Injection needle shielding structure and injection device

Abstract

The application provides an injection needle shielding structure and an injection device, and relates to the technical field of injection devices. The injection needle shielding structure drives a lower sliding sleeve in a mounting sleeve through an insulin pen, so that the lower sliding sleeve moves upward to release the limit of the lower sliding sleeve in the mounting sleeve. When the injection needle is removed from the insulin pen after the completion of liquid injection, the lower sliding sleeve can move downward to cover the lower end of the injection needle, so as to realize the safe shielding of the lower end of the injection needle after injection, avoid the situation that the user is accidentally pricked by the lower end of the injection needle, and improve the safety of the disassembly and use of the injection needle with a sharp lower end on the injection device. Meanwhile, the upper end of the injection needle is safely shielded during storage and installation and after injection through the up-and-down movement of an upper sliding sleeve along the mounting sleeve, the situation that the user is accidentally pricked by the upper end of the injection needle is avoided, and the safety of the disassembly and use of the injection needle with a sharp upper end on the injection device is improved.

Description

Technical Field

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

[0002] When using injection devices such as insulin pen needles, a needle is typically used to provide a delivery channel for the medication from the container to the skin. The two ends of the needle are relatively sharp, allowing them to pierce the medication container and the skin's entry point, respectively, so that the medication enters the needle and is then dispensed to the skin. However, during the insertion and removal of the needle, the sharp ends can easily prick the user, posing a safety hazard. Furthermore, pricks during disassembly can lead to contamination of the medication. Summary of the Invention

[0003] The problem addressed by this invention is how to improve the safety of disassembling and using injection needles with sharp ends on an injection device.

[0004] To address the above problems, the present invention provides an injection needle shielding structure, comprising:

[0005] Mounting sleeve, which is used to mount the injection needle of the injection device and to mount it on the insulin pen of the injection device;

[0006] A sliding sleeve is slidably installed inside the mounting sleeve and through which the injection needle passes. The sliding sleeve is locked to the mounting sleeve. When the mounting sleeve is installed on the insulin pen, the insulin pen drives the sliding sleeve to release the locking connection with the mounting sleeve. After the mounting sleeve is released from the insulin pen, the sliding sleeve moves toward the lower end of the mounting sleeve and covers and shields the lower end of the injection needle.

[0007] An upper sliding sleeve is located at the upper end of the mounting sleeve and is slidably connected to the mounting sleeve. The upper sliding sleeve is used to move up and down so that the upper end of the injection needle extends out of the upper sliding sleeve or the upper sliding sleeve covers and shields the upper end of the injection needle.

[0008] Compared to existing technologies, the beneficial effects of the injection needle shielding structure of the present invention include: A mounting sleeve is provided as the mounting structure for the injection needle of the injection device, allowing the injection needle to pass through and be installed. The mounting sleeve can be fitted onto the insulin pen of the injection device, enabling the lower end of the injection needle to pierce into the insulin pen's medication container, allowing the medication to be output through the injection needle for injection. Furthermore, a sliding sleeve is slidably installed within the mounting sleeve. The sliding sleeve allows the injection needle to pass through, avoiding interference with the installation of the injection needle and the injection of the medication. Simultaneously, the sliding sleeve and the mounting sleeve are locked together. When the mounting sleeve is installed on the insulin pen, the insulin pen can drive the sliding sleeve to release the lock, allowing the sliding sleeve to be in a free state in the vertical direction. When the mounting sleeve is removed from the insulin pen, it can drive the sliding sleeve downwards towards the lower end of the mounting sleeve, thereby covering and shielding the lower end of the injection needle. This prevents the sharp lower end of the injection needle from causing injury to the user during disassembly, thus improving the safety of disassembling and using injection needles with sharp lower ends on the injection device. Additionally, at the upper end of the mounting sleeve... The device is equipped with an upper sliding sleeve that is slidably connected to the mounting sleeve, allowing the upper sliding sleeve to move up and down along the mounting sleeve. When the upper sliding sleeve is in its initial position, the sharp tip of the injection needle is located inside the upper sliding sleeve, providing a safety shield before use. When injection is required, the upper sliding sleeve is brought into contact with the skin insertion site. Under the pressure of the skin insertion site, the upper sliding sleeve moves downward, and the sharp tip of the injection needle extends out of the upper sliding sleeve and pierces into the skin insertion site to complete the injection. After the injection is completed, the upper sliding sleeve is driven to move upward and reset, covering and shielding the sharp tip of the injection needle again, preventing the sharp tip of the injection needle from causing injury to the user during use and disassembly, thereby improving the safety of disassembling and using injection needles with sharp tips on the injection device.

[0009] Optionally, in the moving direction of the upper sliding sleeve, a limiting ring and a first elastic element are sequentially provided between the upper sliding sleeve and the mounting sleeve. The lower end of the upper sliding sleeve is provided with a first inclined surface. A locking block is provided on the outer side wall of the limiting ring. The locking block abuts against the first inclined surface. A locking groove and a moving groove are provided on the inner wall of the mounting sleeve. The moving groove extends along the axial direction of the mounting sleeve. The locking groove is located on the upper side of the moving groove and communicates with the moving groove. The locking block is used to be placed in the moving groove. The first inclined surface passes through the moving groove along the circumference of the mounting sleeve. The upper end of the first inclined surface is closer to the locking groove than the lower end.

[0010] Optionally, the upper sliding sleeve is a hollow structure with an open lower end, and the limiting ring is slidably installed inside the upper sliding sleeve through the open end of the upper sliding sleeve. The upper end face of the locking block is provided with a second inclined surface, which is parallel to the first inclined surface and abuts against the first inclined surface.

[0011] Optionally, the moving groove includes a guide groove and a reset groove, both of which extend along the axial direction of the mounting sleeve. The reset groove is located between the guide groove and the locking groove, and its upper and lower ends are respectively connected to the locking groove and the guide groove. The limiting block is used to be placed in the guide groove.

[0012] Optionally, the mounting sleeve includes a mounting shell and a needle holder. The mounting shell is fitted onto the needle holder. The outer wall of the upper sliding sleeve is slidably connected to the inner wall of the mounting shell. The needle holder is used to mount the injection needle and is mounted on the insulin pen. The needle holder is a hollow structure with an open lower end. The lower sliding sleeve is installed inside the needle holder. The inner wall of the needle holder is provided with a sliding groove and a limiting groove. The sliding groove extends along the axial direction of the needle holder. The limiting groove is located on the upper side of the sliding groove and communicates with the sliding groove. A third inclined surface is provided at the connection between the limiting groove and the sliding groove. The connection between the third inclined surface and the sliding groove is higher than the connection between the third inclined surface and the limiting groove. A limiting block is provided on the upper side wall of the lower sliding sleeve. The limiting block is used to be placed inside the limiting groove. The upper end of the limiting block is used to abut against the third inclined surface.

[0013] Optionally, the limiting block has a fourth inclined surface on the side away from the slide groove, and a fifth inclined surface is provided at the connection between the slide groove and the limiting groove. The lower end of the fifth inclined surface is closer to the slide groove than the upper end. The fourth inclined surface is parallel to the fifth inclined surface. When the limiting block moves down along the slide groove and passes through the connection between the slide groove and the limiting groove, the fourth inclined surface is used to abut against the fifth inclined surface.

[0014] Optionally, the needle holder is provided with a mounting post for through-mounting the injection needle. A second elastic element is sleeved on the mounting post, and a sliding sleeve is sleeved on the mounting post. The upper and lower ends of the second elastic element abut against the inner top wall of the needle holder and the sliding sleeve, respectively. When the limiting block is located in the limiting groove, the second elastic element is in a compressed state.

[0015] Optionally, the inner wall of the needle holder is further provided with a receiving groove, the middle section of the slide groove is connected to the receiving groove, and an elastic rod is provided between the slide groove and the receiving groove. The elastic rod is inclined toward the slide groove and is used to swing back and forth between the slide groove and the receiving groove.

[0016] Optionally, the lower end of the elastic rod is inclined toward the slide groove, and the distance between the lower end of the elastic rod and the side wall of the slide groove away from the receiving groove is less than the width of the limiting block.

[0017] On the other hand, the present invention also provides an injection device, including an injection needle, an insulin pen, and an injection needle shielding structure as described above.

[0018] Compared to the prior art, the beneficial effects of the injection device of the present invention are the same as those of the injection needle shielding structure described above, and will not be repeated here. Attached Figure Description

[0019] Figure 1 This is a cross-sectional schematic diagram of the injection needle shielding structure from one perspective in an embodiment of the present invention;

[0020] Figure 2 This is a cross-sectional schematic diagram of the injection needle shielding structure from another perspective in an embodiment of the present invention;

[0021] Figure 3 This is an exploded view of a portion of the injection needle shielding structure in an embodiment of the present invention;

[0022] Figure 4 This is an exploded view of another part of the injection needle shielding structure in an embodiment of the present invention;

[0023] Figure 5 This is a cross-sectional schematic diagram of the shielding structure of the injection needle after shielding in an embodiment of the present invention.

[0024] Figure 6 This is a cross-sectional schematic diagram of the shielding structure of the injection needle after shielding in an embodiment of the present invention from another perspective.

[0025] Explanation of reference numerals in the attached figures:

[0026] 1-Mounting sleeve; 11-Locking groove; 12-Moving groove; 121-Guide groove; 122-Reset groove; 13-Mounting shell; 14-Needle seat; 141-Slide groove; 1411-Fifth inclined surface; 142-Limiting groove; 143-Third inclined surface; 144-Mounting post; 145-Second elastic element; 146-Accommodation groove; 147-Elastic rod; 2-Injection needle; 3-Sliding sleeve; 31-Limiting block; 311-Fourth inclined surface; 4-Upper sliding sleeve; 41-First inclined surface; 5-Limiting ring; 51-Locking block; 511-Second inclined surface; 6-First elastic element. Detailed Implementation

[0027] 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.

[0028] 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.

[0029] On one hand, one embodiment of the present invention provides an injection needle shielding structure, comprising: a mounting sleeve 1, which is used to mount the injection needle 2 of the injection device and is mounted on the insulin pen of the injection device; a sliding sleeve 3, which is slidably mounted inside the mounting sleeve 1 and allows the injection needle 2 to pass through it, the sliding sleeve 3 being locked to the mounting sleeve 1, and when the mounting sleeve 1 is mounted on the insulin pen, the insulin pen drives the sliding sleeve 3 to release the locking connection with the mounting sleeve 1, and when the mounting sleeve 1 is released from the insulin pen, the sliding sleeve 3 is used to move toward the lower end of the mounting sleeve 1 and cover the lower end of the injection needle 2; and an upper sliding sleeve 4, which is located at the upper end of the mounting sleeve 1 and is slidably connected to the mounting sleeve 1, and is used to move up and down so that the upper end of the injection needle 2 extends out of the upper sliding sleeve 4 or the upper sliding sleeve 4 covers the upper end of the injection needle 2.

[0030] 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.

[0031] In this embodiment, as Figure 1 As shown, the mounting sleeve 1 serves as the mounting structure for the injection needle 2 of the injection device, allowing the injection needle 2 to pass through and be installed. The mounting sleeve 1 can be fitted onto the insulin pen of the injection device, enabling the lower end of the injection needle 2 to puncture the insulin pen's medication container, allowing the medication to be dispensed through the injection needle 2, thus completing the injection. Based on this, as... Figure 4 and Figure 5 As shown, a sliding sleeve 3 is slidably installed inside the mounting sleeve 1. The sliding sleeve 3 allows the injection needle 2 to pass through, avoiding interference with the installation of the injection needle 2 and the injection of the medication. Simultaneously, the sliding sleeve 3 is locked to the mounting sleeve 1. When the mounting sleeve 1 is installed on the insulin pen, the insulin pen can drive the sliding sleeve 3 to release the lock between the sliding sleeve 3 and the mounting sleeve 1, thus allowing the sliding sleeve 3 to be in a free state in the vertical direction. When the mounting sleeve 1 is removed from the insulin pen, as shown... Figure 6As shown, the sliding sleeve 3 can be driven downwards towards the lower end of the mounting sleeve 1, thereby covering and shielding the lower end of the injection needle 2, preventing the sharp lower end of the injection needle 2 from causing injury to the user during disassembly, thus improving the safety of disassembling and using injection needles with sharp lower ends on the injection device; at the same time, as Figures 1 to 3 As shown, an upper sliding sleeve 4 is provided at the upper end of the mounting sleeve 1. The upper sliding sleeve 4 is slidably connected to the mounting sleeve 1, so that the upper sliding sleeve 4 can move up and down along the mounting sleeve 1. When the upper sliding sleeve 4 is in the initial position, the sharp upper end of the injection needle 2 is located inside the upper sliding sleeve 4, which serves as a safety shield before the injection needle 2 is used. When injection is required, the upper sliding sleeve 4 is pressed against the skin insertion point. Under the pressure of the skin insertion point, the upper sliding sleeve 4 moves downward, and the sharp upper end of the injection needle 2 extends out of the upper sliding sleeve 4 and punctures into the skin insertion point to complete the injection. After the injection is completed, the upper sliding sleeve 4 is driven to move upward and reset, covering and shielding the sharp upper end of the injection needle 2 again, so as to prevent the sharp upper end of the injection needle 2 from causing injury to the user during use and disassembly, thereby improving the safety of disassembly and use of the injection needle with a sharp upper end on the injection device.

[0032] It should be noted that in this embodiment, the sliding sleeve 3 can be connected to the inner wall of the mounting sleeve 1 by a point connection to ensure the stability of the sliding sleeve 3 when it is in the initial position. When the insulin pen drives the sliding sleeve 3 to move upward, the sliding sleeve 3 is disconnected from the mounting sleeve 1 by the driving force of the insulin pen. Finally, after the mounting sleeve 1 is removed from the insulin pen, the sliding sleeve 3 moves downward to shield the lower end of the injection needle 2.

[0033] Optionally, in the moving direction of the upper sliding sleeve 4, a limiting ring 5 and a first elastic element 6 are sequentially provided between the upper sliding sleeve 4 and the mounting sleeve 1. The lower end of the upper sliding sleeve 4 is provided with a first inclined surface 41. A locking block 51 is provided on the outer side wall of the limiting ring 5. The locking block 51 abuts against the first inclined surface 41. The inner wall of the mounting sleeve 1 is provided with a locking groove 11 and a moving groove 12. The moving groove 12 extends along the axial direction of the mounting sleeve 1. The locking groove 11 is located on the upper side of the moving groove 12 and communicates with the moving groove 12. The locking block 51 is used to be placed in the moving groove 12. The first inclined surface 41 passes through the moving groove 12 along the circumference of the mounting sleeve 1. The upper end of the first inclined surface 41 is closer to the locking groove 11 than the lower end.

[0034] In this embodiment, as Figure 1 and Figure 3As shown, in the moving direction of the upper sliding sleeve 4, i.e., the up-down direction, a limiting ring 5 and a first elastic element 6 are sequentially provided between the upper sliding sleeve 4 and the mounting sleeve 1. With this arrangement, when the upper sliding sleeve 4 moves downward under the pressure of the skin insertion point, the upper sliding sleeve 4 squeezes the first elastic element 6 through the limiting ring 5, and the first elastic element 6 is compressed. After the injection is completed, the pressure on the upper sliding sleeve 4 disappears, the first elastic element 6 relaxes, and under the support of the mounting sleeve 1, the upper sliding sleeve 4 is driven to move upward and reset through the limiting ring 5, thus completing the shielding of the sharp upper end of the injection needle 2. Moreover, the elastic support force of the first elastic element 6 can support the upper sliding sleeve 4 to remain in the initial position, preventing the user from accidentally touching the upper sliding sleeve 4 and causing the sharp upper end of the injection needle 2 to be exposed, thus creating a safety risk. Based on this, the lower end face of the upper sliding sleeve 4 is provided with a first inclined surface, the outer side wall of the limiting ring 5 is provided with a locking block, the locking block 51 can abut against the first inclined surface, and the inner wall of the mounting sleeve 1 is provided with a locking groove 11 and a moving groove 12. The moving groove 12 extends along the axial direction of the mounting sleeve 1, the locking groove 11 is located on the upper side of the moving groove 12 and communicates with the moving groove 12. The first inclined surface 41 passes through the moving groove 12 along the circumference of the mounting sleeve 1, and the upper end of the first inclined surface 41 is closer to the locking groove 11 than the lower end. When the upper sliding sleeve 4 is in the initial position, the locking block 51 is placed in the moving groove 12. With this configuration, when the upper sliding sleeve 4 is subjected to pressure and moves downward, it can drive the locking block 51, which abuts against the first inclined surface 41 of the upper sliding sleeve 4, to move downward. The locking block 51 moves downward along the moving groove 12, thereby driving the limiting ring 5 to move downward, realizing the compression of the first elastic element 6. After injection, the first elastic element 6 relaxes, driving the limiting ring 5 to move upward. The upward movement of the limiting ring 5 drives the locking block 51 to move upward synchronously. The locking block 51 abuts against the first inclined surface 41 and can move along the first inclined surface 41, driving the limiting ring 5 to rotate. The direction of rotation is from the moving groove 12 along the circumference of the mounting sleeve 1 to the locking groove 11. At this time, the movement of the locking block 51 can be divided into upward movement and circumferential movement along the mounting sleeve 1. The upward movement can push the upper sliding sleeve 4 to move upward and reset, completing the coverage and shielding of the sharp upper end of the injection needle 2. The locking block 51 moves along the circumference of the mounting sleeve 1, allowing the locking block 51 to enter the locking groove 11 from the moving groove 12. The bottom wall of the locking groove 11 limits the lower part of the locking block 51. The first inclined surface 41 and the side wall of the locking groove 11 cooperate to limit the horizontal direction of the locking block 51. In this way, if the upper sliding sleeve 4 is subjected to pressure again, since the locking block 51 cannot move downward or along the circumference of the mounting sleeve 1, the upper sliding sleeve 4 cannot move downward either, thus locking the position of the upper sliding sleeve 4 and further preventing the user from accidentally touching the upper sliding sleeve 4 and causing the sharp upper end of the injection needle 2 to be exposed, which would pose a safety risk.

[0035] It should be noted that in this embodiment, the first elastic element 6 is a spring.

[0036] Optionally, the upper sliding sleeve 4 is a hollow structure with an opening at the lower end. The limiting ring 5 is slidably installed inside the upper sliding sleeve 4 through the open end of the upper sliding sleeve 4. The upper end surface of the locking block 51 is provided with a second inclined surface 511, which is parallel to the first inclined surface 41 and abuts against the first inclined surface 41.

[0037] In this embodiment, as Figures 1 to 3 As shown, the upper sliding sleeve 4 is configured as a hollow structure with an open lower end. The limiting ring 5 can be slidably installed inside the upper sliding sleeve 4 through the open end of the upper sliding sleeve 4. With this configuration, after the limiting ring 5 is pushed by the expansion of the first elastic element 6, due to the presence of the first inclined surface 41 that abuts against the locking block 51, the limiting ring 5 can rotate and move upward relative to the upper sliding sleeve 4. The up-and-down movement of the limiting ring 5 inside the upper sliding sleeve 4 can ensure the stability of the rotation of the limiting ring 5, avoid interference of the upper sliding sleeve 4 with the rotation of the limiting ring 5, and ensure the stability of the locking block 51 entering the locking groove 11 from the moving groove 12. On this basis, a second inclined surface 511 is provided on the upper end surface of the locking block 51. The second inclined surface 511 is parallel to the first inclined surface 41. The second inclined surface 511 can abut against the first inclined surface 41, increasing the contact area between the locking block 51 and the first inclined surface 41. The first inclined surface 41 can also slide relative to the second inclined surface 511, improving the stability of the locking block 51 moving along the first inclined surface 41.

[0038] Optionally, the moving 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 sleeve 1. The reset groove 122 is located between the guide groove 121 and the locking groove 11. The upper and lower ends of the reset groove 122 are respectively connected to the locking groove 11 and the guide groove 121. The locking block 51 is used to be placed in the guide groove 121.

[0039] In this embodiment, as Figures 1 to 3As shown, in this embodiment, a moving groove 12 is formed by a guide groove 121 and a reset groove 122, both extending axially along the mounting sleeve 1. The reset groove 122 is located between the guide groove 121 and the locking groove 11, and its upper and lower ends are connected to the locking groove 11 and the guide groove 121, respectively. The locking block 51 is placed inside the guide groove 121. This configuration ensures that when the locking block 51 moves downward under the pressure of the upper sliding sleeve 4, it can move downward along the guide groove 121, guaranteeing the stability of the locking block 51 during downward movement and preventing the locking block 51 from causing the limiting ring 5 to rotate. Furthermore, when the locking block 51 is located at the bottom wall of the guide groove 121, the pressure of the upper sliding sleeve 4 acts on the bottom wall of the guide groove 121 through the locking block 51. The bottom wall of the guide groove 121 provides the locking block 51 with an upward counterforce. Driven by this counterforce, the locking block 51 can move along the first inclined surface 41, thereby entering the reset groove 122 from the guide groove 121. After the pressure from the upper sliding sleeve 4 disappears, under the driving action of the first elastic element 6, the locking block 51 moves upward along the reset groove 122, thereby driving the limiting ring 5 to move upward, and then driving the upper sliding sleeve 4 to reset. When the locking block 51 moves upward to the connection between the reset groove 122 and the locking groove 11, the first elastic element 6 gives the locking block 51 a driving force to drive the locking block 51 to move along the first inclined surface 41, from the reset groove 122 into the locking groove 11, thereby limiting the locking block 51 and preventing the upper sliding sleeve 4 from driving the locking block 51 to move downward, thus preventing the upper sliding sleeve 4 from being accidentally touched and causing the upper end of the injection needle 2 to extend out of the upper sliding sleeve 4, which would create a safety risk.

[0040] Optionally, the mounting sleeve 1 includes a mounting shell 13 and a needle holder 14. The mounting shell 13 is fitted onto the needle holder 14. The outer wall of the upper sliding sleeve 4 is slidably connected to the inner wall of the mounting shell 13. The needle holder 14 is used to mount the injection needle 2 and is mounted on the insulin pen. The needle holder 14 is a hollow structure with an open lower end. The lower sliding sleeve 3 is installed inside the needle holder 14. The inner wall of the needle holder 14 is provided with a sliding groove 141 and a limiting groove 142. The sliding groove 141 extends axially along the needle holder 14. The limiting groove 142 is located on the upper side of the sliding groove 141 and is connected to the sliding groove 141. A third inclined surface 143 is provided at the connection between the limiting groove 142 and the sliding groove 141. The connection between the third inclined surface 143 and the sliding groove 141 is higher than the connection between the third inclined surface 143 and the limiting groove 142. A limiting block 31 is provided on the upper side wall of the sliding sleeve 3. The limiting block 31 is used to be placed in the limiting groove 142. The upper end of the limiting block 31 is used to abut against the third inclined surface 143.

[0041] In this embodiment, as Figures 4 to 6As shown, an mounting sleeve 1 is formed by a mounting shell 13 and a needle holder 14. The mounting shell 13 is fitted onto the needle holder 14, and the outer wall of the upper sliding sleeve 4 is slidably connected to the inner wall of the mounting shell 13. The needle holder 14 is used to mount the injection needle 2 and is installed on the insulin pen. The needle holder 14 ensures the stable installation of the injection needle 2, and the mounting shell 13 ensures the stability of the upper sliding sleeve 4's vertical movement. Furthermore, the needle holder 14 is designed as a hollow structure with an open lower end. The lower sliding sleeve 3 can be slidably installed inside the needle holder 14 through the open end. A limiting groove 142 is provided on the inner wall of the needle holder 14, and a limiting block 31 is provided on the side wall of the lower sliding sleeve 3. When the lower sliding sleeve 3 is in its initial position, the limiting block 31 is located within the limiting groove 142, which limits the limiting block 31, preventing it from moving vertically and ensuring the stability of the lower sliding sleeve 3 in its initial position. Additionally, a sliding groove 141 is also provided on the inner wall of the needle holder 14. Extending axially along the needle holder 14, a limiting groove 142 is located on one side of the upper end of the sliding groove 141 and communicates with the sliding groove 141 through a third inclined surface 143. The end of the third inclined surface 143 connected to the limiting groove 142 is higher than the end of the third inclined surface 143 connected to the sliding groove 141. The limiting block 31 is located below the third inclined surface 143. With this configuration, when the needle holder 14 is installed on the insulin pen for injection, the lower end of the sliding sleeve 3 inside the needle holder 14 first abuts against the insulin pen, and the lower end of the injection needle 2 punctures and inserts the insulin. As the length of the injection needle 2 inserted into the pre-filled vial increases, the sliding sleeve 3 moves upward under the thrust of the insulin pen. This upward movement of the sliding sleeve 3 causes the limiting block 31 to move upward as well. The limiting block 31 is located below the third inclined surface 143. As the limiting block 31 moves upward and abuts against the third inclined surface 143, the sliding sleeve 3 continues to move upward, causing the limiting block 31 to move along the third inclined surface 143, thus rotating the sliding sleeve 3 circumferentially along the needle holder 14. After the needle holder 14 is installed in the insulin pen, the limiting block 31 finally exits the limiting groove 142. The insulin pen is inserted into the groove 141 and kept stable vertically by the limits set by the insulin pen and the top wall of the groove 141. At this point, the insulin pen can normally drive the medication through the injection needle 2 to complete the injection. After the medication is injected, the injection needle 2 needs to be removed from the insulin pen. The insulin pen separates from the lower sliding sleeve 3, and the lower limit on the lower sliding sleeve 3 disappears. At this point, the limiting block 31 can be driven to move downwards along the groove 141, causing the lower sliding sleeve 3 to move downwards and gradually cover the lower end of the injection needle 2. When the injection needle 2 is completely removed from the insulin pen, as... Figure 3 As shown, the limiting block 31 also moves downward to abut against the bottom wall of the slide groove 141, and the sliding sleeve 3 moves down to the limit position and completely covers the lower end of the shielding injection needle 2, so as to avoid the user accidentally touching the lower end of the injection needle 2 and being punctured, thereby avoiding the safety risks that exist when the lower end of the injection needle is disassembled.

[0042] It should be noted that, in this embodiment, as Figures 4 to 6 As shown, in order to ensure the stability of the sliding sleeve 3 during the upward movement, a boss is provided on the side wall of the sliding sleeve 3. A first guide slope is provided on the boss, and a downward-opening placement groove is provided on the edge of the opening end of the needle seat 14. A second guide slope is provided on the inner top wall of the placement groove. The first guide slope and the second guide slope are both parallel to the extended surface of the third slope 143 extending circumferentially along the needle seat 14. When the limiting block 31 is located in the limiting groove 142, the boss is located below the needle seat 14. When the limiting block 31 enters the sliding groove 141 from the limiting groove 142, the boss is placed in the placement groove, and the first guide slope and the second guide slope abut against each other. With this configuration, when the sliding sleeve 3 moves upward under the thrust of the insulin pen, the boss will move upward with the sliding sleeve 3 and approach the placement groove. The limiting block 31 will also move along the third inclined surface 143 at the same time as the sliding sleeve 3 moves upward, thereby driving the sliding sleeve 3 to rotate. The rotation of the sliding sleeve 3 will cause the boss to move along the circumference of the sliding sleeve 3, so that the upper end of the first guide inclined surface on the boss contacts and abuts with the lower end of the second guide inclined surface of the placement groove. As the sliding sleeve 3 rotates, the contact area between the first guide inclined surface and the second guide inclined surface increases, and the boss can enter the placement groove along the second guide inclined surface, ensuring the stability of the sliding sleeve 3 when it moves upward and rotates. After the limiting block 31 enters the sliding groove 141 through the limiting groove 142, the sliding sleeve 3 stops moving upward, and the boss is placed in the placement groove, with the first guide inclined surface and the second guide inclined surface abutting against each other. In addition, the bottom wall of the boss is flush with the bottom wall of the sliding sleeve 3. When the sliding sleeve 3 comes into contact with the insulin pen, the boss also comes into contact with the insulin pen, which increases the overall contact area between the sliding sleeve 3 and the insulin pen when it moves, and improves the stability of the upward movement.

[0043] Optionally, the limiting block 31 has a fourth inclined surface 311 on the side away from the slide groove 141, and a fifth inclined surface 1411 is provided at the connection between the slide groove 141 and the limiting groove 142. The lower end of the fifth inclined surface 1411 is closer to the slide groove 141 than the upper end. The fourth inclined surface 311 is parallel to the fifth inclined surface 1411. When the limiting block 31 moves down along the slide groove 141 and passes through the connection between the slide groove 141 and the limiting groove 142, the fourth inclined surface 311 is used to abut against the fifth inclined surface 1411.

[0044] To prevent the limiting block 31 from entering the limiting groove 142 when it moves downward, in this embodiment, as follows: Figures 4 to 6As shown, a fourth inclined surface 311 is provided on the side of the limiting block 31 away from the slide groove 141, and a fifth inclined surface 1411 is provided at the connection between the slide groove 141 and the limiting groove 142. The lower end of the fifth inclined surface 1411 is closer to the slide groove 141 than the upper end. The fourth inclined surface 311 is parallel to the fifth inclined surface 1411. When the limiting block 31 moves down along the slide groove 141 and passes through the connection between the slide groove 141 and the limiting groove 142, the fourth inclined surface 311 is used to abut against the fifth inclined surface 1411. With this configuration, when the sliding sleeve 3 moves downward, the limiting block 31 moves downward along the sliding groove 141. When it passes the connection between the sliding groove 141 and the limiting groove 142, the fourth inclined surface 311 abuts against the fifth inclined surface 1411. The downward force on the limiting block 31 acts on the fifth inclined surface 1411 and is divided into a component force along the fifth inclined surface 1411 and a component force perpendicular to the fifth inclined surface 1411. The component force along the fifth inclined surface 1411 is inclined downward from the limiting groove 142 and points towards the sliding groove 141. Under the action of this component force, the limiting block 31 maintains stable movement within the sliding groove 141 and will not enter the limiting groove 142. Moreover, the fourth inclined surface 311 can slide relative to the fifth inclined surface 1411 to ensure the stability of the limiting block 31 moving along the fifth inclined surface 1411.

[0045] It should be noted that, in this embodiment, as Figures 4 to 6 As shown, a transition groove extending axially is also provided on the inner wall of the needle holder 14. The transition groove is located above and communicates with the slide groove 141. When the needle holder 14 is installed on the insulin pen, the limiting block 31 is located in the transition groove. With this configuration, when the sliding sleeve 3 is pushed upward and drives the limiting block 31 from the limiting groove 142 into the slide groove 141, the sliding sleeve 3 continues to move upward so that the limiting block 31 enters the transition groove. The transition groove extends axially along the needle holder 14. When the needle holder 14 is removed from the insulin pen, the opposite side walls of the transition groove can provide a limit for the limiting block 31, so that the limiting block 31 maintains vertical downward movement, provides a certain initial velocity, and thus stably enters the slide groove 141. This further avoids the downward movement of the limiting block 31 from deviating, which would cause the sliding sleeve 3 to fail to completely cover the tail end of the injection needle 2.

[0046] Optionally, the needle holder 14 is provided with a mounting post 144 for through-mounting the injection needle 2. A second elastic element 145 is sleeved on the mounting post 144, and a sliding sleeve 3 is sleeved on the mounting post 144. The upper and lower ends of the second elastic element 145 abut against the inner top wall of the needle holder 14 and the sliding sleeve 3, respectively. When the limiting block 31 is located in the limiting groove 142, the second elastic element 145 is in a compressed state.

[0047] To improve the stability of the sliding sleeve 3 when covering and shielding the tail end of the injection needle 2, in this embodiment, as follows: Figure 4 and Figure 6As shown, a mounting post 144 is provided inside the needle holder 14. The mounting post 144 is located on the inner top wall of the needle holder 14 and allows the injection needle 2 to pass through and be installed. The sliding sleeve 3 can be fitted onto the mounting post 144 to ensure the installation stability of the injection needle 2 and the sliding sleeve 3. On this basis, a second elastic element 145 is provided between the inner top wall of the needle holder 14 and the sliding sleeve 3. The second elastic element 145 can be fitted onto the mounting post 144 to improve the installation stability of the second elastic element 145. The mounting post 144 can also guide the extension and retraction of the second elastic element 145. At the same time, when the limiting block 31 is located in the limiting groove 142, that is, when the sliding sleeve 3 is in the initial position, the second elastic element 145 is... In the compressed state, when the needle holder 14 is installed on the insulin pen, that is, when the tail end of the injection needle 2 punctures into the pre-filled vial of the insulin pen, the insulin pen abuts against the lower end of the sliding sleeve 3, driving the sliding sleeve 3 to move upward, and the second elastic element 145 is further compressed. At the same time, the limiting block 31 enters the sliding groove 141 from the limiting groove 142. After the injection is completed, the injection needle 2 is pulled out from the insulin pen, the pressure on the second elastic element 145 disappears, and the second elastic element 145 relaxes. Due to the supporting effect of the inner top wall of the needle holder 14, the second elastic element 145 provides elastic driving force to the sliding sleeve 3, driving the sliding sleeve 3 to move downward to cover and shield the tail end of the injection needle 2. In addition, after the sliding sleeve 3 covers the tail end of the shielding injection needle 2, the second elastic element 145 can also be in a compressed state, continuously providing downward pressure to the sliding sleeve 3, preventing the user from accidentally touching the sliding sleeve 3 and giving it an upward thrust that would expose the tail end of the injection needle 2 and cause accidental puncture, thereby further avoiding the safety risks that exist when disassembling the tail end of the injection needle.

[0048] Optionally, the inner wall of the needle holder 14 is also provided with a receiving groove 146, the middle section of the slide groove 141 is connected to the receiving groove 146, and an elastic rod 147 is provided between the slide groove 141 and the receiving groove 146. The elastic rod 147 is inclined toward the slide groove 141 and is used to swing back and forth between the slide groove 141 and the receiving groove 146.

[0049] In this embodiment, as Figures 4 to 6As shown, a receiving groove 146 is provided on the inner wall of the needle holder 14. The receiving groove 146 is located below the limiting groove 142. An elastic rod 147 is provided between the sliding groove 141 and the receiving groove 146. The elastic rod 147 is inclined towards the sliding groove 141 and is used to swing back and forth between the sliding groove 141 and the receiving groove 146. With this arrangement, when the limiting block 31 moves downward along the sliding groove 141, because the elastic rod 147 is inclined towards the sliding groove 141, the limiting block 31 will press one side of the elastic rod 147 towards the receiving groove 146, so that the elastic rod 147 swings towards the receiving groove 146, and the limiting block 31 can continue to move downward. After the limiting block 31 passes, the elastic rod... When the compressive force on 147 disappears, the elastic rod 147 returns to its original position. At this time, if the sliding sleeve 3 is subjected to an upward pushing force, the limiting block 31 abuts against the other side of the elastic rod 147, thereby squeezing the elastic rod 147 in a direction away from the receiving groove 146. On the opposite side of the receiving groove 146 relative to the elastic rod 147 is the side wall of the slide groove 141. The side wall of the slide groove 141 will limit the swing of the elastic rod 147, so that the limiting block 31 cannot move upward, thereby preventing the user from accidentally touching the sliding sleeve 3 and giving it an upward pushing force, causing the tail end of the injection needle 2 to be exposed and resulting in accidental puncture. This further avoids the safety risks that exist when disassembling the tail end of the injection needle.

[0050] Optionally, the lower end of the elastic rod 147 is inclined toward the slide groove 141, and the distance between the lower end of the elastic rod 147 and the side wall of the slide groove 141 away from the receiving groove 146 is less than the width of the limiting block 31.

[0051] In this embodiment, as Figures 4 to 6 As shown, the lower end of the elastic rod 147 is inclined toward the slide groove 141, and the distance between the lower end of the elastic rod 147 and the side wall of the slide groove 141 away from the receiving groove 146 is less than the width of the limiting block 31. With this configuration, because the lower end of the elastic rod 147 is inclined toward the slide groove 141, when the limiting block 31 moves downward along the slide groove 141, the limiting block 31 will press one side of the lower end of the elastic rod 147 toward the receiving groove 146, causing the elastic rod 147 to swing toward the receiving groove 146. The limiting block 31 can continue to move downward, and after the limiting block 31 passes, the pressing force on the lower end of the elastic rod 147 disappears, and the elastic rod 147 returns to its original position. At this time, if the sliding sleeve 3 is subjected to an upward pushing force, the limiting block 31 and the lower end of the elastic rod 147... The other side abuts against each other, thereby squeezing the lower end of the elastic rod 147 in a direction away from the receiving groove 146. Relative to the lower end of the elastic rod 147, the side wall of the slide groove 141 is located on the opposite side of the receiving groove 146. The side wall of the slide groove 141 will limit the swing of the lower end of the elastic rod 147, so that the limiting block 31 cannot move upward, thereby preventing the user from accidentally touching the sliding sleeve 3 and giving it an upward push, causing the tail end of the injection needle 2 to be exposed and resulting in accidental puncture. This further avoids the safety risks that exist when the tail end of the injection needle is disassembled.

[0052] It should be noted that, as Figures 4 to 6 As shown, to improve the connection stability between the needle holder 14 and the insulin pen, a connecting seat is also provided. The connecting seat is a hollow structure with openings at both the top and bottom. The needle holder 14 and the connecting seat are connected vertically. The inner wall of the connecting seat is provided with threads. The connecting seat is used to connect to the insulin pen through the threads. This design allows the upper end of the insulin pen to be screwed into the connecting seat, improving the connection stability between the needle holder 14 and the insulin pen. Moreover, the tail end of the injection needle 2 inside the needle holder 14 punctures into the vial as the insulin pen rotates and moves upward. In addition, the lower end of the sliding sleeve 3 is located inside the connecting seat. This design allows the lower end of the sliding sleeve 3 to abut against the lower end of the sliding sleeve 3 as the insulin pen rotates and moves upward and is installed in the connecting seat, thereby driving the sliding sleeve 3 to move upward.

[0053] On the other hand, one embodiment of the present invention provides an injection device, including an injection needle 2, an insulin pen, and the above-described injection needle shielding structure.

[0054] like Figures 1 to 6 As shown, the technical effect of the injection device in this embodiment is similar to that of the injection needle shielding structure described above, and will not be repeated here.

[0055] 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 shielding structure for an injection needle, characterized in that, include: Mounting sleeve (1), the mounting sleeve (1) is used to mount the injection needle (2) of the injection device and is mounted on the insulin pen of the injection device; The sliding sleeve (3) is slidably installed inside the mounting sleeve (1) and is for the injection needle (2) to pass through. The sliding sleeve (3) is locked to the mounting sleeve (1). When the mounting sleeve (1) is installed on the insulin pen, the insulin pen drives the sliding sleeve (3) to release the locking connection with the mounting sleeve (1). After the mounting sleeve (1) is released from the insulin pen, the sliding sleeve (3) is used to move toward the lower end of the mounting sleeve (1) and cover and shield the lower end of the injection needle (2). Upper sliding sleeve (4), the upper sliding sleeve (4) is located at the upper end of the mounting sleeve (1) and is slidably connected to the mounting sleeve (1). The upper sliding sleeve (4) is used to move up and down so that the upper end of the injection needle (2) extends out of the upper sliding sleeve (4) or the upper sliding sleeve (4) covers and shields the upper end of the injection needle (2). The mounting sleeve (1) includes a mounting shell (13) and a needle holder (14). The mounting shell (13) is fitted onto the needle holder (14). The outer wall of the upper sliding sleeve (4) is slidably connected to the inner wall of the mounting shell (13). The needle holder (14) is used to mount the injection needle (2) and is mounted on the insulin pen. The needle holder (14) is a hollow structure with an open lower end. The lower sliding sleeve (3) is installed inside the needle holder (14). The inner wall of the needle holder (14) is provided with a sliding groove (141) and a limiting groove (142). The sliding groove (141) extends along the axial direction of the needle holder (14). The limiting groove (142) is located on the upper side of the sliding groove (141) and communicates with the sliding groove (141). A third inclined surface (143) is provided at the connection between the limiting groove (142) and the sliding groove (141). The connection between the third inclined surface (143) and the sliding groove (141) is higher than the connection between the third inclined surface (143) and the limiting groove (142). A limiting block (31) is provided on the upper side wall of the sliding sleeve (3). The limiting block (31) is used to be placed in the limiting groove (142). The upper end of the limiting block (31) is used to abut against the third inclined surface (143).

2. The injection needle shielding structure according to claim 1, characterized in that, In the moving direction of the upper sliding sleeve (4), a limiting ring (5) and a first elastic element (6) are sequentially provided between the upper sliding sleeve (4) and the mounting sleeve (1). The lower end of the upper sliding sleeve (4) is provided with a first inclined surface (41). A locking block (51) is provided on the outer side wall of the limiting ring (5). The locking block (51) abuts against the first inclined surface (41). The inner wall of the mounting sleeve (1) is provided with a locking groove (11) and a moving groove (12). The moving groove (12) extends along the axial direction of the mounting sleeve (1). The locking groove (11) is located on the upper side of the moving groove (12) and communicates with the moving groove (12). The locking block (51) is used to be placed in the moving groove (12). The first inclined surface (41) passes through the moving groove (12) along the circumference of the mounting sleeve (1). The upper end of the first inclined surface (41) is closer to the locking groove (11) than the lower end.

3. The injection needle shielding structure according to claim 2, characterized in that, The upper sliding sleeve (4) is a hollow structure with an opening at the lower end. The limiting ring (5) is slidably installed inside the upper sliding sleeve (4) through the opening end of the upper sliding sleeve (4). The upper surface of the locking block (51) is provided with a second inclined surface (511). The second inclined surface (511) is parallel to the first inclined surface (41), and the second inclined surface (511) abuts against the first inclined surface (41).

4. The injection needle shielding structure according to claim 2, characterized in that, The moving groove (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 sleeve (1). The reset groove (122) is located between the guide groove (121) and the locking groove (11). The upper and lower ends of the reset groove (122) are respectively connected to the locking groove (11) and the guide groove (121). The locking block (51) is used to be placed in the guide groove (121).

5. The injection needle shielding structure according to claim 1, characterized in that, The limiting block (31) has a fourth inclined surface (311) on the side away from the slide groove (141), and a fifth inclined surface (1411) is provided at the connection between the slide groove (141) and the limiting groove (142). The lower end of the fifth inclined surface (1411) is closer to the slide groove (141) than the upper end. The fourth inclined surface (311) is parallel to the fifth inclined surface (1411). When the limiting block (31) moves down along the slide groove (141) and passes through the connection between the slide groove (141) and the limiting groove (142), the fourth inclined surface (311) is used to abut against the fifth inclined surface (1411).

6. The injection needle shielding structure according to claim 1, characterized in that, The needle holder (14) is provided with a mounting post (144), which is used to install the injection needle (2) through it. A second elastic element (145) is sleeved on the mounting post (144), and the sliding sleeve (3) is sleeved on the mounting post (144). The upper and lower ends of the second elastic element (145) abut against the inner top wall of the needle holder (14) and the sliding sleeve (3) respectively. When the limiting block (31) is located in the limiting groove (142), the second elastic element (145) is in a compressed state.

7. The injection needle shielding structure according to claim 6, characterized in that, The inner wall of the needle seat (14) is also provided with a receiving groove (146). The middle section of the slide groove (141) is connected to the receiving groove (146). An elastic rod (147) is provided between the slide groove (141) and the receiving groove (146). The elastic rod (147) is inclined toward the slide groove (141) and is used to swing back and forth between the slide groove (141) and the receiving groove (146).

8. The injection needle shielding structure according to claim 7, characterized in that, The lower end of the elastic rod (147) is inclined toward the slide groove (141), and the distance between the lower end of the elastic rod (147) and the side wall of the slide groove (141) away from the receiving groove (146) is less than the width of the limiting block (31).

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

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