A bidirectional shielding structure and injection device

Abstract

The application provides a bidirectional shielding structure and an injection device, and relates to the technical field of injection equipment.The bidirectional shielding structure of the application can realize safe shielding of the upper end of the injection needle during storage and installation and after injection by moving the first shielding sleeve up and down along the mounting seat, so that the upper end of the injection needle can be prevented from being accidentally injured or pricked, and the use safety of the injection needle is effectively improved.Meanwhile, the locking connection between the second shielding sleeve and the mounting seat is released by moving the first shielding sleeve downward, so that the second shielding sleeve is in a free state in the vertical direction.When the lower end of the injection needle is separated from the injection driving structure, the second shielding sleeve can move downward away from the first shielding sleeve, so as to cover and shield the lower end of the injection needle, the lower end of the injection needle can be prevented from being accidentally injured or pricked, and the safety of the injection needle during disassembly and disposal can be effectively improved.

Description

Technical Field

[0001] This invention relates to the field of injection equipment technology, and more specifically, to a bidirectional shielding structure and an injection device. Background Technology

[0002] Insulin therapy is an important means of controlling hyperglycemia, and the use of insulin pen needles, as portable insulin injection devices, is becoming increasingly widespread. In the structure of an insulin pen needle, the injection needle, as the output structure of the insulin pen needle, is generally equipped with a bidirectional needle tip; the upper end is for direct puncture into the skin, and the lower end is for puncturing the drug vial stopper.

[0003] Currently, most insulin pen needles have a top shielding structure. After use, the top of the needle is shielded to avoid the risk of accidental injury or puncture from the sharp tip. However, the bottom of the needle is also sharp. Insulin pen needles are usually disassembled, and during this process, the bottom of the needle is prone to accidental injury or puncture. Summary of the Invention

[0004] The problem solved by this invention is how to simultaneously avoid accidental injury or puncture at both ends of the injection needle.

[0005] To address the above problems, the present invention provides a bidirectional shielding structure, comprising:

[0006] Mounting base, the mounting base being used to mount the injection needle of the injection instrument;

[0007] The first shielding sleeve is a hollow structure with an open top. The first shielding sleeve is slidably connected to the mounting base through the open end of the mounting base. The first shielding sleeve is used to move up and down so that the upper end of the injection needle can extend out of the first shielding sleeve or the first shielding sleeve can cover and shield the upper end of the injection needle.

[0008] The second shielding sleeve is installed inside the mounting base and is through which the injection needle passes. The second shielding sleeve is locked to the mounting base and driven to the first shielding sleeve. When the first shielding sleeve moves downward, the first shielding sleeve drives the second shielding sleeve to release the locking connection with the mounting base. The second shielding sleeve is used to move away from the first shielding sleeve and cover and shield the lower end of the injection needle.

[0009] Compared with the prior art, the beneficial effects of the bidirectional shielding structure of the present invention include: providing a mounting base for mounting the injection needle in the injection device, which can be mounted on an injection drive structure such as an insulin pen through the mounting base, so that the lower end of the injection needle pierces into the drug container of the insulin pen, thereby supplying drug to the injection needle and facilitating the transfer of drug to the skin through the injection needle. Based on this, the mounting base is designed as a hollow structure with an open top. The first shielding sleeve can slide to the mounting base through the open end, thereby sealing and covering the open end of the mounting base. Furthermore, the first shielding sleeve can move up and down along the mounting base. Before the injection needle is installed on the injection drive structure, when the first shielding sleeve is in its initial position, the upper end of the injection needle is located inside the first shielding sleeve, achieving safe shielding of the upper end of the injection needle during storage and installation, preventing accidental injury or puncture. When injection is required, the first shielding sleeve can be moved downwards, allowing the injection needle to pass through the first shielding sleeve and puncture the skin to complete the injection. After injection, the first shielding sleeve can be moved upwards, returning to its initial position to shield the upper end of the injection needle. At this point, the injection needle can be disassembled. The first shielding sleeve effectively prevents accidental injury or puncture of the upper end of the injection needle, significantly improving injection safety. The safety of needle use is ensured. A second shielding sleeve is installed within the mounting base, allowing the injection needle to pass through and preventing interference with needle installation. Initially, the second shielding sleeve is locked to the mounting base but driven by the first shielding sleeve. During injection, the first shielding sleeve moves downwards, releasing the second shielding sleeve from its locking connection with the mounting base. The second shielding sleeve is then in a free state vertically. When the lower end of the injection needle disengages from the injection drive structure, the lower limit of the second shielding sleeve is released, allowing it to move downwards away from the first shielding sleeve, thus covering and shielding the lower end of the injection needle. The injection needle can then be moved and handled via the mounting base. The second shielding sleeve prevents accidental injury or puncture at the lower end of the injection needle, and consequently, prevents accidental injury or puncture at both ends of the injection needle, effectively improving the safety of needle disassembly and handling.

[0010] Optionally, the mounting base is provided with a mounting cylinder, the lower end of the mounting cylinder is open, the second shielding sleeve is slidably installed in the mounting cylinder, the side wall of the mounting cylinder is provided with a slide rail and a limiting port, the slide rail extends along the axial direction of the mounting cylinder, and the limiting port is located on the upper side of the slide rail and communicates with the slide rail;

[0011] The outer wall of the second shielding sleeve is slidably connected to the inner wall of the first shielding sleeve. A sliding block is provided on the outer wall of the second shielding sleeve. The sliding block is used to be placed in the limiting opening. A first inclined surface is provided at the upper end of the sliding block. The upper end of the first inclined surface is closer to the slide rail than the lower end. A guide block is provided on the inner wall of the first shielding sleeve. The guide block is placed in the limiting opening and is used to abut against the first inclined surface.

[0012] Optionally, the lower end of the guide block is provided with a second inclined surface, which is parallel to the first inclined surface and abuts against the first inclined surface.

[0013] Optionally, the mounting cylinder is provided with a mounting post, and a first spring is sleeved on the mounting post. The second shielding sleeve is sleeved on the mounting post. The first spring abuts against the inner top wall of the mounting cylinder and the second shielding sleeve respectively. When the second shielding sleeve is locked to the mounting base, the first spring is in a compressed state.

[0014] Optionally, the second shielding sleeve is provided with a hollow groove, which extends along the axial direction of the second shielding sleeve and penetrates through the upper end of the second shielding sleeve. The hollow groove and the sliding block are arranged sequentially along the circumference of the second shielding sleeve. When the second shielding sleeve passes through the opening end of the mounting cylinder, the opposite side walls of the hollow groove approach each other.

[0015] Optionally, the sliding block has a locking groove on its end face away from the interior of the second shielding sleeve. The locking groove extends circumferentially along the second shielding sleeve and passes through the sliding block. The lower end of the sliding block has a third inclined surface. The lower end of the third inclined surface is closer to the interior of the second shielding sleeve than the upper end and is smoothly connected to the outer wall of the second shielding sleeve. When the second shielding sleeve moves downward, the inner wall of the opening end of the mounting cylinder sequentially presses the third inclined surface and the sliding block and places them in the locking groove.

[0016] Optionally, a limiting ring and a second spring are sequentially provided between the first shielding sleeve and the mounting base. The inner wall of the mounting base is provided with a sliding groove and a limiting groove. The sliding groove extends along the axial direction of the mounting base. The limiting groove is located on one side of the upper end of the sliding groove and communicates with the sliding groove. The lower end of the first shielding sleeve is provided with a fourth inclined surface that passes through the sliding groove circumferentially. The upper end of the fourth inclined surface is closer to the limiting groove than the lower end. A limiting block is provided on the side wall of the limiting ring. The limiting block is used to be placed in the sliding groove and abuts against the fourth inclined surface.

[0017] Optionally, the slide includes a guide groove and a reset groove, both of which extend axially along the mounting base. The reset groove is located between the guide groove and the limiting groove, and its upper and lower ends are respectively connected to the limiting groove and the guide groove. The limiting block is used to be placed in the guide groove.

[0018] Optionally, the upper surface of the limiting block is provided with a fifth inclined surface, which is parallel to the fourth inclined surface and abuts against the fourth inclined surface.

[0019] On the other hand, the present invention also provides an injection device, including an injection needle and the bidirectional shielding structure described above.

[0020] Compared to the prior art, the beneficial effects of the injection device of the present invention are the same as those of the bidirectional shielding structure described above, and will not be repeated here. Attached Figure Description

[0021] Figure 1 This is an internal schematic diagram of the bidirectional shielding structure when the lower end of the injection needle is not shielded in an embodiment of the present invention;

[0022] Figure 2 This is an internal schematic diagram of the bidirectional shielding structure when the lower end of the injection needle is shielded in an embodiment of the present invention;

[0023] Figure 3 This is an exploded view of a portion of the bidirectional shielding structure in an embodiment of the present invention;

[0024] Figure 4 This is a schematic diagram showing the position of the limiting block when the upper end of the injection needle is not shielded in an embodiment of the present invention;

[0025] Figure 5 This is a schematic diagram showing the position of the limiting block when the upper end of the injection needle is shielded in an embodiment of the present invention;

[0026] Figure 6 This is an exploded view of another part of the bidirectional shielding structure in an embodiment of the present invention.

[0027] Explanation of reference numerals in the attached figures:

[0028] 1-Mounting base; 11-Mounting cylinder; 111-Slide rail; 112-Limiting port; 113-Mounting post; 114-First spring; 12-Slide groove; 121-Guide groove; 122-Reset groove; 13-Limiting groove; 2-Injection needle; 3-First shielding sleeve; 31-Guide block; 311-Second inclined surface; 32-Fourth inclined surface; 4-Second shielding sleeve; 41-Sliding block; 411-First inclined surface; 412-Locking groove; 413-Third inclined surface; 42-Hollowed groove; 5-Limiting ring; 51-Limiting block; 511-Fifth inclined surface; 6-Second spring. Detailed Implementation

[0029] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0030] It should be noted that in the XYZ coordinate system provided herein, the positive direction of the X-axis represents the right, and the negative direction of the X-axis represents the left; the positive direction of the Y-axis represents the front, and the negative direction of the Y-axis represents the back; the positive direction of the Z-axis represents the top, and the negative direction of the Z-axis represents the bottom. Furthermore, it should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein.

[0031] On one hand, one embodiment of the present invention provides a bidirectional shielding structure, including: a mounting base 1 for mounting an injection needle 2 of an injection instrument; a first shielding sleeve 3, wherein the mounting base 1 is a hollow structure with an open top, and the first shielding sleeve 3 is slidably connected to the mounting base 1 through the open end of the mounting base 1, and the first shielding sleeve 3 is used to move up and down so that the upper end of the injection needle 2 extends out of the first shielding sleeve 3 or the first shielding sleeve 3 covers and shields the upper end of the injection needle 2; and a second shielding sleeve 4, which is installed inside the mounting base 1 and is passed through by the injection needle 2, the second shielding sleeve 4 is locked to the mounting base 1 and driven to the first shielding sleeve 3, and when the first shielding sleeve 3 moves downward, the first shielding sleeve 3 drives the second shielding sleeve 4 to release the locked connection with the mounting base 1, and the second shielding sleeve 4 is used to move away from the first shielding sleeve 3 and cover and shield the lower end of the injection needle 2.

[0032] It should be noted that, in the embodiments of the present invention, for the injection device and its various structural components, the upper end is the end that is close to the skin when the injection device is used, and the lower end is the end that is far away from the skin when the injection device is used.

[0033] In this embodiment, as Figure 1 As shown, a mounting base 1 is provided for mounting the injection needle 2 in the injection device. The mounting base 1 allows mounting on an injection drive structure such as an insulin pen, so that the lower end of the injection needle 2 pierces into the insulin pen's medication container, thus supplying medication into the injection needle 2 and facilitating the transfer of the medication to the skin injection site. Based on this, as... Figure 4As shown, the mounting base 1 is configured as a hollow structure with an open top. The first shielding sleeve 3 can be slidably connected to the mounting base 1 through the open end of the mounting base 1, thereby sealing and covering the open end of the mounting base 1. Furthermore, the first shielding sleeve 3 can move up and down along the mounting base 1. Before the injection needle 2 is installed in the injection drive structure, when the first shielding sleeve 3 is in its initial position, the upper end of the injection needle 2 is located inside the first shielding sleeve 3, achieving safe shielding of the upper end of the injection needle 2 during storage and installation, avoiding accidental injury or puncture. When injection is required, the first shielding sleeve 3 can be moved downwards, allowing the injection needle 2 to pass through the first shielding sleeve 3 and puncture the skin, thus completing the injection. After injection, the first shielding sleeve 3 can be moved upwards, returning to its initial position to shield the upper end of the injection needle 2. At this point, the injection needle 2 can be disassembled. The first shielding sleeve 3 can prevent accidental injury or puncture of the upper end of the injection needle 2, effectively improving the safety of using the injection needle 2. Simultaneously, as... Figure 1 As shown, a second shielding sleeve 4 is installed inside the mounting base 1. The second shielding sleeve 4 allows the injection needle 2 to pass through, preventing interference with the installation of the injection needle 2. Initially, the second shielding sleeve 4 is locked to the mounting base 1 and driven to the first shielding sleeve 3. During injection, the first shielding sleeve 3 moves downward, which drives the second shielding sleeve 4 to release its locked connection with the mounting base 1. The second shielding sleeve 4 is in a free state in the vertical direction. When the lower end of the injection needle 2 disengages from the injection drive structure, the limiting position below the second shielding sleeve 4 is released, as shown. Figure 2 As shown, the second shielding sleeve 4 can be driven to move downward away from the first shielding sleeve 3, thereby covering the lower end of the shielding injection needle 2. At this time, the injection needle 2 is moved and processed through the mounting base 1. The second shielding sleeve 4 can prevent accidental injury or puncture at the lower end of the injection needle 2, and thus can simultaneously prevent accidental injury or puncture at both ends of the injection needle 2, effectively improving the safety of disassembling and processing the injection needle 2.

[0034] It should be noted that, in the embodiments of the present invention, the second shielding sleeve 4 can be locked by connecting to the inner wall of the mounting base 1 through the connection point. When the first shielding sleeve 3 moves down, the lower end of the first shielding sleeve 3 can cut off the connection point between the second shielding sleeve 4 and the mounting base 1, thereby releasing the locked connection between the second shielding sleeve 4 and the mounting base 1, and thus driving the second shielding sleeve 4 to complete the shielding of the rear end of the injection needle 2.

[0035] Optionally, the mounting base 1 is a hollow structure with an open top. The mounting base 1 is provided with a mounting cylinder 11, and the lower end of the mounting cylinder 11 is open. The second shielding sleeve 4 is slidably installed in the mounting cylinder 11. The side wall of the mounting cylinder 11 is provided with a slide 111 and a limiting port 112. The slide 111 extends along the axial direction of the mounting cylinder 11. The limiting port 112 is located on the upper side of the slide 111 and communicates with the slide 111. The outer wall of the second shielding sleeve 4 is slidably connected to the inner wall of the first shielding sleeve 3. The outer wall of the second shielding sleeve 4 is provided with a sliding block 41, which is used to be placed in the limiting port 112. The upper end of the sliding block 41 is provided with a first inclined surface 411, and the upper end of the first inclined surface 411 is closer to the slide 111 than the lower end. The inner wall of the first shielding sleeve 3 is provided with a guide block 31, which is placed in the limiting port 112 and is used to abut against the first inclined surface 411.

[0036] In this embodiment, as Figure 1 and Figure 3 As shown, a mounting cylinder 11 is provided inside the mounting base 1. The lower end of the mounting cylinder 11 is open, allowing the second shielding sleeve 4 to be slidably installed inside the mounting cylinder 11 through the open end. The outer wall of the second shielding sleeve 4 is slidably connected to the inner wall of the first shielding sleeve 3. A sliding block 41 is provided on the outer wall of the second shielding sleeve 4, and a guide block 31 is provided on the inner wall of the first shielding sleeve 3. When the first shielding sleeve 3 moves downward, the guide block 31 can abut against the sliding block 41, thereby realizing the driving of the second shielding sleeve 4 by the first shielding sleeve 3. Specifically, as shown... Figure 1 As shown, a slide 111 and a limiting port 112 are provided on the side wall of the mounting cylinder 11. The slide 111 extends axially along the mounting cylinder 11. The guide block 31 is located inside the limiting port 112, which is located on one side of the upper end of the slide 111 and connected to the slide 111. The upper end of the sliding block 41 is provided with a first inclined surface 411, with the upper end of the first inclined surface 411 being closer to the slide 111 than the lower end. With this arrangement, when the first shielding sleeve 3 moves downward, the guide block 31 abuts against the first inclined surface 411, allowing the guide block 31 to move along the first inclined surface 411 and provide support for the sliding block 41. A reverse force along the first inclined plane 411, while the sliding block 41 is limited by the bottom wall of the limiting port 112, cancels out the vertical component of the reverse force, while the horizontal component of the reverse force can drive the sliding block 41 to move circumferentially from the limiting port 112 side to the slide rail 111 side. As the first shielding sleeve 3 moves downward, the sliding block 41 enters the slide rail 111 from the limiting port 112. At this time, the locking connection between the second shielding sleeve 4 and the mounting cylinder 11 is released, and the second shielding sleeve 4 is in a free state in the vertical direction. When the lower end of the injection needle 2 disengages from the injection drive structure, as... Figure 2As shown, the second shielding sleeve 4 can be driven to move downward. When the sliding block 41 finally abuts against the bottom wall of the slide 111, the second shielding sleeve 4 covers and shields the lower end of the injection needle 2. At this time, the injection needle 2 can be moved and processed through the mounting seat 1, which can avoid accidental injury or puncture at the lower end of the injection needle 2. In addition, it can also avoid accidental injury or puncture at both ends of the injection needle 2, effectively improving the safety of the disassembly and processing of the injection needle 2.

[0037] Optionally, the lower end of the guide block 31 is provided with a second inclined surface 311, which is parallel to the first inclined surface 411 and abuts against the first inclined surface 411.

[0038] To ensure the stability of the relative movement of the sliding block 41 and the guide block 31, in this embodiment, as follows: Figure 1 and Figure 2 As shown, a second inclined surface 311 is provided on the lower end face of the guide block 31. The second inclined surface 311 is parallel to the first inclined surface 411. After the first shielding sleeve 3 moves downward, the second inclined surface 311 can abut against the first inclined surface 411, thereby generating action and reaction forces along the first inclined surface 411 between the two. The guide block 31 can slide along the first inclined surface 411 through the second inclined surface 311, ensuring the stability of the relative movement of the sliding block 41 and the guide block 31.

[0039] Optionally, the mounting cylinder 11 is provided with a mounting post 113, a first spring 114 is sleeved on the mounting post 113, and a second shielding sleeve 4 is sleeved on the mounting post 113. The first spring 114 abuts against the inner top wall of the mounting cylinder 11 and the second shielding sleeve 4 respectively. When the second shielding sleeve 4 is locked and connected to the mounting base 1, the first spring 114 is in a compressed state.

[0040] To ensure the stability of the downward movement of the second shielding sleeve 4, in this embodiment, as follows: Figures 1 to 3 As shown, an installation post 113 is provided inside the installation cylinder 11, through which the injection needle 2 can be installed. A first spring 114 and a second shielding sleeve 4 are sleeved on the installation post 113. The first spring 114 abuts against the inner top wall of the installation cylinder 11 and the second shielding sleeve 4 respectively. When the second shielding sleeve 4 is locked to the mounting base 1, the first spring 114 is in a compressed state. With this configuration, after the first shielding sleeve 3 moves down and the locking connection between the second shielding sleeve 4 and the mounting base 1 is released, the pressure on the first spring 114 is released, the first spring 114 relaxes, and under the support of the inner top wall of the installation cylinder 11, it drives the second shielding sleeve 4 to move down, thus completing the safety shielding of the lower end of the injection needle 2.

[0041] Optionally, the second shielding sleeve 4 is provided with a hollow groove 42. The hollow groove 42 extends along the axial direction of the second shielding sleeve 4 and passes through the upper end of the second shielding sleeve 4. The hollow groove 42 and the sliding block 41 are arranged sequentially along the circumference of the second shielding sleeve 4. When the second shielding sleeve 4 passes through the opening end of the mounting cylinder 11, the opposite side walls of the hollow groove 42 approach each other.

[0042] In this embodiment, as Figure 1 and Figure 3 As shown, a perforated groove 42 is provided on the second shielding sleeve 4. The perforated groove 42 extends axially along the second shielding sleeve 4, and its upper end extends upward and penetrates the second shielding sleeve 4 axially, thus making the second shielding sleeve 4 a structure that can deform radially. The perforated groove 42 and the sliding block 41 are arranged sequentially along the circumference of the second shielding sleeve 4 to ensure the structural stability of the sliding block 41. When the second shielding sleeve 4 passes through the opening end of the mounting cylinder 11, the radial dimension of the opening end is smaller than the radial dimension of the second shielding sleeve 4. Under the elastic force of the spring 114, the sliding block 41 continues to move down until it abuts against the bottom wall of the slide 111. The opposite side walls of the hollow groove 42 are brought closer to each other by the squeezing force given by the inner wall of the opening end of the mounting cylinder 11. After the first spring 114 is fully relaxed, the radial direction of the second shielding sleeve 4 is squeezed by the inner wall of the opening end of the mounting cylinder 11, which ensures the stability of the second shielding sleeve 4 in shielding the lower end of the injection needle 2 and prevents the lower end of the injection needle 2 from being accidentally touched, thus avoiding safety risks.

[0043] It should be noted that, in this embodiment, as Figure 3 As shown, there are multiple hollow slots 42, which are spaced apart along the circumference of the second shielding sleeve 4.

[0044] Optionally, a locking groove 412 is provided on the end face of the sliding block 41 facing away from the interior of the second shielding sleeve 4. The locking groove 412 extends circumferentially along the second shielding sleeve 4 and passes through the sliding block 41. A third inclined surface 413 is provided at the lower end of the sliding block 41. The lower end of the third inclined surface 413 is closer to the interior of the second shielding sleeve 4 than the upper end and is smoothly connected to the outer wall of the second shielding sleeve 4. When the second shielding sleeve 4 moves downward, the inner wall of the opening end of the mounting cylinder 11 sequentially presses the third inclined surface 413 and the sliding block 41 and places them in the locking groove 412.

[0045] To improve the stability of the second shielding sleeve 4 in shielding the lower end of the injection needle 2, in this embodiment, as follows: Figures 1 to 3As shown, a locking groove 412 is provided on the end face of the sliding block 41 facing away from the interior of the second shielding sleeve 4. The locking groove 412 extends circumferentially along the second shielding sleeve 4 and penetrates the sliding block 41. A third inclined surface 413 is provided at the lower end of the sliding block 41. The lower end of the third inclined surface 413 is closer to the interior of the second shielding sleeve 4 than the upper end and is smoothly connected to the outer wall of the second shielding sleeve 4. With this configuration, when the second shielding sleeve 4 moves downward, the inner wall of the opening end of the mounting cylinder 11 moves upward relative to the second shielding sleeve 4 along the third inclined surface 413. As the thickness of the third inclined surface 413 gradually increases, the inner wall of the opening end of the mounting cylinder 11 can also begin to squeeze the third inclined surface 413. The opposite side walls of the hollow groove 42 approach each other. As the second shielding sleeve 4 continues to move, the inner wall of the opening end of the mounting cylinder 11 eventually enters the locking groove 412 along the third inclined surface 413. The edge of the opening end of the mounting cylinder 11 can limit the second shielding sleeve 4 by abutting against the inner top wall and inner bottom wall of the locking groove 412, thereby improving the stability of the second shielding sleeve 4 in shielding the lower end of the injection needle 2.

[0046] Optionally, a limiting ring 5 and a second spring 6 are sequentially provided between the first shielding sleeve 3 and the mounting base 1. The inner wall of the mounting base 1 is provided with a sliding groove 12 and a limiting groove 13. The sliding groove 12 extends along the axial direction of the mounting base 1. The limiting groove 13 is located on one side of the upper end of the sliding groove 12 and communicates with the sliding groove 12. The lower end of the first shielding sleeve 3 is provided with a fourth inclined surface 32 that passes through the sliding groove 12 in the circumferential direction. The upper end of the fourth inclined surface 32 is closer to the limiting groove 13 than the lower end. A limiting block 51 is provided on the side wall of the limiting ring 5. The limiting block 51 is used to be placed in the sliding groove 12 and abuts against the fourth inclined surface 32.

[0047] In this embodiment, as Figures 4 to 6As shown, a limiting ring 5 and a second spring 6 are sequentially provided between the first shielding sleeve 3 and the mounting base 1. With this arrangement, when the first shielding sleeve 3 moves downward under the pressure of the skin insertion point, the first shielding sleeve 3 compresses the second spring 6 through the limiting ring 5, and the upper end of the injection needle 2 extends to complete the injection. After the injection is completed, the first shielding sleeve 3 disengages from the skin insertion point, the pressure disappears, the second spring 6 relaxes, and drives the first shielding sleeve 3 to move upward and reset through the limiting ring 5, restoring the safe shielding of the upper end of the injection needle 2. Based on this, the inner wall of the mounting base 1 is provided with a sliding groove 12 and a limiting groove 13. The sliding groove 12 extends along the axial direction of the mounting base 1, and the limiting groove 13 is located on one side of the upper end of the sliding groove 12 and communicates with the sliding groove 12. The lower end of the first shielding sleeve 3 is provided with a fourth inclined surface 32 that passes through the sliding groove 12 circumferentially. The upper end of the fourth inclined surface 32 is closer to the limiting groove 13 than the lower end. The side wall of the limiting ring 5 is provided with a limiting block 51. The limiting block 51 is used to be placed in the sliding groove 12 and abuts against the fourth inclined surface 32. With this arrangement, when the first shielding sleeve 3 moves down, the first shielding sleeve 3 gives the limiting block 51 a downward force to drive the limiting block 51 to move down. Under this force, the limiting block 51 moves along the sliding groove 12 and finally abuts against the bottom wall of the sliding groove 12, completing the downward movement of the first shielding sleeve 3. After the injection is completed, the second When spring 6 relaxes, the limiting block 51 is subjected to an upward force. This force drives the limiting block 51 to move along the fourth inclined plane 32. The movement of the limiting block 51 along the fourth inclined plane 32 can be decomposed into movement along the circumference of the mounting base 1 and upward movement. The upward movement of the limiting block 51 drives the limiting ring 5 to move upward, thereby driving the first shielding sleeve 3 to move upward and reset. The movement of the limiting block 51 along the circumference of the mounting base 1 drives the limiting ring 5 to rotate. The direction of rotation is that the sliding groove 12 points to the limiting groove 13. The rotation of the limiting ring 5 finally causes the limiting block 51 to enter the limiting groove 13 through the sliding groove 12. The bottom wall of the limiting groove 13 limits the limiting block 51, so that the first shielding sleeve 3 cannot drive the limiting block 51 to move downward, thereby preventing the first shielding sleeve 3 from being accidentally touched and causing the upper end of the injection needle 2 to protrude from the first shielding sleeve 3, which would create a safety risk.

[0048] Optionally, the slide groove 12 includes a guide groove 121 and a reset groove 122. Both the guide groove 121 and the reset groove 122 extend along the axial direction of the mounting base 1. The reset groove 122 is located between the guide groove 121 and the limiting groove 13. The upper and lower ends of the reset groove 122 are respectively connected to the limiting groove 13 and the guide groove 121. The limiting block 51 is used to be placed in the guide groove 121.

[0049] In this embodiment, as Figures 4 to 6As shown, a guide groove 121 and a reset groove 122, both extending along the axial direction of the mounting base 1, form a sliding groove 12. The reset groove 122 is located between the guide groove 121 and the limiting groove 13. The upper and lower ends of the reset groove 122 are connected to the limiting groove 13 and the guide groove 121, respectively. The limiting block 51 is used to be placed in the guide groove 121. With this configuration, when the limiting block 51 moves downward under the pressure of the first shielding sleeve 3, the limiting block 51 can move downward along the guide groove 121, ensuring the stability of the limiting block 51 during downward movement and preventing the limiting block 51 from causing the limiting ring 5 to rotate. Furthermore, when the limiting block 51 is located at the bottom wall of the guide groove 121, the pressure of the first shielding sleeve 3 acts on the bottom wall of the guide groove 121 through the limiting block 51. The bottom wall of the guide groove 121 provides the limiting block 51 with an upward counterforce. Driven by this counterforce, the limiting block 51 can move along the fourth inclined surface 32, thereby entering the reset groove 122 from the guide groove 121. After the pressure from the shielding sleeve 3 disappears, under the driving action of the second spring 6, the limiting block 51 moves upward along the reset groove 122, thereby driving the limiting ring 5 to move upward, and then driving the first shielding sleeve 3 to reset. When the limiting block 51 moves upward to the connection between the reset groove 122 and the limiting groove 13, the second spring 6 gives the limiting block 51 a driving force to drive the limiting block 51 to move along the fourth inclined surface 32, from the reset groove 122 into the limiting groove 13, thereby limiting the limiting block 51 and preventing the first shielding sleeve 3 from driving the limiting block 51 to move downward, thus preventing the first shielding sleeve 3 from being accidentally touched and causing the upper end of the injection needle 2 to extend out of the first shielding sleeve 3, which would create a safety risk.

[0050] Optionally, the upper surface of the limiting block 51 is provided with a fifth inclined surface 511, which is parallel to the fourth inclined surface 32 and abuts against the fourth inclined surface 32.

[0051] To ensure the stability of the relative movement between the limiting block 51 and the fourth inclined surface 32, in this embodiment, as follows: Figures 4 to 6 As shown, a fifth inclined surface 511 is provided on the upper end face of the limiting block 51. The fifth inclined surface 511 is parallel to the fourth inclined surface 32 and abuts against the fourth inclined surface 32, thereby generating action and reaction forces along the fourth inclined surface 32 between the two. The limiting block 51 can slide along the fourth inclined surface 32 through the fifth inclined surface 511, thus improving the stability of the relative movement of the limiting block 51 and the fourth inclined surface 32.

[0052] On the other hand, one embodiment of the present invention provides an injection device, including an injection needle 2 and the above-described bidirectional shielding structure.

[0053] like Figures 1 to 6 As shown, the technical effect of the injection device in this embodiment is similar to that of the bidirectional shielding structure described above, and will not be repeated here.

[0054] While the present invention has been disclosed above, its scope of protection is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the scope of protection of the present invention.

Claims

1. A bidirectional shielding structure, characterized by, include: Mounting base (1), the mounting base (1) is used to mount the injection needle (2) of the injection device; The first shielding sleeve (3) is a hollow structure with an open top. The first shielding sleeve (3) is slidably connected to the mounting base (1) through the open end of the mounting base (1). The first shielding sleeve (3) is used to move up and down so that the upper end of the injection needle (2) extends out of the first shielding sleeve (3) or the first shielding sleeve (3) covers and shields the upper end of the injection needle (2). The second shielding sleeve (4) is installed inside the mounting base (1) and is for the injection needle (2) to pass through. The second shielding sleeve (4) is locked to the mounting base (1) and driven to the first shielding sleeve (3). When the first shielding sleeve (3) moves downward, the first shielding sleeve (3) drives the second shielding sleeve (4) to release the locked connection with the mounting base (1). The second shielding sleeve (4) is used to move away from the first shielding sleeve (3) and cover and shield the lower end of the injection needle (2). The mounting base (1) is provided with a mounting cylinder (11), the lower end of the mounting cylinder (11) is open, the second shielding sleeve (4) is slidably installed in the mounting cylinder (11), the side wall of the mounting cylinder (11) is provided with a slide (111) and a limiting port (112), the slide (111) extends along the axial direction of the mounting cylinder (11), and the limiting port (112) is located on the upper side of the slide (111) and communicates with the slide (111); The outer wall of the second shielding sleeve (4) is slidably connected to the inner wall of the first shielding sleeve (3). A sliding block (41) is provided on the outer wall of the second shielding sleeve (4). The sliding block (41) is used to be placed in the limiting port (112). The upper end of the sliding block (41) is provided with a first inclined surface (411). The upper end of the first inclined surface (411) is closer to the slide rail (111) than the lower end. A guide block (31) is provided on the inner wall of the first shielding sleeve (3). The guide block (31) is placed in the limiting port (112) and is used to abut against the first inclined surface (411). The lower end of the guide block (31) is provided with a second inclined surface (311), which is parallel to the first inclined surface (411) and abuts against the first inclined surface (411).

2. The bidirectional shielding structure of claim 1, wherein, The mounting cylinder (11) is provided with a mounting post (113), and a first spring (114) is sleeved on the mounting post (113). The second shielding sleeve (4) is sleeved on the mounting post (113). The first spring (114) abuts against the inner top wall of the mounting cylinder (11) and the second shielding sleeve (4) respectively. When the second shielding sleeve (4) is locked to the mounting base (1), the first spring (114) is in a compressed state.

3. The bidirectional shielding structure of claim 2, wherein, The second shielding sleeve (4) is provided with a hollow groove (42). The hollow groove (42) extends along the axial direction of the second shielding sleeve (4) and passes through the upper end of the second shielding sleeve (4). The hollow groove (42) and the sliding block (41) are arranged sequentially along the circumference of the second shielding sleeve (4). When the second shielding sleeve (4) passes through the opening end of the mounting cylinder (11), the opposite side walls of the hollow groove (42) approach each other.

4. The bidirectional shielding structure according to claim 3, characterized in that, The sliding block (41) has a locking groove (412) on its end face away from the interior of the second shielding sleeve (4). The locking groove (412) extends circumferentially along the second shielding sleeve (4) and passes through the sliding block (41). The lower end of the sliding block (41) has a third inclined surface (413). The lower end of the third inclined surface (413) is closer to the interior of the second shielding sleeve (4) than the upper end, and is smoothly connected to the outer wall of the second shielding sleeve (4). When the second shielding sleeve (4) moves downward, the inner wall of the opening end of the mounting cylinder (11) sequentially presses the third inclined surface (413) and the sliding block (41) and places them in the locking groove (412).

5. The bidirectional shielding structure of any one of claims 1 to 4, wherein, A limiting ring (5) and a second spring (6) are sequentially provided between the first shielding sleeve (3) and the mounting base (1). The inner wall of the mounting base (1) is provided with a sliding groove (12) and a limiting groove (13). The sliding groove (12) extends along the axial direction of the mounting base (1). The limiting groove (13) is located on one side of the upper end of the sliding groove (12) and communicates with the sliding groove (12). The lower end of the first shielding sleeve (3) is provided with a fourth inclined surface (32) that passes through the sliding groove (12) circumferentially. The upper end of the fourth inclined surface (32) is closer to the limiting groove (13) than the lower end. A limiting block (51) is provided on the side wall of the limiting ring (5). The limiting block (51) is used to be placed in the sliding groove (12) and abuts against the fourth inclined surface (32).

6. The bidirectional shielding structure of claim 5, wherein, The slide (12) includes a guide groove (121) and a reset groove (122). The guide groove (121) and the reset groove (122) are both extended along the axial direction of the mounting base (1). The reset groove (122) is located between the guide groove (121) and the limiting groove (13). The upper and lower ends of the reset groove (122) are respectively connected to the limiting groove (13) and the guide groove (121). The limiting block (51) is used to be placed in the guide groove (121).

7. The bidirectional shielding structure of claim 6, wherein, The upper surface of the limiting block (51) is provided with a fifth inclined surface (511), which is parallel to the fourth inclined surface (32) and abuts against the fourth inclined surface (32).

8. An injection device, characterized in that It includes an injection needle (2) and a bidirectional shielding structure as described in any one of claims 1 to 7.

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