Insulin needle extractor

Abstract

An insulin needle extractor is characterized in that a sleeve-shaped shell is designed, the inner cavity of the sleeve is used as a channel, a claw sleeve composed of at least two elastic claws is designed for the channel, a slope or a taper is arranged between the inner wall of the channel of the shell and the outer side of the claw sleeve, the claw sleeve is inserted into the channel of the shell, and the elastic claws are forced to present two working states of opening and contraction relative to the center of the channel during the sliding of the claw sleeve before and after the channel. When the needle is removed, the insulin needle is inserted from the needle removal port in the open state of the elastic claws, and the claw sleeve is moved to the other end in the channel, the elastic claws are forced to contract to the center during the movement due to the effect of the slope or the taper, and the insulin needle is clamped, at this time, the needle extractor can be rotated in the reverse direction until it is separated, and the insulin needle can be removed from the head of the insulin injection pen. The present scheme only has the cooperation of the shell and the needle extraction sleeve (the claw sleeve), has few parts, simple structure, and reliable work.

Description

Technical Field

[0001] This invention relates to the field of medical insulin injection devices, and particularly to an insulin needle removal device. This device is highly versatile and allows for quick and convenient removal of the insulin needle from an insulin pen. Background Technology

[0002] Diabetes is a metabolic disease characterized by high blood sugar. There is currently no cure, but injecting insulin can effectively control the condition.

[0003] Insulin injection tools come in various forms. Common insulin injection tools consist of an insulin needle and an insulin pen. The insulin pen carries a prescribed amount of liquid insulin and is reusable, while the insulin needle is a single-use needle. Diabetic patients need to inject insulin frequently in their daily lives; however, accidental finger injuries from the needle tip often occur when frequently attaching and detaching the insulin needle. To address the problems of needle removal and accidental finger injuries, those skilled in the art have designed insulin needle removal devices.

[0004] Chinese patent CN114404738A published an invention patent application on April 29, 2022, with patent number 202111582955.9, entitled "A Portable Insulin Pen Needle Retrieval Device". While theoretically feasible, this application has the following drawbacks from a practical production and market perspective: 1. Complex structure and numerous parts. As seen in the embodiment of this application, the needle retrieval device consists of eight parts. Except for the spring and nut, which can use standard parts, the rest require mold design and injection molding. Therefore, the production cost cannot be low, resulting in a lack of market competitiveness. 2. The needle holder has specific outer diameter and shape requirements for fitting the insulin needle, which limits its versatility and prevents it from simultaneously retrieving insulin needles of different outer diameters and shapes. 3. Lack of finger protection design. During use, the needle tip may accidentally injure the fingers, especially for older users due to poor eyesight or hand tremors.

[0005] Therefore, how to improve existing needle extractors to further reduce the risk of accidental finger injury during use and improve safety is the problem that this invention needs to solve. Summary of the Invention

[0006] This invention provides an insulin needle extraction device, the purpose of which is firstly to solve the problems of complex structure and high cost of existing needle extraction devices, and secondly to solve the safety problems in the use of existing needle extraction devices.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is: an insulin needle extraction device, the innovation of which is: including a shell and a needle extraction sleeve.

[0008] The main body of the outer shell is a sleeve structure, and the inner cavity of the sleeve forms a channel. The front and rear ports of the channel are both open ports.

[0009] The needle extraction cannula mainly consists of a sleeve-shaped base and at least two elastic claws provided on the sleeve-shaped base. The elastic claws are elastic arm structures, and each elastic claw is evenly or symmetrically distributed in the circumferential direction of the cross-section of the sleeve-shaped base. The roots of all elastic claws are connected to the sleeve-shaped base to form an integral structure.

[0010] The inner wall of the channel engages with the outer side of the elastic claw, and at least one of the engaging surfaces of the inner wall of the channel and the outer side of the elastic claw is provided with an inclined surface or a conical surface.

[0011] In the assembled state, the needle extraction sleeve is inserted into the channel of the outer shell and can slide back and forth relative to the channel axis. During the sliding process, the outer side of the elastic claw on the needle extraction sleeve cooperates with the inner wall of the outer shell, so that each elastic claw is in two working states of opening and contraction relative to the center of the channel.

[0012] The relevant content and changes of the above technical solution are explained as follows:

[0013] 1. In the above scheme, "front" in "front and back," "front end," and "forward" refers to the direction towards the disassembled insulin needle. "Back" in "front and back" and "rear end" refers to the opposite direction of "front."

[0014] 2. In the above scheme, the conical surface is an inner conical surface, which is located on the inner wall of the channel of the outer shell. The large end of the inner conical surface is located on the front port side, and the small end of the inner conical surface is located on the rear port side.

[0015] 3. In the above scheme, the inner wall of the channel of the outer shell is provided with an inner front stop and an inner rear stop. Corresponding to the inner front stop, an outer front stop is provided on the needle retrieval sleeve, and corresponding to the inner rear stop, an outer rear stop is provided on the needle retrieval sleeve. During the axial back-and-forth sliding of the needle retrieval sleeve relative to the channel of the outer shell, the outer front stop and the inner front stop cooperate to keep the needle retrieval sleeve in the sliding rear end limit position relative to the outer shell, while the outer rear stop and the inner rear stop cooperate to keep it in the sliding front end limit position relative to the outer shell.

[0016] 4. In the above scheme, the inner edge front face and the inner edge rear face are formed by the front and rear sides of the inner edge protrusion on the inner wall of the outer shell channel.

[0017] 5. In the above scheme, the outer edge front stop is formed by a stepped surface provided on the outer side of the elastic claw; the outer edge rear stop is provided on the elastic claw, or the needle extraction sleeve is provided with a spring piece, and the outer edge rear stop is formed by the end face or stepped surface on the spring piece.

[0018] 6. In the above scheme, a hand-held disc is provided on the outer edge of the shell. The hand-held disc has a disc-shaped structure and is integrally formed with the shell or fixed on the outer edge of the shell.

[0019] 7. In the above solution, a hand guard is provided on the outer edge of the outer shell. The hand guard is an umbrella-shaped object. One end of the umbrella-shaped object has a concave surface. The radial dimension of the concave surface is larger than the outer diameter of the needle unloading port at the head of the outer shell. In use, the hand guard is positioned on the outer shell. The needle unloading port is located at the center of the concave surface, and the concave surface faces the front of the needle unloading port, thereby forming a protective shield structure around the needle unloading port.

[0020] 8. In the above scheme, the hand guard plate is fitted onto the outer shell, or is connected to the outer shell as an integral structure.

[0021] 9. In the above scheme, the inclined surface is an outer inclined surface, which is provided on the needle retrieval sleeve and located outside the elastic claw.

[0022] 10. In the above scheme, a hand guard is provided on the outer edge of the needle removal sleeve. The hand guard is an umbrella-shaped object with a concave surface at one end. The radial dimension of the concave surface is larger than the outer diameter of the needle removal port at the head of the outer shell. In use, the hand guard is positioned on the outer shell. The needle removal port is located at the center of the concave surface, and the concave surface faces the front of the needle removal port, thereby forming a protective shield structure around the needle removal port.

[0023] The design principle of this invention is as follows: To solve the problems of complex structure and high cost of existing needle retrievers, this invention adopts the following technical measures: First, a sleeve-shaped outer shell is designed, with the inner cavity of the sleeve serving as a channel; second, a claw sleeve (i.e., needle retrieval sleeve) composed of at least two elastic claws is designed for the channel; third, an inclined surface or conical surface is provided on at least one of the inner wall of the channel of the outer shell and the outer side of the claw sleeve. During use, the claw sleeve is inserted into the channel of the outer shell. During the back-and-forth sliding of the claw sleeve relative to the channel, the elastic claws cooperate with the channel of the outer shell, and under the action of the inclined surface or conical surface, each elastic claw is forced to be in two working states: open and contracted relative to the center of the channel. When removing the needle, with each elastic claw in the open state, the insulin needle is inserted from the needle removal port, and the claw sleeve is pushed to move to the other end in the channel. During the movement, due to the cooperation of the elastic claws with the channel, each elastic claw is forced to contract towards the center and clamp the insulin needle. At this time, the needle retriever can be rotated in the reverse direction until it is disengaged to remove the insulin needle from the head of the insulin pen. Finally, the insulin needle will fall out of the needle retriever by pushing the claw sleeve in the reverse direction.

[0024] Due to the application of the above technical solution, the present invention has the following advantages and effects compared with the prior art:

[0025] 1. This invention requires only two parts—the outer shell and the needle extraction sleeve—to realize the needle removal function of the needle extractor, and both parts can be injection molded in one step. In other words, only two molds are needed to produce the needle extractor product. Compared to the existing technology with six molds, this saves four molds. Due to the reduction in the number of parts and molds, manufacturing costs will be greatly reduced, and market competitiveness will be improved.

[0026] 2. In addition to having fewer parts, the structure of this invention is also relatively simple. Compared with the existing technology which requires eight parts and six molds, the structure is greatly simplified, while the function and effect are basically the same.

[0027] 3. This invention employs an elastic claw that engages with the outer shell channel to hold the insulin needle. As the needle is inserted, the elastic claw contracts, tightening its grip until it reaches a relatively locked state, preventing it from loosening during subsequent rotation. Therefore, this solution offers a simple and reliable process for removing the insulin needle, from insertion to rotation and disengagement, demonstrating significant advantages.

[0028] 4. Because each elastic claw in this invention has two working states during needle removal—opening and retracting—it can simultaneously adapt to the requirements of clamping and disassembling insulin needles of different outer diameters and shapes. Compared with existing technologies, it has strong adaptability and good versatility.

[0029] 5. When a hand guard is installed on the outer shell or needle removal cannula, this invention forms a protective shield structure around the needle removal port. Due to the protection of the umbrella-shaped hand guard, even if the needle is inserted incorrectly during removal, it will not puncture the finger, avoiding accidental injury and cross-infection, and eliminating the risk of accidental injury. It is especially suitable for elderly patients, those with poor eyesight, or those with tremors, without accidentally injuring their fingers. Attached Figure Description

[0030] Appendix Figure 1 This is a front view of the needle extractor and hand protection plate assembly according to Embodiment 1 of the present invention;

[0031] Appendix Figure 2 This is a cross-sectional view of the needle extractor and hand protection disc assembly according to Embodiment 1 of the present invention;

[0032] Appendix Figure 3 This is a left view of the needle extractor and hand protection plate assembly according to Embodiment 1 of the present invention;

[0033] Appendix Figure 4 This is an exploded view of the needle extractor and hand protection plate of Embodiment 1 of the present invention;

[0034] Appendix Figure 5This is an anatomical view of the needle extractor and hand guard plate according to Embodiment 1 of the present invention;

[0035] Appendix Figure 6 This is a cross-sectional view of the needle extractor housing according to Embodiment 1 of the present invention;

[0036] Appendix Figure 7 This is a cross-sectional view of the needle extraction sleeve of the needle extraction device according to Embodiment 1 of the present invention;

[0037] Appendix Figure 8 This is a perspective view of the needle extraction sleeve of the needle extraction device according to Embodiment 1 of the present invention;

[0038] Appendix Figure 9a This is a schematic diagram of the needle extractor before needle insertion in Embodiment 1 of the present invention;

[0039] Appendix Figure 9b This is a schematic diagram of the needle extraction device after needle insertion in Embodiment 1 of the present invention;

[0040] Appendix Figure 9c This is a schematic diagram illustrating the needle removal principle of the needle removal device in Embodiment 1 of the present invention.

[0041] Appendix Figure 10a This is a diagram showing the forward position of the needle-retrieving sleeve relative to the outer shell in Embodiment 1 of the present invention.

[0042] Appendix Figure 10b This is a diagram showing the final axial position of the needle-retrieving sleeve relative to the outer shell in Embodiment 1 of the present invention.

[0043] Appendix Figure 11a This is a diagram showing the insertion of a small-diameter insulin needle into the needle retriever in Embodiment 1 of the present invention.

[0044] Appendix Figure 11b This is a diagram showing the insertion of a large-diameter insulin needle into the needle retriever in Embodiment 1 of the present invention.

[0045] Appendix Figure 12 This is a schematic diagram of the initial state of needle removal in Embodiment 1 of the present invention;

[0046] Appendix Figure 13 This is a schematic diagram of the needle insertion state in Embodiment 1 of the present invention;

[0047] Appendix Figure 14 This is a schematic diagram of the hand protection state during needle removal in Embodiment 1 of the present invention;

[0048] Appendix Figure 15 This is a schematic diagram of the needle removal process in the non-hand protection state according to Embodiment 1 of the present invention;

[0049] Appendix Figure 16 This is a schematic diagram of the needle removal state in Embodiment 1 of the present invention;

[0050] Appendix Figure 17 This is a schematic diagram of the needle ejection state in Embodiment 1 of the present invention;

[0051] Appendix Figure 18 This is a perspective view of Embodiment 2 of the present invention;

[0052] Appendix Figure 19 This is a cross-sectional view of Embodiment 2 of the present invention;

[0053] Appendix Figure 20 This is a three-dimensional sectional view of Embodiment 2 of the present invention;

[0054] Appendix Figure 21 This is a first-view exploded perspective view of Embodiment 2 of the present invention;

[0055] Appendix Figure 22 This is a second-view exploded perspective view of Embodiment 2 of the present invention.

[0056] The labels in the above attached figures are explained as follows:

[0057] 1. Hand guard plate; 2. Concave surface; 3. Needle extractor; 4. Needle removal port; 5. Mounting hole; 6. Annular mounting surface; 7. Positioning end face; 8. Outer shell; 9. Needle extraction cannula; 10. Hand grip plate; 11. Insulin needle; 12. Insulin pen; 13. Finger; 14. Inner edge raised ring; 15. Inner edge front stop; 16. Inner edge rear stop; 17. Inner conical surface; 18. Flexible claw; 19. Outer edge front stop; 20. Outer edge rear stop; 21. Spring; 22. Outer bevel. Detailed Implementation

[0058] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0059] Example 1: An insulin needle extractor

[0060] like Figure 1-Figure 1 As shown in Figure 1, the needle extractor consists of a housing 8, a needle extraction sleeve 9, and a hand guard plate 1 (see Figure 1). Figures 1-5 ).

[0061] The main body of the outer shell 8 is a sleeve structure (see...). Figure 6 The inner cavity of the sleeve forms a channel, with both the front and rear ports being open. The front port is the needle removal port 4 (see...). Figure 6 The inner wall of the channel is provided with an inner conical surface 17 (see...). Figure 6 The large end of the inner conical surface 17 is located on the front port side, and the small end of the inner conical surface 17 is located on the rear port side. A hand-held disc 10 is provided on the outer edge of the outer casing 8 (see...). Figure 6 The handheld disc 10 has a disc-shaped structure and is integrally formed with the outer shell 8 or fixed on the outer edge of the outer shell 8. The function of the handheld disc 10 is to facilitate hand holding.

[0062] The needle-retrieving cannula 9 consists of a sleeve-shaped base, four elastic claws 18 disposed on the sleeve-shaped base, and two spring pieces 21 (see...). Figure 7 and Figure 8 The sleeve-shaped base is an annular body, a sleeve, or a disk (in this embodiment, a short section of sleeve is used, see...). Figure 8 The elastic claw 18 is an elastic arm structure (see...). Figure 7 and Figure 8 Each elastic claw 18 is evenly or symmetrically distributed along the circumferential direction of the cross-section of the sleeve-shaped base, and the root of all elastic claws 18 is connected to the sleeve-shaped base to form an integral structure (see...). Figure 7 and Figure 8 ).

[0063] In the assembled state, the needle extraction sleeve 9 is inserted into the channel of the outer casing 8 (see...). Figure 2 It can slide back and forth relative to the channel axis. During the sliding process, the elastic claws 18 on the needle sleeve 9 cooperate with the inner conical surface 17 on the outer shell 8, so that each elastic claw 18 presents two working states of opening and contraction relative to the center of the channel.

[0064] In this embodiment, to limit the forward and backward movement of the needle-retrieving cannula 9 along the axial direction of the channel of the housing 8, an inner edge front stop 15 and an inner edge rear stop 16 are provided on the inner wall of the channel of the housing 8 (see...). Figure 6 The inner edge front facet 15 and inner edge rear facet 16 are formed by the front and rear sides of the inner edge protrusion 14 on the inner wall of the outer casing 8 channel (see...). Figure 6 Corresponding to the inner edge front stop 15, an outer edge front stop 19 is provided on the needle extraction sleeve 9. The outer edge front stop 19 is formed by a stepped surface provided on the outer side of the elastic claw 18 (see...). Figure 7 and Figure 8 Corresponding to the inner edge rear stop 16, an outer edge rear stop 20 is provided on the needle extraction sleeve 9. The outer edge rear stop 20 is formed by the end face or stepped surface on the spring piece 21 (see...). Figure 8 During the axial back-and-forth sliding of the needle extraction cannula 9 relative to the channel of the outer casing 8, the outer edge front stop 19 and the inner edge front stop 15 cooperate to keep the needle extraction cannula 9 in the sliding rear end limit position relative to the outer casing 8 (see...). Figure 10b The outer rear stop 20 and the inner rear stop 16 cooperate to keep the relative outer shell 8 in the sliding front end limit position (see...). Figure 10a ).

[0065] In this embodiment, to protect the fingers from accidental injury, a hand guard plate 1 is provided on the outer edge of the outer casing 8 (see...). Figure 1 , Figure 2 , Figure 4 and Figure 5 The hand guard plate 1 is an umbrella-shaped object, one end of which has a concave surface 2 (see...). Figure 5The radial dimension of the concave surface 2 is larger than the outer diameter of the needle removal port 4 at the head of the outer casing 8. In use, the hand guard 1 is positioned on the outer casing 8, with the needle removal port 4 located at the center of the concave surface 2, and the concave surface 2 facing the front of the needle removal port 4, thus forming a protective shield structure around the needle removal port 4. The hand guard 1 has a mounting hole 5 at its center (see...). Figure 5 Corresponding to the mounting hole 5, an annular mounting surface 6 with a matching shape and size is provided on the head of the outer casing 8. In use, the hand guard 1 is fitted onto the outer casing 8. The radial dimension of the concave surface 2 is greater than twice the outer diameter of the needle removal port 4 on the head of the outer casing 8, and less than three times the outer diameter of the needle removal port 4 on the head of the outer casing 8. The annular mounting surface 6 is designed as a tapered surface. The outer edge of the hand guard 1 has a circular outline.

[0066] The working principle of this embodiment is briefly described below:

[0067] Figure 9a This indicates the state of the needle extractor before the needle is inserted. From Figure 9a As can be seen, the needle extraction cannula 9 is located at the front limiting position relative to the outer shell 8, and the insulin needle 11 is located in front of the needle removal port 4 of the needle extractor 3. Figure 9b This indicates the state of the needle extractor after pin 3 has been inserted. From Figure 9b As can be seen, the insulin needle 11 extends into the grippers formed by the elastic claws 18. As the insulin needle 11 moves backward, it drives the needle retrieval cannula 9 to move backward. At this time, each elastic claw 18 contacts the inner conical surface 17. Under the action of the inner conical surface 17, each elastic claw 18 contracts towards the center and clamps the insulin needle 11 until the needle retrieval cannula 9 stops at the rear end limit position relative to the outer shell 8. Then, the needle retrieval device 3 is rotated in the opposite direction to unscrew the insulin needle 11 from the insulin pen 12. Figure 9c This indicates the needle removal status of needle extractor 3. From Figure 9c As can be seen, when the finger 13 pushes forward from the rear end of the needle retrieval sleeve 9, the needle retrieval sleeve 9 moves forward in the channel of the outer shell 8. At this time, each elastic claw 18 opens outward, releasing the insulin needle 11 and pushing the insulin needle 11 out of the needle retrieval device 3.

[0068] Figure 11a This diagram shows the state of the small-diameter insulin needle 11 being inserted into the needle extractor 3. Figure 11b This diagram shows the state of the large-diameter insulin needle 11 inserted into the needle extractor 3. From... Figure 11a and Figure 11b The comparison shows that Figure 11a The distance represented by S1 is greater than Figure 11b S2 represents the distance. This also demonstrates that the present invention can accommodate insulin needles 11 with different outer diameters.

[0069] The needle extractor 3 and hand protection plate 1 of the present invention will be described below in conjunction with their usage:

[0070] 1. Initial state of needle removal

[0071] Figure 12 This diagram illustrates the initial state of needle retrieval according to an embodiment of the present invention. Figure 12 As can be seen, first, the hand guard 1 is placed on the annular mounting surface 6 of the needle extractor 3 head, so that the hand guard 1 and the needle extractor 3 fit tightly. Then, the insulin pen 12 with the insulin needle 11 is aligned with the needle removal port 4 of the needle extractor 3.

[0072] 2. Needle insertion state

[0073] Figure 13 This diagram illustrates the needle insertion state according to an embodiment of the present invention. Figure 13 As can be seen, the insulin pen 12 with the insulin needle 11 is inserted into the needle extractor 3 through the needle removal port 4.

[0074] Figure 14 This diagram illustrates the hand protection state when the insulin needle is misaligned. If the needle is misaligned, the insulin needle 11 will be inserted into the hand protection plate 1, which effectively protects the finger 13.

[0075] Figure 15 This diagram illustrates the non-hand-protected state when needle insertion is misaligned. When holding the needle extractor 3 without the hand-protected disc 1 and inserting the insulin pen 12 with the insulin needle 11 into the needle extractor 3, if the insertion is misaligned, not only will it fail to insert into the needle removal port 4 of the needle extractor 3, but the insulin needle 11 may also accidentally injure the finger 13.

[0076] 3. Needle unscrewing state

[0077] Figure 16 This diagram illustrates the needle removal state according to an embodiment of the present invention. Figure 16 As can be seen, by rotating the needle extractor 3 in the opposite direction, the insulin needle 11 is unscrewed from the insulin pen 12, the needle extractor 3 is separated from the insulin pen 12, and the insulin needle 11 remains inside the needle extractor 3.

[0078] 4. Needle ejection state

[0079] Figure 17 This diagram illustrates the needle ejection state according to an embodiment of the present invention. Figure 17 As can be seen, with the needle removal port 4 of the needle extractor 3 containing the insulin needle 11 facing away from the human body, press the top of the needle extraction sleeve 9 to push the insulin needle 11 out of the needle removal port 4 of the needle extractor 3, and then discard the insulin needle 11.

[0080] Example 2: An insulin needle extraction device

[0081] like Figure 18-22As shown, the difference between the insulin needle extractor in this embodiment and that in Embodiment 1 is:

[0082] First, the inclined surface that drives or forces the elastic claw 18 is the outer inclined surface 22 (see...). Figure 19-22 The outer bevel (22) is provided on the needle-retrieving sleeve 9 and is located outside the elastic claw 18. The inner wall of the channel of the outer casing 8 may have a bevel or a conical surface, or it may not have a bevel or a conical surface. In this embodiment, there are two elastic claws 18, but the invention is not limited to this; there may be three, four, or even more. This is something that those skilled in the art can understand and accept.

[0083] Second, the hand guard 1 is disposed on the outer edge of the needle extraction sleeve 9 (see...). Figure 19 , Figure 21 and Figure 22 ).

[0084] Third, the heads of each elastic claw 18 on the needle retrieval sleeve 9 are all connected to the hand guard plate 1 as an integral structure, but this does not affect the elastic deformation of the elastic claw 18 when it opens and closes. In Embodiment 1, each elastic claw 18 is a cantilever structure on the needle retrieval sleeve 9, while in Embodiment 2, the front end of each elastic claw 18 is connected to the hand guard plate 1 as an integral structure, and the rear end of each elastic claw 18 is connected to the sleeve-shaped base as an integral structure. Each elastic claw 18 is separated on the needle retrieval sleeve 9 by a perforated groove, the length direction of which is consistent with the axial direction of the needle retrieval sleeve 9.

[0085] Fourth, the outer edge rear stop surface 20 is provided on the elastic claw 18. In fact, the outer edge rear stop surface 20 is directly parasitic on the elastic claw 18, utilizing the elasticity of the elastic claw 18. In Embodiment 1, a spring piece 21 is specially provided on the needle extraction sleeve 9, and the outer edge rear stop surface 20 is formed by the end face or stepped surface on the spring piece 21.

[0086] The other contents are basically the same as in Example 1, and will not be described again here.

[0087] The possible variations of the present invention in relation to the above embodiments are described below:

[0088] 1. In the above embodiment 1, a handheld disc 10 is provided on the outer edge of the outer shell 8 (see... Figure 6 The hand-held tray 10 is designed to facilitate holding the device. However, the invention is not limited to this. While the hand-held tray 10 is not essential for the needle extractor 3, its design makes the needle extractor 3 easier to hold. This is something that those skilled in the art can understand and accept.

[0089] 2. In the above embodiment 1, the needle extraction cannula 9 is provided with four elastic claws 18 (see... Figure 8However, the present invention is not limited to this. Theoretically, the number of elastic claws 18 is at least two, such as two, three, five, six, or even more, all of which can achieve the same technical effect. This is something that those skilled in the art can understand and accept.

[0090] 3. In the above embodiment 1, the needle extraction sleeve 9 is provided with two spring pieces 21 (see Figure 8 However, the present invention is not limited to this; theoretically, at least one is sufficient, but it is preferable to use two evenly distributed in the circumferential direction. This is something that those skilled in the art can understand and accept.

[0091] 4. In the above embodiment 1, the front-end limiting position is achieved (see...) Figure 10a ) and rear limit position (see Figure 10b The structure of ) is not unique for the purposes of this invention; in other words, the invention is not limited to this. For example, it can be used to implement the front-end limiting position (see Figure 10a The structure can be achieved by having a protrusion on the outer side of the tail of the needle extraction sleeve 9 cooperate with the rear end of the outer shell 8. This design in the embodiment of the invention is simpler and more reliable in effect. This is something that those skilled in the art can understand and accept.

[0092] 5. In the above embodiment 1, in order to protect the fingers from accidental injury, a hand guard plate 1 is provided on the outer edge of the outer shell 8 (see...). Figure 1 , Figure 2 , Figure 4 and Figure 5 However, the present invention is not limited thereto, because the hand guard 1 is not necessary in the present invention. The hand guard 1 is to solve a safety problem. This is something that those skilled in the art can understand and accept.

[0093] 6. In Embodiment 1 above, the hand guard plate 1 and the outer shell 8 are separate designs. However, the present invention is not limited to this; the hand guard plate 1 can be integrally fixedly connected to the outer edge of the head of the outer shell 8. This is something that those skilled in the art can understand and accept.

[0094] 7. In the above embodiment 1, the annular mounting surface 6 is designed as a tapered surface. However, the present invention is not limited to this; the annular mounting surface 6 can also be designed as a cylindrical surface, with a positioning end face 7 at the root of the cylindrical surface (see...). Figure 4 ).

[0095] 8. In Embodiment 1 above, the outer edge of the hand guard plate 1 has a circular outline. However, the present invention is not limited to this, and can adopt an elliptical shape, a polygon, etc. This is something that those skilled in the art can understand and accept.

[0096] 9. In the above embodiment 1, in order to increase the guiding effect, a guide tube (not shown) can be provided at the center of the concave surface 2 of the hand guard plate 1. The outer diameter of the guide tube is smaller than the radial dimension of the concave surface 2, and the inner diameter of the guide tube is greater than or equal to the diameter of the needle removal port 4. The port in front of the guide tube is provided with an inner conical surface that plays a guiding role.

[0097] The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. An insulin needle extractor, characterized in that: Includes a housing (8) and a needle extraction cannula (9); The main body of the outer shell (8) is a sleeve structure, and the inner cavity of the sleeve forms a channel. The front port and the rear port of the channel are both open ports, wherein the front port is the needle unloading port (4); a hand-held disc (10) is provided on the outer edge of the outer shell (8). The hand-held disc (10) is a disc-shaped structure and is integrally formed with the outer shell (8) or fixed on the outer edge of the outer shell (8); The needle-retrieving sleeve (9) is mainly composed of a sleeve-shaped base and at least two elastic claws (18) provided on the sleeve-shaped base. The elastic claws (18) are elastic arm structures. Each elastic claw (18) is evenly or symmetrically distributed in the circumferential direction of the cross-section of the sleeve-shaped base. The roots of all elastic claws (18) are connected to the sleeve-shaped base to form an integral structure. The inner wall of the channel engages with the outer side of the elastic claw (18), and a conical surface is provided on the inner wall of the channel; In the assembled state, the needle-retrieving sleeve (9) is inserted into the channel of the outer shell (8) and can slide back and forth relative to the channel axis. During the sliding process, the outer side of the elastic claw (18) on the needle-retrieving sleeve (9) cooperates with the inner wall of the outer shell (8), so that each elastic claw (18) presents two working states of opening and contraction relative to the center of the channel. The cone surface is an inner cone surface (17), which is located on the inner wall of the channel of the outer shell (8). The large end of the inner cone surface (17) is located on the front port side, and the small end of the inner cone surface (17) is located on the rear port side. The inner wall of the channel of the outer shell (8) is provided with an inner front baffle (15) and an inner rear baffle (16). Corresponding to the inner front baffle (15), an outer front baffle (19) is provided on the needle extraction sleeve (9). Corresponding to the inner rear baffle (16), an outer rear baffle (20) is provided on the needle extraction sleeve (9). During the axial back-and-forth sliding of the needle extraction sleeve (9) relative to the channel of the outer shell (8), the outer front baffle (19) cooperates with the inner front baffle (15) to keep the needle extraction sleeve (9) relative to the outer shell (8) at the rear end limit position of the sliding, while the outer rear baffle (20) cooperates with the inner rear baffle (16) to keep the needle extraction sleeve (9) relative to the outer shell (8) at the front end limit position of the sliding. The inner edge front facet (15) and inner edge rear facet (16) are formed by the front and rear sides of the inner edge protrusion (14) on the inner wall of the outer shell (8); The outer edge front stop (19) is formed by a stepped surface provided on the outside of the elastic claw (18); the needle-taking sleeve (9) is provided with a spring piece (21), and the outer edge rear stop (20) is formed by the end face or stepped surface on the spring piece (21).

2. The needle extractor according to claim 1, characterized in that: The outer edge of the outer shell (8) is provided with a hand guard (1). The hand guard (1) is an umbrella-shaped object. One end of the umbrella-shaped object has a concave surface (2). The radial dimension of the concave surface (2) is larger than the outer diameter of the needle unloading port (4) at the head of the outer shell (8). In the use state, the hand guard (1) is positioned on the outer shell (8). The needle unloading port (4) is located at the center of the concave surface (2). The concave surface (2) faces the front of the needle unloading port (4), thereby forming a protective shield structure around the needle unloading port (4).

3. The needle extractor according to claim 2, characterized in that: The hand guard plate (1) is fitted onto the outer shell (8) or connected to the outer shell (8) as an integral structure.

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