Mechanical automatic injection pen

Abstract

The present application is a mechanical automatic injection pen for installing a needle with a medicine to perform an injection operation. The mechanical automatic injection pen comprises a first component and a second component which can be combined. The first component comprises a first tube, a pulling member, a push rod, a locking member, a first elastic member and a second elastic member, and the second component comprises a second tube and an actuating member. The locking member is actuated by the actuating member to release the locking state of the push rod, so that the push rod moves along an axis towards the needle by the second elastic member to push the medicine to perform the injection operation. When the injection operation is completed, the pulling member can be moved along the axis by an external force in a direction away from the second tube, thereby gradually driving the push rod to return to the position before the injection operation, so that the push rod is locked again by the locking member. The pulling member is returned to the position before being moved by the external force by the first elastic member. Accordingly, the push rod is returned to the home position by operating the pulling member, so as to achieve the effect of being reusable.

Description

TECHNICAL FIELD

[0001] The present application relates to an automatic injection pen, and more particularly to a reusable mechanical automatic injection pen.

BACKGROUND

[0002] In the past, when patients need to inject medicine, they always need to ask for help from medical staff to perform the injection procedure. With the progress of medical technology, automatic injection pens that can be operated by patients have been widely used. Patients can complete the injection of medicine by operating the automatic injection pen with one hand, saving medical manpower and resources, and improving the convenience and flexibility of injection.

[0003] However, existing automatic injection pens are usually disposable, which can only be discarded after use and easily cause waste of resources and money. Moreover, in order to achieve the purpose of automatic injection, the structure of the existing automatic injection pen is often too complex, resulting in an increase in manufacturing cost. Therefore, how to achieve the purpose of reusable automatic injection pen and simplify the structure and number of assembly parts is a subject worthy of study.

SUMMARY

[0004] The present application is made in view of the above problems, and aims to provide a mechanical automatic injection pen that can be reused and has a simplified structure design to reduce waste of resources and money.

[0005] The mechanical automatic injection pen of the present application comprises a first assembly and a second assembly. The first assembly comprises a first tube, a pulling member, a push rod, a locking member, a first elastic member, and a second elastic member. The first tube comprises opposite first and second ends. The pulling member is movably inserted into the first tube along an axis from the first end of the first tube, and one end of the pulling member comprises an opening. The push rod is inserted into the first tube and the pulling member along the axis from the second end of the first tube, and one end of the push rod is exposed through the opening. The locking member is combined with the second end of the first tube, and is used to lock the push rod. The first elastic member abuts the first tube and the pulling member at two ends respectively. The second elastic member abuts the first tube and the push rod at two ends respectively.

[0006] The second assembly is combined with the first assembly along the axis and forms a space for accommodating the needle, and the second assembly comprises a second tube and an actuating member. The second tube is combined with the second end of the first tube; the actuating member is arranged in the second tube, and one end of the actuating member abuts against the locking member. The locking member is actuated by the actuating member to release the locking state of the push rod, so that the push rod is moved along the axis towards the needle by the second elastic member to push the medicine and perform the injection operation; after the injection operation is completed, the pulling member can be moved along the axis by an external force in a direction away from the second tube, thereby gradually driving the push rod to return to the position before the injection operation, so that the push rod is locked again by the locking member; and the pulling member is returned to the position before being moved by the external force by the first elastic member.

[0007] In one embodiment of the present application, the push rod further comprises a traction part arranged at the end of the push rod away from the needle, and the cross-sectional diameter of the traction part is greater than the cross-sectional diameter of the opening of the pulling member.

[0008] In one embodiment of the present application, the locking member further comprises at least one locking part, and the push rod further comprises at least one corresponding locking part; the locking member and the push rod are mutually engaged by the at least one locking part and the at least one corresponding locking part to form the locking state.

[0009] In one embodiment of the present application, the first tube further comprises an abutting part arranged at the first end, and the pulling member further comprises a corresponding abutting part arranged on the outer surface of the pulling member; the two ends of the first elastic member abut against the abutting part of the first tube and the corresponding abutting part of the pulling member, respectively.

[0010] In one embodiment of the present application, the actuating member further comprises a first actuating end and a second actuating end; the first actuating end abuts against the locking member, and the second actuating end protrudes from the second tube and surrounds the needle of the needle.

[0011] In one embodiment of the present application, a cover is further included, and the cover is combined with the other end of the second assembly.

[0012] In one embodiment of the present application, the cover further comprises a needle protection part; when the cover is combined with the second assembly, the needle protection part is inserted into the second actuating end of the actuating member and accommodates the needle of the needle.

[0013] In one embodiment of the present application, before the mechanical automatic injection pen performs the injection operation, the first elastic member is in a relaxed state, and the second elastic member is in a compressed state.

[0014] In one embodiment of the present application, the at least one corresponding locking part is arranged between the two end parts of the push rod.

[0015] In one embodiment of the present application, the push rod further comprises a rubber plug arranged at the end of the push rod close to the needle.

[0016] The mechanical automatic injection pen of the present application can be operated by pulling the pulling member to return the push rod to its original position after the injection operation, so that the user can replace the new needle, so that the mechanical automatic injection pen of the present application can be reused, so as to avoid waste of resources and money. In addition, the mechanical automatic injection pen of the present application can effectively simplify the structure design of the related components and improve the convenience of assembly.

[0017] The specific techniques adopted by the present application will be further described through the following examples and accompanying drawings.

DRAWINGS

[0018] Figure 1 is a schematic view of the appearance of the mechanical automatic injection pen of the present application.

[0019] Figure 2 is an exploded view of the mechanical automatic injection pen of the present application.

[0020] Figure 3 is a cross-sectional view of the mechanical automatic injection pen of the present application.

[0021] Figure 4 is a cross-sectional view of the mechanical automatic injection pen of the present application after the injection operation.

[0022] Figure 5 is a cross-sectional view of the mechanical automatic injection pen of the present application after the injection operation.

[0023] Main component symbol explanation:

[0024] 1 mechanical automatic injection pen

[0025] 10 first component

[0026] 11 first tube

[0027] 111 first end

[0028] 112 second end

[0029] 113 abutting portion

[0030] 12 pulling member

[0031] 121 opening

[0032] 122 corresponding abutting portion

[0033] 13 push rod

[0034] 131 traction portion

[0035] 132 corresponding locking portion

[0036] 133 rubber plug

[0037] 14 locking member

[0038] 141 elastic arm

[0039] 142 locking portion

[0040] 15 first elastic member

[0041] 16 second elastic member

[0042] 20 second assembly

[0043] 21 second tube body

[0044] 211 inspection hole

[0045] 22 actuating member

[0046] 221 first actuating end

[0047] 222 second actuating end

[0048] 30 cap body

[0049] 31 needle protection portion

[0050] 90 needle device

[0051] 91 needle

[0052] L-axis

DETAILED DESCRIPTION

[0053] Since various modifications and changes can be made to the embodiments without departing from the scope of the application, it is intended that all matters contained in the above description be interpreted as illustrative and not in a limiting sense. The scope of the application should be determined by a fair reading of the appended claims and their legal equivalents.

[0054] In this document, the terms "a" or "an" are used, as is common in patent documents, to include one or at least one, and the singular form "a" or "an" is intended to include one or at least one of one or more items. Accordingly, the terms "a" (or "an"), "one or more" and "at least one" can be used interchangeably herein.

[0055] In this document, the terms "first" and "second" are used, as is common in patent documents, merely to distinguish or identify different components or structures. It should be understood that these terms are not intended to limit the scope of the application, and the terms "first" and "second" can be interchangeable under certain circumstances.

[0056] As used herein, the terms "comprises", "comprising", or any other variation thereof, are intended to cover a non-exclusive inclusion. For example, a component or structure that comprises a list of elements is not limited to only those elements but can include other elements not expressly listed or inherent to such component or structure.

[0057] The mechanical automatic injection pen of the present application can be equipped with a needle with a medicament, and after being actuated, the plunger pushes the medicament to perform injection operation for the user, and after the injection operation is completed, a new needle can be replaced to achieve the effect of repeated use. Please refer to Figures 1 to 3 , wherein Figure 1 is a schematic diagram of the appearance of the mechanical automatic injection pen of the present application, Figure 2 is an exploded view of the mechanical automatic injection pen of the present application, Figure 3 is a cross-sectional view of the mechanical automatic injection pen of the present application.

[0058] As Figures 1 to 3 shown, the mechanical automatic injection pen 1 of the present application comprises a first assembly 10 and a second assembly 20, and the first assembly 10 and the second assembly 20 are combined to correspond to the axis L as a whole, so that each movable component in the first assembly 10 or / and the second assembly 20 moves relative to other components along the direction of the axis L. A receiving space for accommodating the needle 90 can be formed in the second assembly 20, so that when the first assembly 10 and the second assembly 20 are separated, the user can accommodate the needle 90 in the second assembly 20 or replace the needle 90. Each component in the first assembly 10 and the second assembly 20 can be made of the same or different strong materials, such as plastic material, metal or alloy, but is not limited thereto.

[0059] The first assembly 10 comprises a first tube 11, a pulling member 12, a plunger 13, a locking member 14, a first elastic member 15 and a second elastic member 16. In terms of structural design, the first tube 11, the pulling member 12, the plunger 13 and the locking member 14 are similar to tubular members in appearance, so that the hollow parts of the aforementioned components can accommodate or pass through the corresponding components, but the present application is not limited thereto.

[0060] The first tube 11 comprises opposite first and second ends 111 and 112, and the first and second ends 111 and 112 are open ends. In an embodiment of the present application, the first tube 11 further comprises an abutting portion 113, which is arranged at the first end 111, for example, the abutting portion 113 is a flange structure extending inwardly along the vertical axis L, but the present application is not limited thereto.

[0061] The pulling member 12 is movably inserted into the first tube 11 along the axis L from the first end 111 of the first tube 11, and the pulling member 12 is movable relative to the first tube 11 along the axis L. One end of the pulling member 12 inserted into the first tube 11 includes an opening 121, so that the end forms an open end, and the other opposite end of the pulling member 12 is a closed end. In an embodiment of the present application, the pulling member 12 further includes a corresponding abutting portion 122, which is arranged on the outer surface of the pulling member 12, for example, near the aforementioned open end.

[0062] In order to cooperate with the abutting portion 113 of the aforementioned first tube 11, the corresponding abutting portion 122 can be a flange structure extending outwardly along the vertical axis L, but the present application is not limited thereto. By cooperating the corresponding abutting portion 122 of the pulling member 12 with the abutting portion 113 of the first tube 11, when the pulling member 12 is moved relative to the first tube 11 along the axis L, a stop effect is generated without being separated from the first tube 11.

[0063] The push rod 13 is movably inserted into the first tube 11 and the pulling member 12 along the axis L from the second end 112 of the first tube 11, and the push rod 13 is movable relative to the first tube 11 and the pulling member 12 along the axis L. One end of the push rod 13 away from the needle 90 passes through the opening 121 of the pulling member 12. In an embodiment of the present application, the push rod 13 further includes a traction portion 131 arranged on the end of the push rod 13 away from the needle 90, so that the traction portion 131 is between the open end and the opposite closed end of the pulling member 12 having the opening 121. The traction portion 131 is arranged on the outer surface of the push rod 13, for example, the traction portion 131 can be a flange structure extending outwardly along the vertical axis L, but the present application is not limited thereto.

[0064] In terms of structural design, the cross-sectional diameter of the traction portion 131 is greater than the cross-sectional diameter of the opening 121 of the pulling member 12, that is, the traction portion 131 cannot pass through the opening 121 of the pulling member 12 during movement, not only making the push rod 13 generate a stop effect when moving relative to the first tube 11 and the pulling member 12 along the axis L without being separated from the pulling member 12, but also enabling the push rod 13 to be moved by the pulling member 12 through the traction portion 131.

[0065] The push rod 13 further includes at least one corresponding locking portion 132. The at least one corresponding locking portion 132 is located between the two end portions of the push rod 13. In the present embodiment, the push rod 13 can include two corresponding locking portions 132 arranged symmetrically, and each corresponding locking portion 132 can be a groove structure, but the structure and number of the corresponding locking portion 132 are not limited thereto. In an embodiment of the present application, the push rod 13 further includes a rubber plug 133. The rubber plug 133 is arranged on the end of the push rod 13 close to the needle 90, that is, the opposite end of the end of the push rod 13 having the traction portion 131.

[0066] The locking member 14 is combined with the second end 112 of the first tubular body 11. The locking member 14 is used to lock the push rod 13 before performing the injection operation or after completing the injection operation. In one embodiment of the present application, the locking member 14 includes at least one locking portion 142, and the locking member 14 is engaged with the at least one corresponding locking portion 132 of the push rod 13 through the at least one locking portion 142 to form a locking state. In this embodiment, the locking member 14 can include two symmetrically arranged locking portions 142, and each locking portion 142 can be a protruding block structure matched with the groove structure, and each locking portion 142 can be arranged on the corresponding elastic arm 141, but the structure and the number of the locking portions 142 are not limited thereto.

[0067] The first elastic member 15 is arranged between the first tubular body 11 and the pulling member 12, and the two ends of the first elastic member 15 abut against the first tubular body 11 and the pulling member 12 respectively, so that the pulling member 12 can be returned to the original position through the first elastic member 15 after moving relative to the first tubular body 11. In one embodiment of the present application, the two ends of the first elastic member 15 abut against the abutting portion 113 of the first tubular body 11 and the corresponding abutting portion 122 of the pulling member 12 respectively. In the present application, the first elastic member 15 is in a relaxed state before performing the injection operation.

[0068] The second elastic member 16 is arranged between the first tubular body 11 and the push rod 13, and the two ends of the second elastic member 16 abut against the first tubular body 11 and the push rod 13 respectively, so that the push rod 13 can be driven by the elastic driving force provided by the second elastic member 16 to move towards the needle 90. In the present application, the second elastic member 16 is in a compressed state before performing the injection operation.

[0069] The second assembly 20 can be combined with the first assembly 10 and the cover 30 respectively. The second assembly 20 includes a second tubular body 21 and an actuating member 22. In terms of structural design, the second tubular body 21 and the actuating member 22 are similar to tubular members in appearance, so that the hollow parts of the aforementioned components can be used to accommodate the corresponding components, but the present application is not limited thereto.

[0070] The second tubular body 21 includes two opposite ends, and the two ends are both open ends. One end of the second tubular body 21 is combined with the second end 112 of the first tubular body 11.

[0071] Actuator 22 passes through the second tube 21, and one end of actuator 22 abuts against locking fastener 14. In one embodiment of the invention, actuator 22 includes a first actuating end 221 and a second actuating end 222. Actuator 22 abuts against locking fastener 14 through the first actuating end 221, and the second actuating end 222 protrudes from the second tube 21 and surrounds the needle tip 91 of needle 90. Accordingly, actuator 22 can provide protection for needle tip 91 of needle 90 through the second actuating end 222 before performing injection operation, and actuate locking fastener 14 through the first actuating end 221 during injection operation.

[0072] In one embodiment of the present invention, the mechanical automatic injection pen 1 of the present invention further includes a cover 30, which is coupled to the other end of the second component 20 to cover and protect the needle 90. In one embodiment of the present invention, the cover 30 includes a needle protection portion 31, which, when coupled to the second component 20, is inserted into the second actuation end 222 of the actuator 22 through the needle protection portion 31 to accommodate the needle 91 of the needle 90.

[0073] The following will be coordinated Figures 3 to 5 To further illustrate the corresponding structural actions of the mechanical automatic injection pen 1 of the present invention before and after performing the injection operation, wherein... Figure 4 This is a cross-sectional view of the mechanical automatic injection pen of the present invention after performing an injection operation. Figure 5 This is a cross-sectional view of the mechanical automatic injection pen of the present invention, showing the push rod returning to its position before the injection operation after the injection operation is performed.

[0074] like Figure 3 As shown, when a user wishes to use the mechanical automatic injection pen 1 of the present invention, they first remove the cover 30, exposing the second actuating end 222 of the actuator 22 of the second component 20. Next, the user holds the mechanical automatic injection pen 1 of the present invention, presses the exposed second actuating end 222 of the actuator 22 against the body part to be injected, and applies force to the skin, causing the actuator 22 to move inward toward the first component 10. At this time, the first actuating end 221 of the actuator 22 pushes against the locking member 14 of the first component 10, causing each elastic arm 141 of the locking member 14 to move its corresponding locking part 142 away from the axis L and disengage from the corresponding locking part 132 of the push rod 13, thereby releasing the locking member 14 from the locking state of the push rod 13.

[0075] Therefore, the push rod 13, in an undisturbed state, is actuated by the compressed second elastic element 16 and moves along the axis L toward the needle 90. This, in turn, pushes the medication within the needle 90 through the rubber stopper 133 of the push rod 13, causing the medication to be output through the needle tip 91, thus performing the injection operation. After the injection operation is completed, the mechanical automatic injection pen 1 of the present invention will appear as follows: Figure 4 The state shown.

[0076] like Figure 4 As shown, after the injection operation is completed, the user can first move the mechanical automatic injection pen 1 of the present invention away from its body. Then, the user can apply an external force to the pulling member 12, causing the pulling member 12 to move relative to the first tube 11 along the axis L in a direction away from the second tube 21. During the movement of the pulling member 12, the open end of the pulling member 12 with the opening 121 will contact the traction part 131 of the push rod 13. Since the cross-sectional diameter of the traction part 131 of the push rod 13 is greater than the cross-sectional diameter of the opening 121 of the pulling member 12, the pulling member 12 can push against the traction part 131 of the push rod 13 through the open end, thereby driving the push rod 13 to move in a direction away from the needle 90.

[0077] As the push rod 13 gradually moves and returns to its position before the injection operation, at least one corresponding locking part 132 of the push rod 13 will engage with at least one locking part 142 of the locking member 14 to form a locked state, so that the push rod 13 is locked by the locking member 14 again. In addition, as the pulling member 12 moves relative to the first tube 11, the first elastic member 13 will be gradually compressed and accumulate elastic potential energy.

[0078] In terms of structural design, since each locking part 142 of the locking fastener 14 engages with each corresponding locking part 132 of the push rod 13 via a corresponding elastic arm 141, thereby generating a spring impact and producing a sound, the user can use this to confirm whether the push rod 13 has been locked. After confirming that the push rod 13 has been locked, the user can stop applying external force to the pulling member 12. At this time, the pulling member 12 will be moved in the opposite direction relative to the first tube 11 by the elastic potential energy of the first elastic member 15, returning to the position before the external force moved it. Finally, the mechanical automatic injection pen 1 of the present invention will return to the position before the external force moved it. Figure 1 The image shows the state before the injection procedure, so that the user can reuse the needle after changing to a new one.

[0079] Furthermore, in terms of structural design, the second tube 21 also includes an inspection section 211. The inspection section 211 allows the user to confirm the injection status of the medication inside the needle 90. The inspection section 211 is disposed on the outer surface of the second tube 21. In one embodiment of the present invention, the inspection section 221 may be made of a transparent material to facilitate the user's inspection of the needle 90 through the inspection section 221.

[0080] The foregoing implementations are merely illustrative of the application and are not intended to limit or restrict the scope of the application in any way. Thus, the foregoing implementations are illustrative only and should not be considered limiting in any regard. The application is defined only by the claims— a procedural recitation of the application followed by statements of intended applications. Thus, techniques of the present application could be utilized in other applications and not only for the applications described above without departing from the spirit and essential characteristics of the present application. The claims should not be restricted to the applications presented by the foregoing constructions carrying out the present application.

Claims

1. A mechanical automatic injection pen, used to mount a needle containing a drug to perform an injection operation, characterized in that, The mechanical automatic injection pen comprises: a first component, which comprises: a first tube body, which comprises a first end and a second end; a pulling member, which is movably arranged in the first tube body along an axis from the first end of the first tube body, and one end of the pulling member comprises an opening; a push rod, which is movably arranged in the first tube body and the pulling member along the axis from the second end of the first tube body, and one end of the push rod away from the needle passes through the opening; a locking member, which is combined with the second end of the first tube body, and the locking member is used to lock the push rod; a first elastic member, both ends of which are respectively abutted against the first tube body and the pulling member; and a second elastic member, both ends of which are respectively abutted against the first tube body and the push rod; and a second component, which is combined with the first component along the axis and forms a containing space for arranging the needle, and the second component comprises: a second tube body, which is combined with the second end of the first tube body; and an actuating member, which is arranged in the second tube body, and one end of the actuating member is abutted against the locking member; wherein the actuating member is used to actuate the locking member to release the locking state of the push rod, so that the push rod is moved along the axis towards the needle by the second elastic member to push the medicament to perform the injection operation; when the injection operation is completed, the pulling member can be moved along the axis by external force towards the direction away from the second tube body, thereby gradually driving the push rod to return to the position before the injection operation, so that the push rod is locked by the locking member again; and the pulling member is returned to the position before being moved by the external force by the first elastic member; wherein when the mechanical automatic injection pen is before performing the injection operation, the first elastic member is in a relaxed state, and the second elastic member is in a compressed state; 2. The mechanical auto-injector of claim 1, wherein, the push rod further comprises a rubber plug, which is arranged at one end of the push rod close to the needle.

3. The mechanical auto-injector of claim 2, wherein, wherein the push rod further comprises a pulling part, which is arranged at one end of the push rod away from the needle, and the cross-sectional length of the pulling part is greater than the cross-sectional length of the opening of the pulling member.

4. The mechanical auto-injector of claim 1, wherein, wherein the locking member further comprises at least one locking part, and the push rod further comprises at least one corresponding locking part, the locking member and the push rod are mutually engaged by the at least one locking part and the at least one corresponding locking part to form the locking state.

5. The mechanical auto-injector of claim 1, wherein, wherein the first tube body further comprises an abutment part arranged at the first end, and the pulling member further comprises a corresponding abutment part arranged on an outer surface of the pulling member; both ends of the first elastic member are respectively abutted against the abutment part of the first tube body and the corresponding abutment part of the pulling member.

6. The mechanical auto-injector of claim 5, wherein the needle guard is configured to move from the first position to the second position when the plunger reaches the second position. wherein the actuating member comprises a first actuating end and a second actuating end, the first actuating end is abutted against the locking member, and the second actuating end protrudes from the second tube body and surrounds a needle head of the needle. wherein further comprising a cover, which is combined with the other end of the second component.

7. The mechanical auto-injector of claim 6, wherein the needle guard is configured to move from the first position to the second position when the plunger reaches the second position. wherein said cap further comprises a needle protection portion for insertion into said second actuation end of said actuation member and for housing said needle of said needle device when said cap is coupled to said second component.

8. The mechanical auto-injector of claim 3, wherein, wherein said at least one corresponding locking portion is disposed between two end portions of said push rod.

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