A PFS safety cap failure prevention and cap removal mechanism suitable for self-medication device

Abstract

The present invention relates to a PFS safety cap anti-failure cap removal mechanism suitable for a self-administration device, comprising a lower pen shell, an injection guide head is arranged at the lower end of the lower pen shell, a safety cap guide assembly is arranged in the injection guide head, a pen cap is connected to the lower end of the lower pen shell, a connection guide sheet extends from the pen cap, and the connection guide sheet contacts the safety cap guide assembly. Thus, through the mutual cooperation of the safety cap guide assembly and the connection guide sheet, a tight combination between the pen cap, the safety cap, and the lower pen shell can be achieved in a storage state, with better air tightness, no abnormal intrusion, and the cleanliness of the injection is ensured. When the user pulls out the pen cap, it only needs to apply normal force to achieve the synchronous pulling out of the pen cap and the needle safety cap. There is no need to pull out or contact the safety cap for a second time, the needle will not be contaminated, and infection caused by improper operation can be avoided.

Description

Technical Field

[0001] The invention relates to a self-administration device, in particular to a pen cap locking and extraction guiding mechanism, and in particular to a PFS safety cap failure prevention cap extraction mechanism suitable for the self-administration device. Background Art

[0002] At present, in order to facilitate users to achieve independent and convenient self-medication treatment, self-medication systems or devices have become more popular. For ease of understanding, from the perspective of the automatic injector to which it belongs, considering the safety of use and to avoid secondary abuse, a one-time function preset is often used.

[0003] The design principles of existing disposable automatic syringes are very complicated, resulting in numerous parts, generally more than 15, so the reliability is low, the assembly is difficult, and the final product cost is too high.

[0004] CN110237366A discloses a medical injection device, including an outer tube and a pen cap, wherein a detachable medicine chamber is arranged at one end of the outer tube, and a replaceable standard cartridge medicine bottle is arranged in the medicine chamber, a fixing sleeve is arranged at one end of the inner part of the outer tube close to the medicine chamber, a push rod seat is arranged axially inside the fixing sleeve, a transmission ring which can mesh with the end of a transmission rod is arranged inside the push rod seat, an axially slidable ratchet ring is sleeved on the outer side of the transmission rod, one end face of the ratchet ring is unidirectionally meshed with the inner part of the outer tube, a first spring is axially arranged at the other end of the ratchet ring, a push rod seat spring which is axially arranged at one end of the push rod seat and is supported by the outer tube, and one end of the push rod passes through the push rod seat and extends into the standard cartridge medicine bottle and is connected to the push block.

[0005] CN109999272A discloses a disposable adjustable injection device for insulin injection, comprising a protective cover, a disposable needle, a refill sleeve, a main body shell, a refill and an adjustment component, wherein a second boss is arranged at one end of the main body shell, a refill sleeve is installed on the outside of the second boss, a thread groove is opened at one end of the refill sleeve, the external thread of the second boss and the thread groove are screwed together, a first boss is arranged at the other end of the refill sleeve, a disposable needle is connected to the outside of the first boss by threads, a steel needle is inserted into the inside of the disposable needle, a refill is installed in the inside of the refill sleeve, a protective cover is sleeved on the outside of the refill sleeve, an adjustment component is arranged at the other end of the main body shell, a fixed sleeve is installed inside the main body shell, and a flange portion protrudes outward at one end of the fixed sleeve.

[0006] CN102264417A discloses an injection device, which comprises: a long shell; a container carrier, which has a medicament container, and a needle is mounted on the medicament container; a puncture device, which comprises a separation sleeve, a preloaded puncture spring device and a puncture holding device, wherein the preloaded puncture spring device can act on the separation sleeve and thereby act on the container carrier to make the container and the needle slide, and the puncture holding device can keep the puncture spring device in a loaded state; an injection device, which comprises a plunger rod, a preloaded injection spring device and an injection holding device, wherein the plunger rod is arranged to act on a stopper in the medicament container, the preloaded injection spring device can act on the plunger rod to cause the stopper to be displaced in the container, and the injection holding device can keep the injection spring device in a loaded state; a retraction device, which comprises a preloaded retraction spring and a retraction holding device, wherein the preloaded retraction spring is arranged to act on the separation sleeve and thereby act on the container carrier, and the retraction holding device is capable of holding the retraction spring in a loaded state; a puncture sequence starting device, which is capable of acting on a puncture trigger device, the puncture trigger device is arranged on the separation sleeve for disconnecting the puncture holding device; an injection trigger device, which is arranged on the separation sleeve and is capable of disconnecting the injection holding device to start the injection sequence when the separation sleeve and the plunger rod move to a specific position; and a retraction trigger device, which is arranged on the separation sleeve and is capable of disconnecting the retraction holding device when the plunger rod has moved to a certain position for starting the needle retraction; characterized in that the device also includes a damping device, the damping device includes a compartment, the compartment contains a certain volume of high viscosity liquid and is partially defined by the outer surface of the plunger rod and the inner surface of the cap, wherein the compartment is arranged with a channel, the liquid is forced to pass through the channel only when the injection sequence is started, so that the volume in the compartment decreases with the movement of the plunger rod in the container during the entire injection sequence, and thereby generates a damping shear force.

[0007] At the same time, in combination with an automatic injector disclosed in 202011110579.9, it comprises: a body (1), a needle shield (2), a push rod (3), a ring (4), an inner tube (5), a release ring (6), a driving elastic member, and a reset elastic member;

[0008] A syringe fixing structure for fixing the syringe (9) is provided in the housing (1), and an opening for the needle (91) to extend is provided at the front end of the housing (1);

[0009] The release ring (6) and the needle shield (2) are slidably arranged in sequence from the rear end to the front end on the inner side of the shell (1); the needle shield (2) can extend from the front end of the shell (1) and can slide toward the rear end relative to the shell (1) and push the release ring (6); the reset elastic member acts on the release ring (6) and drives the release ring (6) to push the needle shield (2) to slide toward the front end of the shell (1); the shell (1) is provided with a needle shield limiting structure for limiting the forward sliding distance of the needle shield (2) relative to the shell (1);

[0010] The push rod (3) is axially slidably arranged inside the housing (1), and the front end of the push rod (3) is used to push the piston (93) in the syringe (9), the driving elastic member acts on the push rod (3) and drives the push rod (3) to slide toward the front end of the syringe (9), and a push rod limiting structure is provided on the outer periphery of the push rod (3);

[0011] The ringing tube (4) is axially slidably sleeved on the outer periphery of the push rod (3), the driving elastic member acts on the ringing tube (4) and drives the ringing tube (4) to slide toward the rear end of the shell (1), the ringing tube (4) is provided with a push rod limiting matching structure, and a ringing tube limiting structure is provided between the ringing tube (4) and the inner tube (5);

[0012] The inner tube (5) is fixed inside the shell (1) and sleeved on the outer circumference of the sound tube (4); the release ring (6) is slidably sleeved on the outer circumference of the inner tube (5); the inner tube (5) is provided with a first clamp (55) that can elastically move in the radial direction; the first clamp (55) deflects outward in the radial direction under the action of its own elastic force;

[0013] The first clamp (55) can be radially deflected inwardly under the limiting action of the inner wall of the release ring (6) and can be mutually clamped and limited with the push rod limiting structure through the push rod limiting matching structure. The ring limiting structure can limit the relative sliding of the ring tube (4) and the inner tube (5) under the support of the outer wall of the push rod (3). The push rod (3) can be detached from the support of the ring tube limiting knot after sliding toward the front end a preset distance.

[0014] The conventional self-administration devices such as automatic syringes have a pen cap at the end that is positioned by a simple interference fit. The following problems may occur during use:

[0015] 1. After pulling out the pen cap, the safety cap needs to be pulled out again for injection, which is not very convenient. At the same time, improper operation may contaminate the needle and cause infection.

[0016] 2. The combination of the pen cap and the pen body is not very stable, there is a certain gap, and it is impossible to ensure that the safety cap is always tightly fastened to the needle when not in use, which is easy to cause contamination invasion.

[0017] In view of the above-mentioned defects, the designer has actively carried out research and innovation in order to create a locking and easy-to-remove cap mechanism suitable for a self-medication device, so that it has more industrial utilization value. Summary of the invention

[0018] In order to solve the above technical problems, the purpose of the present invention is to provide a PFS safety cap anti-failure cap removal mechanism suitable for a self-medication device.

[0019] The invention discloses a PFS safety cap anti-failure cap removal mechanism suitable for a self-administration device, comprising a lower pen shell, wherein: an injection guide head is arranged at the lower end of the lower pen shell, a safety cap guide assembly is arranged inside the injection guide head, a pen cap is connected to the lower end of the lower pen shell, a connecting guide piece extends from the pen cap, and the connecting guide piece contacts the safety cap guide assembly.

[0020] Furthermore, in the above-mentioned PFS safety helmet anti-failure cap removal mechanism suitable for a self-administration device, the safety helmet guiding assembly includes a pressure strip, and a separation slope is provided at the lower end of the pressure strip.

[0021] Furthermore, in the above-mentioned PFS safety cap anti-failure cap removal mechanism suitable for a self-medication device, a pressure protrusion is provided on the pressure strip, and the pressure protrusion is a trapezoidal structure, or the pressure protrusion is an arc-shaped structure.

[0022] Furthermore, in the above-mentioned PFS safety cap anti-failure cap removal mechanism suitable for a self-administration device, a cap removal protrusion is provided on the inner side of the connecting guide piece.

[0023] Furthermore, in the above-mentioned PFS safety cap anti-failure cap removal mechanism suitable for a self-administration device, a needle limiting ring is arranged in the injection guide head.

[0024] Furthermore, in the above-mentioned PFS safety cap anti-failure cap removal mechanism suitable for a self-administration device, an observation window is provided on the lower pen shell, and a contact strip is provided inwardly of the observation window.

[0025] Furthermore, in the above-mentioned PFS safety cap anti-failure cap removal mechanism suitable for a self-administration device, a plurality of positioning holes are distributed on the lower pen shell.

[0026] Furthermore, in the above-mentioned PFS safety cap anti-failure cap removal mechanism suitable for a self-administration device, a deformation groove is provided at the front end of the injection guide head, and the deformation groove is an arc groove.

[0027] Furthermore, in the above-mentioned PFS safety cap anti-failure cap removal mechanism suitable for a self-administration device, a plurality of auxiliary limit strips are distributed on the inner wall of the injection guide head.

[0028] By means of the above scheme, the present invention has at least the following advantages:

[0029] 1. Through the cooperation of the safety cap guide assembly and the connecting guide piece, the pen cap, the safety cap and the lower pen shell can be tightly combined in the storage state, with better air tightness, no abnormal intrusion, and ensure the cleanliness of the injection.

[0030] 2. When the user pulls out the pen cap, he only needs to apply normal force to pull out the pen cap and the safety cap simultaneously. There is no need to pull out or touch the safety cap for the second time, which will not contaminate the needle and avoid infection caused by improper operation.

[0031] 3. The overall structure is simple, and the present lower pen shell, pen cap, etc. can be simply modified to implement, and the implementation cost is low.

[0032] 4. It is easy for users to operate, no special operation training is required, and it has good versatility.

[0033] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the cross-sectional structure of the lower pen shell.

[0035] Figure 2 It is a schematic diagram of the structure of the pen cap.

[0036] Figure 3 It is a schematic diagram of the combination of the pen cap, the safety cap and the lower pen shell.

[0037] Figure 4 This is a schematic diagram of the pen cap being pulled out together with the safety helmet.

[0038] Figure 5 It is a schematic diagram of the combination of the safety cap and the pen cap after the pen cap is pulled out.

[0039] The meanings of the reference numerals in the drawings are as follows.

[0040] 1 Lower pen shell 2 Injection guide head

[0041] 3 pen cap 4 connection guide piece

[0042] 5 pressure strip 6 pressure bump

[0043] 7 cap removal bump 8 needle limit ring

[0044] 9 Observation window 10 Contact strip

[0045] 11 positioning hole 12 deformation groove

[0046] 13 auxiliary limit strip 14 safety helmet DETAILED DESCRIPTION

[0047] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0048] like Figures 1 to 5 A PFS safety cap failure prevention and cap removal mechanism suitable for a self-administration device includes a lower pen shell 1. The difference lies in that: in order to properly position and guide the end of the PFS component, an injection guide head 2 is provided at the lower end of the lower pen shell 1. At the same time, a plurality of cap removal guide components are provided in the injection guide head 2, and a pen cap 3 is connected to the lower end of the lower pen shell 1. A connecting guide piece 4 extends from the pen cap 3. During the preparation period, the connecting guide piece 4 contacts the safety cap guide component. In this way, when the pen cap 3 is removed, the connecting guide piece 4 and the safety cap guide component can exert force on each other, so as to drive the safety cap 14 where the end of the PFS component is located to be separated together.

[0049] In conjunction with a preferred embodiment of the present invention, the helmet guide assembly used includes a pressure strip 5, and the lower end of the pressure strip 5 is provided with a separation slope. In this way, the contact gap caused by the tolerance can be filled by the existence of the pressure strip 5, ensuring that the connection guide piece 4 is in smooth and full contact with the helmet 14. In addition, the present invention is provided with a pressure protrusion 6 on the pressure strip 5, and the pressure protrusion 6 is a trapezoidal structure. Alternatively, for different implementation methods, a pressure protrusion 6 with a circular arc structure can also be used. Thus, during use, the connection guide piece 4 can be further fitted to the helmet 14 through the pressure protrusion 6. Furthermore, the present invention is provided with a cap removal protrusion 7 on the inner side of the connection guide piece 4. In this way, the connection guide piece 4 can be better in full contact with the tail end of the helmet 14, and the cap 3 can drive the helmet 14 to separate synchronously when the cap 3 is pulled out.

[0050] Furthermore, the present invention is provided with a needle limiting ring 8 in the injection guide head 2. In this way, the needle belonging to the PFS component can be limited to ensure that it is perpendicular to the injection surface after being installed in place, so as to facilitate the subsequent firing injection. At the same time, considering the convenience of user use, the present invention is provided with an observation window 9 on the lower pen shell 1, so that the user can know the current injection status during use. Moreover, in order to achieve appropriate limiting of the firing assembly installed subsequently, a contact strip 10 can also be provided inwardly of the observation window 9. In this way, the assembly gap between the firing assembly and the pit of the lower pen shell 1 can be filled, so that the assembly integrity is better.

[0051] In view of the actual implementation, considering the need for subsequent connection and coordination with the upper pen shell and other related components, the present invention has a plurality of positioning holes 11 distributed on the lower pen shell 1. At the same time, in order to facilitate the user to grasp the pen cap 3 and apply pressure to the injection guide head 2 to produce appropriate deformation and increase the friction stress, the present invention has a deformation groove 12 at the front end of the injection guide head 2, and the deformation groove 12 is a circular arc groove.

[0052] Furthermore, the present invention has a plurality of auxiliary limit strips 13 distributed on the inner wall of the injection guide head 2. In this way, after the PFS assembly is assembled, appropriate pressure can be applied to the safety cap 14 and the part in contact with the needle to ensure that the safety cap 14 will not be loosened during transportation or other non-use conditions, thereby improving the overall airtightness, preventing the intrusion of contaminants, and effectively avoiding injection infection.

[0053] The working principle of the present invention is as follows:

[0054] When the lower pen shell 1 and the pen cap 3 are combined, the connecting guide piece 4 on the pen cap 3 is just combined with the cap removal guide assembly located in the injection guide head 2 at the lower end of the lower pen shell 1. Specifically, the outer side of the connecting guide piece 4 fits the cap removal guide assembly, and the inner side of the connecting guide piece 4 fits the safety cap 14 of the PFS assembly. In this way, the cap removal guide assembly, the connecting guide piece 4, and the safety cap 14 achieve a "sandwich"-like fit, which has better airtightness and avoids contamination of the needle. In addition, the cap removal protrusion 7 in the connecting guide piece 4 is in full contact with the tail end of the safety cap 14.

[0055] When the user needs to inject, he applies an inward squeezing force when holding the pen cap 3. During this period, the force is transmitted through the cap removal guide assembly and the connecting guide piece 4. At the same time, since the cap removal protrusion 7 is in full contact with the rear end of the safety cap 14, the user can easily take out the safety cap 14 when removing the pen cap 3, realizing convenient coordinated removal.

[0056] It can be seen from the above textual description and the accompanying drawings that the present invention has the following advantages:

[0057] 1. Through the cooperation of the capping guide assembly and the connecting guide piece, the pen cap, the safety cap and the lower pen shell can be tightly combined in the storage state, with better air tightness, no abnormal intrusion, and ensure the cleanliness of the injection.

[0058] 2. When the user pulls out the pen cap, he only needs to apply normal force to pull out the pen cap and the safety cap simultaneously. There is no need to pull out or touch the safety cap for the second time, which will not contaminate the needle and avoid infection caused by improper operation.

[0059] 3. The overall structure is simple, and the present lower pen shell, pen cap, etc. can be simply modified to implement, and the implementation cost is low.

[0060] 4. It is easy for users to operate, no special operation training is required, and it has good versatility.

[0061] In addition, the indicated orientations or positional relationships described in the present invention are all based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or structure referred to must have a specific orientation or be operated with a specific orientation structure. Therefore, they cannot be understood as limitations on the present invention.

[0062] The terms "primary" and "secondary" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "primary" or "secondary" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "several" is two or more, unless otherwise clearly and specifically defined.

[0063] Likewise, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the feature. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0064] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "setting" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two components or the interaction relationship between two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances. And it can be directly on another component or indirectly on the other component. When a component is referred to as being "connected to" another component, it can be directly connected to the other component or indirectly connected to the other component.

[0065] It should be understood that the orientation or position relationship indicated by terms such as "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0066] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the technical principles of the present invention, and these improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A PFS safety cap failure prevention capping mechanism suitable for a self-medication device, comprising a lower pen shell, characterized in that: The lower end of the lower pen shell is provided with an injection guide head, and a plurality of capping guide components are provided in the injection guide head. The lower end of the lower pen shell is connected with a pen cap, and a connecting guide piece extends from the pen cap, and the connecting guide piece contacts the capping guide component. The capping guide assembly includes a pressure strip, a separation slope is provided at the lower end of the pressure strip, a pressure bump is provided on the pressure strip, the pressure bump is a trapezoidal structure, or the pressure bump is an arc-shaped structure; a capping bump is provided on the inner side of the connecting guide piece; and a plurality of auxiliary limit strips are distributed on the inner wall of the injection guide head.

2. A PFS safety cap failure prevention cap removal mechanism suitable for a self-medication device according to claim 1, characterized in that: A needle limiting ring is arranged inside the injection guide head.

3. A PFS safety cap failure prevention cap removal mechanism suitable for a self-medication device according to claim 1, characterized in that: The lower pen housing is provided with an observation window, and a contact strip is provided inwardly of the observation window.

4. A PFS safety cap failure prevention cap removal mechanism suitable for a self-medication device according to claim 1, characterized in that: A plurality of positioning holes are distributed on the lower pen shell.

5. A PFS safety cap failure prevention cap removal mechanism suitable for a self-medication device according to claim 1, characterized in that: A deformation groove is provided at the front end of the injection guide head, and the deformation groove is an arc groove.

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