaps are made of transparent silicone.

9. The button assembly as described in claim 8, characterized in that, The button assembly also includes a light source, and the flexible keycap is equipped with a light-up icon. When the light source is turned on, the light-up icon is displayed.

10. An injection device, characterized in that, The injection device includes a button assembly as described in any one of claims 1 to 9.

Images