Shell assembly structure of disposable injection pen

Abstract

According to the shell assembling structure of the disposable injection pen, a lower shell part is of a cylindrical structure with the two ends penetrating through, meanwhile, an inner barrel part is concentrically arranged in the middle position where the lower shell part is located, and a penetrating channel is formed in the middle where the inner barrel part is located and used for bearing an injector body part; a gap channel is formed between the inner cylinder part and the inner wall of the lower shell part and used for penetrating arrangement of the protection shell, meanwhile, a limiting assembly is arranged between the protection shell and the inner wall where the lower shell part is located in the axis direction, and the displacement distance of the protection shell moving in the axis direction is limited through the limiting assembly. The pen cap part is used for covering the front end part of the lower shell part; the upper housing part is used for forming injection of liquid contained in the injector body part in the lower housing part. According to the whole device, the needle position of the injector body part can be protected through the protective shell, no sensor equipment is needed, only connection of a mechanical structure is needed, and the fault rate is lower.

Description

Technical Field

[0001] The present invention belongs to the technical field of medical equipment, and in particular relates to a shell assembly structure of a disposable injection pen. Background Art

[0002] An injection pen is a device used to inject medications, typically consisting of a pen-shaped housing that holds the injection. Convenient, accurate, and easy to carry, using an injection pen to inject medications can improve patients' self-management abilities and quality of life. When using an injection pen to inject medications, careful attention should be paid to the selection of the injection site, the accuracy of the injection dose, and the timing of the injection. Patients should also regularly monitor their hormone levels and adjust their medication dosage based on their doctor's recommendations.

[0003] In Chinese patent application publication number CN107019827A, an injection pen is described, comprising: an operating assembly for injecting medication; an electronic sensing module, located within and electrically connected to the operating assembly, for recording injection dosage and injection time information; and a wireless communication module, located within and electrically connected to the electronic sensing module, for transmitting the injection dosage and injection time information to an external server or client. However, this structure requires a large number of electronic sensors in actual use, requiring wiring during use and assembly. Any wiring failure could pose a safety hazard.

[0004] At the same time, in the Chinese patent application publication number CN111569192A, a safety injection pen is disclosed, which includes an injection pen tube, a pen cap, a refill holder, an injection refill and an injection needle structure. The injection needle structure includes a fixed sleeve, a rotating sleeve and a limiting sleeve. The limiting sleeve is provided with an injection port. The rotating sleeve is provided with a first clamping sleeve and a second clamping sleeve. The first clamping sleeve is fixed with a first knob, and the second clamping sleeve is fixed with a second knob. The outer walls of the first knob and the second knob are both provided with an external thread structure. The rubber membrane at the lower end plays a protective role. The rubber membrane can prevent the needle from being directly exposed, but this rubber membrane itself also has the risk of contamination. Therefore, when it is directly penetrated, it is also easy to cause contamination of the needle. Summary of the Invention

[0005] In view of the deficiencies in the prior art, the object of the present invention is to provide a housing assembly structure for a disposable injection pen, which solves the above-mentioned technical problems in the prior art.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] A housing assembly structure for a disposable injection pen, comprising a lower housing component, an upper housing component, a pen cap component, and a syringe body component.

[0008] The lower housing member is a cylindrical structure with two ends passing through. At the same time, an inner cylinder member is concentrically arranged in the middle of the lower housing member, so that the middle part of the inner cylinder member is a through channel for supporting the syringe body member, and a gap channel is formed between the inner cylinder member and the inner wall of the lower housing member for the through arrangement of the protective shell. At the same time, a limiting assembly is provided between the protective shell and the inner wall of the lower housing member along the axial direction, and the displacement distance of the protective shell along the axial direction is limited by the limiting assembly;

[0009] The pen cap member forms a cover for the front end portion of the lower housing member;

[0010] The upper housing member is used to inject the liquid contained in the syringe body member located in the lower housing member;

[0011] Furthermore, the pen cap is an integrally formed structure, and a symmetrical and extended outward clamping claw is provided at the middle position of the pen cap, so that the clamping claw can clamp the outer wall of the sleeve part at the needle position of the syringe body.

[0012] Furthermore, an inwardly offset barb is formed on the inner side of the front end portion where the clamping claw is located, thereby clamping the end position of the sleeve member.

[0013] Furthermore, the pen cap member is connected to the front end portion of the lower shell member by a snap-on cover.

[0014] Furthermore, the protective shell includes an annular ring at the bottom and a support rod member extending outward along the axial direction of the rear end and symmetrically arranged, so that the annular ring forms a wrapping for the lower end of the syringe body, and the support rod member is arranged along the direction of the gap channel between the inner wall of the lower shell member and the inner cylinder member.

[0015] Furthermore, a limit block is symmetrically provided at the front end portion of the inner wall where the protective shell is located. When the protective shell is pushed forward, the limit block is used to squeeze the clamping claws of the pen cap inward, and at the same time, the barb at the front end portion of the clamping claws is embedded in the connection between the sleeve part and the needle of the syringe body, and they are clamped to each other, and when the pen cap part is pulled out, the sleeve part located on the needle of the syringe body is simultaneously pulled out.

[0016] Furthermore, the inner cylinder and the lower shell are an integral injection-molded structure, and a gap reserved between the inner cylinder and the lower shell is connected by a plurality of groups of legs, forming a gap channel in the vertical direction for the protective shell to pass through.

[0017] Furthermore, the limiting assembly includes a limiting protrusion located on the inner wall of the lower shell member, and a vertical limiting groove opened on the wall of the protective shell, so that the limiting protrusion is assembled in the limiting groove and at the same time limits the vertical movement of the protective shell where the limiting groove is located.

[0018] Furthermore, the limiting protrusion has a lower end surface with an arc-shaped transition structure and an upper end surface with a horizontal truncation structure. At the same time, the outer wall of the protective shell where the limiting groove is located is provided with an arc-shaped transition structure, so that the protective shell is implanted from the lower end portion where the lower shell member is located to the inner wall and relatively fixed.

[0019] Furthermore, a transparent window is provided on the outer wall of the lower shell member so that the outer wall of the syringe body member can be observed through the transparent window, and the limiting protrusion is arranged on the opposite side of the transparent window.

[0020] Beneficial effects of the present invention:

[0021] 1. The protective shell used in this device is implanted on the inner wall of the lower shell where the injection pen is located, which does not affect the load-bearing of the syringe body. In addition, the entire device can protect the needle position of the syringe body through the protective shell. No sensor equipment is required, only the connection of the mechanical structure is required, and the failure rate is lower.

[0022] 2. The pen cap used in this device forms a cover on the bottom of the lower shell part. At the same time, by pressing down the protective shell, the pen cap can clamp the sleeve part located on the needle of the syringe body part, and then directly pull out the whole part to realize that the sleeve part falls off from the needle of the syringe body part. After the protective shell is lifted, the needle is exposed for injection. After the protective shell falls, the needle is protected in the vertical direction, thereby avoiding the wrapping of the needle and avoiding damage caused by exposure.

[0023] 3. The lower shell member used in this device is internally provided with a concentrically arranged inner cylinder member for supporting the syringe body member. At the same time, the gap channel formed between the lower shell member and the inner cylinder member can be used for the passage of the protective shell without affecting the placement of the syringe body member.

[0024] 4. This device adopts a transparent window provided on the side wall of the lower shell for the user to directly observe the injection situation, making the application scenario more intuitive. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for describing the embodiments or the prior art.

[0026] Figure 1 is a schematic diagram of the overall structure of an injection pen according to an embodiment of the present invention;

[0027] Figure 2 2. It is a schematic diagram of the overall structure of the lower housing member according to an embodiment of the present invention;

[0028] Figure 3 is a schematic cross-sectional structural diagram of a lower housing member according to an embodiment of the present invention;

[0029] Figure 4 2 is a schematic structural diagram of a pen cap member according to an embodiment of the present invention;

[0030] Figure 5 2. It is a schematic structural diagram of a syringe body according to an embodiment of the present invention;

[0031] Figure 6 1 is a schematic diagram of the protective shell structure according to an embodiment of the present invention;

[0032] Figure 7 1 is a schematic diagram of the overall cross-sectional structure of an embodiment of the present invention;

[0033] Figure 8 This is a schematic diagram of the cross-sectional structure of the protective case of an embodiment of the present invention when pressed downward;

[0034] Figure 9 This is an embodiment of the present invention Figure 8 Schematic diagram of part of the structure at A1;

[0035] Figure 10 This is an embodiment of the present invention Figure 8 Schematic diagram of part of the structure at A2;

[0036] Figure 11 is a schematic diagram of the cross-sectional structure of the protective case of an embodiment of the present invention when it is lifted;

[0037] Figure 12 This is an embodiment of the present invention Figure 11 Schematic diagram of part of the structure at B1;

[0038] Figure 13 This is an embodiment of the present invention Figure 11 Schematic diagram of part of the structure at B2. DETAILED DESCRIPTION

[0039] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0040] like Figure 1 As shown, the embodiment of the present invention provides a housing assembly structure of a disposable injection pen, including a lower housing member 1, an upper housing member 2, a pen cap member 3, a syringe body member 4, and a protective shell 5.

[0041] like Figure 2 、 Figure 3 As shown, the lower shell member 1 is a cylindrical structure with both ends passing through, and an inner cylinder member 11 is concentrically arranged in the middle position of the lower shell member 1, so that the middle part of the inner cylinder member 11 is a through channel for supporting the syringe body member 4. Since the syringe body member 4 needs to be supported and assembled, the width of the upper and lower ends of the inner cylinder member 11 is smaller than the width of the upper and lower ends of the lower shell member 1. In this way, the lower shell member 1 can completely cover the outer periphery of the supported syringe body member 4. In order to ensure the overall external strength, the inner cylinder member 11 and the lower shell member 1 are an integral injection molding structure, and the gap reserved between the inner cylinder member 11 and the lower shell member 1 is connected and fixed by several groups of legs, and a gap channel for the protective shell 5 to pass through is formed in the vertical direction.

[0042] At this time, a gap channel is formed between the inner cylinder part 11 and the inner wall of the lower shell part 1, which is used to set the through-bearing of the protective shell 5. At the same time, a limiting component is set along the axial direction between the protective shell 5 and the inner wall of the lower shell part 1, and the displacement distance of the protective shell 5 moving along the axial direction is limited by the limiting component.

[0043] At this time, the limiting assembly includes a limiting protrusion 111 located on the inner wall of the lower shell part 1, and a vertical limiting groove 501 opened on the wall of the protective shell 5, so that during assembly, the limiting protrusion 111 is located in the limiting groove 501, and limits the vertical movement of the protective shell 5 where the limiting groove 501 is located, preventing the protective shell 5 from falling off in the vertical direction.

[0044] like Figure 7 As shown, and in order to facilitate assembly, the limiting protrusion 111 presents a curved transition structure on the lower end surface and a horizontal truncation structure on the upper end surface. At the same time, the outer wall of the protective shell 5 where the limiting groove 501 is located is provided with a curved transition structure. During assembly, the protective shell 5 is implanted from the lower end portion where the lower shell member 1 is located into the gap channel formed between the inner wall of the lower shell member 1 and the inner cylinder member 11. When the curved transition outer wall of the upper protective shell 5 where the limiting groove 501 is located contacts the curved transition structure on the lower end surface of the limiting protrusion 111, it can smoothly squeeze the area where the protective shell 5 is located, and continue to push the protective shell 5 into place. When the protective shell 5 is pulled up, the limiting protrusion 111 is in contact with the lower end face of the limiting groove 501 where the protective shell 5 is located (this structure is a cross-sectional structure). Unless there is a destructive force, the limiting protrusion 111 will not fall off from the limiting groove 501. When the protective shell 5 falls, the upper end face of the limiting protrusion 111 is a cross-sectional structure, and it is difficult to achieve separation between the two structures without using a destructive force on the upper end face of the limiting groove 501.

[0045] like Figure 6 As shown, the protective shell 5 comprises an annular ring 51 at the bottom and support rods 52 extending outwardly along the axis of the rear end and symmetrically arranged. The annular ring 51 forms a wrap around the lower end of the syringe body 4, which can reduce the destructive force directly caused by the lower end to the syringe body 4. At the same time, the support rods 52 are arranged along the direction of the gap channel between the inner wall of the lower shell member 1 and the inner cylinder member 11. At this time, a transparent window 101 is opened on the outer wall of the lower shell member 1, so that the outer wall of the syringe body 4 can be observed through the transparent window 101 (so as to observe the flow of the syringe body 4 inside the transparent window 101 during injection). At the same time, the limiting protrusion 111 is arranged on the opposite side of the transparent window 101, so that the limiting protrusion 111 and the transparent window 101 are on adjacent sides of the lower shell member 1 and do not affect each other.

[0046] like Figure 4 As shown, the pen cap member 3 forms a cover for the front end of the lower shell member 1; the pen cap member 3 is integrally formed, and a symmetrical and extended clamping claw 31 is provided at the middle position of the pen cap member 3, so that the clamping claw 31 forms a sleeve member 41 at the needle position of the syringe body 4 (the sleeve member 41 can cover the needle at the front end when assembled, and the specific structure is referred to Figure 5 ) The outer wall is clamped. At the same time, the inner side of the front end of the clamping claw 31 forms an inwardly offset barb to clamp the end position of the sleeve member 41 (refer to the initial state). Figure 8 、 Figure 9 、 Figure 10 , at this time the sleeve member 41 and the clamping jaw 31 are in a separated state).

[0047] like Figure 11-13As shown, at this time, the front end portion of the inner wall where the protective shell 5 is located is symmetrically provided with a limit block 511. When the protective shell 5 is pushed forward (i.e. pressed down), the limit block 511 is used to form an inward squeeze on the clamping claw 31 of the pen cap member 3 (at this time, the front end portion of the protective shell 5 is located in the gap between the inner wall where the pen cap member 3 is located and the clamping claw 31). At the same time, the barb at the front end portion of the clamping claw 31 is embedded in the connection between the sleeve member 41 and the needle of the syringe body member 4, and they are clamped to each other (the degree of this clamping is related to the depth of the downward pressure of the protective shell 5. The deeper the pressure is, the tighter the clamping claw 31 presses against the inner wall where the sleeve member 41 is located, until the clamping claw 31 is completely clamped at the end position where the sleeve member 41 is located). When the pen cap member 3 is pulled out, the clamping claw 31 is synchronously driven to be located at the end position of the syringe body member 4 The sleeve part 41 on the needle of the syringe body part 4 is pulled out (at this time, the pen cap part 3 is connected to the front end of the lower shell part 1 with a snap-on cover, and can be pulled out directly in the vertical direction. The clamping claw 31 has formed a clamping for the sleeve part 41 and is embedded in the upper part of the sleeve part 41. As the clamping claw 31 is pulled out, the sleeve part 41 is pulled out synchronously, and this pulling-out method will not affect the position of the needle). At this time, the downward pressure of the protective shell 5 is limited by the limiting action of the limiting protrusion 111. At the same time, the length of the lower end part of the extended protective shell 5 is lower than the height of the lowest end face of the needle of the syringe body part 4, which further ensures that the needle is protected from direct interference and impact from the side, making operation convenient and safer.

[0048] The upper housing member 2 is used to inject the liquid contained in the syringe body member 4 located in the lower housing member 1 .

[0049] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and modifications fall within the scope of the invention as claimed.

Claims

1. A housing assembly structure for a disposable injection pen, comprising a lower housing member (1), an upper housing member (2), a pen cap member (3), and a syringe body member (4), characterized in that: The lower shell member (1) is a cylindrical structure with two ends passing through, and an inner cylinder member (11) is concentrically arranged in the middle position of the lower shell member (1), so that the middle position of the inner cylinder member (11) is a through channel for supporting the syringe body member (4), and a gap channel is formed between the inner cylinder member (11) and the inner wall of the lower shell member (1) for the through arrangement of the protective shell (5), and a limiting assembly is arranged between the protective shell (5) and the inner wall of the lower shell member (1) along the axial direction, and the displacement distance of the protective shell (5) moving along the axial direction is limited by the limiting assembly; The pen cap member (3) forms a cover for the front end portion of the lower housing member (1); The upper housing part (2) is used to inject the liquid contained in the syringe body part (4) located in the lower housing part (1).

2. The housing assembly structure of the disposable injection pen according to claim 1, characterized in that: The pen cap member (3) is an integrally formed structure, and a clamping claw (31) is provided at a central position of the pen cap member (3) and is symmetrically extended outward, so that the clamping claw (31) can clamp the outer wall of the sleeve member (41) at the needle position of the syringe body (4).

3. The housing assembly structure of the disposable injection pen according to claim 2, characterized in that: The inner side of the front end portion where the clamping claw (31) is located forms an inwardly deflected barb to clamp the end position of the sleeve member (41).

4. The housing assembly structure of the disposable injection pen according to claim 1, characterized in that: The pen cap member (3) is connected to the front end portion of the lower housing member (1) by using a snap-on cover.

5. The housing assembly structure of the disposable injection pen according to claim 2, characterized in that: The protective shell (5) comprises an annular ring (51) at the bottom and a support rod (52) extending outwardly along the axial direction of the rear end and symmetrically arranged, so that the annular ring (51) forms a wrap around the lower end of the syringe body (4), and the support rod (52) is arranged along the gap channel between the inner wall of the lower shell (1) and the inner cylinder (11).

6. The housing assembly structure of the disposable injection pen according to claim 5, characterized in that: A limiting block (511) is symmetrically provided at the front end portion of the inner wall where the protective shell (5) is located. When the protective shell (5) is pushed forward, the limiting block (511) is used to form an inward squeeze on the clamping claw (31) of the pen cap member (3). At the same time, the barb at the front end portion where the clamping claw (31) is located is embedded in the connection between the sleeve member (41) and the needle of the syringe body member (4), and is clamped to each other. When the pen cap member (3) is pulled out, the sleeve member (41) located on the needle of the syringe body member (4) is simultaneously driven to be pulled out.

7. The housing assembly structure of a disposable injection pen according to claim 1, characterized in that: The inner cylinder (11) and the lower shell (1) are integrally formed by injection molding, and a gap reserved between the inner cylinder (11) and the lower shell (1) is connected by a plurality of groups of legs, forming a gap channel in the vertical direction for the protective shell (5) to pass through.

8. The housing assembly structure of a disposable injection pen according to claim 1, characterized in that: The limiting assembly comprises a limiting protrusion (111) located on the inner wall of the lower housing member (1), and a limiting groove (501) provided in a vertical direction on the wall of the protective shell (5), so that the limiting protrusion (111) is assembled in the limiting groove (501), and simultaneously limits the vertical movement of the protective shell (5) where the limiting groove (501) is located.

9. The housing assembly structure of a disposable injection pen according to claim 1, characterized in that: The limiting protrusion (111) has a lower end surface with an arcuate transition structure and an upper end surface with a horizontal truncation structure. At the same time, the outer wall of the protective shell (5) where the limiting groove (501) is located is provided with an arcuate transition structure, so that the protective shell (5) is implanted from the lower end portion where the lower shell member (1) is located to the inner wall and relatively fixed.

10. The housing assembly structure of a disposable injection pen according to claim 8, characterized in that: A transparent window (101) is provided on the outer wall of the lower housing (1), so that the outer wall of the syringe body (4) can be observed through the transparent window (101), and the limiting protrusion (111) is arranged on the opposite side of the transparent window (101).

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