Drug injection device

Abstract

The utility model relates to the technical field of medical instruments, and particularly discloses a medicine injection device which comprises a scale drum, a knob and an end cover. At least one clamping hole and at least one limiting groove extending from the first end to the second end are formed in the peripheral wall of the first end of the scale drum; the inner circumferential wall of the rotary knob is provided with at least one convex block and at least one limiting insertion strip, the convex block is matched with the clamping hole, the limiting insertion strip is matched with the limiting groove, so that the rotary knob is clamped to the first end of the scale rotary drum, the inner circumferential wall of the rotary knob is further provided with a spacer, and an insertion hole is formed in the spacer; the end cover is provided with a clamping pin extending from the first end to the second end, and the clamping pin is matched with the insertion hole so that the end cover can be connected with the rotary knob in a clamping mode. According to the utility model, the scale drum, the knob and the end cover are designed into a split structure, so that the design precision of the die can be improved, the assembly process is simplified, and meanwhile, the structural stability after assembly is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to medical instrument technical field, in particular to a medicine injection device. BACKGROUND

[0002] At present, medicine injection device is often used to give patient long-term quantitative administration, at present, the people using medicine injection device include but are not limited to diabetic patients, growth hormone deficiency and obesity weight loss patients. Medicine injection device usually includes dose adjusting component, transmission component, injection component and force component. Dose adjusting component includes scale drum and knob, and force component includes end cover.

[0003] In prior art, scale drum, knob and end cover are connected together by gluing, and three rotate together when dose is adjusted. However, gluing connection can cause complex assembly process, poor structural stability, reduce production efficiency of product and increase product cost. UTILITY MODEL CONTENT

[0004] The utility model solves the technical problem in prior art that assembly process is complex and structural stability is poor.

[0005] In order to solve the above technical problem, the utility model provides a medicine injection device with oppositely arranged first end and second end, comprising:

[0006] Scale drum, the first end of the scale drum is provided with at least one clamping hole and at least one limiting slot extending from the first end to the second end;

[0007] Knob, the inner circumferential wall of the knob is provided with at least one protruding block and at least one limiting insertion strip, the protruding block is matched with the clamping hole, and the limiting insertion strip is matched with the limiting slot, so that the knob is clamped to the first end of the scale drum, the inner circumferential wall of the knob is further provided with a baffle, and the baffle is provided with an insertion hole;

[0008] End cover, the end cover is provided with a clamping leg extending from the first end to the second end, the clamping leg is matched with the insertion hole, so that the end cover is clamped and connected with the knob.

[0009] Further preferably, the width of the limiting slot gradually narrows from the first end to the second end.

[0010] Further preferably, the outer circumferential wall of the end cover is provided with a groove along the axial direction, one end of the clamping leg is arranged in the groove, the other end of the clamping leg is provided with oppositely arranged second clamping claws, and the second clamping claws extend along the radial direction.

[0011] Further preferably, the clamping leg is further provided with an axial gap between the second clamping claws.

[0012] Further preferably, the protrusion and the limiting insert are arranged on the spacer plate on the side close to the scale drum.

[0013] Further preferably, the inner wall of the knob is further provided with at least one positioning protrusion on the side of the spacer plate away from the scale drum, and the outer wall of the end cover is further provided with at least one positioning groove matched with the at least one positioning protrusion.

[0014] Further preferably, the utility model also comprises a rotating tube, and the first end of the rotating tube is provided with at least one first clamping claw, and the first clamping claw is formed with a radial hook.

[0015] Further preferably, the middle part of the spacer plate is provided with a first through hole, and the side of the spacer plate away from the scale drum is formed with at least one protrusion, and the first clamping claw passes through the first through hole and is hooked with the protrusion.

[0016] Further preferably, the utility model also comprises a tail handle connecting tube and a button, the tail handle connecting tube is arranged in the rotating tube, the first end of the tail handle connecting tube is formed with a narrow mouth part, the end cover is provided with a second through hole penetrating in the axial direction, and the narrow mouth part is sequentially arranged in the first through hole and the second through hole from the second end to the first end, and the button is connected with the narrow mouth part.

[0017] Further preferably, the outer wall of the tail handle connecting tube extends in the axial direction to the first end and forms a receiving groove with the outer wall of the narrow mouth part, and the receiving groove is provided with an elastic member abutting against the button.

[0018] Compared with the prior art, the drug injection device has the beneficial effects that:

[0019] The utility model discloses a knob is provided with the protruding block and the clamping hole, and the knob and the scale rotating drum are assembled together, and the protruding block can be clamped into the clamping hole, thereby realizing the clamping of the knob and the scale rotating drum, in addition, the knob is provided with the limiting slot and the limiting insertion strip, and the knob and the scale rotating drum are assembled together, and the limiting insertion strip can be inserted into the limiting slot, thereby when the knob drives the scale rotating drum to rotate, the cooperation of the limiting insertion strip and the limiting slot can avoid the relative rotation between the scale rotating drum and the knob, thereby effectively avoiding the protruding block from the clamping hole, further, the knob is provided with the partition sheet, and the partition sheet is provided with the insertion hole, and the clamping leg of the end cover can be inserted into the insertion hole and locked, thereby realizing the clamping between the end cover and the knob, the utility model discloses the scale rotating drum, the knob and the end cover are designed into the split type structure, not only are favorable to the design of the mould, improve the design precision of the mould, but also can simplify the assembly process, ensure the structural stability after assembly, thereby improving the production efficiency of the device and reducing the production cost. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is the explosion schematic view of a kind of medicine injection device described in the utility model.

[0021] Figure 2 It is the structure schematic view of scale rotating drum described in the utility model.

[0022] Figure 3 It is the structure schematic view of knob described in the utility model.

[0023] Figure 4 It is the structure schematic view of knob another view described in the utility model.

[0024] Figure 5 It is the structure schematic view of end cover described in the utility model.

[0025] Figure 6 It is the structure schematic view of end cover another view described in the utility model.

[0026] Figure 7 It is the structure schematic view of screw pipe described in the utility model.

[0027] Figure 8 It is the assembly drawing of scale rotating drum, knob and screw pipe described in the utility model.

[0028] Figure 9 It is partial cutaway view of a kind of medicine injection device described in the utility model.

[0029] Reference Signs:

[0030] 100, scale rotating drum;110, clamping hole;120, limiting slot;

[0031] 200, knob; 210, protrusion; 220, limiting insert; 230, spacer; 240, first through hole; 250, socket; 260, boss; 270, positioning protrusion;

[0032] 300, rotary tube; 310, first clamping jaw; 320, hook portion;

[0033] 400, end cover; 410, groove; 420, clamping leg; 430, second clamping jaw; 440, gap; 450, positioning groove; 460, second through hole;

[0034] 500, handle barrel; 510, narrow mouth portion; 520, receiving groove;

[0035] 600, elastic member;

[0036] 700, button; 710, connecting column. DETAILED DESCRIPTION

[0037] The specific embodiments of the present application will be further described in conjunction with the drawings and examples. The following examples are used to illustrate the present application, but are not used to limit the scope of the present application.

[0038] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like in the present application are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0039] The terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0040] Furthermore, unless otherwise expressly specified and limited, the terms "install," "connect," and "couple" are to be construed broadly and can be either direct or indirect, as appropriate, and can include fixed connections, detachable connections, or integral connections, as appropriate, and can include mechanical connections, electrical connections, or both, as appropriate, and can include direct connections between elements or indirect connections between elements through other elements, as appropriate.

[0041] In the present application, unless otherwise expressly specified and limited, a first feature is "on" or "under" a second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature is "over", "above", and "on top of" the second feature can be that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in horizontal height than the second feature. The first feature is "under", "below", and "underneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in horizontal height than the second feature.

[0042] It should be noted that when an element is referred to as being "fixed" or "set" on another element, it can be directly on the other element or there can be an intermediate element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or there can be an intermediate element. The terms "vertical", "horizontal", "up", "down", "left", "right", and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation.

[0043] The present embodiment provides a medicine injection device, which has a first end and a second end arranged oppositely, it is to be noted that the first end refers to a pressure applying end, and the second end refers to an injection end for contacting a human body.

[0044] As shown in Figures 1-9 The medicine injection device comprises a scale drum 100, a knob 200, and an end cover 400, wherein a peripheral wall of a first end of the scale drum 100 is provided with at least one clamping hole 110 and at least one limiting slot 120 extending from the first end to a second end; an inner peripheral wall of the knob 200 is provided with at least one protrusion 210 and at least one limiting insertion strip 220, the protrusion 210 is matched with the clamping hole 110, and the limiting insertion strip 220 is matched with the limiting slot 120, so that the knob 200 is clamped at the first end of the scale drum 100, and thus, when the scale drum 100 and the knob 200 are assembled together, the protrusion 210 can be clamped into the clamping hole 110, thereby realizing clamping of the scale drum 100 and the knob 200.

[0045] In addition, when the scale drum 100 and the knob 200 are assembled together, the limiting insert strip 220 can be matched and inserted into the limiting slot 120, so that when the knob 200 drives the scale drum 100 to rotate, the matching of the limiting insert strip 220 and the limiting slot 120 can avoid the relative rotation between the scale drum 100 and the knob 200, thereby effectively avoiding the protrusion 210 from being pulled out of the clamping hole 110; that is, the protrusion 210 and the limiting insert strip 220 can limit the movement pair and the rotation pair of the scale drum 100 and the knob 200.

[0046] In some embodiments, the first end and the second end of the scale drum 100 are both open cylindrical structures, and the knob 200 is a ring-shaped cylindrical structure, which is sleeved on the outer periphery of the first end of the scale drum 100.

[0047] In some embodiments, the inner peripheral wall of the knob 200 is further provided with a partition plate 230, and the partition plate 230 is provided with an insertion hole 250; the end cover 400 is provided with a clamping leg 420 extending from the first end to the second end, and the clamping leg 420 is matched with the insertion hole 250, so that the clamping leg 420 of the end cover 400 can be inserted and locked with the insertion hole 250, thereby realizing the clamping between the end cover 400 and the knob 200.

[0048] In some embodiments, the number of insertion holes 250 is at least one, such as one, two, three or more, and the number of clamping legs 420 corresponds to the number of insertion holes 250. During installation, one clamping leg 420 corresponds to one insertion hole 250, and the setting of multiple clamping legs 420 and insertion holes 250 can make the clamping between the end cover 400 and the knob 200 more firm.

[0049] In some embodiments, the protrusion 210 and the limiting insert strip 220 are both arranged on the side of the partition plate 230 close to the scale drum 100, so that the protrusion 210 and the limiting insert strip 220 can be matched with the clamping hole 110 and the limiting slot 120, respectively.

[0050] In other embodiments, the partition plate 230 and the knob 200 are an integral structure, such as an integral injection molding structure or an integral die casting structure. Injection molding and die casting are existing process technologies, which will not be described in detail.

[0051] In the present embodiment, the scale drum 100, the knob 200 and the end cover 400 are designed as a split structure, which is not only beneficial to the design of the mold and improves the design precision of the mold, but also simplifies the assembly process and ensures the structural stability after assembly, thereby improving the production efficiency of the device and reducing the production cost.

[0052] In some embodiments, the width of the limiting groove 120 gradually narrows from the first end to the second end, and the width of the limiting plug 220 also gradually narrows from the first end to the second end, so that the limiting groove 120 has a certain guiding effect when the scale drum 100 and the knob 200 are assembled, which can improve the assembly precision of the limiting plug 220 and the limiting groove 120 and improve the assembly efficiency.

[0053] In some embodiments, the end cover 400 is embedded on the side of the knob 200 away from the scale drum 100, and the end cover 400 is connected with the knob 200 by clamping. In order to facilitate the design of the mold and improve the design precision of the mold, the outer peripheral wall of the end cover 400 is provided with a groove 410 along the axial direction, and one end of the clamping leg 420 is arranged in the groove 410. In this way, the outer wall of the clamping leg 420 and the outer wall of the end cover 400 are arranged on the same circumference by arranging the groove 410, so as to facilitate the design of the mold and avoid increasing the mold design difficulty of the knob 200 due to the partial protrusion of the clamping leg 420. In addition, the other end of the clamping leg 420 is provided with a second clamping claw 430 arranged oppositely, and the second clamping claw 430 extends along the radial direction. When the end cover 400 is embedded on the knob 200, the clamping leg 420 can be inserted into the insertion hole 250 to realize the clamping connection between the end cover 400 and the knob 200.

[0054] In some embodiments, the clamping leg 420 is also provided with a gap 440 extending along the axial direction, and the gap 440 is arranged between the oppositely arranged second clamping claws 430. In this way, when the end cover 400 is clamped with the knob 200, the clamping leg 420 moves along the axial direction of the scale drum 100 from the first end to the second end and is clamped into the insertion hole 250. Since the clamping leg 420 includes two oppositely arranged second clamping claws 430, and the second clamping claws 430 extend along the radial direction to form an "L" shaped claw structure, and the two second clamping claws 430 are also provided with a gap 440, therefore, in the natural state, there is a gap 440 between the two second clamping claws 430, and the overall structure of the clamping leg 420 is larger than the size of the insertion hole 250. When the clamping leg 420 is inserted into the insertion hole 250, the second clamping claw 430 will be elastically deformed under pressure, at this time, the two second clamping claws 430 are close to each other under the action of external force, so that the gap 440 gradually decreases to facilitate the clamping leg 420 to extend into the insertion hole 250. When the second clamping claw 430 extends into the insertion hole 250, the second clamping claw 430 restores the elastic deformation, and since the second clamping claw 430 extends along the radial direction to form an "L" shaped claw structure, therefore, the second clamping claw 430 is similar to a hook which hooks the edge of the insertion hole 250, which can prevent the second clamping claw 430 from being pulled out of the insertion hole 250, thereby ensuring that the clamping between the end cover 400 and the knob 200 is more firm.

[0055] In some embodiments, to further improve the assembly positioning effect of the end cover 400 and the knob 200, the inner peripheral wall of the knob 200 is further provided with at least one positioning protrusion 270, the positioning protrusion 270 is arranged on the side of the partition plate 230 away from the scale drum 100, the outer peripheral wall of the end cover 400 is further provided with at least one positioning groove 450, and the at least one positioning groove 450 is matched with the at least one positioning protrusion 270; in this way, the outer peripheral wall of the end cover 400 is provided with the positioning groove 450 matched with the positioning protrusion 270, and when the assembly is matched, the positioning protrusion 270 and the positioning groove 450 play a role in assembly positioning, and further limit the relative rotation of the end cover 400 and the knob 200.

[0056] In some embodiments, the drug injection device further comprises a rotating tube 300, the first end of the rotating tube 300 is clamped with the knob 200, and when the dose is adjusted, the scale drum 100, the knob 200, the rotating tube 300 and the end cover 400 rotate together.

[0057] Specifically, the rotating tube 300 is arranged on the inner side of the scale drum 100, and the scale drum 100 and the rotating tube 300 are coaxially arranged.

[0058] In some embodiments, the first end of the rotating tube 300 is provided with at least one first clamping jaw 310, the first clamping jaw 310 is formed with a hook portion 320 extending in the radial direction, the middle part of the partition plate 230 is provided with a first through hole 240, and the side of the partition plate 230 away from the scale drum 100 is formed with at least one boss 260, the boss 260 is arranged on the edge of the first through hole 240, and the first clamping jaw 310 passes through the first through hole 240 and is hooked with the boss 260. In this way, the upper end of the rotating tube 300 is provided with the hook portion 320, the partition plate 230 of the knob 200 is provided with the first through hole 240, the first clamping jaw 310 is inserted into the first through hole 240 from the second end to the first end, and then the hook portion 320 is clamped with the boss 260 on the edge of the first through hole 240, so that the clamping between the rotating tube 300 and the knob 200 is more firm.

[0059] In some embodiments, the knob 200 and the rotating tube 300 are designed in a split body, which facilitates the design of the mold and improves the design accuracy of the mold.

[0060] In some embodiments, the drug injection device further comprises a tail handle cylinder 500 and a button 700, the tail handle cylinder 500 is arranged in the rotating tube 300, the first end of the tail handle cylinder 500 is formed with a narrow mouth portion 510, the end cover 400 is provided with a second through hole 460 penetrating in the axial direction, the narrow mouth portion 510 is sequentially arranged in the first through hole 240 and the second through hole 460 from the second end to the first end, and the button 700 is connected with the narrow mouth portion 510.

[0061] In some embodiments, the button 700 is provided with a connecting column 710 towards one side of the handle barrel 500, the connecting column 710 extends into the narrow mouth part 510 of the handle barrel 700 and realizes snap-fit connection.

[0062] In some embodiments, the outer peripheral wall of the handle barrel 500 extends along the axial direction towards the first end and forms a U-shaped receiving groove 520 with the outer wall of the narrow mouth part 510, the elastic member 600 is arranged in the receiving groove 520, the elastic member 600 is sleeved on the narrow mouth part 510, and the elastic member 600 abuts against the button 700; when the button 700 is pressed, the elastic member 600 is in a compressed state, and when the pressing force is removed, the button 700 is reset to the initial state.

[0063] In summary, the utility model discloses an injection device, which is provided with a clamping hole 110 on the peripheral wall of the scale drum 100, a protrusion 210 on the inner peripheral wall of the knob 200, and a limiting slot 120 on the peripheral wall of the scale drum 100, and a limiting insertion strip 220 on the inner peripheral wall of the knob 200. When the scale drum 100 and the knob 200 are assembled together, the protrusion 210 can be clamped into the clamping hole 110, the limiting insertion strip 220 can be inserted into the limiting slot 120, and the limiting insertion strip 220 and the limiting slot 120 can prevent the scale drum 100 and the knob 200 from rotating relative to each other when the knob 200 drives the scale drum 100 to rotate, thereby preventing the protrusion 210 from being pulled out of the clamping hole 110. In addition, the inner peripheral wall of the knob 200 is provided with a partition 230, and the partition 230 is provided with an insertion hole 250, so that the clamping leg 420 of the end cover 400 can be inserted into the insertion hole 250 to lock, thereby realizing the clamping connection between the end cover 400 and the knob 200. The scale drum 100, the knob 200 and the end cover 400 are designed as a split structure, which is not only beneficial to the design of the mold and improves the design precision of the mold, but also simplifies the assembly process and ensures the stability of the assembled structure, thereby improving the production efficiency of the device and reducing the production cost.

[0064] The above merely describes preferred embodiments of the present application, and it should be noted that, for those skilled in the art, some improvements and replacements can be made without departing from the technical principles of the present application, and these improvements and replacements should also be considered as the protection scope of the present application. The basic principles, main features and advantages of the present application are shown and described above, and it is obvious for those skilled in the art that the present application is not limited to the details of the above preferred embodiments, and the embodiments should be considered as exemplary and non-limiting, and the scope of the present application is defined by the appended claims rather than the above description, and therefore all changes falling within the meaning and scope of the equivalent elements of the claims should be included in the present application.

[0065] In addition, it should be understood that, although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description manner of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in the embodiments can also be properly combined to form other embodiments that those skilled in the art can understand.

Claims

1. A drug injection device having first and second oppositely disposed ends, characterised in that, The utility model relates to a scale drum, a knob and an end cover, and belongs to the technical field of scale drums. The scale drum comprises a scale drum body, a first end of the scale drum body is provided with at least one clamping hole and at least one limiting slot extending from the first end to a second end; The knob comprises an inner circumferential wall, the inner circumferential wall is provided with at least one protruding block matched with the clamping hole and at least one limiting insertion strip matched with the limiting slot, so that the knob is clamped to the first end of the scale drum, and the inner circumferential wall of the knob is further provided with a partition plate, and the partition plate is provided with an insertion hole; The end cover is provided with a clamping leg extending from the first end to the second end, and the clamping leg is matched with the insertion hole, so that the end cover is clamped and connected with the knob.

2. A drug injection device according to claim 1, wherein, The width of the limiting slot gradually narrows from the first end to the second end.

3. The drug injection device of claim 1, wherein The outer circumferential wall of the end cover is provided with a groove in the axial direction, one end of the clamping leg is arranged in the groove, and the other end of the clamping leg is provided with oppositely arranged second clamping claws extending in the radial direction.

4. A drug injection device according to claim 3, wherein, The clamping leg is further provided with a gap extending in the axial direction, and the gap is arranged between the oppositely arranged second clamping claws.

5. The drug injection device of claim 1, wherein, The protruding block and the limiting insertion strip are arranged on the side of the partition plate close to the scale drum.

6. The drug injection device of claim 1, wherein, The inner circumferential wall of the knob is further provided with at least one positioning protrusion arranged on the side of the partition plate away from the scale drum, and the outer circumferential wall of the end cover is further provided with at least one positioning slot matched with the at least one positioning protrusion.

7. The drug injection device of claim 1, wherein, The utility model further comprises a rotating pipe, the first end of the rotating pipe is provided with at least one first clamping claw formed with a hook portion extending in the radial direction.

8. A drug injection device according to claim 7, wherein, The middle part of the partition plate is provided with a first through hole, and the side of the partition plate away from the scale drum is formed with at least one protruding block, and the first clamping claw passes through the first through hole and is hooked with the protruding block.

9. A drug injection device according to claim 8, wherein, The utility model further comprises a tail handle connecting cylinder and a button, the tail handle connecting cylinder is arranged in the rotating pipe, the first end of the tail handle connecting cylinder is formed with a narrow mouth portion, the end cover is provided with a second through hole penetrating in the axial direction, and the narrow mouth portion is sequentially arranged in the first through hole and the second through hole from the second end to the first end, and the button is buckled and connected with the narrow mouth portion.

10. A drug injection device according to claim 9, wherein, The outer circumferential wall of the tail handle connecting cylinder extends in the axial direction to the first end and forms a receiving groove with the outer wall of the narrow mouth portion, and the receiving groove is provided with an elastic member abutting against the button.

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