Torsion spring pre-tension structure for automatic injection pen mounting

Abstract

The utility model discloses a torsional spring pre-tightening structure for automatic injection pen installation relates to injection pen technical field, including position cavity and limit rod, the position cavity is set up on the shell, gasket and connecting rod in the inside of automatic injection pen, limit rod with position cavity intercoordination is used for the position of torsional spring under the pre-tightening state, the utility model discloses through the setting of first slot, second slot, vertical slot and limit rod, set up the position cavity of cooperation with limit rod on the baffle, gasket and connecting rod, the integral position of connecting rod, torsional spring that has been pre-tightened, link pipe, nixie tube and gasket is fixed, again the whole is loaded into the shell together, so that torsional spring can be pre-tightened while being outside, the whole is convenient for installing into the shell, and simple and convenient operation saves time and energy.

Description

Technical Field

[0001] This utility model relates to the field of injection pen technology, specifically to a torsion spring pre-tensioning structure for automatic injection pen installation. Background Technology

[0002] An auto-injection pen is a convenient and easy-to-use medical device widely used in the pharmaceutical field. In clinical practice, auto-injection pens are widely used to treat various diseases, such as diabetes and rheumatoid arthritis. The design of auto-injection pens aims to simplify the drug injection process and improve the convenience and accuracy of patient self-injection. Compared with traditional syringes, auto-injection pens usually have functions such as pre-filled medication and one-button injection. Users only need to unscrew the cap, attach the needle, set the dosage, and then press the button to complete the injection. The operation is simple and convenient. Referring to the accompanying drawings, existing automatic injection pens generally include a shell, a button, an injection assembly, a tensioning assembly, a dosage adjustment assembly, and a locking assembly. The dosage adjustment assembly includes a knob, a connecting rod, a connecting tube, and a digital display. Rotating the knob drives the connecting rod to rotate, which in turn drives the connecting tube to rotate. The rotation of the connecting tube causes the digital display to move on its surface, thereby achieving dosage adjustment. The tensioning assembly includes a torsion spring. One end of the torsion spring is fixed to the connecting tube, and the other end passes through a baffle and is limited by the baffle. When the connecting tube rotates, it drives the torsion spring to rotate and tension the injection assembly. After the dosage adjustment and tensioning are completed simultaneously, pressing the button releases the locking assembly from locking the injection assembly. Under the restoring force of the torsion spring, the injection assembly drives the connecting rod to rotate in the opposite direction. The rotation of the connecting rod, under the action of the screw sleeve, causes the injection assembly to descend and perform the injection operation. Although the automatic injection pen in the aforementioned patent application can achieve dosage adjustment and provide injection power by tightening the torsion spring, and finally achieve automatic injection operation, during the assembly of the automatic injection pen, in order to install components such as connecting rods, torsion springs, connecting tubes, and digital tubes in place, it is generally necessary to pre-tighten the torsion springs. However, since the torsion springs and other components are all inside the outer shell, pre-tightening the torsion springs is quite troublesome and inconvenient. Therefore, it is necessary to design a torsion spring pre-tightening structure for the installation of automatic injection pens to solve the above problems. Utility Model Content

[0003] The purpose of this invention is to design a torsion spring pre-tightening structure for the installation of an automatic injection pen, thereby solving the problem of inconvenient pre-tightening of the torsion spring during installation in existing automatic injection pens as mentioned in the background art.

[0004] To achieve the above-mentioned objectives, this utility model provides the following technical solution: An automatic injection pen mounting torsion spring pre-tensioning structure includes a limiting cavity and a limiting rod. The limiting cavity is located inside the automatic injection pen's outer shell, gasket, and connecting rod. The limiting rod cooperates with the limiting cavity to limit the torsion spring in the pre-tensioned state. Through the cooperation of the limiting cavity and the limiting rod, the torsion spring in the pre-tensioned state can be limited, thus facilitating the installation of the entire structure into the outer shell. The operation is simple, convenient, time-saving, and labor-saving.

[0005] Preferably, the limiting cavity includes a first slot, a second slot, and a vertical groove; the first slot is formed on a baffle plate, which is fixed inside the housing; the second slot, aligned with the first slot, is formed on a gasket, which fits against the baffle plate; the vertical groove, opposite to the first slot, is formed on the side of the connecting rod, and the end of the connecting rod passes through the gasket and the baffle plate in sequence; the limiting cavity formed by the combination of the first slot and the vertical groove cooperates with the limiting rod; the first slot and the second slot are designed to be identical.

[0006] Preferably, the torsion spring is sleeved on the outer surface of the connecting rod, one end of the torsion spring is snapped into the connecting tube, the connecting tube is sleeved on the outer surface of the connecting rod, a digital tube is limited and snapped into the outer surface of the connecting tube, the digital tube is threadedly connected to the outer shell, the gasket is snapped into the top of the connecting tube, the gasket is located inside the digital tube, and both the gasket and the digital tube abut against the baffle; the other end of the torsion spring passes through the gasket and the baffle in sequence, and the torsion spring is abutted by the gasket and the baffle before and after installation, respectively.

[0007] Preferably, the baffle has an arc-shaped groove, and a first arc-shaped opening extends through one side of the bottom of the arc-shaped groove for limiting and abutting the torsion spring after the limit is released; the gasket has a second arc-shaped opening for limiting and abutting the torsion spring when it is limited, and the end of the torsion spring passes through the second arc-shaped opening and the first arc-shaped opening in sequence and extends into the arc-shaped groove.

[0008] Preferably, the top of the limiting rod is provided with a finger ball, the diameter of the finger ball is smaller than the diameter of the limiting rod, and there is an arc transition between the limiting rod and the finger ball.

[0009] Preferably, a rubber sleeve is adhered to the outer surface of the limiting rod, and the rubber sleeve is squeezed to fit tightly against the inner wall of the limiting cavity.

[0010] Preferably, the bottom of the rubber sleeve is located 1 cm above the bottom of the limiting rod; the rubber sleeve includes an integrally formed inverted frustum portion and a cylindrical portion, and the outer diameter of the small circle of the inverted frustum portion of the rubber sleeve is equal to the inner diameter of the limiting cavity.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model, through the setting of a first slot, a second slot, a vertical slot and a limiting rod, creates limiting cavities on the baffle, gasket and connecting rod that cooperate with the limiting rod, thereby limiting and fixing the whole assembly consisting of the connecting rod, the pre-tightened torsion spring, the connecting tube, the digital tube and the gasket. Then, the whole assembly is installed into the outer shell, so that the torsion spring can be pre-tightened on the outside while the whole assembly is easy to install into the outer shell. The operation is simple and convenient, saving time and effort. This utility model, through the design of the finger ball, makes it convenient for operators to pinch the limiting rod, and at the same time, it is convenient to forcefully install or pull out the limiting rod. This utility model, through the design of the rubber sleeve, makes the limiting rod and the limiting cavity fit more tightly, further improving the limiting of the gasket; This invention, through the design of the shape of the rubber sleeve, makes it easy to insert the rubber sleeve into the limiting cavity, while simultaneously limiting the position of the gasket. Attached Figure Description

[0012] To more clearly illustrate the technical solution of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 A frontal cross-sectional view of an existing automatic injection pen; Figure 2 A schematic diagram of a partial frontal cross-sectional structure of an existing automatic injection pen; Figure 3 This is a schematic diagram of the first partial cross-sectional three-dimensional structure of this utility model; Figure 4 This is a schematic diagram of the second partial cross-sectional three-dimensional structure of this utility model; Figure 5 This is a schematic diagram of the three-dimensional structure of the third partial cross-section of this utility model.

[0014] The image shows: 110. Outer shell; 120. Baffle plate; 121. Arc groove; 122. First arc opening; 123. First slot; 210. Connecting rod; 211. Vertical groove; 310. Torsion spring; 410. Connecting tube; 510. Digital tube; 610. Gasket; 611. Second arc opening; 612. Second slot; 710. Limiting rod; 711. Finger ball; 712. Rubber sleeve. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model.

[0016] Therefore, the following detailed description of the embodiments of this utility model is not intended to limit the scope of the claimed utility model, but merely to illustrate some embodiments of the utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0017] It should be noted that, unless otherwise specified, the embodiments and features and technical solutions in the present invention can be combined with each other.

[0018] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0019] The embodiments of this utility model are as follows: See Figure 1-5 As shown, the torsion spring preload structure for automatic injection pen installation includes a limiting cavity and a limiting rod 710; The existing automatic injection pen includes a housing 110, a baffle 120, a connecting rod 210, a torsion spring 310, a connecting tube 410, and a digital tube 510. The baffle 120 is fixed inside the housing 110. The digital tube 510 is threaded to the inner wall of the housing 110, and the inner wall of the digital tube 510 is limited and engaged with the outer surface of the connecting tube 410. The connecting tube 410 is fixedly engaged with the outer surface of the connecting rod 210. The torsion spring 310 is installed between the connecting rod 210 and the connecting tube 410. One end of the torsion spring 310 is fixedly engaged with the end of the connecting tube 410, and the other end of the torsion spring 310 passes through the baffle 120 and is limited by the baffle 120. The end of the connecting rod 210 passes through the baffle 120, and both the connecting tube 410 and the digital tube 510 are fitted to the baffle 120. In this application, the limiting cavity includes a first slot 123, a second slot 612, and a vertical groove 211; the first slot 123 is formed on the baffle 120; the second slot 612, which is aligned with the first slot 123, is formed on the gasket 610, and the end of the gasket 610, which engages with the connecting tube 410, is in contact with the baffle 120; the vertical groove 211, which is opposite to the first slot 123, is formed on the side of the connecting rod 210, and the end of the connecting rod 210 passes through the gasket 610 and the baffle 120 in sequence; the limiting cavity formed by the combination of the first slot 123 and the vertical groove 211 cooperates with the limiting rod 710, and the first slot 123 and the second slot 612 are designed in a consistent manner; The baffle 120 has an arc-shaped groove 121, and a first arc-shaped opening 122 passes through one side of the bottom of the arc-shaped groove 121 for limiting and abutting the torsion spring 310 after the limit is released; the gasket 610 has a second arc-shaped opening 611 passing through it for limiting and abutting the torsion spring 310 when it is pre-tightened, and the end of the torsion spring 310 passes through the second arc-shaped opening 611 and the first arc-shaped opening 122 in sequence and extends into the arc-shaped groove 121; The design of the limiting cavity and the limiting rod 710 allows the connecting rod 210, torsion spring 310, connecting tube 410 and digital tube 510 to be assembled together in sequence. Then, the gasket 610 is placed on the connecting rod 210, and the torsion spring 310 is pre-tightened so that the end of the torsion spring 310 passes through the second arc-shaped opening 611. At this time, the gasket 610 is engaged with the connecting tube 410. Finally, the limiting rod 710 is inserted into the limiting cavity formed by the first slot 123, the second slot 612 and the vertical groove 211 to achieve the limiting of this part of the structure. After the limiting position is reached, the entire assembly consisting of connecting rod 210, torsion spring 310, connecting tube 410, digital tube 510, and washer 610 is installed into the housing 110, so that the limiting rod 710 passes through the first slot 123 on the baffle 120, and at the same time, the part of torsion spring 310 that passes through the washer 610 just passes through the first arc-shaped opening 122 and extends into the arc-shaped groove 121. At this time, the entire assembly consisting of connecting rod 210, torsion spring 310, connecting tube 410, digital tube 510, and washer 610 fits against the baffle 120. Finally, the limiting rod 710 is pulled out, and the torsion spring 310 moves to the other side of the first arc-shaped opening 122 under the action of restoring force and is then limited and abutted, realizing the pre-tightening installation of the torsion spring 310. The operation is simple and convenient, saving time and effort. In this application, the top of the limiting rod 710 is provided with a finger ball 711, the diameter of which is smaller than the diameter of the limiting rod 710. There is an arc-shaped transition between the limiting rod 710 and the finger ball 711. The design of the finger ball 711 makes it convenient for the operator to grip the limiting rod 710, and also facilitates the forceful installation or removal of the limiting rod 710. A rubber sleeve 712 is adhered to the outer surface of the limiting rod 710. When compressed, the rubber sleeve 712 fits tightly against the inner wall of the limiting cavity. The design of the rubber sleeve 712 makes the limiting rod 710 engage more tightly with the limiting cavity, further improving the limiting of the gasket 610; the bottom of the rubber sleeve 712 is located 1cm above the bottom of the limiting rod 710; the rubber sleeve 712 includes an integrally set inverted frustum portion and cylindrical portion, the outer diameter of the small circle of the inverted frustum portion of the rubber sleeve 712 is equal to the inner diameter of the limiting cavity. Through the shape design of the rubber sleeve 712, the rubber sleeve 712 can be easily inserted into the limiting cavity, while realizing the limiting of the gasket 610.

[0020] In the description of this utility model, it should be noted that the terms "upper," "lower," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship conventionally understood by those skilled in the art. These terms are merely for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0021] The above embodiments are only used to illustrate the present utility model and are not intended to limit the technical solutions described in the present utility model. Although the present utility model has been described in detail with reference to the above embodiments, the present utility model is not limited to the specific embodiments described above. Therefore, any modifications or equivalent substitutions to the present utility model, and all technical solutions and improvements that do not depart from the spirit and scope of the utility model, are covered within the scope of the claims of the present utility model.

Claims

1. A torsion spring preload structure for mounting an automatic injection pen, characterized in that, include: A limiting cavity is formed in the outer shell (110), gasket (610) and connecting rod (210) inside the automatic injection pen; as well as The limiting rod (710) cooperates with the limiting cavity to limit the torsion spring (310) in the pre-tightened state.

2. The torsion spring preload structure for installing an automatic injection pen according to claim 1, characterized in that, The limiting cavity includes a first slot (123), a second slot (612), and a vertical groove (211); the first slot (123) is formed on a baffle (120), which is fixed inside the outer shell (110); the second slot (612), which is aligned with the first slot (123), is formed on a gasket (610), which fits against the baffle (120); the vertical groove (211), which is opposite to the first slot (123), is formed on the side of the connecting rod (210), and the end of the connecting rod (210) passes through the gasket (610) and the baffle (120) in sequence. The limiting cavity formed by the combination of the first slot (123) and the vertical slot (211) cooperates with the limiting rod (710); the first slot (123) and the second slot (612) are designed in a consistent manner.

3. The torsion spring preload structure for automatic injection pen installation according to claim 2, characterized in that, The torsion spring (310) is sleeved on the outer surface of the connecting rod (210). One end of the torsion spring (310) is engaged with the connecting tube (410). The connecting tube (410) is sleeved on the outer surface of the connecting rod (210). A digital tube (510) is limited and engaged on the outer surface of the connecting tube (410). The digital tube (510) is threadedly connected to the outer shell (110). The gasket (610) is engaged on the top of the connecting tube (410). The gasket (610) is located inside the digital tube (510). Both the gasket (610) and the digital tube (510) abut against the baffle (120). The other end of the torsion spring (310) passes through the gasket (610) and the baffle (120) in sequence. Before and after installation, the torsion spring (310) is abutted by the gasket (610) and the baffle (120) respectively.

4. The torsion spring preload structure for installing an automatic injection pen according to claim 3, characterized in that, The baffle (120) has an arc-shaped groove (121) and a first arc-shaped opening (122) through one side of the bottom of the arc-shaped groove (121) for limiting and abutting the torsion spring (310) after the limit is released; the gasket (610) has a second arc-shaped opening (611) through it for limiting and abutting the torsion spring (310) when it is limited, and the end of the torsion spring (310) passes through the second arc-shaped opening (611) and the first arc-shaped opening (122) in sequence and extends into the arc-shaped groove (121).

5. The torsion spring preload structure for mounting an automatic injection pen according to claim 4, characterized in that, The top of the limiting rod (710) is provided with a finger ball (711), the diameter of the finger ball (711) is smaller than the diameter of the limiting rod (710), and there is an arc transition between the limiting rod (710) and the finger ball (711).

6. The torsion spring preload structure for mounting an automatic injection pen according to any one of claims 4 or 5, characterized in that, The outer surface of the limiting rod (710) is bonded with a rubber sleeve (712), which is pressed tightly against the inner wall of the limiting cavity.

7. The torsion spring preload structure for mounting an automatic injection pen according to claim 6, characterized in that, The bottom of the rubber sleeve (712) is located 1 cm above the bottom of the limiting rod (710); the rubber sleeve (712) includes an integrally formed inverted frustum portion and a cylindrical portion, and the outer diameter of the small circle of the inverted frustum portion of the rubber sleeve (712) is equal to the inner diameter of the limiting cavity.

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