Automatic injection pen and automatic injection locking structure thereof

Abstract

According to the automatic injection pen and the automatic injection locking structure thereof, the automatic injection locking structure realizes accurate control of the execution loop bar through cooperative work of the extension pen holder, the execution loop bar, the driving spring, the locking ring, the locking structure and the first linkage structure. Specifically, when the extension pen holder actuates, the top end inclined plane is in contact with the protruding inclined plane on the locking ring to push the locking ring to rotate, so that locking of the execution sleeve rod is relieved, and the spring is driven to push the execution sleeve rod to move to an administration position. Compared with the prior art, the injection pen has the advantages that the problem that the injection pen works in a non-working state is solved through an accurate locking structure, the stability and the reliability of the device are improved, and meanwhile, the convenience and the safety of operation are improved.

Description

Technical Field

[0001] This invention relates to the field of medical injection technology, and more specifically, to an automatic injection pen and its automatic injection locking structure. Background Technology

[0002] In medical devices and drug delivery systems, drug delivery devices have become an important component, facilitating accurate medication administration for patients. In the field of automated injection technology, automated injection pens are commonly used for self-injection at home or other non-medical settings, significantly changing people's perceptions of injection therapy. These medical devices are designed to simplify the injection process, reduce operational difficulty, minimize patient pain, and better control drug dosage and injection speed. The design of automated injection pens makes drug administration simpler, safer, and more convenient.

[0003] Automatic injection pens typically have the following characteristics: automatic injection, high safety, easy operation, and convenient drug storage. When using an automatic injection pen, attention should be paid to the source and quality of the drug, proper installation and use of the drug, and attention should be paid to the possibility of allergic reactions.

[0004] Due to their automated nature, autoinjectors have become popular among many healthcare professionals and patients. However, the manufacturing process of autoinjectors is extremely complex, requiring exceptionally high precision and quality from its components. This is because the precision of an autoinjector directly affects its performance and effectiveness. Every component, regardless of size or shape, must undergo rigorous testing and inspection to ensure it meets design requirements and quality standards.

[0005] To meet these requirements, manufacturing autoinjectors typically necessitates the use of high-quality materials. These materials must not only be durable enough to maintain their shape and precision through repeated use, but also accurate enough to ensure precise dosing. These factors put pressure on the manufacturing cost of autoinjectors and can increase the cost of raw materials.

[0006] Therefore, in order to ensure the quality and performance of the product during the production process, precision parts usually need to use high-quality materials to ensure their durability and accuracy, which may increase the cost of raw materials.

[0007] To the best of the applicant's knowledge, Chinese patent CN 209154759 describes an automatic injection pen that uses a locking mechanism between a limiting sleeve and a trigger sleeve to ensure that the trigger sleeve is locked when not in use, preventing the needle from being exposed. During use, the trigger sleeve can be unlocked, exposing the needle for injection. After injection, the trigger sleeve resets and automatically locks again.

[0008] In particular, its release locking mechanism is achieved by the breakage of the connecting part of the locking part. However, if the breakage of the connecting part does not meet expectations, it may cause subsequent operations to fail or cause the machine to operate in an abnormal state due to external forces such as shaking, thus preventing the automatic injection and other operations from being performed normally.

[0009] Therefore, how to design a technical solution that can completely hide the needle and has a simple and reliable mechanism is an important problem facing current technology. Utility Model Content

[0010] In order to overcome the shortcomings of the prior art, the main purpose of this invention is to provide an automatic injection pen and its automatic injection locking structure. Through the locking structure, the malfunction caused by the breakage of the connection part in the prior art is avoided, thereby improving the stability and reliability of the device and further enhancing the ease of operation and safety.

[0011] To achieve the above objectives, the automatic injection locking structure provided in this invention includes:

[0012] An extended pen barrel, movable along a first axis;

[0013] An actuator is movable along a first axis between an initial position and a drug delivery position;

[0014] A drive spring provides the power required to move the actuator lever;

[0015] A locking ring is rotatably sleeved on the actuator rod;

[0016] A locking structure has at least one protrusion on a locking ring and at least one recess on an actuator sleeve; wherein, when the protrusion is within the recess, the locking structure is in a first locked state, locking the actuator sleeve and preventing it from moving; when the protrusion is outside the recess, the locking structure is in a first unlocked state, releasing the locking of the actuator sleeve; and

[0017] A first linkage structure is provided between the extension pen barrel and the locking ring, which enables the extension pen barrel and the locking ring to be driven by the first linkage structure to switch the locking structure from the first locked state to the first unlocked state. Then, the power generated by the pre-compression of the drive spring pushes the actuator rod to move toward the drug delivery position.

[0018] In one embodiment, the first linkage structure has a top inclined surface on the extension pen barrel and a protruding inclined surface on the locking ring, the protruding inclined surface contacting the top inclined surface.

[0019] In one embodiment, the first linkage structure has two protrusions and two guide grooves. The guide grooves are symmetrically recessed on the outer wall surface of the locking ring, and the protrusions are symmetrically protruding on the inner wall surface of the extension pen barrel and located in the guide grooves.

[0020] In one embodiment, the guide groove has a fourth slide groove and a fifth slide groove. The fourth slide groove extends along a first axial direction, and the fifth slide groove is inclined relative to the fourth slide groove, with one end of the fifth slide groove connected to the fourth slide groove, allowing the protrusion to slide in the fifth slide groove and / or the fourth slide groove.

[0021] In one embodiment, the automatic injection locking structure further includes a return spring that provides the power required to extend the pen barrel.

[0022] In one embodiment, the automatic injection locking structure further includes a rotating sleeve rotatably fitted onto the extension pen barrel and used to restrict the movement of the extension pen barrel.

[0023] In one embodiment, the automatic injection locking structure further includes a second linkage structure having a first slide groove, a second slide groove, and a first slider. The first slide groove and the second slide groove extend parallel to each other along a first axial direction on the rotating sleeve, and one end of the second slide groove extending toward the first end position of the pen barrel is connected to the first slide groove. The first slider is disposed on the extension pen barrel and can slide in the second slide groove and / or the first slide groove to realize the linkage and locking between the extension pen barrel and the rotating sleeve.

[0024] In one embodiment, the end of the second slide groove connected to the first slide groove is inclined at an angle, which is between 5 degrees and 45 degrees.

[0025] This application also provides an automatic injection pen comprising:

[0026] A pen holder has a first end and a second end, and the pen holder has a first internal space extending along a first axis from the first end toward the second end.

[0027] A rear pen cap is coaxially disposed on the first end of the pen holder and has a second internal space extending along the first axis and communicating with the first internal space.

[0028] An automatic injection locking structure is disposed in the first internal space inside the pen holder. The automatic injection locking structure includes:

[0029] An extension pen barrel has a third end and a fourth end, and a first internal space movably disposed within a pen holder, capable of moving along a first axis between a protruding position and a retracted position; wherein, when the extension pen barrel is in the retracted position, the fourth end of the extension pen barrel retracts to be flush with the second end of the pen holder; when the extension pen barrel is in the protruding position, the fourth end of the extension pen barrel is exposed outside the second end of the pen holder;

[0030] An actuator is movably disposed in the second internal space of the rear pen cap and can move along the first axis between an initial position and a drug delivery position;

[0031] A drive spring is located between the actuator lever and the rear pen cap;

[0032] A locking ring is rotatably sleeved on the actuator rod and located in the second internal space of the rear pen cover;

[0033] A locking structure has at least one protrusion on a locking ring and at least one recess on an actuator sleeve; wherein, when the protrusion is within the recess, the locking structure is in a first locked state, locking the actuator sleeve and preventing it from moving; when the protrusion is outside the recess, the locking structure is in a first unlocked state, releasing the locking of the actuator sleeve; and

[0034] A first linkage structure is provided between the extension pen barrel and the locking ring, which enables the extension pen barrel and the locking ring to be driven by the first linkage structure to switch the locking structure from the first locked state to the first unlocked state. Then, the power generated by the pre-compression of the drive spring pushes the actuator rod to move toward the drug delivery position.

[0035] In one embodiment, the first linkage structure has a top inclined surface on the extension pen barrel and a protruding inclined surface on the locking ring, the protruding inclined surface contacting the top inclined surface.

[0036] In one embodiment, the first linkage structure has two protrusions and two guide grooves. The guide grooves are symmetrically recessed on the outer wall surface of the locking ring, and the protrusions are symmetrically protruding on the inner wall surface of the extension pen barrel and located in the guide grooves.

[0037] In one embodiment, the guide groove has a fourth slide groove and a fifth slide groove. The fourth slide groove extends along a first axial direction, and the fifth slide groove is inclined relative to the fourth slide groove, with one end of the fifth slide groove connected to the fourth slide groove, allowing the protrusion to slide in the fifth slide groove and / or the fourth slide groove.

[0038] In one embodiment, the automatic injection locking structure further includes a return spring disposed between the pen barrel and the extension pen barrel to provide the power required for the extension pen barrel.

[0039] In one embodiment, the automatic injection locking structure further includes a rotating sleeve rotatably disposed within the first internal space of the pen holder and adjacent to the second end, for restricting the movement of the extended pen barrel.

[0040] In one embodiment, the automatic injection locking structure further includes a second linkage structure having a first slide groove, a second slide groove, and a first slider. The first slide groove and the second slide groove extend parallel to each other along a first axial direction on the rotating sleeve, and one end of the second slide groove extending toward the first end position of the pen barrel is connected to the first slide groove. The first slider is disposed on the extension pen barrel and can slide in the second slide groove and / or the first slide groove to realize the linkage and locking between the extension pen barrel and the rotating sleeve.

[0041] In one embodiment, the end of the second slide groove connected to the first slide groove is inclined at an angle, which is between 5 degrees and 45 degrees.

[0042] Therefore, this work has at least the following characteristics:

[0043] 1. Needle concealment function: The auto-injection pen is equipped with a movable extension barrel. When in the protruding position, the extension barrel is exposed outside the pen barrel, which can effectively hide the needle, improve safety during use, and reduce the risks that may be caused by needle exposure.

[0044] 2. Simplified structure and locking / unlocking function: The locking structure can effectively lock the actuator rod to prevent it from moving unexpectedly; in addition, the extended linkage between the pen and the locking ring enables the unlocking of the locking structure, and the drive spring provides power to push the actuator rod to complete the injection operation, achieving structural stability and precise action.

[0045] 3. High safety and operability: The actuator is located inside the rear pen cap, which avoids the possibility of it being pulled out after injection, further enhancing the safety of use and improving the reliable operation experience of the device.

[0046] The specific techniques used in this work will be further explained through the following embodiments and accompanying drawings. Attached Figure Description

[0047] Figure 1 This is a three-dimensional assembly diagram of the first embodiment of this invention.

[0048] Figure 2 This is a three-dimensional exploded view of the first embodiment of this invention.

[0049] Figure 3 This is a cross-sectional view of the first embodiment of this invention.

[0050] Figure 4 This is a three-dimensional assembly diagram of the second embodiment of this invention.

[0051] Figure 5 This is a three-dimensional exploded view of the second embodiment of this invention.

[0052] Figure 6 This is a cross-sectional view of the second embodiment of the invention.

[0053] Figure 7 for Figure 6 A partial schematic diagram.

[0054] Figure 8 Animation diagram for the second embodiment of this invention.

[0055] Figure 9 for Figure 8A partial schematic diagram.

[0056] Figure 10 Animation diagram for the second embodiment of this invention.

[0057] Figure 11 Animation diagram for the second embodiment of this invention.

[0058] Figure 12 The third embodiment of this invention is shown in the relevant schematic diagram of the first linkage structure.

[0059] Figure 13 This is an exploded view of the third embodiment of this invention.

[0060] Figure 14 The third embodiment of this invention is a schematic diagram of the locking ring.

[0061] In the diagram: 100A: Pen holder; 1001A: First end; 1002A: Second end; 1003A: First internal space; 103, 103A, 103C: Extension pen barrel; 1031, 1031A: Third end; 1032, 1032A: Fourth end; 104, 104A: Return spring; 105A: Rear pen cap; 1051A: Second internal space; 106, 106A: Actuating sleeve; 107, 107A: Locking ring; 108, 108A: Locking structure; 1081, 1081A: Protrusion; 1082, 1082A : Recessed; 109, 109A: Drive spring; 110, 110A: First linkage structure; 1101, 1101A: Top inclined surface; 1102, 1102A: Protruding inclined surface; 1103C: Protrusion; 1104C: Guide groove; 1105C: Fourth slide groove; 1106C: Fifth slide groove; 111, 111A: Rotating sleeve; 112, 112A: Pen cap; 113, 113A: Second linkage structure; 1131, 1131A: First slide groove; 1132, 1132A: Second slide groove; 1133, 1133A: First slider. Detailed Implementation

[0062] The technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0063] In this document, the terms "a" or "an" are used to describe the components and elements described herein. This is used for ease of explanation and to provide a general meaning regarding the scope of this work. Therefore, unless it is clearly intended otherwise, this description should be understood to include one or at least one, and the singular also includes multiples.

[0064] In this document, the terms "comprising," "having," or any other similar terms are intended to cover non-exclusive inclusions. For example, a component or structure containing multiple elements is not limited to those listed herein, but may include other elements not expressly listed but which are generally inherent to the component or structure.

[0065] First, please refer to Figures 1 to 3 The automatic injection locking structure provided in the first embodiment of this invention includes an extension pen 103, an actuating sleeve 106, a locking ring 107, a locking structure 108, a driving spring 109, and a first linkage structure 110. Wherein:

[0066] The extension pen barrel 103 can move along a first axis, which is the same as the axis of the extension pen barrel 103.

[0067] The actuator 106 can move along the first axis between an initial position and a drug delivery position.

[0068] The drive spring 109 provides the power required to move the actuator rod 106.

[0069] The locking ring 107 is rotatably sleeved on the actuator rod 106.

[0070] The locking structure 108 has at least one protrusion 1081 provided on the locking ring 107 and at least one recess 1082 provided on the actuating sleeve 106; wherein, when the protrusion 1081 is located in the recess 1082, the locking structure 108 is in a first locked state, so that the actuating sleeve 106 is locked and cannot move; when the protrusion 1081 is dislodged from the recess 1092, the locking structure 108 is in a first unlocked state, so as to release the lock of the actuating sleeve 106.

[0071] The first linkage structure 110 has a top inclined surface 1101 on the extension pen barrel 103 and a protruding inclined surface 1102 on the locking ring 107, with the protruding inclined surface 1102 contacting the top inclined surface 1101. When the extension pen barrel 103 is actuated, the locking ring 107 rotates by contacting and pushing the top inclined surface 1101 of the extension pen barrel 103 with the protruding inclined surface 1102, causing the protrusion 1081 to move relative to the recess 1082 and disengage from the recess 1082, thus switching the locking structure 108 from a first locked state to a first unlocked state. Then, the force generated by the pre-compression of the drive spring 109 pushes the actuator rod 106 towards the drug delivery position.

[0072] Furthermore, the automatic injection locking structure also includes a return spring 104, a rotating sleeve 111, and a second linkage structure 113, wherein the return spring 104 provides the power required for the extension pen 103. The rotating sleeve 111 is rotatably fitted onto the extension pen 103 and is used to limit the movement of the extension pen 103.

[0073] The second linkage structure 113 has a first slide groove 1131, a second slide groove 1132 and a first slider 1133. The first slide groove 1131 and the second slide groove 1132 extend parallel to each other on the rotating sleeve 111 along the first axis. The end of the second slide groove 1133 extending toward the first end 1001A of the pen holder 100A is connected to the first slide groove 1131. The first slider 1133 is disposed on the extension pen barrel 103 and can slide in the second slide groove 1132 and / or the first slide groove 1131 to realize the linkage and locking between the extension pen barrel 103 and the rotating sleeve 111.

[0074] Furthermore, the end of the second slide groove 1132 that is connected to the first slide groove 1131 is inclined at an angle, which is between 5 degrees and 45 degrees.

[0075] Additionally, please see Figures 4 to 6 The automatic injection pen provided in the second embodiment of this invention includes a pen holder 100A, a rear pen cap 105A, and an automatic injection locking structure.

[0076] The pen holder 100A has a first end 1001A and a second end 1002A, and the pen holder 100A has a first internal space 1003A extending along a first axial direction from the first end 1001A toward the second end 1002A, which can serve as the basis for assembling other components, such as a medicine sleeve and a needle assembly (not shown in the figure).

[0077] The medicine sleeve is housed within the first internal space 1003A of the pen holder 100A. Specifically, the medicine sleeve includes a cylinder, a drive rod, and a piston. The cylinder stores a medicine, and the piston is movably disposed within the cylinder. One end of the drive rod is connected to the piston, and the other end is coaxially connected to the actuating sleeve rod 106A, causing the piston to move under the influence of the actuating sleeve rod 106A. The needle assembly is pre-installed and concealed within the pen holder 100A, and the medicine sleeve is adjacent to the second end 1002A of the pen holder 100A.

[0078] In addition, a detachable cap 112A is attached to the second end 1002A of the pen holder 100A, such as... Figure 3 and Figure 5 As shown.

[0079] One end of the rear pen cap 105A is coaxially disposed on the first end 1001A of the pen holder 100A, and has a second internal space 1051A extending along the first axis and connected to the first internal space 1003A, while the other end of the rear pen cap 105A opposite to the pen holder 100A is a closed end.

[0080] The automatic injection locking structure includes a return spring 104A, an actuator rod 106A, a locking ring 107A, a locking structure 108A, a drive spring 109A, a first linkage structure 110A, and a rotating sleeve 111A.

[0081] The extension pen barrel 103A is a long cylindrical structure with a third end 1031A and a fourth end 1032A. The fourth end 1032A of the extension pen barrel 103A is an open end so that it will not interfere with other internal components, especially the needle assembly, when it moves.

[0082] Specifically, the extension pen barrel 103A is movably disposed within the first internal space 1003A of the pen holder 100A, and can move between a protruding position and a retracted position. When the extension pen barrel 103A is in the retracted position, its fourth end 1032A retracts to be flush with the second end 1002A of the pen holder 100A, as shown below. Figure 8 and Figure 9 As shown.

[0083] When the extension pen barrel 103A is in the protruding position, the fourth end 1032A of the extension pen barrel 103A is exposed beyond the second end 1002A of the pen holder 100A, thus concealing the exposed needle assembly, as shown. Figure 7 or Figure 11 As shown.

[0084] A return spring 104A is provided between the pen holder 100A and the extension pen barrel 103A to provide the power required for the extension pen barrel 103A, for example, to allow the extension pen barrel 103A to spring back from the retracted position to the protruding position.

[0085] The actuator 106A is movably disposed in the second internal space 1051A of the rear pen cover 105A, and one end of the actuator 106A is connected to the medicine sleeve through it, thus enabling it to be in an initial position (e.g., Figure 8 (as shown) and a drug delivery site (e.g.) Figure 6 Move between (as shown).

[0086] A drive spring 109A is disposed between the actuator 106A and the rear pen cap 105A, providing the driving force required for the actuator 106A to move, for example, the actuator 106A from the initial position to the drug delivery position.

[0087] The locking ring 107A is rotatably sleeved on the actuator rod 106A and located in the second internal space 1051A of the rear pen cover 105A.

[0088] The locking structure 108A has at least one protrusion 1081A on the locking ring 107A and at least one recess 1082A on the actuating sleeve 106A, such as Figure 4 As shown. When the protruding part 1081A is inside the recess 1082A, the locking structure 108A is in a first locked state, which locks the actuator 106A and prevents it from moving; when the protruding part 1081A moves out of the recess 1082A, the locking structure 108A is in a first unlocked state, which releases the locking of the actuator 106A.

[0089] The first linkage structure 110A is disposed between the extension pen barrel 103A and the locking ring 107A, and has a top inclined surface 1101A disposed at the third end 1031A of the extension pen barrel 103A and a protruding inclined surface 1102A disposed on the locking ring 107A, the protruding inclined surface 1102A being in contact with the top inclined surface 1101A.

[0090] When the extension pen 103A moves, the locking ring 107A can rotate by contacting and pushing the top inclined surface 1101A of the extension pen 103A through the protruding inclined surface 1102A, thereby switching the locking structure 108A from the first locked state to the first unlocked state. Then, the power generated by the pre-compression of the drive spring 109A pushes the actuator 106A to move towards the drug delivery position, thereby driving the drug sleeve to perform the injection.

[0091] In this example, there are two protruding inclined surfaces 1102A, which are arranged opposite each other on the locking ring 107A, and two top inclined surfaces 1101A, which are arranged opposite each other on the third end 1031A of the extension pen barrel 103A, to ensure the stability and smoothness of the operation.

[0092] The swivel 111A is rotatably disposed within the first internal space 1003A of the pen holder 100A and adjacent to the second end 1002A, in order to restrict the movement of the extension pen barrel 103A.

[0093] The second linkage structure 113A has a first sliding groove 1131A, a second sliding groove 1132A and a first slider 1133A. The first sliding groove 1131A and the second sliding groove 1132A extend parallel to each other on the rotating sleeve 111A along the first axis. The end of the second sliding groove 1132A extending toward the first end 1001A of the pen holder 100A is connected to the first sliding groove 1131A. The first slider 1133A is disposed on the extension pen barrel 103A and can slide in the second sliding groove 1132A and / or the first sliding groove 1131A to realize the linkage and locking between the extension pen barrel 103A and the rotating sleeve 111A.

[0094] Furthermore, the end of the second slide groove 1132A connected to the first slide groove 1131A is inclined at an angle, which is between 5 degrees and 45 degrees.

[0095] Based on the above structural description, the specific steps for using this creation are as follows:

[0096] First, such as Figure 6 As shown, the components of the automatic injection pen are in their initial positions, and in Figure 7 In the process, the first slider 1133A is preset in the second slide groove 1132A, and the extension pen 103A is subjected to the elastic force of the return spring 104A, so that the first slider 1133A is stuck against the groove wall of the second slide groove 1132A away from the pen cylinder 100A, thereby restricting the rotation of the extension pen 103A.

[0097] Next, during injection, the pen cap is removed, and the second end 1002A of the pen barrel 100A rests against an external human body. As the pen is pressed down against the external human body, the extended pen barrel 103A is pushed by the external human body, retracting from its protruding position to an inwardly retracted position flush with the second end 1002A of the pen barrel 100A. This compresses the return spring 104, exposing the needle assembly, which is then inserted into the external human body. Simultaneously, the first slider 1133A is pushed from the second slide groove 1132A into the first slide groove 1131A, and the rotating sleeve 111A releases the restriction on the extended pen barrel 103A. Figure 8 and Figure 9 As shown.

[0098] Meanwhile, during the process of extending the pen barrel 103A from the protruding position to the inward position, the top inclined surface 1101A of the extended pen barrel 103A pushes the protruding inclined surface 1102A of the locking ring 107A, causing the locking ring 107A to rotate, thereby switching the locking structure 108A from the first locked state to the first unlocked state, that is, protruding beyond 1081A.

[0099] Next, the power generated by the pre-compression of the drive spring 109A pushes the actuator rod 106A to move toward the drug delivery position, thereby injecting the drug in the drug sleeve through the needle.

[0100] After the injection is completed, the pen holder 100A is removed from the external body. At this time, the extension pen 103A is also moved away from the external body, allowing the return spring 104A to push the extension pen 103A back to its protruding position. Since the first slider 1133A moves within the first groove 1131A, and the length of the first groove 1131A is greater than the length of the second groove 1132A, the extension pen 103A can protrude further beyond the pen holder 100A, ensuring that the needle assembly is hidden. Figure 10 As shown.

[0101] Furthermore, during the ejection of the extension pen barrel 103A, the rotating sleeve 111A can also be deflected by the extension pen barrel 103A, and when the extension pen barrel 103A is fully ejected to the protruding position, the first slider 1133A falls into the turning point at the end of the first groove 1131A to lock it in place. Figure 11 As shown.

[0102] Therefore, this creation can achieve the following effects:

[0103] 1. Needle concealment function: The auto-injection pen is equipped with a movable extension barrel. When in the protruding position, the extension barrel is exposed outside the pen barrel, which can effectively hide the needle, improve safety during use, and reduce the risks that may be caused by needle exposure.

[0104] 2. Simplified structure and locking / unlocking function: The locking structure can effectively lock the actuator rod to prevent it from moving unexpectedly; in addition, the extended linkage between the pen and the locking ring enables the unlocking of the locking structure, and the drive spring provides power to push the actuator rod to complete the injection operation, achieving structural stability and precise action.

[0105] 3. High safety and operability: The actuator is located inside the rear pen cap, which avoids the possibility of it being pulled out after injection, further enhancing the safety of use and improving the reliable operation experience of the device.

[0106] like Figures 12 to 14The figure shown is a third embodiment of the automatic injection pen of this invention. The difference between this embodiment and the second embodiment lies in the first linkage structure 110C. Specifically, the first linkage structure 110C has two protrusions 1103C and two guide grooves 1104C. These guide grooves 1104C are symmetrically recessed on the outer wall surface of the locking ring 107C, and these protrusions 1103C are symmetrically protruding on the inner wall surface of the extension pen barrel 103C and located in the corresponding guide grooves 1104C. When the extension pen barrel 103C moves, the protrusions 1103C slide in the guide grooves 1104C, and push the locking ring 107C to rotate, thereby smoothly unlocking the locking structure (not shown in the figure).

[0107] Furthermore, the guide groove 1104C has a fourth slide groove 1105C and a fifth slide groove 1106C. The fourth slide groove 1105C extends along the first axial direction. The fifth slide groove 1106C is inclined relative to the fourth slide groove 1105C at an angle between 5 degrees and 45 degrees. One end of the fifth slide groove 1106C is connected to the fourth slide groove 1105C, and the protrusion 1103C can slide in the fifth slide groove 1106C and / or the fourth slide groove 1105C.

[0108] The initial position of the protrusion 1103C is in the fifth slide groove 1106C. When the extension pen barrel 103C moves, the protrusion 1103C slides in the fifth slide groove 1106C and is guided by the tilt angle of the fifth slide groove 1106C, thereby pushing the locking ring 107C to rotate and unlocking the locking structure 108C.

[0109] Furthermore, while unlocking the locking structure 108C, the protrusion 1103C enters the fourth slide groove 1105C from the fifth slide groove 1106C. Then, the power generated by the pre-compression of the drive spring (not shown) pushes the actuator rod (not shown), while the protrusion 1103C moves in the fourth slide groove 1105C to perform subsequent injection operations.

[0110] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An automatic injection locking structure, characterized in that, The automatic injection locking structure includes: An extended pen barrel, movable along a first axis; An actuator is movable along the first axis between an initial position and a drug delivery position; A drive spring provides the power required for the movement of the actuator lever; A locking ring is rotatably sleeved on the actuator rod; A locking structure has at least one protrusion in the locking ring and at least one recess in the actuating sleeve; wherein, when the protrusion is located within the recess, the locking structure is in a first locked state, locking the actuating sleeve and preventing it from moving; when the protrusion is dislodged from the recess, the locking structure is in a first unlocked state, releasing the locking of the actuating sleeve; and A first linkage structure is provided between the extended pen barrel and the locking ring, which enables the extended pen barrel and the locking ring to be driven by the first linkage structure, thereby switching the locking structure from the first locked state to the first unlocked state. Then, the required power is generated by the pre-compression of the drive spring to push the actuator rod toward the drug delivery position.

2. The automatic injection locking structure according to claim 1, characterized in that, The first linkage structure has a top inclined surface on the extended pen barrel and a protruding inclined surface on the locking ring, wherein the protruding inclined surface is in contact with the top inclined surface.

3. The automatic injection locking structure according to claim 1, characterized in that, The first linkage structure has two protrusions and two guide grooves. The guide grooves are symmetrically recessed on the outer wall surface of the locking ring, and the protrusions are symmetrically protruding on the inner wall surface of the extension pen barrel and located in the guide grooves.

4. The automatic injection locking structure according to claim 3, characterized in that, The guide groove has a fourth slide groove and a fifth slide groove. The fourth slide groove extends along a first axial direction. The fifth slide groove is inclined relative to the fourth slide groove, and one end of the fifth slide groove is connected to the fourth slide groove, allowing the protrusion to slide in the fifth slide groove and / or the fourth slide groove.

5. The automatic injection locking structure according to claim 1, characterized in that, It also includes a return spring that provides the power required for the extended pen barrel.

6. The automatic injection locking structure according to claim 5, characterized in that, It also includes a rotating sleeve that is rotatably fitted onto the extension pen barrel and is used to restrict the movement of the extension pen barrel.

7. The automatic injection locking structure according to claim 6, characterized in that, It also includes a second linkage structure having a first slide groove, a second slide groove and a first slider. The first slide groove and the second slide groove extend parallel to each other on the rotating sleeve along the first axis. The end of the second slide groove extending toward a first end position of the pen holder is connected to the first slide groove. The first slider is disposed on the extension pen barrel and can slide in the second slide groove and / or the first slide groove to realize the linkage and locking between the extension pen barrel and the rotating sleeve.

8. The automatic injection locking structure according to claim 7, characterized in that, The end of the second slide groove connected to the first slide groove is inclined at an angle, which is between 5 degrees and 45 degrees.

9. An automatic injection pen, characterized in that, The automatic injection pen includes: A pen holder has a first end and a second end, and the pen holder has a first internal space extending along a first axis from the first end toward the second end. A rear pen cap, coaxially disposed on the first end of the pen holder, and having a second internal space extending along the first axial direction and communicating with the first internal space; and An automatic injection locking structure is disposed in the first internal space within the pen holder, the automatic injection locking structure comprising: An extension pen barrel has a third end and a fourth end, and is movably disposed within a first internal space of the pen holder, capable of moving along a first axis between a protruding position and a retracted position; wherein, when the extension pen barrel is in the retracted position, the fourth end of the extension pen barrel retracts to be flush with the second end of the pen holder; when the extension pen barrel is in the protruding position, the fourth end of the extension pen barrel is exposed outside the second end of the pen holder; An actuator is movably disposed in the second internal space of the rear pen cap and is movable along the first axis between an initial position and a drug delivery position; A drive spring is disposed between the actuator sleeve and the rear pen cap; A locking ring is rotatably sleeved on the actuating sleeve and located within the second internal space of the rear pen cover; A locking structure has at least one protrusion in the locking ring and at least one recess in the actuating sleeve; wherein, when the protrusion is located within the recess, the locking structure is in a first locked state, locking the actuating sleeve and preventing it from moving; when the protrusion is dislodged from the recess, the locking structure is in a first unlocked state, releasing the locking of the actuating sleeve; and A first linkage structure is provided between the extended pen barrel and the locking ring, which enables the extended pen barrel and the locking ring to be driven by the first linkage structure, thereby switching the locking structure from the first locked state to the first unlocked state. Then, the required power is generated by the pre-compression of the drive spring to push the actuator rod toward the drug delivery position.

10. The automatic injection pen according to claim 9, characterized in that, The first linkage structure has a top inclined surface on the extended pen barrel and a protruding inclined surface on the locking ring, wherein the protruding inclined surface is in contact with the top inclined surface.

11. The automatic injection pen according to claim 9, characterized in that, The first linkage structure has two protrusions and two guide grooves. The guide grooves are symmetrically recessed on the outer wall surface of the locking ring, and the protrusions are symmetrically protruding on the inner wall surface of the extension pen barrel and located in the guide grooves.

12. The automatic injection pen according to claim 11, characterized in that, The guide groove has a fourth slide groove and a fifth slide groove. The fourth slide groove extends along a first axial direction. The fifth slide groove is inclined relative to the fourth slide groove, and one end of the fifth slide groove is connected to the fourth slide groove, allowing the protrusion to slide in the fifth slide groove and / or the fourth slide groove.

13. The automatic injection pen according to claim 9, characterized in that, The automatic injection locking structure further includes a return spring located between the pen barrel and the extension pen barrel, providing the power required by the extension pen barrel.

14. The automatic injection pen according to claim 13, characterized in that, The automatic injection locking structure further includes a rotating sleeve, which is rotatably disposed within the first internal space of the pen holder and adjacent to the second end, to restrict the movement of the extension pen barrel.

15. The automatic injection pen according to claim 14, characterized in that, The automatic injection locking structure further includes a second linkage structure, having a first slide groove, a second slide groove, and a first slider. The first slide groove and the second slide groove extend parallel to each other along the first axial direction on the rotating sleeve, and one end of the second slide groove extending toward the first end position of the pen barrel is connected to the first slide groove. The first slider is disposed on the extension pen barrel and can slide in the second slide groove and / or the first slide groove to realize the linkage and locking between the extension pen barrel and the rotating sleeve.

16. The automatic injection pen according to claim 15, characterized in that, The end of the second slide groove connected to the first slide groove is inclined at an angle, which is between 5 degrees and 45 degrees.

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