Venous indwelling needle capable of preventing transfusion backflow
By designing a driven part in the intravenous indwelling needle, including a fixing ring, a concave elastic membrane, a rubber ring and a barrier, the problems of infusion counterflow and blood reflux are solved, and the stable delivery and filling of the medicine liquid are achieved.
Patent Information
- Application Number
- CN202420911809.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-29
- Publication Date
- 2025-03-04
- Estimated Expiration
- 2034-04-29
AI Technical Summary
Existing intravenous indwelling needles are prone to infusion counterflow during use, resulting in blood reflux and cannot be effectively avoided.
A venous indwelling needle is designed, including an indwelling cannula, a puncture guide needle core, an extension tube connecting base and a driven part for anti-countercurrent. The driven part includes a fixing ring, a concave elastic film, a rubber ring and a barrier. The concave elastic film is opened by the pressure of the medicine fluid, which drives the rubber ring to deform, and the barrier blade snaps into the through hole to prevent countercurrent.
It effectively avoids the counterflow of infusion, prevents blood reflux, ensures that the liquid is full and is delivered stably, and improves the effectiveness of the intravenous indwelling needle.
Smart Images
Figure CN222549852U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of medical devices, in particular to a venous indwelling needle for preventing reverse flow of infusion. Background Art
[0002] The use of intravenous catheters can reduce the pain caused by repeated intravenous punctures and the fear of injections, reduce anxiety, facilitate clinical medication, emergency medication for critically ill patients, reduce the workload of nurses, and reduce patient pain. Therefore, intravenous catheters are widely used in clinical practice. The length and comfort of intravenous catheter retention have become the most concerned issues for nurses and patients, and are also the signs of successful use and the premise of promotion of intravenous catheters. The intravenous catheter is composed of a stainless steel core, a soft outer sleeve and a plastic needle seat. During puncture, the outer sleeve and the needle core are inserted into the blood vessel together. After the sleeve is sent into the blood vessel, the needle core is withdrawn, and only the soft outer sleeve is left in the blood vessel for infusion.
[0003] Indwelling needles are prone to blood backflow when in use, and medical staff need to deal with them in time. At present, in order to avoid the phenomenon of reflux, a one-way valve is usually set in the indwelling cannula for one-way infusion, so that blood cannot enter the infusion tube. However, this operation will still cause blood to flow back into the indwelling cannula until the indwelling cannula is filled and will not continue to flow back. It is impossible to avoid the phenomenon of blood backflow. For this reason, we propose an intravenous indwelling needle that prevents infusion backflow. Utility Model Content
[0004] The utility model aims to provide a venous indwelling needle for preventing reverse flow of infusion, so as to solve the problems raised in the above-mentioned background technology.
[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a venous indwelling needle for preventing reverse flow of infusion, comprising an indwelling cannula;
[0006] A puncture guide needle core inserted into the interior of the indwelling cannula;
[0007] An extension tube connection seat fixed on the surface of the indwelling sleeve and connected to the indwelling sleeve;
[0008] A driven part for preventing backflow is arranged inside the indwelling sleeve.
[0009] Preferably, the driven part includes a fixing ring, which is fixed on the inner wall of the indwelling sleeve, a concave elastic membrane is fixed on the right side of the fixing ring, a clamping groove is provided on the surface of the concave elastic membrane, a rubber ring is clamped on the inner side of the clamping groove, a clamping ring is fixed on the right side of the fixing ring, a through hole is provided on the inner side of the clamping ring, and a blocking sheet is fixed on the inner side of the through hole. During infusion, the drug liquid enters the indwelling sleeve through the extension tube connecting seat. As the drug liquid continues to accumulate, the concave elastic membrane is opened under the pressure of the drug liquid, so that infusion can be performed through the indwelling sleeve. At this time, the concave elastic membrane drives the rubber ring to deform, and a part of the rubber ring abuts against the blocking sheet and is clamped in the through hole. The blocking sheet abuts against the surface of the rubber ring. When no infusion is performed, the concave elastic membrane is in a closed state under the action of the rubber ring, the concave elastic membrane and the drug liquid in the indwelling sleeve and on the right side of the fixing ring, thereby avoiding the reverse flow of infusion and the phenomenon of blood reflux.
[0010] Preferably, the interior of the indwelling sleeve is conical on the left side of the fixing ring, ensuring that the drug solution entering the indwelling sleeve can pass through the fixing ring and the concave elastic membrane along the conical surface of the inner wall of the indwelling sleeve and enter the indwelling sleeve on the right side of the fixing ring.
[0011] Preferably, six groups of through holes and blocking sheets are provided, and the six groups of through holes and blocking sheets are arranged in a circular array with the center point of the locking ring as the center, so as to stably lock the rubber ring.
[0012] Preferably, the surface of the rubber ring is provided with rubber protrusions. When the rubber ring abuts against the blocking sheet and a part of it is stuck in the through hole, the blocking sheet can abut against the rubber protrusions on the surface of the rubber ring to increase the resistance between the blocking sheet and the rubber ring. When no infusion is performed, the concave elastic membrane is no longer subjected to the pressure of the drug solution, and can be reset under the action of the rubber ring and its own elasticity. At this time, the blocking sheet abuts against the rubber ring and the rubber protrusions to slow down the reset speed of the concave elastic membrane, ensuring that the drug flow on the left side of the fixing ring in the indwelling sleeve can flow to the right side of the concave elastic membrane through the concave elastic membrane, ensuring that the drug solution on the right side of the concave elastic membrane in the indwelling sleeve is in a filled state, thereby effectively avoiding the phenomenon of blood reflux.
[0013] Preferably, the fixing ring is hollow, allowing the puncture guide needle to pass through and allowing the drug solution to flow.
[0014] Compared with the prior art, the utility model provides a venous indwelling needle for preventing infusion backflow, which has the following beneficial effects:
[0015] The intravenous indwelling needle for preventing reverse flow of infusion has a follower part arranged so that after the infusion is stopped, the medicine liquid on the left side of the fixing ring in the indwelling sleeve passes through the tapered surface of the inner wall of the indwelling sleeve, the fixing ring and the concave elastic membrane, and enters the right side of the fixing ring in the indwelling sleeve. The medicine liquid is gradually reset under the elastic action of the rubber ring and the concave elastic membrane, ensuring that the medicine liquid on the right side of the concave elastic membrane in the indwelling sleeve is in a filled state. Under the action of the rubber ring, the concave elastic membrane and the medicine liquid on the right side of the fixing ring in the indwelling sleeve, the concave elastic membrane is in a closed state, thereby preventing reverse flow of infusion and causing blood reflux. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 This is a schematic diagram of the front view structure of the utility model;
[0017] Figure 2 This is a schematic diagram of the cross-sectional structure of the utility model;
[0018] Figure 3 This is a schematic diagram of the structure of the driven part of the utility model;
[0019] Figure 4 This is a schematic diagram of the structure of the clamping ring and the blocking piece of the utility model;
[0020] Figure 5 This is a schematic diagram of the concave elastic membrane structure of the utility model;
[0021] Figure 6 The utility model is a schematic diagram of the connection structure of the concave elastic membrane, the rubber ring and the rubber protrusion.
[0022] In the figure: 1. Indwelling sleeve; 2. Driven part; 21. Fixing ring; 22. Concave elastic membrane; 23. Snap-in groove; 24. Rubber ring; 25. Positioning ring; 26. Through hole; 27. Blocking sheet; 3. Puncture guide needle core; 4. Extension tube connecting seat; 5. Rubber bump. DETAILED DESCRIPTION
[0023] like Figure 1-Figure 6 As shown, the utility model provides a technical solution: an intravenous indwelling needle for preventing backflow of infusion, comprising an indwelling sleeve 1, a puncture guide needle core 3 is inserted into the interior of the indwelling sleeve 1, an extension tube connecting seat 4 is fixed to the surface of the indwelling sleeve 1 and the indwelling sleeve 1 is connected to the extension tube connecting seat 4, and a driven part 2 for preventing backflow is arranged inside the indwelling sleeve 1.
[0024] The driven part 2 includes a fixing ring 21, which is fixed on the inner wall of the indwelling sleeve 1. A concave elastic membrane 22 is fixed on the right side of the fixing ring 21. A clamping groove 23 is provided on the surface of the concave elastic membrane 22. A rubber ring 24 is clamped on the inner side of the clamping groove 23. A clamping ring 25 is fixed on the right side of the fixing ring 21. A through hole 26 is provided on the inner side of the clamping ring 25. A blocking sheet 27 is fixed on the inner side of the through hole 26. During infusion, the drug solution enters the indwelling sleeve 1 through the extension tube connector 4. As the drug solution accumulates continuously, it is subjected to the drug solution pressure, so that The concave elastic membrane 22 is in an open state, so that infusion can be performed through the indwelling sleeve 1. At this time, the concave elastic membrane 22 drives the rubber ring 24 to deform, and a portion of the rubber ring 24 abuts against the blocking piece 27 and is inserted into the through hole 26. The blocking piece 27 abuts against the surface of the rubber ring 24. When no infusion is performed, the concave elastic membrane 22 is in a closed state due to the action of the rubber ring 24, the concave elastic membrane 22, and the liquid medicine on the right side of the fixing ring 21 in the indwelling sleeve 1, thereby avoiding the reverse flow of infusion and the phenomenon of blood reflux.
[0025] The interior of the indwelling sleeve 1 is tapered on the left side of the fixing ring 21 to ensure that the liquid medicine entering the indwelling sleeve 1 can enter the indwelling sleeve 1 on the right side of the fixing ring 21 along the tapered surface of the inner wall of the indwelling sleeve 1 through the fixing ring 21 and the concave elastic membrane 22.
[0026] There are six groups of through holes 26 and blocking sheets 27, and the six groups of through holes 26 and blocking sheets 27 are arranged in a circular array with the center point of the retaining ring 25 as the center, which can stably retain the rubber ring 24. The fixing ring 21 is hollow, allowing the puncture guide needle core 3 to pass through and the drug solution to flow.
[0027] The surface of the rubber ring 24 is provided with rubber protrusions 5. When the rubber ring 24 abuts against the blocking sheet 27 and a part of it is stuck in the through hole 26, the blocking sheet 27 can abut against the rubber protrusions 5 on the surface of the rubber ring 24, thereby increasing the resistance between the rubber ring 24 and the rubber ring 24. When no infusion is performed, the concave elastic membrane 22 is no longer subjected to the pressure of the drug solution, thereby being reset under the action of the rubber ring 24 and its own elasticity. At this time, the blocking sheet 27 abuts against the rubber ring 24 and the rubber protrusions 5, thereby slowing down the reset speed of the concave elastic membrane 22, thereby ensuring that the drug flow on the left side of the fixing ring 21 in the indwelling sleeve 1 can flow to the right side of the concave elastic membrane 22 through the concave elastic membrane 22, thereby ensuring that the drug solution on the right side of the concave elastic membrane 22 in the indwelling sleeve 1 is in a full state, thereby effectively avoiding the phenomenon of blood reflux.
[0028] Based on the above embodiment, the puncture guide needle core 3 is used to perform the puncture operation. After the puncture is completed, the puncture guide needle core 3 is taken out and the infusion operation is performed.
[0029] During infusion, the liquid medicine enters the indwelling cannula 1 through the extension tube connector 4. As the liquid medicine accumulates, the pressure of the liquid medicine causes the concave elastic membrane 22 to be opened, so that infusion can be performed through the indwelling cannula 1. At this time, the concave elastic membrane 22 causes the rubber ring 24 to deform, and a portion of the rubber ring 24 abuts against the blocking sheet 27 and is inserted into the through hole 26. The blocking sheet 27 can abut against the rubber protrusion 5 on the surface of the rubber ring 24.
[0030] After the infusion is stopped, the liquid medicine on the left side of the fixing ring 21 in the indwelling sleeve 1 passes through the tapered surface of the inner wall of the indwelling sleeve 1, through the fixing ring 21 and the concave elastic membrane 22, and enters the indwelling sleeve 1 on the right side of the fixing ring 21, and gradually returns to its original position under the elastic action of the rubber ring 24 and the concave elastic membrane 22, ensuring that the liquid medicine on the right side of the concave elastic membrane 22 in the indwelling sleeve 1 is in a filled state. Under the action of the rubber ring 24, the concave elastic membrane 22 and the liquid medicine on the right side of the fixing ring 21 in the indwelling sleeve 1, the concave elastic membrane 22 is in a closed state, thereby avoiding the reverse flow of the infusion and the phenomenon of blood reflux.
[0031] The above generally describes the present invention in detail, but it is obvious to a person skilled in the art that some modifications or improvements can be made to the present invention. Therefore, modifications or improvements that do not deviate from the spirit of the present invention are within the scope of protection of the present invention.
Claims
1. A venous indwelling needle for preventing reverse flow of infusion, comprising an indwelling cannula (1); A puncture guide needle core (3) inserted into the interior of the indwelling sleeve (1); an extension tube connection seat (4) fixed on the surface of the indwelling sleeve (1) and connected to the indwelling sleeve (1); Features: A driven part (2) for preventing backflow is arranged inside the indwelling sleeve (1).
2. A venous indwelling needle for preventing reverse flow of infusion according to claim 1, characterized in that: The driven part (2) comprises a fixing ring (21), the fixing ring (21) being fixed on the inner wall of the indwelling sleeve (1), a concave elastic membrane (22) being fixed on the right side of the fixing ring (21), a clamping groove (23) being provided on the surface of the concave elastic membrane (22), a rubber ring (24) being clamped on the inner side of the clamping groove (23), a retaining ring (25) being fixed on the right side of the fixing ring (21), a through hole (26) being provided on the inner side of the retaining ring (25), and a blocking sheet (27) being fixed on the inner side of the through hole (26).
3. A venous indwelling needle for preventing reverse flow of infusion according to claim 2, characterized in that: The interior of the indwelling sleeve (1) is located on the left side of the fixing ring (21) and is tapered.
4. The intravenous indwelling needle for preventing reverse flow of infusion according to claim 2, characterized in that: The through holes (26) and the blocking sheets (27) are each provided in six groups, and the six groups of through holes (26) and the blocking sheets (27) are each arranged in a circular array with the center point of the locking ring (25) as the center.
5. The intravenous indwelling needle for preventing reverse flow of infusion according to claim 2, characterized in that: The surface of the rubber ring (24) is provided with rubber protrusions (5).
6. The intravenous indwelling needle for preventing reverse flow of infusion according to claim 2, characterized in that: The fixing ring (21) is hollow.