Easy-to-assemble pen injector and assembly method therefor

Abstract

The present invention relates to the field of pen injectors, and in particular, to an easy-to-assemble pen injector and an assembly method therefor. The easy-to-assemble pen injector comprises a pen housing. Head and tail ends of the pen housing and the interior of the pen housing are provided with drug loading parts and a pushing part, respectively. The drug loading part is configured for mounting a cartridge, and the pushing part is configured for pushing the liquid out of the cartridge. The pen housing is circumferentially closed. Two ends of the pen housing are provided with openings for connecting the drug loading parts, and the openings form a channel for the pushing part to enter the interior of the pen housing. The pen housing and the pushing part are fixedly provided with a first electronic component and a second electronic component, respectively, and the first electronic component and the second electronic component synchronously achieve electrical contact when the pushing part is mounted to a desired position in the pen housing along an axis. The first electronic component comprises a charging port, and the second electronic component comprises a first circuit board and a spring needle fixed on the first circuit board and perpendicular to the axis. When the second electronic component moves to the desired position with the pushing part, the spring needle is snap-fitted to the charging port.

Description

Injection pen convenient to assemble and assembling method thereof TECHNICAL FIELD

[0001] The present application relates to the field of injection pen, in particular to an injection pen convenient to assemble and assembling method thereof. BACKGROUND

[0002] Electronic injection pen is an intelligent injection pen which uses precise stepping motor drive and electronic control principle to complete the drug injection process. Electronic injection pen is more accurate than mechanical injection pen, and has more diversified functional modules, and is generally a product that can be repeatedly used.

[0003] In the prior art, the pen shell of the injection pen is often formed by radially splicing a first pen shell and a second pen shell in a semicircular structure. This structure has at least two long splicing seams in the axial direction, which is not conducive to the sealing design of the injection pen. SUMMARY

[0004] The purpose of the present application is to provide an injection pen convenient to assemble and an assembling method thereof, so as to solve the problem that the pen shell of the injection pen splicing structure in the prior art is difficult to realize sealing and waterproof.

[0005] The technical scheme of the present application is: an injection pen convenient to assemble and an assembling method thereof, comprising a pen shell, the two ends and the inside of the pen shell are respectively provided with a medicine loading part and a pushing part; the medicine loading part is used for installing a card bottle, and the pushing part is used for pushing the liquid medicine in the card bottle out; characterized in that:

[0006] The pen shell is circumferentially closed, and the two ends are provided with openings for connecting the medicine loading part, and the openings form a channel for the pushing part to enter the inside of the pen shell;

[0007] The pen shell and the pushing part are respectively provided with a first electronic part and a second electronic part, and the first electronic part and the second electronic part are synchronously electrically contacted when the pushing part is assembled into the pen shell at the desired position along the axis;

[0008] The first electronic part comprises a charging port, the second electronic part comprises a first circuit board and a spring needle fixed vertically to the axis on the first circuit board, and the spring needle is clamped with the charging port when the second electronic part moves to the desired position with the pushing part.

[0009] Preferably, the pushing part comprises a push rod mechanism abutting against the card bottle, the push rod mechanism is provided with a push rod square sleeve, and the push rod square sleeve has at least one plane capable of carrying the second electronic part;

[0010] The inside of the pen shell has a cross section which does not interfere with the second electronic part before the pushing part is assembled into the desired position along the axial direction.

[0011] Preferably, one end of the push rod square sleeve is connected with a fixing frame, one end of the fixing frame has a first extension part towards the push rod square sleeve, a notch is formed in the center of the first extension part in the axial direction and is shaped according to the rectangular structure of the push rod square sleeve, the push rod square sleeve is embedded in the notch, so that the fixing frame can be connected with the push rod square sleeve at a preset angle; a first fixed connection hole and a pawl are further formed on the first extension part in the radial direction.

[0012] Preferably, a limiting wall is integrally formed on the inner wall of the pen shell in the radial direction, and the position of the pushing part when the end face of the fixing frame abuts against the limiting wall is set as the desired position.

[0013] Preferably, a second fixed connection hole is formed on the end of the fixing frame close to the limiting wall in the axial direction, a through hole is formed on the limiting wall corresponding to the second fixed connection hole, and a fastener is arranged to pass through the through hole from the end of the limiting wall away from the fixing frame and connect with the second fixed connection hole, thereby fixing one end of the pushing part with the pen shell.

[0014] Preferably, the charging part has a clamping sleeve for clamping the card bottle and a clamping seat connecting the clamping sleeve and the pen shell, the outer wall of the clamping seat abuts against the inner wall of the pen shell, one end of the clamping seat has an extension part towards the push rod square sleeve, a clamping seat connection hole is formed on the extension part in the radial direction, and another end of the battery is fixed through the cooperating fastener.

[0015] Preferably, the second electronic part further comprises a battery assembly, the battery assembly comprises a battery and a second circuit board connecting the battery, the two ends of the second circuit board are connected with the clamping seat and the fixing frame through the fasteners cooperating with the clamping seat connection hole and the first fixed connection hole, and the corresponding battery is clamped on the push rod square sleeve; one side of the battery close to the push rod square sleeve is attached to the push rod square sleeve, and the other side abuts against the second circuit board.

[0016] Preferably, the battery is arranged on both sides of the first circuit board, and the second circuit board is arranged on the battery and is clamped with the first circuit board through buckles.

[0017] An assembly method of an injection pen, comprising the following steps:

[0018] Step one, connecting the fixing frame to one end of the pushing part, and clamping the notch in the center of the first extension part of the fixing frame with the push rod square sleeve;

[0019] Step two, combining the clamping sleeve and the clamping seat, and connecting the clamping seat to the other end of the pushing part, so that the notch in the center of the second extension part of the clamping seat is clamped with the other end of the push rod square sleeve;

[0020] Step three, installing the first circuit board on the push rod square sleeve by clamping the pawl and the clamping seat connection hole;

[0021] Step four, the battery is attached to the push rod square sleeve opposite the two sides of the first circuit board, and the second circuit board is installed on the push part corresponding to the first fixed connection hole and the card seat connection hole, and the battery is pressed on the push rod square sleeve at the same time;

[0022] Step five, the assembled push part is installed into the pen shell, so that the fixed frame abuts against the limiting wall, and at the same time, the other end of the card seat also cooperates with the pen shell;

[0023] Step six, the angle of the push part is adjusted, so that the second fixed connection hole on the fixed frame corresponds to the through hole on the limiting wall, and at the same time, the spring needle also corresponds to the first electronic part on the pen shell; the push part and the pen shell are fixed by penetrating the through hole from the end of the limiting wall away from the fixed frame and connecting with the second fixed connection hole, and the assembly is completed.

[0024] Compared with the prior art, the advantages of the present application are:

[0025] (1) The pen shell of the present application is made by one-piece molding process, compared with the two-half splicing structure used in similar products, the pen shell of the present application is sealed along the circumference, only the openings are provided at both ends, so that it is not necessary to provide a sealing strip along the length direction, the sealing length is greatly reduced, and the sealing effect and waterproof performance are improved.

[0026] (2) The present application sets the card seat in the push rod mechanism outer sleeve as a fixed part for fixing one end of the push rod square sleeve, sets a fixed frame at the other end of the push rod square sleeve, and sets special structures on the card seat and the fixed frame, so that the second electronic part can be directly installed on the push part, thereby avoiding the inconvenience caused by the installation of the push part and the second electronic part in the closed pen shell. BRIEF DESCRIPTION OF DRAWINGS

[0027] The present application will be further described below in conjunction with the drawings and examples:

[0028] Fig. 1 is a cross-sectional view of the injection pen according to the present application;

[0029] Fig. 2 is a cross-sectional view of the push part according to the present application;

[0030] Fig. 3 is a cross-sectional view of the pen shell according to the present application;

[0031] Fig. 4 is a structure diagram of the charging part according to the present application;

[0032] Fig. 5 is an installation structure diagram of the push rod square sleeve and the second electronic part according to the present application;

[0033] Fig. 6 is a structure diagram of the fixed frame according to the present application;

[0034] Wherein: 1, pen shell, 11, limiting wall, 12, through hole, 2, charging part, 21, sleeve, 22, card seat, 221, second extension, 222, card seat connecting hole, 3, cartridge, 31, needle, 32, rubber plug, 4, push part, 41, push rod mechanism, 411, push rod, 412, push rod sleeve, 42, stepper motor, 43, push rod square sleeve, 44, fixing frame, 441, first extension, 442, first fixed connecting hole, 443, clamping jaw, 444, second fixed connecting hole, 5, control part, 6, first electronic part, 7, second electronic part, 71, first circuit board, 72, battery assembly, 721, battery, 722, second circuit board, 73, spring needle. DETAILED DESCRIPTION

[0035] The application will be further described in detail below with specific examples:

[0036] As shown in FIG. 1 and FIG. 2, an injection pen convenient to assemble includes a pen shell 1, the front end of the pen shell 1 is provided with a charging part 2, the charging part 2 is used for clamping a cartridge 3, one end of the bottle body of the cartridge 3 is connected with a needle 31, the other end is open, and a rubber plug 32 is matched at the opening, the drug liquid in the bottle body can be pushed out from the needle 31 by pushing the rubber plug 32. The inside of the middle end of the pen shell 1 is provided with a push part 4, the push part 4 includes a push rod mechanism 41, the push rod mechanism 41 has a push rod 411 coaxially arranged with the pen shell 1, a push rod sleeve 412 matched with the push rod 411, and a stepper motor 42. One end of the push rod 411 is fixed with the execution end of the stepper motor 42, and the outer wall is provided with external threads. The inner wall of the push rod sleeve 412 is provided with internal threads and is threadedly matched with the push rod 411, and the end of the push rod sleeve 412 away from the stepper motor 42 abuts against the rubber plug 32 in the cartridge 3. The stepper motor 42 drives the push rod 411 to rotate, so that the push rod sleeve 412 threadedly matched with the push rod 411 performs extension and contraction movement, thereby pushing the rubber plug 32 in the cartridge 3 to move towards the needle 31, and the drug liquid in the cartridge 3 is pushed out. The tail end of the pen shell 1 is provided with a control part 5, the control part 5 is connected with an encoder, when the control part 5 is rotated, the rotation angle information of the control part 5 read by the encoder will be transmitted to the stepper motor 42 through a flexible circuit board, so that the operator can adjust the drug pushing amount of the push rod 411 by rotating the control part 5.

[0037] For waterproof consideration, the pen shell 1 of the present application is made by integral molding process. Compared with the two-half splicing structure adopted by similar products, the pen shell 1 of the present application is sealed along the circumference, only the two ends are provided with openings, so that it is not necessary to arrange a sealing strip along the length direction, the sealing length is greatly reduced, and the sealing effect and waterproof performance are improved.

[0038] Correspondingly, the integrally formed pen shell 1 brings better sealing effect, while the narrow space inside the pen shell 1 will bring greater difficulty to the assembly and circuit connection of the push part 4 arranged inside the pen shell 1.

[0039] To this end, the present application will adopt the following arrangement to realize the assembly of the push part 4 outside the pen shell 1, and push the assembled push part 4 into the pen shell 1 as a whole, and at the same time complete the communication between the first electronic part 6 on the pen shell 1 and the second electronic part 7 on the push part 4. In the present embodiment, the first electronic part 6 is arranged as a charging port on the pen shell 1.

[0040] Specifically, as shown in FIGS. 2 and 5, the push part 4 further comprises a push rod square sleeve 43, which is sleeved outside the push rod mechanism 41 and is arranged in a rectangular structure with four side walls for connecting and installing the second electronic part 7.

[0041] As shown in FIGS. 2 and 6, one end of the push rod square sleeve 43 is connected with a fixing frame 44, one end of the fixing frame 44 has a first extension 441 towards the push rod square sleeve 43, a slot is formed in the center of the first extension 441 along the axial direction and is arranged in a shape corresponding to the rectangular structure of the push rod square sleeve 43, the push rod square sleeve 43 is embedded in the slot, so that the fixing frame 44 can be connected with the push rod square sleeve 43 at a preset angle of rotation. The first extension 441 is further provided with a first fixing connection hole 442 and a clamping jaw 443 along the radial direction.

[0042] The other end of the push rod square sleeve 43 is connected with the pen shell 1 through the charging part 2. Specifically, as shown in FIG. 4, the charging part 2 comprises a clamping sleeve 21 and a clamping seat 22. The clamping sleeve 21 is used to connect the cartridge 3, and the clamping seat 22 is fixed at one end of the clamping sleeve 21 away from the cartridge 3. One end face of the clamping seat 22 is provided with a second extension 221 towards the push rod square sleeve 43, a slot is formed in the center of the second extension 221 along the axial direction and is arranged in a shape corresponding to the rectangular structure of the push rod square sleeve 43, the push rod square sleeve 43 is embedded in the slot, so that the fixing frame 44 can be connected with the push rod square sleeve 43 at a preset angle of rotation. Moreover, the second extension 221 is provided with a clamping seat connection hole 222 along the radial direction.

[0043] As shown in Fig. 5, the second electronic component 7 comprises a first circuit board 71 and a battery assembly 72, wherein the first circuit board 71 is arranged on one side wall of the push rod square sleeve 43, fixed to the clamping seat connection hole 222 of the cartridge 2 by fasteners at one end, and clamped in the clamping jaw 443 of the fixing frame 44 at the other end. One side of the first circuit board 71 is also provided with a clamping buckle for clamping the battery assembly 72. The battery assembly 72 is arranged in pairs and fixed to the two adjacent wall surfaces of the side wall on which the first circuit board 71 is arranged. The battery assembly 72 comprises a battery 721 and a second circuit board 722 connected to the battery 721. The two ends of the second circuit board 722 are connected to the clamping seat 22 and the fixing frame 44 by fasteners fitted into the clamping seat connection hole 222 and the first fixing connection hole 442, respectively, and the corresponding battery 721 is clamped on the push rod square sleeve 43. The battery 721 is attached to the push rod square sleeve 43 by the adhesive on one side, and abuts against the second circuit board 722 on the other side.

[0044] Through the above arrangement, the second electronic component 7 and the pusher 4 can be fixed and installed outside the pen barrel 1. The inner wall of the pen barrel 1 has a cross section that does not interfere with the second electronic component 7 before the pusher 4 enters the desired position in the axial direction, thereby ensuring that the pusher 4 and the second electronic component 7 can be integrally installed in the pen barrel 1.

[0045] As shown in Fig. 3, the inner wall of the pen barrel 1 is integrally formed with a limiting wall 11 in the radial direction, and the desired position is set as the position of the pusher 4 in the pen barrel 1 when the fixing frame 44 abuts against the limiting wall 11.

[0046] In order to fix the pusher 4 together with the second electronic component 7 to the pen barrel 1 after assembly, as shown in Figs. 3 and 6, a second fixing connection hole 444 is formed in the fixing frame 44 in the axial direction at the end close to the limiting wall 11, and a through hole 12 is formed in the limiting wall 11 corresponding to the second fixing connection hole 444, and a fastener is arranged to pass through the through hole 12 from the end of the limiting wall 11 away from the fixing frame 44 and connect with the second fixing connection hole 444, thereby fixing one end of the pusher 4 to the pen barrel 1. The fixation of the other end of the pusher 4 is realized by the clamping seat 22, which is in interference fit with the inner wall of the pen barrel 1, thereby fixing the other end of the pusher 4 to the pen barrel 1.

[0047] Regarding the connection of the second electronic component 7 and the first electronic component 6 on the pen barrel 1, the following structure design is adopted:

[0048] As shown in Fig. 5, a pogo pin 73 (pogo pin connector) is arranged on the first circuit board 71 in the vertical direction. When the second electronic component 7 is installed in the desired position in the pen barrel 1 along with the push rod square sleeve 43, the pogo pin 73 is electrically connected to the charging port of the first electronic component 6 on the pen barrel 1.

[0049] The assembling process of the present application comprises the following steps:

[0050] Step one, connect the fixed frame 44 to one end of the pushing part 4, and make the notch at the center of the first extension 441 of the fixed frame 44 correspondingly connect with the square sleeve 43 of the pushing rod.

[0051] Step two, combine the sleeve 21 with the seat 22, and connect the other end of the pushing part 4 with the seat 22, so that the notch at the center of the second extension 221 of the seat 22 correspondingly connect with the other end of the square sleeve 43 of the pushing rod.

[0052] Step three, install the first circuit board 71 to the square sleeve 43 of the pushing rod according to the corresponding claw 443 and the connecting hole 222 of the seat.

[0053] Step four, attach the battery 721 to the square sleeve 43 on the opposite side of the first circuit board 71 by using the back adhesive, and install the second circuit board 722 on the pushing part 4 according to the first fixed connecting hole 442 and the connecting hole 222 of the seat, and simultaneously press the battery 721 tightly on the square sleeve 43 of the pushing rod. Complete the assembly of the second electronic component 7 and the pushing part 4.

[0054] Step five, put the assembled pushing part 4 into the pen shell 1, so that the fixed frame 44 abuts against the limiting wall 11, and at the same time, the seat 22 at the other end also cooperates with the pen shell 1.

[0055] Step six, adjust the angle of the pushing part 4, so that the second fixed connecting hole 444 on the fixed frame 44 corresponds to the through hole 12 on the limiting wall 11, and at the same time, the spring needle 73 also correspondingly contacts the first electronic component 6 on the pen shell 1. Use the fastener to pass through the through hole 12 from the end of the limiting wall 11 away from the fixed frame 44 and connect with the second fixed connecting hole 444, so as to fix the pushing part 4 with the pen shell 1, and complete the assembly.

[0056] The above embodiments are only for illustrating the technical concept and characteristics of the present application, and the purpose is to enable those skilled in the art to understand the content of the present application and implement it, and cannot limit the protection scope of the present application. For those skilled in the art, it is obvious that the present application is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present application, therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-limiting, the scope of the present application is defined by the appended claims rather than the above description, therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application.

Claims

1. A pen for injection, comprising a pen shell (1), the pen shell (1) having a loading part (2) and a pushing part (4) at the two ends and inside, respectively; the loading part (2) is used for installing a cartridge (3), and the pushing part (4) is used for pushing the liquid medicine in the cartridge (3) out; characterized in that: the pen shell (1) is circumferentially closed, and the two ends are provided with openings for connecting the loading part (2), and the openings form a channel for the pushing part (4) to enter the inside of the pen shell (1); the pen shell (1) and the pushing part (4) are respectively provided with a first electronic component (6) and a second electronic component (7), and the first electronic component (6) and the second electronic component (7) are synchronously electrically contacted when the pushing part (4) is assembled into the pen shell (1) at a desired position along an axis; the first electronic component (6) comprises a charging port, the second electronic component (7) comprises a first circuit board (71) and a spring needle (73) fixed perpendicularly to the axis on the first circuit board (71), and when the second electronic component (7) moves to the desired position with the pushing part (4), the spring needle (73) is clamped with the charging port.

2. An injection pen for easy assembly according to claim 1, characterized in that the pushing part (4) comprises a push rod mechanism (41) abutting against the cartridge (3), the push rod mechanism (41) is provided with a push rod square sleeve (43), and the push rod square sleeve (43) has at least one plane capable of carrying the second electronic component (7); the inside of the pen shell (1) has a cross section not interfering with the second electronic component (7) before the pushing part (4) is assembled into the desired position along the axis.

3. An injection pen for easy assembly according to claim 2, characterized in that one end of the push rod square sleeve (43) is connected with a fixing frame (44), one end of the fixing frame (44) has a first extension (441) towards the push rod square sleeve (43), a notch is formed in the center of the first extension (441) along the axis and is shaped according to the rectangular structure of the push rod square sleeve (43), the push rod square sleeve (43) is embedded in the notch, so that the fixing frame (44) can be connected with the push rod square sleeve (43) at a preset rotation angle; the first extension (441) is further provided with a first fixed connection hole (442) and a clamping jaw (443) along the radial direction.

4. An injection pen for easy assembly according to claim 3, characterized in that a limiting wall (11) is integrally formed on the inner wall of the pen shell (1) along the radial direction, and the position of the pushing part (4) when the end face of the fixing frame (44) abuts against the limiting wall (11) is set as the desired position.

5. An injection pen for easy assembly according to claim 4, characterized in that a second fixed connection hole (444) is formed in the end of the fixing frame (44) close to the limiting wall (11) along the axis, a through hole (12) is formed in the limiting wall (11) corresponding to the second fixed connection hole (444), and a fastener is arranged to pass through the through hole (12) from the end of the limiting wall (11) away from the fixing frame (44) and connect with the second fixed connection hole (444), thereby fixing one end of the pushing part (4) with the pen shell (1).

6. An injection pen for easy assembly according to claim 5, characterized in that The charging part (2) has a clamping sleeve (21) for clamping the card bottle (3), and a clamping seat (22) connecting the clamping sleeve (21) and the pen shell (1), the outer wall of the clamping seat (22) abuts with the inner wall of the pen shell (1), one end has an extension towards the push rod square sleeve (43), and a clamping seat connecting hole (222) is radially arranged, and the other end of the battery (721) is fixed by the fastener arranged in cooperation.

7. An injection pen for easy assembly according to claim 6, characterized in that The second electronic part (7) further comprises a battery assembly (72), the battery assembly (72) comprises a battery (721) and a second circuit board (722) connected with the battery (721), the two ends of the second circuit board (722) are connected with the clamping seat (22) and the fixing frame (44) through the fastener cooperating with the clamping seat connecting hole (222) and the first fixed connecting hole (442), and the corresponding battery (721) is clamped on the push rod square sleeve (43); one side of the battery (721) close to the push rod square sleeve (43) is attached to the push rod square sleeve (43), and the other side abuts against the second circuit board (722).

8. An injection pen for easy assembly according to claim 7, characterized in that The battery (721) is arranged on both sides of the first circuit board (71), the second circuit board (722) covers the battery (721) and is arranged with buckles to clamp the first circuit board (71).

9. A method of assembling an injection pen for ease of assembly as claimed in claim 8, wherein, The method comprises the following steps: Step one, connect the fixing frame (44) to one end of the pushing part (4), and make the notch at the center position of the first extension (441) on the fixing frame (44) correspondingly clamp the push rod square sleeve (43); Step two, combine the clamping sleeve (21) and the clamping seat (22), and connect the clamping seat (22) to the other end of the pushing part (4), so that the notch at the center position of the second extension (221) on the clamping seat (22) correspondingly clamps the other end of the push rod square sleeve (43); Step three, install the first circuit board (71) on the push rod square sleeve (43) corresponding to the clamping jaw (443) and the clamping seat connecting hole (222); Step four, attach the battery (721) to the two sides of the push rod square sleeve (43) opposite to the first circuit board (71), install the second circuit board (722) on the pushing part (4) corresponding to the first fixed connecting hole (442) and the clamping seat connecting hole (222), and simultaneously press the battery (721) tightly on the push rod square sleeve (43); Step five, put the assembled pushing part (4) into the pen shell (1), so that the fixing frame (44) abuts against the limiting wall (11), and the clamping seat (22) at the other end also cooperates with the pen shell (1); Step six, adjust the angle of the pushing part (4), so that the second fixed connecting hole (444) on the fixing frame (44) corresponds to the through hole (12) on the limiting wall (11), and the spring needle (73) also corresponds to the first electronic part (6) on the pen shell (1); after the fastener is penetrated through the through hole (12) from the end of the limiting wall (11) away from the fixing frame (44) and connected with the second fixed connecting hole (444), the pushing part (4) and the pen shell (1) are fixed, and the assembly is completed.

Images