Safety structure for a needleless injector and needleless injector

Abstract

This utility model relates to the field of medical device technology, and provides a safety structure and a needle-free injector based on a needle-free injector. The safety element is disposed within the upper housing, located in the trigger direction of the injection button, and contacts and matches the inclined inner surface of the upper housing, allowing the safety element to move radially when the upper housing is pressed. The safety element includes a ring-shaped body and contact blocks and blocking blocks disposed on opposite sides of it. The blocking blocks protrude towards the injection button, and the contact blocks contact and match the inclined surface of the upper housing. The safety structure and core structure of the needle-free injector based on this utility model can be completely housed within the upper housing, reducing the risk of jamming due to external contaminants and improving reliability. The unlocking action is consistent with the pressing action and precedes the injection action. This pre-emptive unlocking action reduces the possibility of accidental triggering of the subsequent injection action, thereby effectively reducing the risk of accidental injection and improving safety.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a safety structure based on a needleless injector and a needleless injector. Background Technology

[0002] Needle-free injectors are medical devices that use instantaneous high pressure generated by a power source to create a high-speed, high-pressure jet of medication through a nozzle (the flow rate is generally greater than 100m / s), allowing the medication to penetrate the outer layer of the skin and release its effects into the subcutaneous and intradermal tissue layers. They have the advantages of reducing pain and avoiding the risk of cross-infection, and are gradually replacing traditional needle injectors. They are medical devices that can be used in both hospitals and homes.

[0003] To generate a high-speed, high-pressure jet stream, a kinetic energy component is installed inside. Therefore, to prevent accidents caused by operator misoperation triggering the kinetic energy component, the product is generally equipped with a safety device.

[0004] In the prior art, the safety device is generally a button that protrudes from the outer wall. This button structure is easily triggered by accident, and the button structure requires an outlet hole on the outer shell, which makes it easy for contaminants to enter and get stuck, reducing the reliability of reusable needle-free injectors. Utility Model Content

[0005] Therefore, the purpose of this utility model is to provide a safety structure based on a needleless injector and a needleless injector, so as to solve the problem of insufficient reliability of the safety design of reusable needleless injectors in the prior art.

[0006] This utility model provides a safety structure based on a needle-free injector, comprising: an upper shell sleeved over the injection button on the top of the needle-free injector, and a safety element positioned in the trigger direction of the injection button, wherein...

[0007] The safety element is disposed inside the upper housing and is in contact with the inclined inner surface of the upper housing so that the safety element can move radially when the upper housing is pressed.

[0008] The safety element has a blocking block protruding from one end facing the injection button. The blocking block is arranged radially outward so that when the safety element moves radially along the needle-free injector, the blocking block can move radially outward out of the movement path of the injection button.

[0009] The upper housing and the injection button are elastically connected axially to the needle-free injector, and the safety element and the upper housing are elastically connected radially to the needle-free injector.

[0010] The safety component includes an annular body, which is sleeved on the core shaft sleeve of the needleless injector. A blocking block is disposed on the annular body, and a contact block is also disposed on the annular body. The contact block and the blocking block are respectively disposed on the outer sides of the first and second opposite sides of the annular body. The contact block contacts and matches the inclined surface of the upper outer shell, and the thickness of the blocking block is greater than the thickness of the annular body.

[0011] Optionally, a first spring mounting hole is provided on the outer side of the blocking block, and a first spring is provided in the first spring mounting hole. The safety component is elastically connected to the upper outer shell through the first spring.

[0012] Optionally, an auxiliary block is also provided outside the annular body. The auxiliary block, the contact block, and the blocking block are arranged around the annular body. A limiting groove extending axially is also provided inside the upper outer shell. The auxiliary block extends into the limiting groove, and the width of the limiting groove is greater than or equal to the stroke of the safety component.

[0013] Optionally, two auxiliary blocks are arranged opposite each other, and each auxiliary block is provided with a second spring mounting hole. The second spring mounting hole is oriented in the same direction as the first spring mounting hole. A second spring is provided in the second spring mounting hole, and the auxiliary block is elastically connected to the upper outer shell through the second spring.

[0014] Optionally, the end of the blocking block away from the injection button extends out of the annular body and can be embedded in the kinetic energy component of the needleless injector.

[0015] Optionally, a third spring is fitted onto the injection button, and the third spring is elastically connected to the upper outer shell.

[0016] This utility model also provides a needleless injector, including the above-mentioned safety structure based on the needleless injector.

[0017] The safety structure based on a needle-free injector provided by this utility model includes: an upper shell sleeved around the injection button on the top of the needle-free injector, and a safety component positioned in the trigger direction of the injection button. The safety component is located inside the upper shell and contacts the inclined inner surface of the upper shell, allowing it to move radially when the upper shell is pressed. A contact block and a blocking block are respectively provided on both sides of the annular body of the safety component. The blocking block protrudes towards the injection button and is positioned radially outward. In use, pressing the upper shell drives the safety component to move radially along the needle-free injector through the inclined contact structure of the contact block, moving the blocking block out of the injection button's movement path and releasing the injection button. Further pressing down on the upper shell and the injection button triggers the internal kinetic energy component, resulting in the ejection of the medication. The core structure of the safety structure based on the needleless injector of this utility model can be completely set inside the upper shell, which can reduce the risk of jamming due to external contaminants and improve reliability. The unlocking action is consistent with the pressing action, and the unlocking action precedes the injection action. In the event of accidental triggering of the pressing action, the prior unlocking action can effectively dissipate the pressing kinetic energy, reducing the possibility of subsequent injection actions being accidentally triggered, thereby effectively reducing the risk of accidental injection and improving safety. Attached Figure Description

[0018] Figure 1 This is a schematic cross-sectional view of the needleless injector in an embodiment of the present invention;

[0019] Figure 2 This is a partial structural schematic diagram of the needleless injector in an embodiment of the present utility model;

[0020] Figure 3 This is a schematic diagram of the safety device of the needleless injector in an embodiment of the present invention;

[0021] Figure 4 This is a partial structural diagram of the needleless injector in the unlocked state according to an embodiment of the present invention;

[0022] Figure 5 This is a schematic cross-sectional view of the needleless injector in the embodiment of the present invention when it has absorbed the drug solution.

[0023] The following detailed description, in conjunction with the accompanying drawings, will further illustrate this utility model. Detailed Implementation

[0024] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. Several embodiments of this utility model are shown in the drawings. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this utility model will be more thorough and complete.

[0025] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0027] To address the issue of insufficient reliability in the safety design of existing reusable needle-free injectors, this invention provides a safety structure based on a needle-free injector. The structure includes an upper housing fitted over the injection button on the top of the injector, and a safety element positioned in the trigger direction of the injection button. The safety element is located inside the upper housing and contacts and matches the inclined inner surface of the upper housing, allowing it to move radially when the upper housing is pressed. A blocking block protrudes from the end of the safety element facing the injection button, and the blocking block is positioned radially outward. In use, pressing down the upper casing activates the safety mechanism via the inclined contact structure, which moves the blocking block out of the injection button's path, releasing the button's lock. Continuing to press down on the upper casing and injection button triggers the internal kinetic energy component, enabling liquid injection. The safety mechanism, located within the upper casing, reduces the risk of jamming due to external contaminants, improving reliability. The unlocking action is synchronized with the pressing action, and occurs before the injection action. In case of accidental pressing, the pre-emptive unlocking action effectively dissipates the pressing energy, reducing the likelihood of subsequent injection being accidentally triggered, thus significantly reducing the risk of accidental injection and improving safety.

[0028] This embodiment is applicable to spring-driven needle-free injectors. Spring-driven needle-free injectors require no electricity or gas canisters, are highly reliable, and easy to use. They can be used for home and emergency purposes, such as insulin injections for diabetic patients. They can be used multiple times daily. Please refer to [link / reference]. Figure 1 The diagram shown is a schematic diagram of the main structure of the needleless injector in this embodiment.

[0029] The kinetic energy assembly is enclosed in the lower outer shell 110 and the upper outer shell 120. The kinetic energy assembly includes an outer bushing 131, an inner bushing 132, a first core rod 141, a second core rod 142, a core rod bushing 143, a push block 144, and a button reset spring 145. A fourth spring 1411 (providing kinetic energy) is provided on the outer sleeve of the first core rod 141. The triggering assembly includes a steel ball 151, a steel ball bushing 152, and an injection button 153. The injection assembly includes an injection syringe 161 and a piston 162. The injection syringe 161 is fixedly connected to the outer bushing 131, and the piston 162 is fixedly connected to the first core rod 141.

[0030] The outer bushing 131 and the inner bushing 132 are screwed together. The core rod bushing 143 is fixedly connected to the inner bushing 132. The first core rod 141 and the second core rod 142 are screwed together and fixed, and are disposed in the outer bushing 131, the inner bushing 132 and the core rod bushing 143. The first core rod 141 is limited in the outer bushing 131 and can move with the outer bushing 131 when it moves upward. The push block 144 is sleeved in the core rod bushing 143 and presses against the top of the second core rod 142. The steel ball bushing 152 and the injection button 153 are screwed together and fixed. The button reset spring 145 is disposed between the push block 144 and the injection button 153. The top of the push block 144 is provided with an extension to limit the push block 144 on the core rod bushing 143.

[0031] The first core rod 141 and the second core rod 142 are screwed together, which allows for the selection of different materials for the first core rod 141 and the second core rod 142. For example, since there is more friction between the second core rod 142 and the core rod bushing 143, stainless steel can be selected to improve its wear resistance; the first core rod 141 can be selected from materials such as aluminum alloy to reduce weight.

[0032] The core rod bushing 143 has a through hole, and the side wall of the second core rod 142 has a ball groove. In the locked state, as... Figure 1 As shown, the steel ball bushing 152 is positioned and limited outside the through hole of the core rod bushing 143, and the steel ball 151 is positioned in the through hole of the core rod bushing 143. The steel ball 151 is partially embedded in the steel ball groove provided on the side wall of the second core rod 142, and the second core rod 142 is held in place by the steel ball 151, and fixed relative to the inner bushing 132.

[0033] The outer bushing 131 and inner bushing 132 are fixedly connected to the lower outer shell 110 and the upper outer shell 120 in the circumferential direction, respectively. The outer bushing 131 and the lower outer shell 110 are fixed in the axial direction, while the inner bushing 132 and the upper outer shell 120 are slidably connected in the axial direction, so that the upper outer shell 120 can be pressed down to achieve the unlocking action. The unlocked state is as follows: Figure 4As shown. Furthermore, through a circumferential fixed connection, the outer sleeve 131 and inner sleeve 132 can be rotated by rotating the lower outer shell 110 and the upper outer shell 120. When the outer sleeve 131 and inner sleeve 132 rotate and move away from each other, the piston 162, fixed to the first core rod 141, can be fixed relative to the inner sleeve 132 via the first core rod 141, the second core rod 142, the core rod bushing 143, and the steel ball 151. The injection syringe 161 is fixed to the outer sleeve 131, thereby allowing the piston 162 to be withdrawn relative to the injection syringe 161, achieving the aspiration of the drug solution. After aspirating the drug solution, its overall state is as follows. Figure 5 As shown.

[0034] Before drawing in the liquid medicine, energy is stored by rotating the lower outer shell 110 and the upper outer shell 120 in the opposite direction (clockwise or counterclockwise, opposite to the direction of rotation for drawing in the liquid medicine). This causes a contraction action between the outer liner 131 and the inner liner 132. Figure 1 Using the inner bushing 132 as a reference for direction and the outer bushing 131 as a reference for the fixed component, the outer bushing 131 moves upward, causing the first core rod 141 and the second core rod 142 to move upward until the ball groove of the second core rod 142 moves to the through hole position of the core rod bushing 143. The ball 151 moves inward under the action of the ball bushing 152 and is embedded in the ball groove of the second core rod 142, locking the second core rod 142 relative to the inner bushing 132. The two ends of the fourth spring 1411 abut against the first core rod 141 and the inner bushing 132. As the first core rod 141 moves upward and is locked with the locking of the second core rod 142, the fourth spring 1411 is in a compressed state (completes energy storage).

[0035] After energy storage is complete, piston 162 is fixed to the first core rod 141. The first and second core rods 141 and 142 are locked relative to the inner liner 132. The lower outer shell 110 and upper outer shell 120 are rotated in opposite directions, causing the outer liner 131 and inner liner 132 to move away from each other, allowing piston 162 to be withdrawn relative to syringe 161 to draw up the medication. Pressing the injection button 153 then moves the limiting part of the steel ball bushing 152 away from the position of the steel ball 151. The steel ball 151 moves outward, releasing the limiting position on the second core rod 142. The stored energy of the fourth spring 1411 is released, pushing the first core rod 141 outward from the inner liner 132, which in turn pushes piston 162, spraying out the medication.

[0036] In this embodiment, to facilitate the movement of the steel ball 151, the ends of the steel ball receiving groove on the inner wall of the steel ball bushing 152 and the steel ball groove of the second core rod 142 are arc-shaped, making it easier to push the steel ball 151. Since the steel ball 151 is a sphere, even if the sidewalls of the steel ball receiving groove on the inner wall of the steel ball bushing 152 and the steel ball groove of the second core rod 142 are vertical walls, the steel ball 151 can still be pushed even when the depth of these grooves is less than the radius of the steel ball. The top edge of the second core rod 142 is beveled to push the steel ball 151 outwards.

[0037] Please refer to further details. Figure 2 and Figure 3 In this embodiment, the safety element 170 is located in the triggering direction of the injection button 153. In the locked state, it restricts the downward stroke of the injection button 153, thereby preventing accidental triggering.

[0038] In this embodiment, the safety element 170 is disposed inside the upper housing 120 and sleeved on the core rod bushing 143. The safety element 170 is in contact with the inclined inner surface of the upper housing 120 so that the safety element 170 can move radially when the upper housing 120 is pressed. A blocking block 172 is provided protruding from the end of the safety element 170 facing the injection button 153. The blocking block 172 is arranged radially outward so that when the safety element 170 moves radially along the needle-free injector, the blocking block 172 can move radially outward out of the movement path of the injection button 153 and the steel ball bushing 152, and the steel ball bushing 152 can move smoothly downward, thereby releasing the restriction on the injection button 153 and the steel ball bushing 152. The upper housing 120 and the injection button 153 are elastically connected axially to the needle-free injector, and the safety element 170 and the upper housing 120 are elastically connected radially to the needle-free injector so that they can naturally rebound after being triggered for the next use.

[0039] After the medication is drawn up, during use, the syringe 161 is pressed against the injection site, the upper shell 120 is held and downward force is applied, which will push the safety device 170 to move and unlock through the upper shell 120. If force is continued, the upper shell 120 can drive the injection button 153 to continue to move downward until the limiting part of the steel ball bushing 152 is completely removed from the position of the steel ball 151. The kinetic energy component is activated, and the medication can be sprayed out to achieve injection.

[0040] For ease of installation, the safety component 170 includes an annular body that is fitted onto the core rod sleeve 143 of the needleless injector. A contact block 171 is fixedly disposed on the first side of the annular body, and the contact block 171 contacts and matches the inclined surface of the upper outer shell 120. A blocking block 172 is disposed on the second side of the annular body, with the second side facing opposite to the first side. The thickness of the blocking block 172 is greater than the thickness of the annular body so that the blocking block 172 can effectively perform the limiting function.

[0041] To achieve the rebound of the safety component, in this embodiment, a first spring mounting hole is provided on the outer side of the blocking block 172, and a first spring 175 is provided in the first spring mounting hole. The safety component 170 is elastically connected to the upper outer shell 120 through the first spring 175.

[0042] To ensure the reliability of the safety device, in this embodiment, an auxiliary block 173 is also provided outside the annular body. The auxiliary block 173, contact block 171, and blocking block 172 are arranged around the annular body. A limiting groove (not shown in the figure) extending axially is also provided inside the upper outer shell 120. The auxiliary block 173 extends into the limiting groove, and the width of the limiting groove is greater than or equal to the stroke of the safety device 170, to ensure that the safety device 170 can be effectively unlocked. The limiting groove can position the auxiliary block 173, preventing the safety device 170 from rotating and misaligning during installation, thereby ensuring that the contact block 171 and blocking block 172 of the safety device can be aligned and matched with the corresponding counterpart, ensuring the reliability of the safety device.

[0043] To further improve the rebound reliability of the safety element 170, in this embodiment, two auxiliary blocks 173 are arranged opposite each other. Each auxiliary block 173 has a second spring mounting hole, which faces the same direction as the first spring mounting hole. A second spring (not shown in the figure) is installed in the second spring mounting hole, and the auxiliary block 173 is elastically connected to the upper housing via the second spring. The two second springs also further improve the linearity of the radial movement of the safety element 170, preventing misalignment.

[0044] The end of the blocking block 172 away from the injection button extends into an annular body and can be embedded in the limiting groove on the end face of the inner liner 132 in the needleless injector's kinetic energy component, which can further ensure the linearity of the radial movement of the blocking block 172.

[0045] In order to achieve the rebound of the upper outer shell 120, in this embodiment, the injection button 153 is fitted with a third spring 121 and is elastically connected to the upper outer shell 120 through the third spring 121.

[0046] After injection, the pusher 144 is embedded in the core rod bushing 143 and blocks the steel ball 151 on the outside, so that the steel ball bushing 152 and the injection button 153 are in the pressed state and have a tendency to push the steel ball 151 into the core rod bushing 143. When the upper housing 120 and the injection button 153 are released, the upper housing 120 rebounds and releases the limit on the safety element 170. The safety element 170 has a rebound tendency, but due to the influence of the steel ball bushing 152 in the pressed state, it cannot rebound to reset.

[0047] At this point, energy storage operation is performed. Rotating the upper outer casing 120 and the lower outer casing 110 causes a contraction between the outer bushing 131 and the inner bushing 132. Under the action of the outer bushing 131, the first core rod 141 is pushed upwards, which in turn drives the second core rod 142 upwards until the ball groove of the second core rod 142 moves to the position of the ball 151. The ball 151, under the action of the ball bushing 152, moves inwards and embeds itself in the ball groove of the second core rod 142. A distinct rigid impact sound can be heard at this point, indicating that the operation is complete. Simultaneously, under the action of the button reset spring 145, the injection button 153 and the ball bushing 152 reset. After the injection button 153 and the ball bushing 152 reset, the ball bushing 152 moves away, and the safety element 170 resets under the action of the first spring 175.

[0048] Then the upper outer shell 120 and the lower outer shell 110 can be rotated in the opposite direction to draw in the liquid medicine. This cycle can be repeated to achieve reuse.

[0049] This utility model also provides a needleless injector, including the above-mentioned safety structure based on the needleless injector, wherein the safety element is protected inside the upper housing 120, which can reduce the risk of the safety structure being jammed by external contaminants, thereby improving the reliability of the needleless injector.

[0050] The core structure of the safety structure based on the needleless injector of this utility model can be protected inside the upper shell, which can reduce the risk of jamming due to external contaminants and improve reliability. The unlocking action is consistent with the pressing action, and the unlocking action precedes the injection action. In the event of accidental triggering of the pressing action, the prior unlocking action can effectively dissipate the pressing kinetic energy, reducing the possibility of subsequent injection actions being accidentally triggered, thereby effectively reducing the risk of accidental injection and improving safety.

[0051] Furthermore, in existing side-button unlocking solutions, the force direction of the side unlock button is perpendicular to the force direction of the injection trigger. During the injection pressing action, a continuous side pressing force is required. However, the human hand is flexible, and when gripping the upper shell, it is difficult to fully press down the side button. Moreover, during the injection pressing action, the pressure on the side button is prone to loosening, making it difficult to fully unlock the safety mechanism and affecting the normal triggering of the injection kinetic energy system. In contrast, the unlocking action of this application is consistent with the pressing action, effectively avoiding the problems of the aforementioned side-button unlocking and improving the ease of use of the needle-free injector.

[0052] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0053] The embodiments described above are merely illustrative of several specific implementations of this utility model, and while the descriptions are detailed, they should not be construed as limiting the scope of protection of this utility model. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these modifications and improvements all fall within the scope of protection of this utility model. Therefore, the scope of protection of this utility model patent should be determined by the appended claims.

Claims

1. A safety structure based on a needleless injector, characterized in that, include: An upper housing fitted over the injection button on top of the needle-free injector, and a safety device positioned in the trigger direction of the injection button, wherein, The safety element is disposed inside the upper housing and is in contact with the inclined inner surface of the upper housing so that when the upper housing is pressed, the safety element can move radially along the needleless injector. The safety element has a blocking block protruding from one end facing the injection button. The blocking block is arranged radially outward so that when the safety element moves radially along the needle-free injector, the blocking block can move radially outward out of the movement path of the injection button. The upper housing and the injection button are elastically connected axially to the needle-free injector, and the safety element and the upper housing are elastically connected radially to the needle-free injector. The safety component includes an annular body, which is sleeved on the core shaft sleeve of the needleless injector. A blocking block is disposed on the annular body, and a contact block is also disposed on the annular body. The contact block and the blocking block are respectively disposed on the outer sides of the first and second opposite sides of the annular body. The contact block contacts and matches the inclined surface of the upper outer shell, and the thickness of the blocking block is greater than the thickness of the annular body.

2. The needle-free injector based safety arrangement according to claim 1, characterized in that, The outer side of the blocking block is provided with a first spring mounting hole, and a first spring is provided in the first spring mounting hole. The safety component is elastically connected to the upper outer shell through the first spring.

3. The needle-free injector based safety arrangement according to claim 2, characterized in that, An auxiliary block is also provided outside the annular body. The auxiliary block, the contact block, and the blocking block are arranged around the annular body. A limiting groove extending axially is also provided inside the upper outer shell. The auxiliary block extends into the limiting groove, and the width of the limiting groove is greater than or equal to the stroke of the safety component.

4. The needle-free injector based safety arrangement according to claim 3, characterized in that, Two auxiliary blocks are arranged opposite each other, and each auxiliary block is provided with a second spring mounting hole. The second spring mounting hole is oriented in the same direction as the first spring mounting hole. A second spring is provided in the second spring mounting hole, and the auxiliary block is elastically connected to the upper outer shell through the second spring.

5. The needle-free injector based safety arrangement according to claim 1, characterized in that, The end of the blocking block away from the injection button extends out of the annular body and can be embedded in the kinetic energy component of the needleless injector.

6. The needle-free injector based safety arrangement according to claim 1, characterized in that, The injection button is fitted with a third spring, which is elastically connected to the upper outer shell.

7. A needleless injector characterized by, Including the safety structure based on a needleless injector as described in any one of claims 1 to 6.

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