An easy-to-assemble injection pen and its assembly process

Abstract

The present invention comprises a pen casing (1), said pen casing (1) being provided at its ends and internally with a loading portion (2) and a thrust portion (4); said pen casing (1) is circularly closed, its two ends having openings for connecting the loading portion (2); said pen casing (1) and said thrust portion (4) are respectively equipped with a primary electronic component (6) and a secondary electronic component (7); said primary electronic component (6) comprises a charging port, said secondary electronic component (7) comprises a primary printed circuit board (71) and a spring-loaded needle (73) fixed perpendicularly to the axis on the primary printed circuit board (71). (Figure for abbreviation: Fig. 1)

Description

Title of the invention: An easy-to-assemble injection pen and its assembly method. Technical field of the invention

[0001] The present invention relates to the field of injector pens, and more particularly to an easy-to-assemble injector pen and its assembly method. Previous technique

[0002] The electronic injection pen is an intelligent injection pen that uses a precision stepper motor combined with electronic control principles to perform the drug injection process. Electronic injection pens are distinguished from mechanical models by their increased precision, extensive functional modularity, and generally reusable design.

[0003] In existing technologies, the pen injector housing is generally made up of two semi-circular half-housings (primary half-housing and secondary half-housing) assembled radially, which creates at least two long axial assembly joints unfavorable to the sealing of the pen injector. Description of the invention

[0004] The objective of the present invention is to: propose an easy-to-assemble injector pen and its assembly method, in order to solve the problem of faulty sealing inherent in the jointed housing structures of injector pens in existing technologies.

[0005] The technical solution of the present invention relates to: an easy-to-assemble injector pen and its assembly method, comprising a pen casing, said pen casing being provided at its ends and inside with a loading portion and a thrust portion; said loading portion is intended to receive a cartridge, said thrust portion serves to expel the medicinal liquid contained in the cartridge; characterized in that:

[0006] The pen case is closed in a circular fashion, its two ends having openings allowing the connection of the loading part, and said openings also form a passage through which the pushing part can enter the inside of the pen case;

[0007] Said pen housing and said pusher part are respectively equipped with a primary electronic component and a secondary electronic component, said primary electronic component and secondary electronic component establish simultaneously an electrical contact when the thrust part is inserted axially into the pen housing to a target position;

[0008] Said primary electronic component includes a charging port, said secondary electronic component includes a primary printed circuit board and a spring-loaded needle fixed perpendicularly to the axis on the primary printed circuit board, when said secondary electronic component moves with the thrust portion to the target position, said spring-loaded needle mechanically hooks onto the charging port.

[0009] Preferably, said push part comprises a pusher mechanism abutting the cartridge, said pusher mechanism being enveloped by a pusher square, said pusher square having at least one flat surface capable of supporting the secondary electronic component;

[0010] Said pen housing having an internal section which does not interfere with the secondary electronic component until the thrust part is axially assembled to the target position.

[0011] Preferably, one end of said push square is connected to a mounting support, one end of the mounting support having a primary extension oriented towards the push square, the central position of the primary extension being provided axially with a profiled notch conforming to the rectangular structure of the push square, the push square being embedded in the notch, allowing the mounting support to connect to the push square at a predefined angle; said primary extension also being provided radially with a primary fixing hole and a locking lug.

[0012] Preferably, the internal wall of said pen housing is radially provided with a limiting wall integrated in a one-piece manner, the position of the pushing part being defined as the target position when the end face of said fixing support is abutted against said limiting wall.

[0013] Preferably, one end of said fixing support near the limiting wall is axially provided with a secondary fixing hole, and the limiting wall being provided with a through hole corresponding to the secondary fixing hole, a fixing element being provided to pass through the through hole from the end of the limiting wall far from the fixing support and then to connect to the secondary fixing hole, thus fixing one end of the thrust part to the pen housing.

[0014] Preferably, said loading part comprises a case for the mechanical attachment of the cartridge, and a base connecting the case to the pen body, the outer wall of said base abutting the inner wall of the pen body, one end having an extension oriented towards the push-button square, and being provided radially from a mounting hole in the base, the other end of the accumulator being fixed by a corresponding fixing element.

[0015] Preferably, said secondary electronic component further comprises a battery of accumulators, said battery of accumulators comprising a accumulator and a secondary printed circuit board connected to the accumulator, the two ends of said secondary printed circuit board being respectively connected to the base and the mounting support by fastening elements corresponding to the mounting hole of the base and the primary mounting hole, and holding the corresponding accumulator against the push-button square; the face of said accumulator near the push-button square being glued to said push-button square, the other face being butted against the secondary printed circuit board.

[0016] Preferably, said accumulator is disposed on either side of the primary printed circuit board, said secondary printed circuit board covering the accumulator and being provided with fixing clips allowing mechanical attachment with the primary printed circuit board.

[0017] A method for assembling the injector pen comprises the following steps:

[0018] Step 1: Connect the mounting bracket to one end of the push part, aligning the notch located in the center of the primary extension of the mounting bracket with the push square to ensure mechanical engagement;

[0019] Step 2: assemble the case with the base, and connect the base to the other end of the push part, aligning the notch located in the center of the secondary extension of the base with the other end of the push square to ensure a mechanical catch;

[0020] Step 3: Install the primary printed circuit board onto the push button square by aligning the locking tab and the base fixing hole;

[0021] Step 4: Glue the accumulator to both sides of the push square relative to the primary printed circuit board, and install the secondary printed circuit board on the push part by aligning the primary mounting hole and the base mounting hole, while simultaneously compressing the accumulator against the push square;

[0022] Step 5: Insert the assembled push part into the pen case, so that the fixing support is against the limiting wall, while the base at the other end also fits into the pen case;

[0023] Step 6: Adjust the rotation angle of the thrust portion to align the secondary mounting hole on the mounting bracket with the through hole on the limiting wall, and position the spring-loaded needle in contact with the primary electronic component on the pen housing; use a fastening element to pass through the through hole from the end of the limiting wall furthest from the mounting bracket then to connect to the secondary fixing hole, thus fixing the push part to the pen housing and completing the assembly.

[0024] Compared to existing technology, the present invention offers the following advantages:

[0025] (1) The pen case according to the present invention is made by one-piece molding. Compared to the two-half-casing structures assembled in competing products, the pen casing according to the invention is closed in a circular fashion with only openings at two ends, thus eliminating the longitudinal sealing gasket, greatly reducing the length to be sealed, improving sealing and water-repellent performance.

[0026] (2) The present invention provides a pusher housing capable of supporting the The secondary electronic component is located outside the pusher mechanism. The base in the loading section is designed as a mounting piece for one end of the pusher square, while a mounting bracket is installed at the other end. The special structures of the base and mounting bracket allow for direct installation of the secondary electronic component onto the pusher section, thus eliminating the need for internal connecting parts (such as locking tabs or clips) within the pen casing, and avoiding the difficulties of assembling the pusher section and the secondary electronic component in a closed pen casing. Brief description of the figures

[0027] The present invention is described in detail below with reference to the figures and embodiments:

[0028] Fig. 1 is a cross-sectional view of an easy-to-assemble injector pen according to the present invention;

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

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

[0031] Figure 4 is a schematic diagram of the load-bearing part according to the present invention;

[0032] Figure 5 is an installation diagram of the push-button square and the component secondary electronics according to the present invention;

[0033] Figure 6 is a schematic diagram of the structure of the mounting support according to the present invention;

[0034] Where: 1. pen casing, 11. limiting wall, 12. passage hole, 2. loading part, 21. case, 22. base, 221. secondary extension, 222. base fixing hole, 3. cartridge, 31. needle, 32. rubber stopper, 4. pusher part, 411. pusher mechanism, 412. pusher sleeve, 42. stepper motor 43. Push button square, 44. Mounting bracket, 441. Primary extension, 442. Primary mounting hole, 443. Locking lug, 444. Secondary mounting hole, 5. Control section, 6. Primary electronic component, 7. Secondary electronic component, 71. Primary printed circuit board, 72. Accumulator battery, 721. Accumulator, 722. Secondary printed circuit board, 73. Spring-loaded needle. Description of embodiments

[0035] The present invention is described in detail below with reference to specific embodiments:

[0036] As illustrated in [Fig. 1] and [Fig. 2], an easy-to-assemble pen injector comprises a pen body 1. The front end of the pen body 1 is equipped with a loading portion 2. This loading portion 2 is designed to receive a cartridge 3. One end of the cartridge 3 is connected to a needle 31, while the other end is open and fitted with a rubber stopper 32. By pushing said stopper 32, the medicated liquid in the cartridge can be expelled through the needle 31. The pen body 1 contains, within its middle portion, a pusher portion 4. The pusher portion 4 includes a pusher mechanism 41. This pusher mechanism 41 has a pusher 411 arranged coaxially with the pen body 1, a pusher sleeve 412 adapted to the pusher 411, and a stepper motor 42.One end of the pusher 411 is fixed to the actuation end of the stepper motor 42, while its outer wall is provided with an external thread. The inner wall of the pusher sleeve 412 has an internal thread and is coupled by a threaded coupling with the pusher 411. The end of the pusher sleeve 412 away from the stepper motor 42 abuts against the rubber stopper 32 in the cartridge 3. The stepper motor 42 drives the rotation of the pusher 411, which induces a translational movement of the pusher sleeve 412, which is threaded to the pusher 411. This movement pushes the rubber stopper 32 in the cartridge 3 towards the needle 31, thus expelling the medication liquid contained in the cartridge 3. The rear end of the pen housing 1 incorporates a control section 5. This control section 5 is connected to an encoder.During the rotation of the control part 5, the rotation angle information of the control part 5 collected by the encoder is transmitted via a flexible printed circuit board to the stepper motor 42, allowing the user to adjust the amount of medicine pushed from the pusher 411 by rotating the control part 5.

[0037] For sealing purposes, the entire pen case 1 according to the present invention is made in one piece. Compared to the two-part assembled case structures adopted in competing products, the pen case 1 according to the invention is circularly closed with only the openings at both ends, thus eliminating the longitudinal sealing joint, considerably reducing the length to be sealed, improving sealing and water-repellent performance.

[0038] However, although the one-piece design of the pen case 1 ensures excellent sealing, it nevertheless has a major drawback: the confined space inside the pen case 1 makes the assembly of the pusher part 4 and the electrical connections inside the pen case 1 complex.

[0039] To this end, the present invention implements an innovative solution consisting of assembling the pusher part 4 outside the pen case 1, fully inserting the entire assembled pusher part 4 into the pen case 1, and simultaneously establishing the electrical connection between the primary electronic component 6 of the pen case 1 and the secondary electronic component 7 of the pusher part 4. In this embodiment, the primary electronic component 6 is configured as a charging port on the pen case 1.

[0040] More specifically, as illustrated in [Fig.2] and [Fig.5], the push part 4 also includes a push square 43. The push square 43, which encloses the push mechanism 41, is designed in a rectangular structure, with four lateral walls dedicated to the installation of the secondary electronic component 7.

[0041] As illustrated in [Fig. 2] and [Fig. 6], one end of the push square 43 is connected to a mounting bracket 44. One end of the mounting bracket 44 has a primary extension 441 to the push square 43. The central position of the primary extension 441 is axially provided with a profiled notch conforming to the rectangular structure of the push square 43. The push square 43 is recessed into the notch, allowing the mounting bracket 44 to connect to the push square 43 at a predefined angle. The primary extension 441 also has a radially arranged primary mounting hole 442 and a locking lug 443.

[0042] The other end of the push square 43 is connected to the pen housing 1 via the loading section 2. More specifically, as illustrated in [Fig. 4], this loading section 2 comprises a case 21 and a base 22. The case 21 serves to receive the cartridge 3, while the base 22 is fixed to the end of the case 21 furthest from the cartridge 3. One end of the base 22 is provided with a secondary extension 221 oriented towards the push square 43. The central position of the secondary extension 221 is axially provided with a profiled notch conforming to the rectangular structure of the push square 43. The push square 43 is recessed into the notch, allowing the mounting bracket 44 to connect to the push square 43 at a predefined angle. In addition, the secondary extension 221 also has a radially arranged mounting hole for the base 222.

[0043] As illustrated in [Fig. 5], the secondary electronic component 7 comprises a primary printed circuit board 71 and a battery 72. The primary printed circuit board 71 is positioned against a side wall of the push-button square 43; its end near the loading area 2 is secured by a fastener to the mounting hole of the base 222, and the other end is mechanically hooked to the locking lug 443 on the mounting bracket 44. Furthermore, one side of the primary printed circuit board 71 has a retaining clip for mechanically attaching it to the battery 72. Two batteries 72 are mounted in a twin configuration, each fixed to two adjacent walls of the side wall where the primary printed circuit board 71 is mounted.The battery 72 comprises a battery 721 and a secondary printed circuit board 722 connected to the battery 721. The two ends of the secondary printed circuit board 722 are respectively connected to the base 22 and the mounting bracket 44 by means of fasteners corresponding to the mounting hole of the base 222 and the primary mounting hole 442, and hold the corresponding battery 721 against the push-button square 43. The face of the battery 721 near the push-button square 43 is glued by adhesive to the push-button square 43 and the other face is butted against the secondary printed circuit board 722.

[0044] The aforementioned configuration allows the assembly and fixing of the secondary electronic component 7 and the thrust part 4 to be carried out outside the pen case 1. The internal wall of the pen case 1 has a section which does not interfere with the secondary electronic component 7 until the thrust part 4 is axially assembled to the target position, thus allowing an integrated assembly of the thrust part 4 and the secondary electronic component 7 in the pen case 1.

[0045] As illustrated in [Fig. 3], the inner wall of the pen housing 1 is radially provided with a limiting wall 11 integrated as a single unit. Said target position is defined as the position occupied by the thrust portion 4 in the pen housing 1 when the mounting support 44 abuts against the limiting wall 11.

[0046] To fix the assembled thrust element 4 and the secondary electronic component 7 to the pen housing 1, as illustrated in [Fig. 3] and [Fig. 6], one end of the mounting bracket 44 near the limiting wall 11 is axially provided with a secondary mounting hole 444, and the limiting wall 11 is provided with a through hole 12 corresponding to the secondary mounting hole 444. A fastening element is provided to pass through the through hole 12 from the end of the limiting wall 11 furthest from the mounting bracket 44 and then to connect to the secondary mounting hole 444, thus fixing one end of the thrust element 4 to the housing of pen 1. The other end of the push part 4 is fixed by the base 22. The outer wall of the base 22 and the inner wall of the pen case 1 are in tight fit, allowing the other end of the push part 4 and the pen case 1 to be fixed.

[0047] For the connection between the secondary electronic component 7 and the primary electronic component 6 on the pen housing 1, the following structural design is adopted:

[0048] As illustrated in [Fig.5], a spring-loaded needle 73 (pogo pin connector) is arranged vertically on the primary printed circuit board 71; when the secondary electronic component 7 is inserted with the push-button square 43 into its target position in the pen housing 1, the spring-loaded needle 73 is in electrical contact with the charging port of the primary electronic component 6 on the pen housing 1.

[0049] The assembly method according to the invention comprises the following steps:

[0050] Step 1: Connect the mounting bracket 44 to one end of the push part 4, aligning the notch located in the center of the primary extension 441 of the mounting bracket 44 with the push square 43 to ensure a mechanical catch;

[0051] Step 2: assemble the case 21 with the base 22, and connect the base 22 to the other end of the push part 4, aligning the notch located in the center of the secondary extension 221 of the base 22 with the other end of the push square 43 to ensure a mechanical catch;

[0052] Step 3: Install the primary printed circuit board 71 onto the push-button square 43 by aligning the locking lug 443 and the mounting hole of the base 222;

[0053] Step 4: Glue the accumulator 721 to both sides of the push square 43 relative to the primary printed circuit board 71, and install the secondary printed circuit board 722 on the push part 4 by aligning the primary mounting hole 442 and the mounting hole of the base 222, while simultaneously compressing the accumulator 721 against the push square 43; Assemble the secondary electronic component 7 and the push part 4 in this way.

[0054] Step 5: Insert the assembled push part 4 into the pen case 1, so that the fixing support 44 is against the limiting wall 11, while the base 22 at the other end also fits into the pen case 1.

[0055] Step 6: Adjust the angle of rotation of the push part 4 to align the secondary fixing hole 444 on the fixing support 44 with the through hole 12 on the limiting wall 11, and position the spring needle 73 in contact with the primary electronic component 6 on the pen housing 1. Use a fixing element to pass through the through hole 12 from the end of the limiting wall 11 away from the fixing support 44 and then to connect to the secondary fixing hole 444, thus fixing the push part 4 to the pen housing 1 and completing the assembly.

[0056] The embodiments described above are intended solely to illustrate the technical design and features of the present invention, with the aim of enabling those familiar with this technology to understand the content of the invention and implement it accordingly. They shall in no way restrict the scope of protection of the present invention. It is obvious to anyone skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, but may be carried out in other specific forms without deviating from its spirit or essential features. The embodiments presented should be considered purely exemplary and not restrictive in any respect. The scope of the invention is defined exclusively by the appended claims, and not by the preceding description.Therefore, any modification which falls within the equivalent elements of the claims, in their meaning and scope, is expressly considered to fall within the scope of the invention.

Claims

1.

2. Demands Easy-to-assemble injector pen, comprising a pen casing (1), said pen casing (1) being provided at its ends and inside with a loading portion (2) and a pusher portion (4); said loading portion (2) is intended to receive a cartridge (3), while said pusher portion (4) serves to expel the medicated liquid contained in the cartridge (3); characterized in that: the pen case (1) is closed in a circular fashion, its two ends having openings allowing the connection of the loading part (2), and said openings also form a passage through which the pusher part (4) can enter the pen case (1); said pen case (1) and said pusher part (4) are respectively equipped with a primary electronic component (6) and a secondary electronic component (7), said primary electronic component (6) and secondary electronic component (7) simultaneously establish an electrical contact when the pusher part (4) is inserted axially into the pen case (1) to a target position; The primary electronic component (6) comprises a charging port, the secondary electronic component (7) comprises a primary printed circuit board (71) and a spring-loaded needle (73) fixed perpendicularly to the axis on the primary printed circuit board (71), when the secondary electronic component (7) moves with the pusher portion (4) to the target position, the spring-loaded needle (73) mechanically engages with the charging port. Easy-to-assemble injection pen according to claim 1, characterized in that the pusher portion (4) comprises a pusher mechanism (41) abutting the cartridge (3), the pusher mechanism (41) being enclosed in a pusher square (43), the pusher square (43) having at least one flat surface capable of supporting the secondary electronic component (7); said pen case (1) having an internal section which does not interfere with the secondary electronic component (7) until the thrust part (4) is axially assembled to the target position.

3. Easy-to-assemble injector pen according to claim 2, characterized in that one end of said pusher square (43) is connected to a mounting support (44), one end of said mounting support (44) having a primary extension (441) oriented towards the pusher square (43), the central position of said primary extension (441) being axially provided with a profiled notch conforming to the rectangular structure of the pusher square (43), said pusher square (43) being embedded in the notch, allowing the mounting support (44) to connect to the pusher square (43) at a predefined angle; said primary extension (441) also being radially provided with a primary mounting hole (442) and a locking lug (443).

4. Easy-to-assemble injector pen according to claim 3, characterized in that the internal wall of said pen housing (1) is radially provided with a limiting wall (11) integrated in a monobloc manner, the position of the push part (4) being defined as the target position when the end face of said fixing support (44) is abutted against said limiting wall (11).

5. Easy-to-assemble injector pen according to claim 4, characterized in that one end of said fixing support (44) near the limiting wall (11) is axially provided with a secondary fixing hole (444), and said limiting wall (11) being provided with a through hole (12) corresponding to said secondary fixing hole (444), a fixing element being provided to pass through the through hole (12) from the end of the limiting wall (11) away from the fixing support (44) and then to connect to the secondary fixing hole (444), thus fixing one end of the pusher part (4) to the pen housing (1).

6. Easy-to-assemble injector pen according to claim 5, characterized in that said loading part (2) comprises a case (21) for the mechanical attachment of the cartridge (3), and a base (22) connecting said case (21) to the pen housing (1), the outer wall of said base (22) being abutted against the inner wall of the pen housing (1), one end having an extension oriented towards the pusher square (43), and being radially provided with a hole for fixing the base (222).

7. Easy-to-assemble injection pen according to claim 6, characterized in that said secondary electronic component (7) further includes a battery of accumulators (72), said battery of accumulators (72) comprising a accumulator (721) and a secondary printed circuit board (722) connected to the accumulator (721), the two ends of said secondary printed circuit board (722) being respectively connected to the base (22) and the mounting bracket (44) by means of fasteners corresponding to the mounting hole of the base (222) and the primary mounting hole (442), and holding the corresponding accumulator (721) against the pusher square (43); the face of said accumulator (721) near the pusher square (43) being glued to said pusher square (43), the other face being abutted against the secondary printed circuit board (722).

8. Easy-to-assemble injector pen according to claim 7, characterized in that said accumulator (721) is disposed on either side of the primary printed circuit board (71), said secondary printed circuit board (722) covering the accumulator (721) and being provided with fixing clips allowing mechanical attachment with the primary printed circuit board (71).

9. Method of assembling an easy-to-assemble injector pen according to claim 8, characterized in that it comprises the following steps: step 1: connect the fixing support (44) to one end of the pusher part (4), aligning the notch located in the center of the primary extension (441) of the fixing support (44) with the pusher square (43) to ensure mechanical engagement; step 2: assemble the case (21) with the base (22), and connect the base (22) to the other end of the pusher part (4), aligning the notch located in the center of the secondary extension (221) of the base (22) with the other end of the pusher square (43) to ensure mechanical engagement; step 3: install the primary printed circuit board (71) onto the push-button square (43) by aligning the locking lug (443) and the base mounting hole (222);step 4: glue the accumulator (721) to both sides of the push square (43) relative to the primary printed circuit board (71), and install the secondary printed circuit board (722) onto the push part (4) by aligning the primary mounting hole (442) and the; base fixing hole (222), while simultaneously compressing the accumulator (721) against the pusher square (43); step 5: insert the assembled push part (4) into the pen case (1), so that the fixing support (44) is against the limiting wall (11), while the base (22) at the other end also fits into the pen case (1); Step 6: Adjust the angle of rotation of the pusher part (4) to align the secondary fixing hole (444) on the fixing bracket (44) with the through hole (12) on the limiting wall (11), and position the spring needle (73) in contact with the primary electronic component (6) on the pen housing (1); use a fixing element to pass through the through hole (12) from the end of the limiting wall (11) away from the fixing bracket (44) and then to connect to the secondary fixing hole (444), thus fixing the pusher part (4) to the pen housing (1) and completing the assembly.

Images