Pfs mounting fixture and auto-injector

Abstract

The utility model relates to a PFS installation fixing mechanism and automatic injection pen thereof, wherein the PFS installation fixing mechanism, including buffer pad, and compression part, PFS is installed into PFS installation sleeve with buffer pad, the bottom of buffer pad is supported on PFS fixed platform, and the top of the flange of PFS is supported on the bottom of buffer pad, the top of the flange of PFS is equipped with compression part, and the compression part is elastic part, and the top of compression part is limited through the lower part of injection spring sleeve, and the compression part is elastically compressed on the top of flange. Automatic injection pen, including the PFS installation fixing mechanism as described above. The utility model adopts the cooperation of buffer pad and compression part, stably installs the flange of PFS in PFS installation sleeve, and can be adapted to the flange of different sizes, and the adaptive installation is more convenient, and the parts of automatic injection pen need not be redesigned and adjusted.

Description

Technical Field

[0001] This utility model relates to the PFS mounting and fixing mechanism in an automatic injection pen, and to an automatic injection pen using this structure, belonging to the field of medical syringes. Background Technology

[0002] The existing automatic injection pen structure is referenced to the automatic injection pen with Chinese patent publication number CN116392673A, the automatic injection device for pre-filled syringe with Chinese patent publication number CN118477233A, the automatic injection pen with Chinese patent publication number CN119524265A, the automatic injection pen with Chinese patent publication number CN118807033A, and the automatic injection pen with Chinese patent publication number CN113499513A.

[0003] PFS (Prefilled Syringe) refers to the structure and mechanism of an auto-injection pen used for installing and using a PFS.

[0004] The PFS1 is typically positioned using the outer wall of the syringe 11's cylinder, and then fixed using the boss of the flange 12; however, in practical applications, the flange 12 of the PFS1 can be either circular or non-circular, such as... Figure 1 As shown, that is, the small flange 121 and the large flange 122; from Figure 1 As can be seen in the top view comparison below, the large flange 122 can completely accommodate the small flange 121 (the dotted line in the figure shows the outer dimensions of the small flange 121). When designing an automatic injection pen, it is necessary to consider the mounting and fixing mechanism of the PFS to ensure compatibility with PFS of two flange sizes, thereby facilitating installation and improving the applicability of the automatic injection pen. Utility Model Content

[0005] The purpose of this utility model is to provide a PFS mounting and fixing mechanism and its automatic injection pen. By redesigning the PFS mounting and fixing mechanism and using a buffer pad and a clamping component, the flange of the PFS is stably installed in the PFS mounting sleeve. It can also adapt to flanges of different sizes, making installation more convenient and eliminating the need to redesign or adjust the components of the automatic injection pen.

[0006] To achieve the above-mentioned utility model objectives, the first aspect of this utility model provides a PFS mounting and fixing mechanism, located within the PFS mounting sleeve and the injection spring sleeve, including a buffer pad and a clamping component;

[0007] The PFS is installed inside the PFS mounting sleeve with the cushioning pad inside. The bottom surface of the cushioning pad rests against the PFS fixing platform, and the top surface of the cushioning pad supports the bottom surface of the PFS flange.

[0008] The top of the flange of the PFS is provided with a clamping element, which is an elastic element. The top surface of the clamping element is limited by the lower part of the injection spring sleeve, and the clamping element is elastically pressed against the top of the flange.

[0009] As a further improvement of this utility model, the cushioning pad has a through hole;

[0010] A buffer platform is provided outside the through hole, and the size of the buffer platform matches the size of the flange.

[0011] Furthermore, the dimensions of the buffer platform are matched with the dimensions of the small flange;

[0012] A pad is also provided on the outside of the buffer platform, and the size of the pad matches the size of the large flange;

[0013] The cushioning pad has clearance surfaces on both sides.

[0014] Furthermore, the PFS mounting sleeve is provided with clearance holes; the clearance surfaces on both sides of the buffer platform match the clearance holes.

[0015] Furthermore, limiting protrusions are provided on both sides of the clearance hole; the limiting protrusions abut against the clearance surface of the buffer pad.

[0016] Furthermore, the buffer pad has fixed protrusions at both ends;

[0017] The wall of the PFS mounting sleeve has positioning mounting holes, and the fixing protrusions on both sides of the buffer pad are inserted into the positioning mounting holes.

[0018] As a further improvement of this utility model, the bottom of the clamping member has a clamping surface;

[0019] The pressing surface is annular, matching the size of the small flange; the center of the annular pressing surface has a clearance space.

[0020] An elastic body is provided above the pressing surface, and the elastic body is a hollowed-out mechanism;

[0021] The top of the elastomer is provided with a pressure surface;

[0022] The bottom surface of the injection spring sleeve is provided with a pressure surface, which is in contact with the top pressure surface.

[0023] Furthermore, the top of the elastomer extends upward to form a limiting and fixing part, including an outer limiting body and an inner limiting body;

[0024] The bottom outer surface of the injection spring sleeve has a groove for the outer limiting body to be fastened in;

[0025] The inner limiting body is stuck inside the bottom of the injection spring sleeve.

[0026] Furthermore, the elastomer is divided into two halves, with a clearance space between the two halves, which is adapted to the clearance hole in the PFS mounting sleeve.

[0027] A second aspect of this utility model provides an automatic injection pen, including the PFS mounting and fixing mechanism as described above;

[0028] The PFS mounting sleeve is combined with the injection spring sleeve and can be releasably installed inside the injection pen.

[0029] The injection spring sleeve contains a push rod, the bottom of which passes through the clamping element and is inserted into the PFS syringe.

[0030] The PFS mounting and fixing mechanism and its automatic injection pen of this utility model use a buffer pad and a clamping component to stably install the PFS flange inside the PFS mounting sleeve. It can also be adapted to flanges of different sizes, making installation more convenient and eliminating the need to redesign or adjust the components of the automatic injection pen. Attached Figure Description

[0031] Figure 1 This is a comparative diagram of PFS;

[0032] Wherein, 1-PFS (Prefilled Syringe, also known as prefilled syringe, prefilled syringe, or drug-loaded syringe), 11-syringe, 12-flange (or flange); 121-small flange, 122-large flange;

[0033] Figure 2 This describes the application of the PFS mounting and fixing mechanism of this utility model;

[0034] Among them, 52-PFS mounting sleeve, 62-injection spring sleeve;

[0035] Figure 3 This is a standard PFS mounting and fixing structure within the PFS mounting sleeve;

[0036] Figure 4 This is a schematic diagram of the overall structure of the PFS installation and fixing mechanism of this utility model;

[0037] Figure 5 for Figure 4 A magnified view of a portion of the image;

[0038] Among them, 8-buffer pad, 9-clamping component;

[0039] Figure 6 This is a schematic diagram of the overall structure of the buffer pad of this utility model;

[0040] Figure 7 A schematic diagram of the inner structure of the sleeve for PFS installation;

[0041] Figure 8 This is a schematic diagram of the installation of the buffer pad inside the PFS mounting sleeve;

[0042] Figure 9 This is a view of the buffer pad after it has been installed inside the PFS mounting sleeve.

[0043] Figure 10 for Figure 9 Internal structural cross-sectional view of the state;

[0044] Figure 11 This is a schematic diagram of the overall structure of the clamping component of this utility model. Figure 1 ;

[0045] Figure 12 This is a schematic diagram of the overall structure of the clamping component of this utility model. Figure 2 ;

[0046] Figure 13 A schematic diagram of the overall structure combining the clamping component and the injection spring sleeve;

[0047] Figure 14 A schematic diagram of the overall structure combining the small flange PFS with the buffer pad and clamping components;

[0048] Figure 15 A schematic diagram of the overall structure combining the large flange PFS with the buffer pad and clamping components;

[0049] Figure 16 This is a schematic diagram of the installation of the large flange PFS inside the PFS mounting sleeve.

[0050] Figure 17 This is an overall internal sectional view of the PFS mounting and fixing mechanism of this utility model;

[0051] Figure 18 for Figure 17 A magnified view of a portion of the image. Detailed Implementation

[0052] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings.

[0053] This utility model relates to a PFS mounting and fixing mechanism, and an automatic injection pen using the same structure; the specific structure and operating principle of the automatic injection pen can be found in the automatic injection pen published by Chinese Patent Publication No. CN116392673A.

[0054] like Figure 2 As shown, in this utility model, PFS1 is installed and fixed inside PFS mounting sleeve 52, and at the same time, PFS mounting sleeve 52 is closed at the end by injection spring sleeve 62.

[0055] like Figure 3 As shown, a convenient installation structure for PFS1 is as follows: an installation receiving cavity is provided inside the PFS installation sleeve 52, and a PFS fixing platform 523 is provided at the bottom of the installation receiving cavity. Several elastic PFS fixing claws 524 are provided on the wall above the PFS fixing platform 523 of the installation receiving cavity. During installation, the cylinder of the syringe 11 of PFS1 passes through the hole in the middle of the installation receiving cavity inside the PFS installation sleeve 52, and the flange 12 is placed on the PFS fixing platform 523. Then, the PFS fixing claws 524 elastically reset and lock the top of the flange 12, thereby realizing the installation and fixation of PFS1 inside the PFS installation sleeve 52. To improve the reliability during use, a buffer pad 8 is provided under the flange 12. The buffer pad 8 is placed between the flange 12 and the PFS fixing platform 523, which can buffer the impact force released instantly during injection or needle withdrawal and prevent the flange 12 from breaking.

[0056] However, with this structure, if the same PFS mounting sleeve 52 needs to accommodate two different sizes of flanges 12, the PFS fixing claw 524 needs to be lengthened so that it can extend beyond the long side of the larger flange 122 and reach the inner ring of the flange 12. Therefore, the longer PFS fixing claw 524 allows for smooth reset, which requires higher material quality. Furthermore, the PFS fixing claw 524 only performs a mechanical reset; after reset, the distance between the bottom of the PFS fixing claw 524 and the PFS fixing platform 523 is fixed. When the thickness of the flange 12 changes, the PFS fixing claw 524 can only be raised as high as possible to avoid excessive pressure on the flange 12, which would cause the PFS fixing claw 524 to deform inwards under force, affecting the injection of the push rod. However, if the PFS fixing claw 524 cannot apply pressure to the flange 12, the flange 12 cannot fully fit against the buffer pad 8, making the buffering effect of the buffer pad 8 insignificant.

[0057] Accordingly, the PFS mounting and fixing mechanism of this utility model has redesigned the mounting and fixing method of PFS1 within the PFS mounting sleeve 52, such as... Figure 4 , Figure 5 As shown, PFS1 is installed inside PFS mounting sleeve 52 with buffer pad 8 on it. The bottom surface of buffer pad 8 rests on PFS fixing platform 523, and the top surface of buffer pad 8 supports the bottom surface of flange 12 of PFS1. A clamping member 9 is provided on the top of flange 12 of PFS1. The clamping member 9 is an elastic member. The top surface of clamping member 9 is limited by the lower part of injection spring sleeve 62, so that clamping member 9 is elastically pressed on the top of flange 12, and flange 12 is securely fixed inside PFS mounting sleeve 52.

[0058] Cushion pad 8, such as Figure 6As shown, a through hole 81 is provided for the syringe 11 body of PFS1 to pass through; a buffer platform 82 is provided outside the through hole 81, the size of which matches the size of the small flange 121; preferably, a pad platform 83 is also provided outside the buffer platform 82, the size of which matches the size of the large flange 122; preferably, the buffer pad 8 also has relief surfaces 84 on both sides, which are basically flush with the surfaces on both sides of the large flange 122. Preferably, the buffer pad 8 also has fixing protrusions 85 at both ends.

[0059] PFS installation sleeve 52, such as Figure 7 As shown, the inner side has a mounting cavity for PFS1, and the bottom is a PFS fixing platform 523. The mounting cavity has through clearance holes 525 on both sides for the needle removal / hidden needle activation device of the automatic injection pen to pass through for activation. The clearance hole 525 is adapted to the surfaces on both sides of the large flange 122. Furthermore, limiting protrusions 5252 are provided on both sides of the clearance hole 525.

[0060] The buffer pad 8 can be installed into the PFS mounting sleeve 52 first, such as... Figure 8 As shown; the clearance surface 84 of the buffer pad 8 is aligned with the clearance hole 525 of the PFS mounting sleeve 52, without obstructing the clearance hole 525; correspondingly, the limiting protrusion 5252 abuts against the clearance surface 84 of the buffer pad 8 to prevent the buffer pad 8 from deflecting within the PFS mounting sleeve 52, thus obstructing the clearance hole 525. Figure 9 , Figure 10 As shown, the wall of the PFS mounting sleeve 52 is provided with positioning mounting holes 529. The fixing protrusions 85 on both sides of the buffer pad 8 fit into the positioning mounting holes 529, so that the buffer pad 8 can be positioned stably and reliably installed in the PFS mounting sleeve 52. This prevents the buffer pad 8 from deflecting in the PFS mounting sleeve 52 and also prevents the buffer pad 8 from falling out of the PFS mounting sleeve 52.

[0061] Clamping element 9, made of plastic, such as Figure 11 , Figure 12 As shown, it has a pressing surface 91, which is preferably an annular shape, matching the size of the small flange 121 and the size of the inscribed circle of the large flange 122; an elastic body 92 is provided above the pressing surface 91, which is preferably a hollow structure, and elastic deformation is achieved through a fine solid structure; preferably, the elastic body 92 is a two-lobed design, with a clearance space between the two lobes, which is adapted to the orientation and size of the clearance hole 525.

[0062] In this invention, the pressing surface 91 of the pressing member 9 is smaller in size, while the upper fixed end is larger in size. Therefore, the lower part of the elastic body 92 is smaller and the upper part is larger, so that they can be connected.

[0063] The top of the elastic body 92 is provided with a pressing surface 94; further, the top of the elastic body 92 extends upward to form a limiting and fixing part, including an outer limiting body 95 and an inner limiting body 96.

[0064] like Figure 13 As shown, the clamping member 9 is preferably combined with the bottom of the injection spring sleeve 62; wherein, the bottom surface of the injection spring sleeve 62 is provided with a pressure surface 629, which is in contact with the top pressure surface 94. The pressure surface 629 applies downward pressure to the top pressure surface 94, causing the elastic body 92 to undergo appropriate elastic deformation. The bottom outer surface of the injection spring sleeve 62 is preferably provided with a slot for the outer limiting body 95 to be fastened in, while the inner limiting body 96 is locked in the inner side of the bottom of the injection spring sleeve 62. By simultaneously locking the injection spring sleeve 62 from both the outer limiting body 95 and the inner limiting body 96, the orientation between the clamping member 9 and the injection spring sleeve 62 is stabilized, and the top pressure surface 94 is always in contact with the pressure surface 629, preventing the top pressure surface 94 from contracting inward due to the elastic deformation of the elastic body 92 and detaching from the contact with the pressure surface 629.

[0065] like Figure 14 , Figure 15 As shown, the buffer pad 8 can simultaneously accommodate both the small flange 121 and the large flange 122. The small flange 121 can rest on the buffer platform 82 of the buffer pad 8 to receive elastic support. The large flange 122 can rest on the pad platform 83 of the buffer pad 8 to receive appropriate support. If the buffer platform 82 and the pad platform 83 are completely connected together, the elastic deformation of the rubber will be small, resulting in insufficient buffering effect. Therefore, the buffer platform 82 and the pad platform 83 are set separately with a groove in the middle to reduce the size of the elastomer and obtain a better buffering effect.

[0066] like Figure 16 As shown, the buffer pad 8 is installed in place within the PFS mounting sleeve 52, and the PFS1 is installed inside. When the large flange 122 is used, the planes on both sides of the large flange 122 are also abutted by the limiting protrusions 5252 to limit and prevent the protruding parts at both ends of the large flange 122 from obstructing the clearance hole 525. When the small flange 121 is used, the size of the small flange 121 itself is too small to obstruct the clearance hole 525. Then the clamping member 9 is pressed on, and the clamping surface 91 of the clamping member 9 is reliably pressed against the inner area of ​​the flange 12. The middle of the clamping surface 91 is a hole, which is aligned with the inner hole of the syringe 11 of the PFS1, allowing the push rod to pass through and engage with the piston.

[0067] The specific usage of the PFS installation and fixing mechanism of this utility model is as follows: Figure 17 , Figure 18As shown; the buffer pad 8 is installed inside the PFS mounting sleeve 52, and the clamping member 9 is installed below the injection spring sleeve 62; the PFS1 is installed into the buffer pad 8 and the PFS mounting sleeve 52, and then the other parts of the automatic injection pen are installed, and then the clamping member 9 and the injection spring sleeve 62 are installed. When the injection spring sleeve 62 is engaged with the PFS mounting sleeve 52, the pressure surface 629 of the injection spring sleeve 62 applies a certain pressure to the top pressure surface 94 of the clamping member 9, so that the elastomer 92 undergoes appropriate elastic deformation, and then the flange 12 is pressed down by the clamping surface 91, so that the flange 12 is always fixed between the clamping member 9 and the buffer pad 8; the buffer pad 8 and the clamping member 9 provide elastic buffering and limiting in the vertical direction for the flange 12 of the PFS1, ensuring the safe use of the PFS1 in the automatic injection pen.

[0068] The preferred embodiments of this utility model have been described in detail above, but this utility model is not limited to the embodiments described. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of this utility model, and these equivalent modifications or substitutions are all included within the scope defined by the claims of this application.

Claims

1. A PFS mounting and fixing mechanism, characterized in that, A PFS mounting and fixing mechanism is provided, located inside the PFS mounting sleeve and the injection spring sleeve, including a buffer pad and a clamping element; The PFS is installed inside the PFS mounting sleeve with the cushioning pad inside. The bottom surface of the cushioning pad rests against the PFS fixing platform, and the top surface of the cushioning pad supports the bottom surface of the PFS flange. The top of the flange of the PFS is provided with a clamping element, which is an elastic element. The top surface of the clamping element is limited by the lower part of the injection spring sleeve, and the clamping element is elastically pressed against the top of the flange.

2. The PFS installation and fixing mechanism as described in claim 1, characterized in that, The cushioning pad has through holes; A buffer platform is provided outside the through hole, and the size of the buffer platform matches the size of the flange.

3. The PFS installation and fixing mechanism as described in claim 2, characterized in that, The dimensions of the buffer platform are matched with the dimensions of the small flange; A pad is also provided on the outside of the buffer platform, and the size of the pad matches the size of the large flange; The cushioning pad has clearance surfaces on both sides.

4. The PFS installation and fixing mechanism as described in claim 2, characterized in that, The PFS mounting sleeve has a clearance hole; the clearance surfaces on both sides of the buffer platform match the clearance hole.

5. The PFS installation and fixing mechanism as described in claim 4, characterized in that, Limiting protrusions are provided on both sides of the clearance hole; the limiting protrusions abut against the clearance surface of the buffer pad.

6. The PFS installation and fixing mechanism as described in claim 2, characterized in that, The buffer pad has fixed protrusions at both ends; The wall of the PFS mounting sleeve has positioning mounting holes, and the fixing protrusions on both sides of the buffer pad are inserted into the positioning mounting holes.

7. The PFS installation and fixing mechanism as described in claim 1, characterized in that, The bottom of the clamping component has a clamping surface; The pressing surface is annular, matching the size of the small flange; the center of the annular pressing surface has a clearance space. An elastic body is provided above the pressing surface, and the elastic body is a hollowed-out mechanism; The top of the elastomer is provided with a pressure surface; The bottom surface of the injection spring sleeve is provided with a pressure surface, which is in contact with the top pressure surface.

8. The PFS installation and fixing mechanism as described in claim 7, characterized in that, The top of the elastomer extends upward to form a limiting and fixing part, including an outer limiting body and an inner limiting body; The bottom outer surface of the injection spring sleeve has a groove for the outer limiting body to be fastened in; The inner limiting body is stuck inside the bottom of the injection spring sleeve.

9. The PFS installation and fixing mechanism as described in claim 7, characterized in that, The elastomer is divided into two halves, with a clearance space between them, which is adapted to the clearance hole in the PFS mounting sleeve.

10. An automatic injection pen, characterized in that, Includes the PFS mounting and fixing mechanism as described in any one of claims 1-9, wherein the PFS mounting sleeve is combined with the injection spring sleeve and is releasably mounted inside the injection pen; The injection spring sleeve contains a push rod, the bottom of which passes through the clamping element and is inserted into the PFS syringe.

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