Needle stick resistant positive pressure intravenous catheter assembly

Abstract

The present application relates to the technical fields of intravenous indwelling needle, especially to the positive pressure type intravenous indwelling needle assembly, comprising a needle structure, an indwelling hose is connected to one side of the needle structure, characterized in that: a first anti-reflux pre-pressing unit is connected to the liquid inlet end of the indwelling hose, one side of the first anti-reflux pre-pressing unit is connected to an infusion connection unit, the infusion connection unit is connected to the infusion tube of an external infusion device and delivers the liquid medicine into the human body through the indwelling hose, a second anti-reflux spinning unit is installed at the rear end of the needle structure, and a third tube sealing anti-reflux unit is installed on the indwelling hose. The positive pressure type intravenous indwelling needle assembly adopts the anti-reflux mode of positive pressure to effectively prevent the blood from flowing back to the inside of the needle structure and the indwelling hose by using the positive pressure after the infusion tube is pulled out, effectively reduces the thrombosis problem caused by blood reflux, and is safer and more reliable in use.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of intravenous indwelling needle, in particular to a new intravenous indwelling needle structure capable of realizing multiple positive pressure anti-reflow, especially a needle-sticking prevention positive pressure type intravenous indwelling needle assembly. BACKGROUND

[0002] The intravenous indwelling needle has been widely used in clinical treatment due to its advantages of reducing blood vessel damage, alleviating patient pain, and being conducive to treatment and rescue. There are many types of indwelling needle structures in the prior art. For example, a patent application No. CN201821812973.5 discloses an indwelling needle, which mainly comprises a mounting seat and an extension pipe. The mounting seat is mounted on the extension pipe. The extension pipe is provided with a timing device. The timing device is used to display the indwelling time of the indwelling needle. The timing device comprises a timing turntable. The timing turntable is rotatably mounted on the mounting seat. The timing turntable is provided with a timing scale. The mounting seat is provided with a reading pointer corresponding to the timing scale.

[0003] For another example, a patent application No. CN201922187392.8 also discloses a new type of indwelling needle. The main structure of the indwelling needle comprises an indwelling needle and a puncture steel needle inserted into the indwelling needle body. The bottom of the indwelling needle body is provided with a needle seat. The needle seat comprises a soft rubber patch adhered to the skin, a clamping seat fixed on the top of the soft rubber patch, a plurality of fixed strips on the surface of the soft rubber patch on one side of the clamping seat, and a hanging plate on the surface of the soft rubber patch on the other side of the clamping seat. The indwelling needle body is clamped on the top of the clamping seat. The head portion of the fixed strip is provided with a hanging hole. The fixed strip is hung on the hanging plate through the hanging hole after passing over the top of the indwelling needle body.

[0004] From the above two prior arts, it can be seen that the first prior art patent mainly adds a timing device to measure the indwelling time of the indwelling needle. The second prior art mainly adds a soft rubber patch to disperse the pressure stress generated on the patient's skin after the indwelling needle is fixed on the patient's skin by the adhesive film, so as to avoid local skin swelling, infection, or damage of the patient, prevent pressure sores, and improve the safety and comfort of the indwelling needle. From the structure, it can be seen that the main body of the indwelling needle still adopts the traditional intravenous indwelling needle structure. After the tube is pulled out, the heparin needs to be injected regularly to avoid the risk of blood coagulation and thrombosis in the indwelling needle. However, multiple injections of heparin increase the nursing work and cause great inconvenience to the patient.

[0005] In addition, the use of ordinary indwelling needle infusion repeatedly puncture heparin cap, increase the risk of infusion particles into the infusion system, and improper sealing tube, heparin cap in the blood also easy to increase the incidence of infection.

[0006] To this end, the present application proposes a new improved scheme, hereby designed a new positive pressure intravenous catheter structure can realize multiple positive pressure anti-reflux, in order to better solve the problems existing in the prior art. SUMMARY

[0007] To solve the above technical problems, the technical scheme adopted by the present application is: a needle-sticking prevention positive pressure type intravenous catheter assembly, comprising a needle structure, a catheter tube connected to one side of the needle structure, a first anti-reflux pre-pressing unit connected to the inlet end of the catheter tube, a liquid infusion connecting unit connected to one side of the first anti-reflux pre-pressing unit, the liquid infusion connecting unit being connected to the infusion tube of an external infusion device and conveying the liquid medicine into the human body through the catheter tube, a second anti-reflux rotary pressing unit installed at the rear end of the needle structure, and a third catheter sealing anti-reflux unit installed on the catheter tube, wherein the first anti-reflux pre-pressing unit, the second anti-reflux rotary pressing unit, and the third catheter sealing anti-reflux unit cooperate to realize three-stage positive pressure sealing to prevent blood from flowing back to the inside of the needle structure after infusion is completed.

[0008] Preferably, in any of the above schemes, the first anti-reflux pre-pressing unit comprises a first positive pressure tube integrally connected to the inlet end of the catheter tube, an external thread is provided on the upper outer side wall of the first positive pressure tube, a first screw sealing cap is screwed onto the external thread segment of the outer side wall of the first positive pressure tube, a first pre-pressing plug is installed in the first cavity of the first positive pressure tube, a light pressure spring is fixedly installed on the top of the first pre-pressing plug, and the top of the light pressure spring is fixedly installed on the first screw sealing cap.

[0009] Preferably, in any of the above schemes, the bottom of the first pre-pressing plug is a downwardly protruding convex spherical surface.

[0010] Preferably, in any of the above schemes, the liquid infusion connecting unit comprises a connecting elbow integrally formed on one side of the lower part of the first positive pressure tube, a liquid infusion connecting tube is fixedly installed on the top of the connecting elbow, an external thread connecting port is provided on the inlet end of the liquid infusion connecting tube, the external thread connecting port is used to connect with the external infusion tube, and the outlet end channel of the connecting elbow is in communication with the first cavity below the first pre-pressing plug.

[0011] Preferably, in any of the above schemes, when the external thread connecting port is separated from the external infusion tube, a plugging cap is configured to plug and protect the external thread connecting port, and when the external thread connecting port is separated from the external infusion tube, the first pre-pressing plug plugs the outlet end channel of the connecting elbow under the elastic force of the light pressure spring.

[0012] Preferably in any of the above solutions, the second anti-backflow spinning unit comprises a second positive pressure tube integrally fixed at the rear end of the needle structure and connected with the inside thereof, a rubber channel ring fixedly installed in the second cavity of the second positive pressure tube, a moving piston movably and sealingly installed in the second cavity of the outer end of the rubber channel ring, a push disc fixedly installed at the inner end of the moving piston, an annular groove provided outside the connecting shaft between the inner end face of the moving piston and the push disc, a threaded column installed at the outer end of the moving piston, and the outer end of the threaded column outwardly screwed through the central threaded hole of the second blocking plug and extended to the outside of the second positive pressure tube, and the outer sidewall of the second blocking plug sealingly screwed on the inner sidewall of the second cavity of the second positive pressure tube.

[0013] Preferably in any of the above solutions, the third sealing tube anti-backflow unit is a sealing tube clamp clamped on the indwelling tube, and the closing of the sealing tube clamp realizes the positive pressure at the outlet end of the indwelling tube to achieve positive pressure anti-backflow.

[0014] Preferably in any of the above solutions, a needle holding handle is integrally formed on one side of the needle structure, a first adjusting knob is fixed on the top of the first screw sealing cap, and a second adjusting knob is fixedly installed at the center of the outer end face of the limiting disc of the threaded column.

[0015] Preferably in any of the above solutions, the thickness of the annular groove matches the thickness of the rubber channel ring, the outer diameter of the push disc is larger than the inner ring size of the rubber channel ring, when the threaded column is screwed inwardly, the push disc is passively driven to pass through the inner ring of the rubber channel ring and block the two sides of the rubber channel ring through the inner end face of the moving piston and the outer end face of the push disc on both sides of the annular groove, and when the push disc moves inwardly, the inside of the needle structure is under positive pressure and the backflow blood is pushed out of the needle structure to achieve positive pressure anti-backflow.

[0016] Compared with the prior art, the beneficial effects of the present application are as follows:

[0017] 1. The positive pressure type venous indwelling needle assembly of the present application adopts a positive pressure anti-backflow mode to effectively prevent blood backflow into the needle structure and the indwelling tube after the infusion tube is pulled out, effectively reduces the problem of thrombosis caused by blood backflow, and is safer and more reliable in use.

[0018] 2. The positive pressure type venous indwelling needle assembly of the present application relies on the cooperation of the first anti-backflow pre-pressing unit, the second anti-backflow spinning unit, and the third sealing tube anti-backflow unit to realize three-stage positive pressure sealing tube to prevent blood backflow into the needle structure, and the three-stage positive pressure structure better guarantees the anti-backflow effect.

[0019] 3. When the infusion tube or syringe is pulled out, three positive pressures can be generated according to the operation, so as to effectively push the liquid in the indwelling soft tube and needle structure forward, prevent blood from flowing back to the indwelling needle assembly, avoid the formation of thrombus, prevent blood backflow by the special anti-backflow design, effectively reduce the catheter blockage, and no need to repeatedly use the injection heparin sealing tube due to backflow during the needle retention period, so as to effectively reduce the nursing workload. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or components are generally identified by similar reference numerals. In the drawings, various elements or components are not necessarily drawn according to the actual scale.

[0021] Fig. 1 It is a structural schematic diagram of the present application.

[0022] Fig. 2 It is a partial internal sectional view structural schematic diagram of the present application.

[0023] Fig. 3 It is a partial enlarged structural schematic diagram of the present application.

[0024] In the drawings, 1, needle structure; 2, indwelling soft tube; 3, first positive pressure tube; 4, first screw seal cap; 5, first cavity; 6, first pre-pressing plug; 7, light pressure spring; 8, connecting elbow; 9, infusion connecting tube; 10, external thread connecting port; 11, outlet end passage; 12, second positive pressure tube; 13, second cavity; 14, rubber passage ring; 15, moving piston; 16, push disc; 17, connecting shaft; 18, annular groove; 19, threaded column; 20, second sealing plug; 21, sealing tube clamp; 22, needle holding handle; 23, first adjusting knob; 24, limiting disc; 25, second adjusting knob. EMBODIMENT

[0025] The embodiments of the technical solutions of the present application will be described in detail below in combination with the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application. The specific structure of the present application is shown in the drawings. Figs. 1-3 EMBODIMENT

[0026] ​The anti-needle-sticking positive pressure type venous indwelling needle assembly comprises a needle structure 1, an indwelling hose 2 connected to one side of the needle structure 1, a first anti-backflow pre-pressing unit connected to the liquid inlet end of the indwelling hose 2, a transfusion connecting unit connected to one side of the first anti-backflow pre-pressing unit, the transfusion connecting unit being connected with a transfusion tube of an external transfusion device and delivering the liquid medicine into the human body through the indwelling hose 2, a second anti-backflow spinning unit installed at the rear end of the needle structure 1, and a third tube sealing anti-backflow unit installed on the indwelling hose 2, wherein the first anti-backflow pre-pressing unit, the second anti-backflow spinning unit and the third tube sealing anti-backflow unit cooperate to realize three-stage positive pressure tube sealing to prevent the blood from flowing back to the inside of the needle structure 1 after the transfusion is completed. The anti-needle-sticking positive pressure type venous indwelling needle assembly of the present application can first realize one-stage automatic positive pressure to push the liquid in the needle structure 1 outwards to realize one-stage positive pressure protection after the syringe or the transfusion tube is pulled out compared with the conventional venous indwelling needle. In addition, in order to further ensure the safety of the tube sealing, the second anti-backflow spinning unit can be operated again to realize two-stage positive pressure micro-push on the needle structure 1, so that the liquid in the needle structure 1 can be pushed outwards again to realize two-stage positive pressure protection. Finally, the third tube sealing anti-backflow unit can be manually operated according to the need to realize three-stage positive pressure liquid pushing of the indwelling hose 2. After the liquid is pushed, a liquid bead will be formed at the end of the needle structure 1 due to the surface tension of the liquid, so that the blood can be effectively prevented from flowing back into the device, the backflow prevention effect is improved, and multi-stage positive pressure tube sealing is effectively realized.

[0027] In any of the above schemes, preferably, the first anti-backflow pre-pressing unit comprises a first positive pressure pipe 3 integrally connected to the inlet end of the indwelling hose 2, an outer thread is provided on the upper outer side wall of the first positive pressure pipe 3, a first screw sealing cap 4 is screwed on the outer thread segment of the outer side wall of the first positive pressure pipe 3, a first pre-pressing plug 6 is sealingly installed in the first cavity 5 of the first positive pressure pipe 3, a light pressure spring 7 is fixedly installed on the top of the first pre-pressing plug 6, and the top of the light pressure spring 7 is fixed on the first screw sealing cap 4. The main functions of the first anti-backflow pre-pressing unit are as follows: first, when normal infusion is performed, due to the existence of certain infusion pressure, after the infusion liquid flows into the first cavity 5, it will press the first pre-pressing plug 6 and the indwelling hose 2, on one hand, it will make the liquid flow into the patient's vein with certain pressure, and on the other hand, it will make the first pre-pressing plug 6 push the light pressure spring 7 to be compressed and deformed and remain in the compressed state; second, the compression amplitude of the light pressure spring 7 in the pre-state can be adjusted by screwing the first screw sealing cap 4; third, after the tube is pulled out, the reset spring of the light pressure spring 7 with increased compression amplitude drives the first pre-pressing plug 6 to move inward and seal the outlet end passage 11 of the connection elbow 8 of the infusion connection unit; fourth, the first pre-pressing plug 6 drives the indwelling hose 2 to be positively sealed while moving inward, and the inlet is also sealed, and after sealing, the outer thread connection port 10 on the infusion connection unit is sealed by a matched sealing cap.

[0028] In any of the above schemes, preferably, the infusion connection unit comprises a connection elbow 8 integrally formed on one side of the lower part of the first positive pressure pipe 3, an infusion connection pipe 9 is fixed on the top of the connection elbow 8, an outer thread connection port 10 is provided on the inlet end of the infusion connection pipe 9, the outer thread connection port 10 is used to connect with an external infusion pipe, and the outlet end passage 11 of the connection elbow 8 communicates with the first cavity 5 below the first pre-pressing plug 6. The infusion connection unit connects with an external infusion pipe or a syringe through the outer thread connection port 10, the liquid with pressure enters the connection elbow 8 through the inlet end of the infusion connection pipe 9, then enters the first cavity 5 through the outlet end passage 11 of the connection elbow 8, then enters the indwelling hose 2 and the needle structure 1 through the first cavity 5, and finally flows into the human vein.

[0029] In any of the above solutions, it is preferred that when the external threaded connection port 10 is separated from the external infusion tube, a plug cap is arranged to seal and protect it, and when the external threaded connection port 10 is separated from the external infusion tube, the first pre-pressing plug 6 is sealed and protected under the elastic force of the light pressure spring 7 to seal the outlet end channel 11 of the connection elbow 8. After the tube is pulled out, the light pressure spring 7 with increased compression force drives the first pre-pressing plug 6 to move inward and seal the outlet end channel 11 of the connection elbow 8 of the infusion connection unit.

[0030] In any of the above solutions, it is preferred that the second anti-backflow spinning unit includes a second positive pressure tube 12 integrally fixed to the rear end of the needle structure 1 and connected to the inside thereof, a rubber channel ring 14 fixedly installed in the second cavity 13 of the second positive pressure tube 12, a moving piston 15 movably and sealingly installed in the second cavity 13 at the outer end of the rubber channel ring 14, a push disc 16 fixedly installed at the inner end of the moving piston 15, an annular groove 18 provided on the outer side of the connecting shaft 17 between the push disc 16 and the inner end face of the moving piston 15, a threaded column 19 installed at the outer end of the moving piston 15, the outer end of the threaded column 19 outwardly screwed through the center threaded hole of the second sealing plug 20 and extended to the outside of the second positive pressure tube 12, and the outer side wall of the second sealing plug 20 sealingly screwed on the inner side wall of the second cavity 13 of the second positive pressure tube 12. The second anti-backflow spinning unit mainly realizes further safety sealing after the first anti-backflow pre-pressing unit completes the positive pressure sealing tube. In operation, the moving piston 15 and the push disc 16 are driven to move inward by slightly screwing the threaded column 19, and finally the push disc 16 is forced to pass through the inner ring of the rubber channel ring 14 in a flexible state. Since the rubber channel ring 14 is made of flexible material and is temporarily expanded under the push, the push disc 16 passes through the inner ring of the rubber channel ring 14 in a deformed state. Then, the rubber channel ring 14 is sealed on both sides by the inner end face of the moving piston 15 and the outer end face of the push disc 16 on both sides of the annular groove 18. Since the push disc 16 is pushed inward, a certain positive pressure is formed in the inside of the needle structure 1 part, achieving the purpose of secondary positive pressure sealing tube.

[0031] In any of the above solutions, it is preferred that the third sealing tube anti-backflow unit is a sealing tube clamp 21 clamped on the indwelling tube 2, and closing the sealing tube clamp 21 forms a positive pressure at the outlet end of the indwelling tube 2 to achieve positive pressure anti-backflow. Pressing the clamping sealing tube clamp 21 can achieve sealing and clamping of the indwelling tube 2, thereby achieving the purpose of positive pressure sealing tube. Embodiment

[0032] The anti-needle-sticking positive pressure type venous indwelling needle assembly comprises a needle structure 1, an indwelling hose 2 connected to one side of the needle structure 1, a first anti-backflow pre-pressing unit connected to the liquid inlet end of the indwelling hose 2, a transfusion connecting unit connected to one side of the first anti-backflow pre-pressing unit, the transfusion connecting unit being connected to the transfusion tube of an external transfusion device and conveying the liquid medicine into the human body through the indwelling hose 2, a second anti-backflow rotary pressing unit installed at the rear end of the needle structure 1, and a third tube sealing anti-backflow unit installed on the indwelling hose 2, wherein the first anti-backflow pre-pressing unit, the second anti-backflow rotary pressing unit and the third tube sealing anti-backflow unit cooperate to realize three-stage positive pressure tube sealing to prevent blood backflow into the needle structure 1 after the completion of transfusion.

[0033] Compared with the conventional venous indwelling needle, the anti-needle-sticking positive pressure type venous indwelling needle assembly in the application can first realize one-stage automatic positive pressure by using the first anti-backflow pre-pressing unit to push the liquid in the needle structure 1 outward, thereby realizing one-stage positive pressure protection. In addition, in order to further ensure the safety of tube sealing, the second anti-backflow rotary pressing unit can be operated again to realize two-stage positive pressure micro-push on the needle structure 1, so as to push the liquid in the needle structure 1 outward again, thereby realizing two-stage positive pressure protection. Finally, the third tube sealing anti-backflow unit can be manually operated according to the need to realize three-stage positive pressure liquid pushing of the indwelling hose 2. After the liquid pushing, a liquid bead is formed at the end of the needle structure 1 due to the effect of the liquid surface tension, so as to finally achieve high-efficiency prevention of blood backflow into the device, improve the backflow prevention effect, and effectively realize multi-stage positive pressure tube sealing.

[0034] In any of the above solutions, preferably, the first anti-backflow pre-pressing unit comprises a first positive pressure tube 3 integrally connected to the inlet end of the indwelling hose 2, an outer thread is arranged on the upper outer side wall of the first positive pressure tube 3, a first rotary sealing cap 4 is screwed on the outer thread segment of the outer side wall of the first positive pressure tube 3, a first pre-pressing plug 6 is arranged in a first cavity 5 of the first positive pressure tube 3, a light pressure spring 7 is fixedly installed on the top of the first pre-pressing plug 6, and the top of the light pressure spring 7 is fixedly installed on the first rotary sealing cap 4.

[0035] The main functions of the first anti-backflow pre-pressing unit here are as follows: first, when normal infusion is performed, since there is a certain infusion pressure, after the infusion liquid flows into the first cavity 5, it will press the first pre-pressing plug 6 and the indwelling tube 2 to one side, on the one hand, it will make the liquid flow into the patient's vein with a certain pressure, and on the other hand, it will make the first pre-pressing plug 6 be pushed by the pressure to drive the light pressure spring 7 to appear a certain compression deformation and keep in a compressed state; second, the compression amplitude of the light pressure spring 7 in the pre-state can be adjusted by rotating and adjusting the tightening degree of the first rotating and sealing cap 4; third, after the tube is pulled out, the reset elastic force of the light pressure spring 7 with increased compression degree drives the first pre-pressing plug 6 to move inward and realize the sealing of the outlet end channel 11 of the connecting elbow 8 of the infusion connecting unit; fourth, the first pre-pressing plug 6 drives the indwelling tube 2 to be sealed under positive pressure while moving inward, and the sealing under positive pressure also realizes the sealing of the liquid inlet, and after the sealing, the outer threaded connecting port 10 on the infusion connecting unit is sealed by using the matched sealing cap.

[0036] In any of the above solutions, preferably, the bottom of the first pre-pressing plug 6 is a downwardly protruding convex spherical surface.

[0037] The structure of the convex spherical surface can realize a certain lifting separation of the infusion liquid when it enters, improve the effect of pushing the first pre-pressing plug 6 outward and compressing the light pressure spring 7.

[0038] In any of the above solutions, preferably, the infusion connecting unit comprises a connecting elbow 8 integrally formed on one side of the lower part of the first positive pressure tube 3, a infusion connecting tube 9 is fixed on the top of the connecting elbow 8, an outer threaded connecting port 10 is arranged at the inlet end of the infusion connecting tube 9, the outer threaded connecting port 10 is used for connecting with the external infusion tube, and the outlet end channel 11 of the connecting elbow 8 is in communication with the first cavity 5 below the first pre-pressing plug 6.

[0039] The infusion connecting unit connects with the external infusion tube or syringe through the outer threaded connecting port 10, the liquid with pressure enters the connecting elbow 8 through the inlet end of the infusion connecting tube 9, then enters the first cavity 5 through the outlet end channel 11 of the connecting elbow 8, enters the indwelling tube 2 and the needle structure 1 through the first cavity 5, and finally flows into the human vein.

[0040] In any of the above solutions, preferably, when the outer threaded connecting port 10 is separated from the external infusion tube, a sealing cap is configured to seal and protect it, and when the outer threaded connecting port 10 is separated from the external infusion tube, the first pre-pressing plug 6 seals the outlet end channel 11 of the connecting elbow 8 under the elastic force of the light pressure spring 7.

[0041] After the tube is pulled out, the first pre-press plug 6 is driven to move inward by the reset elastic force of the light compression spring 7 with increased compression strength, and the outlet end passage 11 of the connecting elbow 8 of the infusion connecting unit is blocked.

[0042] In any of the above schemes, preferably, the second anti-backflow spinning unit includes a second positive pressure pipe 12 integrally fixed at the rear end of the needle structure 1 and connected to the inside thereof, a rubber passage ring 14 fixedly installed in the second cavity 13 of the second positive pressure pipe 12, a moving piston 15 movably and sealingly installed in the second cavity 13 at the outer end of the rubber passage ring 14, a push disc 16 fixedly installed at the inner end of the moving piston 15, an annular groove 18 provided on the outer side of the connecting shaft 17 between the push disc 16 and the inner end face of the moving piston 15, a threaded column 19 installed at the outer end of the moving piston 15, the outer end of the threaded column 19 outwardly screwed through the center threaded hole of the second blocking plug 20 and extended to the outside of the second positive pressure pipe 12, and the outer side wall of the second blocking plug 20 sealingly screwed on the inner side wall of the second cavity 13 of the second positive pressure pipe 12.

[0043] The second anti-backflow spinning unit mainly realizes further safe sealing of the pipe after the first anti-backflow pre-pressing unit completes the positive pressure sealing of the pipe. In operation, the moving piston 15 and the push disc 16 can be driven to move inward by slightly screwing the threaded column 19, so that the push disc 16 is forced to pass through the inner ring of the rubber passage ring 14 in a flexible state. Since the rubber passage ring 14 is made of flexible material and is temporarily expanded after being pushed, the push disc 16 passes through the inner ring of the rubber passage ring 14 in a deformed state. Then, the rubber passage ring 14 is sealed on both sides by the inner end face of the moving piston 15 and the outer end face of the push disc 16 on both sides of the annular groove 18. Since the push disc 16 is pushed inward, a certain positive pressure is formed in the inside of the needle structure 1, achieving the purpose of secondary positive pressure sealing of the pipe.

[0044] In any of the above schemes, preferably, the third pipe sealing anti-backflow unit is a pipe sealing clamp 21 clamped on the indwelling hose 2, and closing the pipe sealing clamp 21 forms a positive pressure at the outlet end of the indwelling hose 2 to achieve positive pressure anti-backflow.

[0045] Pressing the pipe sealing clamp 21 can achieve sealing and clamping of the indwelling hose 2, thereby achieving the purpose of positive pressure sealing of the pipe.

[0046] In any of the above schemes, preferably, a needle holding handle 22 is integrally formed on one side of the needle structure 1; a first adjusting knob 23 is fixed on the top of the first screw sealing cap 4; and a second adjusting knob 25 is fixedly installed at the center of the outer end face of the limiting disc 24 at the outer end of the threaded column 19.

[0047] The needle structure 1 can be forced by pushing the needle holder 22, and the first adjusting knob 23 is arranged to adjust the first screw seal cap 4, and the second adjusting knob 25 is arranged to adjust the threaded column 19 to rotate and drive the moving piston 15 and the push plate 16 to move.

[0048] The thickness of the annular groove 18 matches the thickness of the rubber channel ring 14, the outer diameter of the push plate 16 is greater than the inner ring size of the rubber channel ring 14, when the threaded column 19 is screwed inward, the push plate 16 is driven to pass through the inner ring of the rubber channel ring 14 and block the two sides of the rubber channel ring 14 through the inner end surface of the moving piston 15 and the outer end surface of the push plate 16; when the push plate 16 moves inward, the inside of the needle structure 1 is under positive pressure, and the backflow blood is pushed out of the needle structure 1 to achieve positive pressure backflow prevention.

[0049] Specific working principle:

[0050] After the syringe or infusion tube is pulled out, the first anti-backflow pre-pressing unit can be used to achieve first-level automatic positive pressure to push the liquid in the needle structure 1 outwards, thereby achieving first-level positive pressure protection, wherein the main functions of the first anti-backflow pre-pressing unit are as follows: first, when normal infusion is performed, since there is a certain infusion pressure, when the infusion liquid flows into the first cavity 5, it will press the first pre-pressing plug 6 and the indwelling hose 2 on one side, on one hand, the liquid will flow into the patient's vein at a certain pressure, and on the other hand, the first pre-pressing plug 6 will be pressed to drive the light pressure spring 7 to be compressed and deformed and remain in a pressed state; second, the degree of rotation of the first screw seal cap 4 can be adjusted to increase the compression amplitude of the light pressure spring 7 in the pre-state; third, after the tube is pulled out, the reset spring of the light pressure spring 7 with increased compression degree drives the first pre-pressing plug 6 to move inward and block the outlet channel 11 of the outlet end of the connection elbow 8 of the infusion connection unit; fourth, the first pre-pressing plug 6 drives the indwelling hose 2 to be positively pressurized and sealed at the same time of the inward movement of the first pre-pressing plug 6, and the infusion connection unit is sealed by using a matched sealing cap.

[0051] In addition, to further ensure the safety of the sealing tube, the second anti-backflow spinning unit can be operated to achieve secondary positive pressure micro-push on the needle structure 1 part. Specifically, during operation, the threaded column 19 can be slightly screwed to push the moving piston 15 and the push plate 16 inward, and finally drive the push plate 16 to pass through the inner ring of the flexible rubber passage ring 14. Since the rubber passage ring 14 is flexible, it will be temporarily expanded after being pushed, so that the push plate 16 passes through the deformed rubber passage ring 14. Then, the rubber passage ring 14 is blocked on both sides by the inner end surface of the moving piston 15 and the outer end surface of the push plate 16 on both sides of the annular groove 18. Since the push plate 16 is pushed inward, a certain positive pressure is formed inside the needle structure 1 part, achieving the purpose of secondary positive pressure sealing tube.

[0052] Finally, according to the need for artificial operation of the third sealing tube anti-backflow unit, the indwelling tube 2 is pushed to achieve three-stage positive pressure, and the pressing clamping sealing tube clamp 21 is used to block and clamp the indwelling tube 2, thereby achieving the purpose of positive pressure sealing tube. After pushing the liquid, a drop of liquid bead will be formed at the end of the needle structure 1 due to the action of the liquid surface tension, finally achieving high-efficiency prevention of blood backflow into the device, improving the anti-backflow effect, and effectively realizing multi-stage positive pressure sealing tube.

[0053] The anti-needle-sticking positive pressure type venous indwelling needle assembly adopts a positive pressure anti-backflow mode to effectively prevent blood backflow into the needle structure 1 and the indwelling tube 2 after the infusion tube is pulled out, effectively reducing the problem of thrombus formation caused by blood backflow, and is safer and more reliable in use. The anti-needle-sticking positive pressure type venous indwelling needle assembly in the present application relies on the cooperation of the first anti-backflow pre-pressing unit, the second anti-backflow spinning unit, and the third sealing tube anti-backflow unit to achieve three-stage positive pressure sealing tube to prevent blood backflow into the needle structure 1. The three-stage positive pressure structure better ensures the anti-backflow effect. When the infusion tube or syringe is pulled out, three times of positive pressure can be generated according to the operation, effectively pushing the liquid in the indwelling tube 2 and the needle structure 1 forward, preventing blood backflow into the indwelling needle assembly, and avoiding the formation of thrombus. The special anti-backflow performance design can prevent blood backflow, effectively reduce catheter blockage, and no need to repeatedly use heparin sealing tube due to backflow during needle retention, which can effectively reduce the nursing workload.

[0054] The above embodiments are only used to illustrate the technical solutions of the present application, but not limit the present application; although the present application is described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions recorded in the above embodiments can be modified, or some or all of the technical features can be replaced equivalently; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the description of the present application; any alternative improvement or change made by those skilled in the art to the embodiments of the present application falls within the protection scope of the present application.

[0055] The parts not described in detail in the present application are well-known to those skilled in the art.

Claims

1. A needle-puncture-proof positive pressure intravenous indwelling needle assembly, comprising a needle tip structure, wherein an indwelling tubing is connected to one side of the needle tip structure, characterized in that: The inlet end of the indwelling tubing is connected to a first anti-backflow pre-compression unit. One side of the first anti-backflow pre-compression unit is connected to an infusion connection unit. The infusion connection unit is connected to the infusion tubing of an external infusion set and delivers the medication through the indwelling tubing into the human vein. A second anti-backflow compressive unit is installed at the rear end of the needle structure. A third sealing anti-backflow unit is installed on the indwelling tubing. The first anti-backflow pre-compression unit, the second anti-backflow compressive unit, and the third sealing anti-backflow unit work together to achieve three-level positive pressure sealing and prevent blood from flowing back into the needle structure. The first anti-backflow pre-compression unit includes a first positive pressure tube integrally connected to the inlet end of the indwelling hose, a first screw-on sealing cap screwed onto the outer threaded section of the outer side wall of the first positive pressure tube, a first pre-compression plug installed in the sealing plug of the first cavity of the first positive pressure tube, and a light pressure spring fixedly installed on the top of the first pre-compression plug, with the top of the light pressure spring fixed on the first screw-on sealing cap. The bottom of the first pre-compression plug is a downward-convex spherical curved surface; The second anti-backflow spinning unit includes a second positive pressure tube integrally fixed to the rear end of the needle structure and communicating with its interior. A rubber channel ring is fixedly installed in the second cavity of the second positive pressure tube. A movable piston is movably and sealed in the second cavity at the outer end of the rubber channel ring. A push plate is fixedly installed in the inner end of the movable piston. An annular groove is provided on the outer side of the connecting shaft between the push plate and the inner end face of the movable piston. A threaded column is installed at the outer end of the movable piston. The outer end of the threaded column is screwed outward through the central threaded hole of the second sealing plug and extends to the outside of the second positive pressure tube. The outer side wall of the second sealing plug is screwed into the inner side wall of the second cavity of the second positive pressure tube through a threaded seal. The third sealing tube anti-backflow unit is a sealing tube clamp that is snapped onto the indwelling tubing; During normal intravenous infusion, when the infusion fluid flows into the first chamber, it will apply pressure to the first pre-compression plug and the indwelling tubing side, so that the fluid flows into the patient's vein. At the same time, the first pre-compression plug is compressed and deformed by the pressure, and remains under pressure. Adjust the tightness of the first screw-on sealing cap and increase the compression amplitude of the pre-set light pressure spring; After the tube is removed, the first pre-compression plug moves inward by the restoring force of the light pressure spring and blocks the outlet end channel of the connecting bend of the infusion connection unit. The first pre-pressure plug moves inward, causing it to apply positive pressure to the indwelling tubing and simultaneously block the inlet.

2. The anti-needle-puncture positive pressure intravenous indwelling needle assembly according to claim 1, characterized in that: The infusion connection unit includes a connecting bend integrally formed on the lower side of the first positive pressure tube. An infusion connection tube is fixed at the top of the connecting bend. An external threaded connection port is provided at the inlet end of the infusion connection tube. The external threaded connection port is used to connect with an external infusion tube. The outlet end channel of the connecting bend is connected to the first cavity below the first pre-pressure plug.

3. The anti-needle-puncture positive pressure intravenous indwelling needle assembly according to claim 2, characterized in that: After the external threaded connection is separated from the external infusion tube, a sealing cap is installed for sealing and protection. After the external threaded connection is separated from the external infusion tube, the first pre-compression plug seals the outlet end channel of the connecting bend under the elastic force of the light compression spring.

4. The anti-needle-puncture positive pressure intravenous indwelling needle assembly according to claim 3, characterized in that: Closing the sealing clamp creates positive pressure at the outlet end of the indwelling hose to prevent backflow.

5. The anti-needle-puncture positive pressure intravenous indwelling needle assembly according to claim 4, characterized in that: A needle-holding handle is integrally formed on one side of the needle structure; a first adjustment knob is fixed on the top of the first screw-on sealing cap; and a second adjustment knob is fixedly installed at the center of the outer end face of the limiting plate at the outer end of the threaded column.

6. The anti-needle-puncture positive pressure intravenous indwelling needle assembly according to claim 5, characterized in that: The thickness of the annular groove matches the thickness of the rubber channel ring. The outer diameter of the push plate is larger than the inner ring size of the rubber channel ring. When the threaded post is screwed inward, the push plate is driven to passively pass through the inner ring of the rubber channel ring and the inner end face of the moving piston on both sides of the annular groove and the outer end face of the push plate seal both sides of the rubber channel ring. When the push plate moves inward, the needle structure is subjected to positive pressure and the backflowing blood is pushed out of the needle structure to achieve positive pressure and prevent backflow.

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