Insulin syringe capable of automatically replacing needle head

Abstract

The insulin syringe is characterized in that injection units which are sequentially in contact connection are arranged in a tube cavity of an injection tube in the axial direction of the injection tube, a pressing block is arranged in the injection tube, an axial push rod of the pressing block upwards extends out of the tube cavity, and a limiting head used for axially limiting the lowest injection unit in the tube cavity is arranged at the lower end of the side wall of the injection tube; the injection unit comprises a liquid medicine core tube, an annular limiting groove is formed in the liquid medicine core tube, a needle tube is detachably fixed to the bottom end of the liquid medicine core tube, an injection push block extending out of the liquid medicine core tube through an injection push rod is arranged in the liquid medicine core tube, and a needle tube protection device axially limiting the injection push rod is detachably fixed to the liquid medicine core tube. According to the structure, when the insulin syringe capable of automatically replacing the needle head is used for insulin injection, a user does not make contact with the needle tube in the whole process, so that the user is prevented from making contact with the needle tube by mistake when replacing the injection unit, and then the user is prevented from being accidentally injured by the needle tube or making contact with blood on the needle tube.

Description

Technical Field

[0001] The present invention relates to the technical field of insulin injection devices, and particularly to an insulin syringe with an automatic needle replacement function. Background Art

[0002] Insulin pens are medical devices that diabetic patients often need to use. The amount of insulin stored in the liquid medicine core tube set in a traditional insulin pen can be used for multiple injections. If it is for self-use by a patient and injected daily, it can be used for more than ten days. However, the needle installed and connected to the traditional insulin pen is disposable, so a new needle needs to be replaced and installed each time of injection. Generally, the user manually installs the needle before each injection and disassembles the needle fixedly installed on the insulin pen after each injection. Not only is there a risk of contacting the residual blood on the used needle during the disassembly process of this needle, but there is also a risk of being stabbed by the needle during the installation and disassembly process of this needle.

[0003] In addition, there is another more hidden but potentially more harmful problem in the use of this kind of insulin pen. That is, because the amount of insulin in the liquid medicine core tube of the insulin pen is generally greater than the amount of one injection, even if the used needle is disassembled from the insulin pen after injection, the structure connected to the needle will inevitably have a channel for delivering insulin that is in communication with the inner cavity of the needle. The insulin in this channel may be contaminated due to contact with air when the needle is disassembled. Even when injecting insulin, insulin will remain in the inner cavity of the needle, and the insulin in the inner cavity of the needle will come into contact with the body fluid of the previous injection patient. The insulin in the inner cavity of the needle is also in contact with the insulin in the delivery insulin channel at the connection part of the insulin pen and the needle before the needle is disassembled. Therefore, this will also cause the insulin in the liquid medicine core tube of the insulin pen to be contaminated. If different patients are injected through the insulin pen, even if the needle is replaced each time, there is still a risk of insulin contamination.

[0004] Therefore, the technical problem that needs to be solved now is to provide an insulin syringe that does not require manual installation and disassembly of the needle each time of injection, avoids accidental injury to the user by the needle, and at the same time avoids contamination of the remaining insulin in the insulin pen after each injection. Summary of the Invention

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art and provide an insulin syringe with an automatic needle replacement function. When injecting insulin through the present application, the user will not come into contact with the syringe tube during the whole process, thereby avoiding the user accidentally contacting the syringe tube when replacing the injection unit, and further avoiding accidental injury to the user by the syringe tube or contact with the blood on the syringe tube.

[0006] The technical solution adopted by the present invention is as follows: An insulin syringe with an automatic needle replacement function, comprising an injection tube. An injection unit is arranged in the lumen of the injection tube along the axial direction of the injection tube in a sequentially contacting connection. At the upper end of the injection tube, a pressing block matching the inner wall of the lumen of the injection tube is provided. An axial push rod provided at the top of the pressing block extends upward out of the lumen. One end of the axial rod extending out of the lumen is fixed with a push plate. At the lower end position of the side wall of the injection tube, a limiting head is provided for axially limiting the lowermost injection unit in the lumen. The injection unit includes a liquid medicine core tube. A circular limiting groove matching the limiting head is coaxially arranged on the side wall of the liquid medicine core tube. A liquid outlet provided at the axis of one end of the liquid medicine core tube is detachably and fixedly connected with a needle tube. At the other end in the liquid medicine core tube, an injection push block is provided. The injection push block extends out of the communication hole of the liquid medicine core tube through an injection push rod. The liquid medicine core tube is also detachably and fixedly connected with a needle tube protection device for axially limiting the injection push rod at the end where the needle tube is located. The end of the injection unit in the lumen where the needle tube is located faces downward, and the needle tube of the lowermost injection unit limited by the limiting head in the lumen extends downward out of the injection tube.

[0007] A further improvement of the present invention is that the needle tube protection device includes a sleeve. The inner wall of the sleeve is detachably and fixedly connected with a needle tube cover. The bottom end of the needle tube is located above the needle tube cover fixedly connected to the sleeve. A plurality of axial limiting rods are evenly arranged on the outer edge of the top pipe orifice of the sleeve. The needle tube cover is detachably and fixedly connected with the end of the corresponding liquid medicine core tube where the liquid outlet is provided. Corresponding axial limiting grooves are respectively arranged on the side wall of the liquid medicine core tube at the positions corresponding to the axial limiting rods. The axial limiting grooves respectively penetrate through both ends of the side wall of the liquid medicine core tube. When the sleeve is fixedly connected with the liquid medicine core tube through the needle tube cover, the axial limiting rods are respectively located in the axial limiting grooves, and the top ends of the axial limiting rods respectively extend upward out of the axial limiting grooves and are in limiting contact connection with the push plate fixedly provided at one end of the injection push rod extending out of the liquid medicine core tube.

[0008] A further improved solution of the present invention is that the end of the liquid medicine core tube at the position of the liquid outlet is coaxially provided with a liquid outlet pipe outward. The nozzle of the liquid outlet pipe is hermetically fixed with a rubber membrane. The end of the liquid medicine core tube at the position of the liquid outlet is located outside the liquid outlet pipe and coaxially provided with a connecting pipe. An annular connecting groove is formed between the connecting pipe and the liquid outlet pipe. The edge of the end of the syringe needle mounting plate facing the liquid medicine core tube, which is fixed with the syringe needle at the center, is coaxially provided with a snap ring. The syringe needle mounting plate is fixedly connected with the liquid medicine core tube through the snap ring clamped in the annular connecting groove. The two ends of the syringe needle respectively extend out of the two opposite side end faces of the syringe needle mounting plate. When the end of the snap ring facing the liquid medicine core tube just extends into the notch position of the annular connecting groove, the end of the syringe needle facing the liquid medicine core tube is located below the rubber membrane. When the end of the snap ring facing the liquid medicine core tube moves upward to be tightly clamped and fixed with the annular connecting groove, the end of the syringe needle facing the liquid medicine core tube penetrates through the rubber membrane and extends into the liquid outlet pipe.

[0009] A further improved solution of the present invention is that the inner groove wall of the annular connecting groove is a tapered arc surface inclined towards the center from bottom to top. The outer wall of the snap ring matches the inner groove wall of the annular connecting groove. A rubber cushion layer is fixedly provided on the surface of the inner groove wall of the annular connecting groove.

[0010] A further improved solution of the present invention is that the syringe needle cover is coaxially arranged at the center of the connecting cover. The cover opening of the connecting cover faces upward and faces the liquid medicine core tube. The syringe needle cover is located at the bottom of the connecting cover and the syringe needle cover communicates with the connecting cover. The cover edge of the connecting cover is coaxially provided with an annular connecting plate outward. At the position of the cover opening on the inner wall of the connecting cover, multiple spiral arc-shaped protrusions are evenly distributed around the center. The outer edge of the annular connecting plate is provided with an external thread B. The upper part of the inner wall of the sleeve is provided with an internal thread B matching the external thread B. The outer wall of the connecting pipe is provided with an external thread A matching the spiral arc-shaped protrusions. The external thread A is evenly distributed with a plurality of axially arranged notches around the center. The number and width of the notches match the spiral arc-shaped protrusions. When the connecting cover contacts the external thread A at the bottom opening position of the liquid outlet pipe through the spiral arc-shaped protrusions and is screwed to the notch position, at this time the connecting cover just pushes up the snap ring of the syringe needle mounting plate to be clamped in the fixed annular connecting groove. The pitch of the external thread A is equal to the pitch of the internal thread B.

[0011] A further improved solution of the present invention is that the edge of the end face of the syringe needle mounting plate facing away from the liquid medicine core tube is provided with an annular positioning groove. The cover edge of the syringe needle cover is provided with a matching positioning convex ring corresponding to the annular positioning groove. The positioning convex ring is in positioning contact connection with the annular positioning groove.

[0012] A further improved solution of the present invention is that a limiting convex ring is coaxially arranged in the middle of the inner wall of the sleeve. The internal thread B extends downward to the top of the limiting convex ring.

[0013] A further improved solution of the present invention is that the inner wall radius of the sleeve is smaller than the distance between the bottom of the axial limiting groove and the axis of the liquid medicine core tube, and the inner wall and both side walls of the axial limiting rod are respectively in corresponding contact with the bottom and side walls of the axial limiting groove.

[0014] A further improved solution of the present invention is that a plurality of axial guiding convex rods are uniformly arranged on the inner side wall of the injection tube corresponding to the axial limiting groove centered on the axis. The axial guiding convex rods respectively extend to be flush with both ends of the injection tube. The distance between the inner wall of the axial guiding convex rod and the axis is equal to the distance between the outer wall of the axial limiting rod and the axis. The two side walls of the axial guiding convex rod are respectively in contact with the two side walls of the corresponding axial limiting groove. The limiting head is located at a position between two adjacent axial guiding convex rods. The outer side wall of the pressing block is provided with a matching axial guiding groove corresponding to the axial guiding convex rod.

[0015] A further improved solution of the present invention is that the limiting head is connected to one end of a limiting swing rod. The limiting swing rod is swingably connected to the outer side wall of the injection tube through a swing shaft. The limiting swing rod is connected to the injection tube through a spring with a pre-applied force. Under the action of the spring, the limiting head extends inward through the side wall of the injection tube into the tube cavity. When pressing one end of the limiting swing rod away from the limiting head, the limiting swing rod swings around the swing shaft against the action of the spring until the limiting head retracts into the tube wall of the injection tube.

[0016] The beneficial effects of the invention are as follows: First, for the automatic needle-changing insulin syringe of the present invention, when insulin is injected through the present application, the user will not contact the syringe needle during the whole process, thus avoiding the user accidentally contacting the syringe needle when replacing the injection unit, and further avoiding the user being injured by the syringe needle or contacting the blood on the syringe needle.

[0017] Second, for the automatic needle-changing insulin syringe of the present invention, the injection unit is used separately, which is suitable for the situation where patients use it by themselves, such as when only one injection is required within the same period of time without multiple injections; the injection unit is used for injection through the injection tube, which is suitable for hospitals or nursing units where multiple patients need to be injected separately within a certain period of time. There is no need to separately load the injection unit every time an injection is made, nor is it necessary to separately spend time replacing the needle every time an injection is made.

[0018] Third, for the automatic needle-changing insulin syringe of the present invention, the injection unit can obtain liquid medicine core tubes filled with different amounts of insulin only by setting different axial lengths of the liquid medicine core tube, so that different amounts of insulin can be used according to different conditions, improving the applicability.

[0019] Fourth, for the insulin syringe with automatic needle replacement of the present invention, through the structures of the connection cover of the injection unit, the sleeve, the syringe tube connection plate, and the liquid medicine core tube, the exposure of the syringe tube and the unlocking of the injection push plate can be simultaneously achieved by the separation of the sleeve from the liquid medicine core tube.

[0020] Fifth, for the insulin syringe with automatic needle replacement of the present invention, the structures of the injection tube and the injection unit are relatively simple, very convenient to use, and facilitate the operation of the user.

[0021] Sixth, for the insulin syringe with automatic needle replacement of the present invention, the injection unit used for each injection is disposable, and a new injection unit will be replaced after each injection, so as to ensure that the insulin injected each time can avoid the hidden danger of being contaminated and can fully guarantee safety. Description of the Drawings

[0022] Figure 1 It is a front view sectional schematic diagram of the present application.

[0023] Figure 2 It is a front view partial sectional schematic diagram of the present application when the injection unit is not installed.

[0024] Figure 3 It is an enlarged front view schematic diagram of the injection unit when the sleeve is connected.

[0025] Figure 4 It is an enlarged front view schematic diagram of the injection unit after separating the sleeve.

[0026] Figure 5 It is an enlarged front view sectional schematic diagram of the injection unit when the sleeve is connected and the syringe tube is not clamped and fixed.

[0027] Figure 6 It is an enlarged front view sectional schematic diagram of the injection unit when the sleeve is connected and the syringe tube is clamped and fixed.

[0028] Figure 7 It is an enlarged front view sectional schematic diagram of the injection unit after separating the sleeve.

[0029] Figure 8 It is an enlarged top view sectional schematic diagram at the position of the annular limiting groove of the injection unit.

[0030] Figure 9 It is an enlarged top view schematic diagram of the sleeve.

[0031] Figure 10 It is an enlarged bottom view schematic diagram of the injection unit.

[0032] Figure 11 It is an enlarged bottom view schematic diagram of the liquid medicine core tube.

[0033] Figure 12 An enlarged upward perspective sectional view at the middle position of the liquid outlet pipe of the liquid medicine core pipe.

[0034] Figure 13 An enlarged upward perspective sectional view of the injection unit after separating the sleeve.

[0035] Figure 14 It is Figure 1 The front view sectional view of the present application after separating the sleeve of the bottom injection unit in

[0036] Figure 15 It is Figure 14 The front view sectional view of the present application after completing the injection of the bottom injection unit in

[0037] Figure 16 It is Figure 15 The front view sectional view of the present application when pushing out the injection unit after completing the injection in

[0038] Figure 17 It is Figure 16 The front view sectional view of the present application when pushing the next injection unit into place in Specific embodiments

[0039] Combined with Figures 1 to 13 As can be seen, the insulin syringe with automatic needle replacement includes an injection tube 2. Inside the lumen 23 of the injection tube 2, injection units 1 are arranged in contact connection in sequence along the axial direction of the injection tube 2. At the upper end inside the injection tube 2, there is a pressing block 3 that matches the inner wall of the lumen 23 of the injection tube 2. The axial push rod 4 provided at the top of the pressing block 3 extends upward out of the lumen 23. One end of the axial rod 4 extending out of the lumen 23 is fixed with a push plate 5. At the lower end position of the side wall of the injection tube 2, there is a limit head 25 for axially limiting the lowermost injection unit 1 inside the lumen 23. The injection unit 1 includes a liquid medicine core tube 6. A circular limit groove 21 that matches the limit head 25 is coaxially arranged on the side wall of the liquid medicine core tube 6. A liquid outlet 10 provided at the center of one end of the liquid medicine core tube 6 is detachably and fixedly connected with a syringe needle 7. At the other end inside the liquid medicine core tube 6, there is an injection push block 12. The injection push block 12 extends out of the communication hole 33 of the liquid medicine core tube 6 through an injection push rod 13. Corresponding to the end where the syringe needle 7 is located, the liquid medicine core tube 6 is also detachably and fixedly connected with a syringe needle protection device that axially limits the injection push rod 13 at the same time. The end where the syringe needle 7 of the injection unit 1 inside the lumen 23 faces downward, and the syringe needle 7 of the lowermost injection unit 1 limited by the limit head 25 inside the lumen 23 extends downward out of the injection tube 2.

[0040] The needle tube protection device includes a sleeve 9, the inner wall of the sleeve 9 is detachably fixedly connected with a needle tube cover 22, the bottom end of the needle tube 7 is located above the needle tube cover 22 fixedly connected to the sleeve 9, and the outer edge of the top tube opening of the sleeve 9 is evenly provided with a plurality of axial limit rods 30, the needle tube cover 22 is detachably fixedly connected to the end of the corresponding medicine liquid core tube 6 with a liquid outlet 10, and the side walls of the medicine liquid core tube 6 are respectively provided with corresponding axial limit grooves 20 corresponding to the positions of the axial limit rods 30, and the axial limit grooves 20 respectively penetrate the two ends of the side walls of the medicine liquid core tube 6, when the sleeve 9 is fixedly connected to the medicine liquid core tube 6 through the needle tube cover 22, the axial limit rods 30 are respectively correspondingly located in the axial limit grooves 20, and the top ends of the axial limit rods 30 respectively extend upward from the axial limit grooves 20 and are contacted and connected with the injection push plate 14 fixedly provided at one end of the injection push rod 13 extending out of the medicine liquid core tube 6.

[0041] The end of the medicine liquid core tube 6 at the position of the liquid outlet 10 is coaxially provided with a liquid outlet tube 11 outwardly, and the tube mouth of the liquid outlet tube 11 is sealed and fixed with a rubber membrane 15. The end of the medicine liquid core tube 6 at the position of the liquid outlet 10 is located outside the liquid outlet tube 11 and coaxially provided with a connecting tube 16, and an annular connecting groove 17 is formed between the connecting tube 16 and the liquid outlet tube 11. The edge of the end of the needle tube mounting plate 8 on which the needle tube 7 is fixed at the axis facing the medicine liquid core tube 6 is coaxially provided with a clamping ring 36, and the needle tube mounting plate 8 is clamped on the ring The clamping ring 36 in the annular connecting groove 17 is fixedly connected to the medicine liquid core tube 6, and the two ends of the needle tube 7 extend out of the two opposite side end surfaces of the needle tube mounting plate 8 respectively. When the end of the clamping ring 36 facing the medicine liquid core tube 6 just extends into the notch position of the annular connecting groove 17, the end of the needle tube 7 facing the medicine liquid core tube 6 is located below the rubber membrane 15. When the end of the clamping ring 36 facing the medicine liquid core tube 6 moves upward until it is clamped and fixed with the annular connecting groove 17, the end of the needle tube 7 facing the medicine liquid core tube 6 passes through the rubber membrane 15 and extends into the liquid outlet pipe 11.

[0042] The inner groove wall of the annular connecting groove 17 is a conical arc surface inclined toward the axis from bottom to top, the outer wall of the clamping ring 36 matches the inner groove wall of the annular connecting groove 17, and a rubber pad layer 19 is fixedly provided on the inner groove wall surface of the annular connecting groove 17.

[0043] An annular groove 18 is coaxially provided on the upper outer wall of the liquid outlet pipe 11 , and the annular elastic band provided on the edge of the rubber membrane 15 is fixedly connected in the annular groove 18 through the contraction restoring force, and the rubber membrane 15 is tensioned and wrapped around the bottom of the liquid outlet pipe 11 .

[0044] The syringe needle cover 22 is coaxially arranged at the axis of the connecting cover 37. The mouth of the connecting cover 37 faces upward and faces the liquid medicine core tube 6. The syringe needle cover 22 is located at the bottom of the connecting cover 37 and is communicated with the connecting cover 37. An annular connecting plate 38 is coaxially arranged outside the edge of the connecting cover 37. At the position of the mouth of the inner wall of the connecting cover 37, multiple spiral arc-shaped protrusions 39 are evenly distributed around the axis. An external thread B40 is arranged on the outer edge of the annular connecting plate 38. An internal thread B34 matching the external thread B40 is arranged on the upper part of the inner wall of the sleeve 9. An external thread A31 matching the spiral arc-shaped protrusion 39 is arranged on the outer side wall of the connecting pipe 16. The external thread A31 is evenly distributed with a plurality of axially arranged notches 32 around the axis. The number and width of the notches 32 match the spiral arc-shaped protrusion 39. When the connecting cover 37 contacts the external thread A31 at the bottom opening position of the liquid outlet pipe 11 through the spiral arc-shaped protrusion 39 and is screwed to the position of the notch 32, at this time, the connecting cover 37 just pushes up the snap ring 36 of the syringe needle mounting plate 8 to be clamped in the fixed annular connecting groove 17. The pitch of the external thread A31 is equal to the pitch of the internal thread B34.

[0045] An annular positioning groove 41 is arranged on the edge of the end face of the syringe needle mounting plate 8 on the side facing away from the liquid medicine core tube 6. A matching positioning convex ring 42 is arranged on the edge of the syringe needle cover 22 corresponding to the annular positioning groove 41. The positioning convex ring 42 is in positioning contact connection with the annular positioning groove 41.

[0046] The outer side wall of the syringe needle cover 22 is provided with screwing anti-slip lines.

[0047] A limiting convex ring 35 is coaxially arranged in the middle of the inner wall of the sleeve 9. The internal thread B34 extends downward to the top of the limiting convex ring 35.

[0048] The inner wall radius of the sleeve 9 is smaller than the distance between the bottom of the axial limiting groove 20 and the axis of the liquid medicine core tube 6. The inner wall and both side walls of the axial limiting rod 30 are respectively in contact with the bottom and side walls of the axial limiting groove 20.

[0049] On the inner side wall of the injection tube 2, a plurality of axially guiding convex rods 24 are evenly arranged around the axis corresponding to the axial limiting groove 20. The axially guiding convex rods 24 respectively extend to be flush with both ends of the injection tube 2. The distance between the inner wall of the axially guiding convex rod 24 and the axis is equal to the distance between the outer wall of the axial limiting rod 30 and the axis. The two side walls of the axially guiding convex rod 24 are respectively in contact with the two side walls of the corresponding axial limiting groove 20. The limiting head 25 is located at the position between two adjacent axially guiding convex rods 24. An axially guiding groove 29 matching the axially guiding convex rod 24 is arranged on the outer side wall of the pressing block 3.

[0050] The inner wall of the axially guiding convex rod 24 is provided with an anti-slip coating.

[0051] The material of the anti-slip coating is a polyurethane anti-slip coating.

[0052] The distance between the inner wall of the axial guiding convex rod 24 and the axis and the distance between the outer wall of the axial limiting rod 30 and the axis are in transition fit.

[0053] The limiting head 25 is connected to one end of the limiting swing rod 26. The limiting swing rod 26 is swingably connected to the outer side wall of the injection tube 2 through a swing shaft. The limiting swing rod 26 is connected to the injection tube 2 through a spring with a pre-applied force. Under the action of the spring, the limiting swing rod 26 makes the limiting head 25 penetrate through the side wall of the injection tube 2 and extend inward into the lumen 23. When pressing one end of the limiting swing rod 26 away from the limiting head 25, the limiting swing rod 26 overcomes the action of the spring and swings around the swing shaft until the limiting head 25 retracts into the tube wall of the injection tube 2.

[0054] A pressing groove 27 is provided on the outer side wall of the injection tube 2 corresponding to the position of the limiting swing rod 26. The two ends of the swing shaft of the limiting swing rod 26 are respectively connected to the two opposite side groove walls of the pressing groove 27. The limiting head 25 penetrates through the tube wall of the injection tube 2 from the bottom of the pressing groove 27.

[0055] A spring with a pre-pressure is provided between the end of the limiting swing rod 26 away from the limiting head 25 and the corresponding end of the bottom of the pressing groove 27.

[0056] A guiding convex ring 28 is provided coaxially with the top edge of the pressing block 3. The outer side wall of the guiding convex ring 28 is in contact with the inner wall of the injection tube 2. The axial guiding groove 29 penetrates upward through the top of the outer side wall of the guiding convex ring 28. The axial rod 4 is located inside the guiding convex ring 28.

[0057] The push plate 5 is larger than the range of the lumen 23 of the injection tube 2.

[0058] Combined Figures 3 to 13It can be seen that the production and preparation process of the injection unit 1 of the present application is as follows. First, the injection push block 12 in the liquid medicine core tube 6 is moved to the end where the liquid outlet pipe 11 is located through the injection push plate 14; then, insulin is injected into the liquid medicine core tube 6 through the bottom opening of the liquid outlet pipe 11. As the insulin is injected, the injection push block 12 gradually moves to the end away from the liquid outlet pipe 11; then, the bottom opening of the liquid outlet pipe 11 is sealed by the rubber membrane 15, and the annular rubber band provided at the edge of the rubber membrane 15 is fixedly connected to the annular groove 18 provided on the outer side wall of the liquid outlet pipe 11 through the contraction restoring force; in addition, the connection cover 37 with the cover opening facing upward is connected to the top opening of the sleeve 9. The connection cover 37 is threadedly connected to the internal thread B34 provided on the upper part of the inner wall of the sleeve 9 through the external thread B40 of the annular connection plate 38, and the annular connection plate 38 is moved downward to be in limit contact with the limit convex ring 35 provided on the inner wall of the sleeve 9; then, the annular positioning groove 41 of the syringe mounting plate 8 is placed in positioning connection with the positioning convex ring 42 of the connection cover 37; then, the liquid medicine core tube 6 is placed and connected to the top of the sleeve 9, and the axial limiting rods 30 are respectively circumferentially limited corresponding to the axial limiting grooves 20 provided on the side wall of the liquid medicine core tube 6. At this time, the top end of the axial limiting rod 30 is in contact connection with the bottom surface of the injection push plate 14; finally, the annular cover 22 is screwed upward so that the spiral arc-shaped protrusion 39 of the connection cover 37 is just threadedly connected to the bottom of the external thread A31 of the connecting pipe 16 provided at the bottom of the liquid medicine core tube 6. Thus, the preparation of the injection unit 1 is completed.

[0059] Combined with Figures 1 to 13It can be known that when the present application is ready to be used, first take out the pressing block 3 upward from the top of the injection tube 2. At this time, the lumen 23 of the injection tube 2 is empty. Then, first place an injection unit 1 into the lumen 23 from the top of the injection tube 2, and make the axial limiting groove 20 and the axial guiding groove 29 of the injection unit 1 respectively match the corresponding axial guiding convex rods 24. At this time, the injection unit 1 slowly slides downward under the circumferential limitation of the axial guiding convex rods 24 until the bottom edge of the liquid medicine core tube 6 of the injection unit 1 is blocked and limited by the limiting head 25. If you think the sliding speed of the injection unit 1 is relatively slow, you can quickly shake the injection tube 2 back and forth slightly to make the injection unit 1 slide down as soon as possible until it is blocked and limited by the limiting head 25. Then place your finger on the bottom nozzle of the injection tube 2, and then press the limiting swing rod 26 to make the limiting head 25 retract into the tube wall of the injection tube 2. At this time, the injection unit 1 in the injection tube 2 can continue to move downward because there is no limitation of the limiting head 25. After the injection unit 1 continues to move downward, release the limiting swing rod 26 to make the limiting head 25 extend into the tube wall of the injection tube 2 again and contact the corresponding position on the side wall of the sliding injection unit 1. During the sliding process of the injection unit 1, when it contacts the finger at the bottom nozzle of the injection tube 2, the finger only prevents the injection unit 1 from falling off and separating from the bottom port of the injection tube 2, and does not limit or prevent the injection unit 1 from continuing to slide down. When the injection unit 1 slides to the position where the annular limiting groove 21 corresponds to the limiting head 25, the limiting head 25 will directly extend into the annular limiting groove 21 under the restoring force of the spring, so as to realize the axial limiting and fixing of the injection unit 1. Then, place multiple injection units 1 into the lumen 23 from the top nozzle of the injection tube 2 in sequence, so that after multiple injection units 1 are successively contacted and connected from bottom to top in the lumen 23, the bottom edges of the tube sleeves 9 of the injection units 1 placed later respectively contact the top surfaces of the injection push plates 14 of the adjacent injection units 1 below. Finally, place the pressing block 3 into the lumen 23 from the top nozzle of the injection tube 2. At this time, the pressing block 3 completely extends into the lumen 23, and the bottom of the pressing block 3 contacts the top surface of the injection push plate 14 of the uppermost injection unit 1 in the lumen 23.

[0060] Combined with Figures 3 to 7 、 Figure 14 and Figure 15It can be known that when the present application needs to be used by injection, by screwing the syringe cap 22 of the lowermost injection unit 1 in the injection tube 2 upward, the syringe cap 22 is moved upward, and then the syringe mounting plate 8 drives the syringe 7 to move upward axially. When the syringe cap 22 is screwed to the position where the spiral arc-shaped protrusion 39 is aligned with the notch 32 of the external thread A31, the connecting cover 37 just pushes the snap ring 36 of the syringe mounting plate 8 upward to be clamped in the fixed annular connecting groove 17. At this time, the top end of the syringe 7 pierces the rubber membrane 15 provided at the bottom opening of the liquid outlet tube 11 of the liquid medicine core tube 6 during the upward movement of the syringe mounting plate 8. And due to the action of the external thread B40 and the internal thread B34 of the sleeve 9, the annular connecting plate 38, the connecting cover 37 and the syringe cap 22 move upward relative to the sleeve 9. During this process, the sleeve 9 of the lowermost injection unit 1 in the injection tube 2 remains stationary relative to the liquid medicine core tube 6. Then, since the spiral arc-shaped protrusion 39 is exactly located at the notch 32 of the external thread A31, the syringe cap 22 is moved downward axially, so that the syringe cap 22 is separated from the syringe mounting plate 8 fixed to the liquid medicine core tube 6, and at the same time drives the sleeve 9 to move downward axially. Continue to move the syringe cap 22 and the sleeve 9 downward axially until the axial limiting rod 30 moves downward to be completely separated from the axial limiting groove 20 of the liquid medicine core tube 6. At this time, the injection push plate 14 of the liquid medicine core tube 6 of the lowermost injection unit 1 in the injection tube 2 is no longer axially restricted by the axial limiting rod 30. At this time, the syringe 7 of the liquid medicine core tube 6 is just exposed, so that injection can be carried out. The syringe 7 at the bottom of the injection tube 2 is punctured and inserted into the subcutaneous position of the patient's injection site. Then, when injecting, by pressing the push plate 5, the pressing block 3 is driven to move downward axially along the injection tube 2, and then drives the remaining injection units 1 in the injection tube 2 and the injection push plate 14 of the lowermost injection unit 1 to move downward axially. Further, the injection push block 12 in the liquid medicine core tube 6 of the lowermost injection unit 1 in the injection tube 2 injects the insulin in the liquid medicine core tube 6 into the patient's body. After the injection is completed, the syringe 7 inserted into the subcutaneous position of the patient is directly pulled out through the injection tube 2.

[0061] Combined with Figure 16 and Figure 17It can be seen that after the injection of this application is completed, the bottom opening of the injection tube 2 is oriented towards the medical waste recycling device, and then the limit swing rod 26 is pressed again to retract the limit head 25 into the tube wall of the injection tube 2. At this time, the injection unit 1 in the injection tube 2 can continue to move downward because there is no longer the limit of the limit head 25. Then, the push plate 5 is pressed to drive all the injection units 1 in the injection tube 2 downward by the pressing block 3. After the injection unit 1 continues to move downward, the limit swing rod 26 is released to make the limit head 25 extend inward into the tube wall of the injection tube 2 again and contact the corresponding position on the side wall of the downward-sliding injection unit 1 until the lowermost injected injection unit 1 separates from the bottom opening of the injection tube 2 and drops into the medical waste recycling device; continue to press the push plate 5 to make the pressing block 3 continue to drive the remaining injection units 1 in the injection tube 2 to move downward. When the bottom edge of the liquid medicine core tube 6 of the lowermost injection unit 1 in the injection tube 2 is blocked and limited by the limit head 25, then place the finger on the bottom nozzle of the injection tube 2 again, and then press the limit swing rod 26 again to retract the limit head 25 into the tube wall of the injection tube 2. At this time, the injection unit 1 in the injection tube 2 can continue to move downward because there is no longer the limit of the limit head 25. Continue to press the push plate 5 to make the pressing block 3 continue to drive the remaining injection units 1 in the injection tube 2 to move downward. After the injection unit 1 continues to move downward, the limit swing rod 26 is released to make the limit head 25 extend inward into the tube wall of the injection tube 2 again and contact the corresponding position on the side wall of the lowermost injection unit 1. When the lowermost injection unit 1 contacts the finger at the bottom nozzle of the injection tube 2 during the downward movement, the finger only prevents the lowermost injection unit 1 from falling and separating from the bottom opening of the injection tube 2 and does not limit or prevent the continued downward movement of the lowermost injection unit 1; when the lowermost injection unit 1 moves downward to the position where the annular limit groove 21 corresponds to the limit head 25, the limit head 25 will directly extend into the annular limit groove 21 under the restoring force of the spring, thereby realizing the axial limit and fixation of the injection unit 1.

[0062] During the whole process, the user will not contact the syringe 7, thus avoiding the user accidentally contacting the syringe 7 when replacing the injection unit, and further avoiding the user being injured by the syringe 7 or contacting the blood on the syringe 7.

[0063] The injection unit 1 itself can also be used directly alone without passing through the injection tube 2, which is convenient for carrying and is beneficial for diabetic patients to inject themselves at home or during travel.

[0064] When the injection unit 1 is used alone, it is suitable for the situation where the patient uses it by himself / herself, such as when only one injection is required within the same period of time without multiple injections.

[0065] The injection unit 1 is used for injection through the injection tube 2, and is applicable to situations in hospitals or convalescent care units where multiple patients need to be injected separately within a certain period of time. There is no need to separately load the injection unit each time an injection is made, nor is there a need to separately spend time replacing the needle each time an injection is made.

[0066] The injection unit 1 can obtain the liquid medicine core tube 6 filled with different amounts of insulin only by setting different axial lengths of the liquid medicine core tube 6, so that different dosages of insulin can be used according to different conditions.

[0067] Through the structures of the connection cover 37 of the injection unit 1, the sleeve 9, the syringe tube connecting plate 8, and the liquid medicine core tube 6, the exposure of the syringe tube 7 and the unlocking of the injection push plate 14 can be simultaneously achieved by separating the sleeve 9 from the liquid medicine core tube 6.

[0068] The injection unit 1 used for each injection is disposable. After each injection, a new injection unit 1 is replaced for injection, so as to ensure that the insulin injected each time can avoid the hidden danger of being contaminated and can fully ensure safety.

Claims

1. An insulin syringe with automatic needle change, characterized in that: The invention comprises an injection tube (2), wherein an injection unit (1) is sequentially contacted and connected in a tube cavity (23) of the injection tube (2) along the axial direction of the injection tube (2), wherein a pressing block (3) matching the inner wall of the tube cavity (23) of the injection tube (2) is provided at the upper end of the injection tube (2), an axial push rod (4) provided at the top of the pressing block (3) extends upward out of the tube cavity (23), and a push plate (5) is fixed to one end of the axial rod (4) extending out of the tube cavity (23), and a limiting head (25) for axially limiting the lowermost injection unit (1) in the tube cavity (23) is provided at the lower end of the side wall of the injection tube (2), and the injection unit (1) comprises a liquid medicine core tube (6), and the side wall of the liquid medicine core tube (6) is coaxially provided with a limiting head (25) which is connected to the limiting head (25) 5) a matching annular limiting groove (21), the liquid outlet (10) provided at the axial center of one end of the liquid medicine core tube (6) is detachably fixedly connected to the needle tube (7), the other end of the liquid medicine core tube (6) is provided with an injection push block (12), the injection push block (12) extends out of the connecting hole (33) of the liquid medicine core tube (6) through an injection push rod (13), the liquid medicine core tube (6) corresponding to the end where the needle tube (7) is located is also detachably fixedly connected to a needle tube protection device that simultaneously axially limits the injection push rod (13), the end where the needle tube (7) of the injection unit (1) in the tube cavity (23) is located faces downward, and the needle tube (7) of the lowest injection unit (1) in the tube cavity (23) is limited by the limiting head (25) and extends downwardly out of the injection tube (2).

2. The insulin syringe with automatic needle change as claimed in claim 1, characterized in that: The needle tube protection device comprises a sleeve (9), the inner wall of the sleeve (9) is detachably fixedly connected to a needle tube cover (22), the bottom end of the needle tube (7) is located above the needle tube cover (22) fixedly connected to the sleeve (9), a plurality of axial limit rods (30) are evenly arranged on the outer edge of the top tube opening of the sleeve (9), the needle tube cover (22) is detachably fixedly connected to the end of the corresponding liquid medicine core tube (6) provided with a liquid outlet (10), and the side wall of the liquid medicine core tube (6) corresponds to the axial limit rod (30). ) positions, respectively provided with corresponding axial limit grooves (20), the axial limit grooves (20) respectively penetrating through the two ends of the side wall of the medicine liquid core tube (6), and when the sleeve (9) is fixedly connected to the medicine liquid core tube (6) through the needle tube cover (22), the axial limit rods (30) are respectively correspondingly located in the axial limit grooves (20), and the top ends of the axial limit rods (30) respectively extend upwards out of the axial limit grooves (20) and contact and connect with the injection push plate (14) fixedly provided with one end of the injection push rod (13) extending out of the medicine liquid core tube (6).

3. The insulin syringe with automatic needle change as claimed in claim 2, characterized in that: The end of the liquid core tube (6) at the location of the liquid outlet (10) is provided with a liquid outlet tube (11) coaxially outwardly, and the tube mouth of the liquid outlet tube (11) is sealed and fixed with a rubber membrane (15). The end of the liquid core tube (6) at the location of the liquid outlet (10) is provided with a connecting tube (16) coaxially outside the liquid outlet tube (11), and an annular connecting groove (17) is formed between the connecting tube (16) and the liquid outlet tube (11). A needle tube mounting plate (8) to which a needle tube (7) is fixed at the axis is provided with a clamping ring (36) coaxially at the edge of the end on one side facing the liquid core tube (6), and the needle tube mounting plate (8) is clamped on the annular connecting groove (17). The clamping ring (36) in the connecting groove (17) is fixedly connected to the liquid medicine core tube (6), and the two ends of the needle tube (7) extend out of the two opposite side end surfaces of the needle tube mounting plate (8). When the end of the clamping ring (36) facing the liquid medicine core tube (6) just extends into the notch position of the annular connecting groove (17), the end of the needle tube (7) facing the liquid medicine core tube (6) is located below the rubber membrane (15). When the end of the clamping ring (36) facing the liquid medicine core tube (6) moves upward to be clamped and fixed with the annular connecting groove (17), the end of the needle tube (7) facing the liquid medicine core tube (6) passes through the rubber membrane (15) and extends into the liquid outlet tube (11).

4. The insulin syringe with automatic needle change as claimed in claim 3, characterized in that: The inner groove wall of the annular connecting groove (17) is a conical arc surface that is inclined from bottom to top toward the axis, the outer wall of the clamping ring (36) matches the inner groove wall of the annular connecting groove (17), and a rubber cushion layer (19) is fixedly provided on the surface of the inner groove wall of the annular connecting groove (17).

5. The insulin syringe with automatic needle change as claimed in claim 3, characterized in that: The needle tube cover (22) is coaxially arranged at the axis center of the connecting cover (37); the cover opening of the connecting cover (37) faces upward and faces the medicine liquid core tube (6); the needle tube cover (22) is located at the bottom of the connecting cover (37), and the needle tube cover (22) is connected to the connecting cover (37); an annular connecting plate (38) is coaxially arranged outwardly along the cover edge of the connecting cover (37); a plurality of spiral arc-shaped protrusions (39) are evenly distributed at the cover opening position of the inner wall of the connecting cover (37) with the axis center as the center; an outer edge of the annular connecting plate (38) is provided with an external thread B (40); an inner thread B (34) matching the external thread B (40) is provided on the upper part of the inner wall of the sleeve (9); The outer wall of the connecting pipe (16) is provided with an external thread A (31) matching with the spiral arc-shaped protrusion (39), and the external thread A (31) is evenly distributed with a plurality of axially arranged notches (32) centered on the axis, and the number and width of the notches (32) match with the spiral arc-shaped protrusion (39). When the connecting cover (37) contacts the external thread A (31) at the bottom of the liquid outlet pipe (11) through the spiral arc-shaped protrusion (39) and is screwed to the position of the notch (32), the connecting cover (37) just pushes the clamping ring (36) of the needle tube mounting plate (8) upward to be clamped in the fixed annular connecting groove (17), and the pitch of the external thread A (31) is equal to the pitch of the internal thread B (34).

6. The insulin syringe with automatic needle change as claimed in claim 5, characterized in that: An annular positioning groove (41) is provided at the edge of the end surface of the needle tube mounting plate (8) facing away from the medicine liquid core tube (6), and a matching positioning convex ring (42) is provided at the cover edge of the needle tube cover (22) corresponding to the annular positioning groove (41), and the positioning convex ring (42) is in positioning contact connection with the annular positioning groove (41).

7. The insulin syringe with automatic needle change as claimed in claim 5, characterized in that: A limiting convex ring (35) is coaxially provided in the middle of the inner wall of the sleeve (9), and the internal thread B (34) extends downward to the top of the limiting convex ring (35).

8. The insulin syringe with automatic needle change as claimed in claim 5, characterized in that: The inner wall radius of the sleeve (9) is smaller than the distance between the bottom of the axial limit groove (20) and the axis of the liquid medicine core tube (6), and the inner wall and the two side walls of the axial limit rod (30) are respectively correspondingly fitted with the bottom and the side walls of the axial limit groove (20).

9. The insulin syringe with automatic needle change as claimed in claim 2, characterized in that: The inner side wall of the injection tube (2) is evenly provided with a plurality of axial guide protrusions (24) corresponding to the axial limit groove (20) with the axis as the center. The axial guide protrusions (24) extend to be flush with both ends of the injection tube (2). The distance between the inner wall of the axial guide protrusion (24) and the axis is equal to the distance between the outer wall of the axial limit rod (30) and the axis. The two side walls of the axial guide protrusion (24) are respectively fitted with the two side walls of the corresponding axial limit groove (20). The limit head (25) is located between two adjacent axial guide protrusions (24). The outer side wall of the pressure block (3) is provided with a matching axial guide groove (29) corresponding to the axial guide protrusion (24).

10. The insulin syringe with automatic needle change as claimed in claim 1, characterized in that: The limit head (25) is connected to one end of a limit swing rod (26), and the limit swing rod (26) is swingably connected to the outer wall of the injection tube (2) via a swing shaft. The limit swing rod (26) is connected to the injection tube (2) via a spring provided with a preload force. Under the action of the spring, the limit swing rod (26) causes the limit head (25) to pass through the side wall of the injection tube (2) and extend inwardly into the tube cavity (23). When one end of the limit swing rod (26) is pressed away from the limit head (25), the limit swing rod (26) overcomes the action of the spring and swings around the swing shaft until the limit head (25) retracts into the tube wall of the injection tube (2).

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