Venous indwelling needle assembly with soft needle core

Abstract

The utility model relates to the technical field of venous indwelling needles, and discloses a venous indwelling needle assembly with a soft needle core, which comprises a positive pressure connector, a connector is fixedly connected to one side wall of the positive pressure connector, and an infusion extension tube is fixedly connected to the bottom end of the positive pressure connector. The closed tube can ensure that the soft needle core body is in a sterile state when being pulled out and inserted in, a medical worker communicates the infusion extension tube with the sleeve, puncture liquid medicine or blood is prevented from flowing into the closed tube, the puncture hard needle core is pulled out and discarded after blood return is found, and the liquid medicine in the infusion extension tube enters the blood through the sleeve. When the venous indwelling needle is used, the soft needle core body can be used for blocking and filling the cannula, blood is prevented from flowing back into the indwelling needle during the indwelling period of the venous indwelling needle, thrombus is prevented, and the cannula can be prevented from being blocked due to the fact that the cannula is pressed and collapsed during the indwelling period.

Description

Technical Field

[0001] The utility model relates to the technical field of venous indwelling needles, in particular to a venous indwelling needle assembly with a soft needle core. Background Art

[0002] A venous indwelling needle assembly with a soft needle core is a medical device used for intravenous infusion therapy in hospitals and clinics. The design of this indwelling needle aims to reduce the pain during blood vessel puncture and provide a safer, more comfortable and convenient infusion method.

[0003] In the "Closed Venous Indwelling Needle" disclosed in the patent application No. 201020606362.2, the problem that the existing indwelling needle has a relatively large local skin pressure, is prone to cause pressure sores on the skin of the contact part, and increases the new pain of patients is solved. However, there are still some problems with this indwelling needle. In practice, the existing venous indwelling needle is composed of a hard pillow core in the center for puncture and an outer soft sleeve. After puncture, the hard pillow core is removed and discarded, and the outer soft sleeve is left in the blood vessel. After intravenous infusion, a catheter flush device (commonly known as "sealing solution") is used to seal the tube, and the liquid medicine in the intravenous indwelling needle infusion extension tube and the needle tube is injected into the blood vessel, and the intravenous indwelling needle infusion extension tube is clamped. In theory, after sealing the tube, due to the closed catheter, blood no longer enters the sleeve. However, in clinical applications, due to reasons such as patient limb movement and blocked venous blood return, the local blood pressure increases, and blood still flows back into the sleeve of the indwelling needle, and even into the needle hub and the infusion extension tube. Clinically, this phenomenon is called "blood reflux". The refluxed blood is prone to coagulation and form thrombus due to the slow or even stopped blood flow speed. The formation of thrombus may lead to three consequences: one is that the cannula needle is blocked, and this indwelling needle cannot be used anymore and needs to be removed and re-punctured and indwelled, which increases the workload of medical staff, the economic burden and pain of patients, and multiple punctures of blood vessels increase blood vessel damage and reduce the blood vessel repair time, which is not conducive to the progress of long-term intravenous treatment; the second is that the thrombus detaches and enters the blood vessel with the liquid, causing the risk of embolism, which may lead to adverse consequences such as cerebral infarction, pulmonary embolism, lower extremity deep vein thrombosis, phlebitis, etc.; the third is that medical staff find the formation of thrombus, draw out the thrombus, and then continue to use this cannula needle. This operation does not conform to the nursing standard, and it is easy to destroy the aseptic environment inside the cannula needle during the operation, and it is easy for germs in the environment to enter the venous indwelling needle, causing phlebitis and even other blood infections. Content of the Utility Model

[0004] Aiming at the deficiencies of the prior art, the utility model provides a venous indwelling needle assembly with a soft needle core, which solves the problems that multiple punctures of blood vessels increase blood vessel damage, reduce the blood vessel repair time, are not conducive to the progress of long-term intravenous treatment, and the thrombus detaches and enters the blood vessel with the liquid, causing the risk of embolism, which may lead to adverse consequences such as cerebral infarction, pulmonary embolism, lower extremity deep vein thrombosis, phlebitis, etc.

[0005] To achieve the above object, the utility model is realized by the following technical solutions: A venous indwelling needle assembly with a soft needle core, including a positive pressure connector, one side wall of the positive pressure connector is fixedly connected with a connecting head, the bottom end of the positive pressure connector is fixedly connected with an infusion extension tube, the bottom of the infusion extension tube is provided with a needle holder, the bottom end of the needle holder is fixedly connected with an adjustment cylinder, one side of the adjustment cylinder is fixedly connected with a connector one, the other side of the adjustment cylinder is fixedly connected with a connector two, and a soft needle core mechanism is arranged on one side of the connector two. The soft needle core mechanism includes a handle, a isolation plug, a soft needle core body and a closing tube. One side of the connector two is threadedly connected with the closing tube, the soft needle core body is inserted into the interior of the closing tube, one end of the soft needle core body is fixedly connected with a handle, and the bottom end of the adjustment cylinder is fixedly connected with a connecting tube;

[0006] A regulating mechanism is arranged at the bottom of the needle holder. The regulating mechanism includes a regulating handle, an extension rod, a sealing gasket, a piston and a through groove. Two through grooves are formed in the middle of the piston, and one side of the inner wall of the adjustment cylinder is fixedly connected with a sealing gasket.

[0007] Preferably, the connector one is threadedly connected with one end of the infusion extension tube, a clip is sleeved on the middle part of the infusion extension tube, and the size of the isolation plug matches the size of the closing tube.

[0008] Preferably, a needle holding handle is fixedly connected to the top end of the needle holder, and the inner wall of the positive pressure connector is provided with threads.

[0009] Preferably, the bottom end of the connecting tube is fixedly connected with a needle, a sleeve is sleeved outside the needle, and the top end of the sleeve is snap-connected to the bottom end of the connecting tube.

[0010] Preferably, an isolation plug is sleeved outside the handle.

[0011] Preferably, the piston is rotatably connected to the inner wall of the adjustment cylinder.

[0012] Preferably, one end of the piston is fixedly connected with an extension rod, and one end of the extension rod is fixedly connected with a regulating handle.

[0013] Preferably, one end of the extension rod is rotatably connected to the inner side of the sealing gasket. Beneficial effects

[0014] The utility model provides a venous indwelling needle assembly with a soft needle core. Compared with the prior art, the following beneficial effects are achieved:

[0015] In the present utility model, through the provided indwelling needle assembly, during puncture, the soft needle core body is inside the closed tube. The closed tube expands, and the closed tube can ensure that the soft needle core body is in a sterile state both when being pulled out and inserted. Medical staff connect the infusion extension tube to the cannula, preventing puncture liquid medicine or blood from flowing into the closed tube. After seeing blood return, the puncture hard needle core is pulled out and discarded. The liquid medicine in the infusion extension tube enters the blood through the cannula. The soft needle core body can be used to block and fill the cannula, preventing blood from flowing back into the indwelling needle during the indwelling period of the venous indwelling needle, thereby preventing thrombus formation, and also preventing the cannula from being compressed and collapsed to form a blocked tube during the indwelling period.

[0016] 2. In the present utility model, through the provided adjustment mechanism, after the infusion is completed, the nurse uses a catheter flush syringe to inject the residual liquid medicine in the device into the blood vessel. Operate the adjustment knob to drive the piston to rotate and close connector one, connecting the soft needle core body to the cannula. Operate the handle to push the soft needle core into the cannula. The closed tube contracts or folds. When infusing again, after the nurse connects the infusion set, operate the outer handle of the soft needle core seat to withdraw the soft needle core from the cannula and retreat it to the outer closed tube of the soft needle core device. The closed tube expands. Operate the adjustment knob to drive the piston to rotate and close soft connector two, connecting the infusion extension tube to the cannula. The liquid medicine in the infusion extension tube enters the blood through the cannula. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 FIG. is a three-dimensional structural schematic diagram of a venous indwelling needle assembly with a soft needle core proposed by the present utility model;

[0018] Figure 2 is a proposed by the present utility model a venous indwelling needle assembly with a soft needle core Figure 1 enlarged view at A in;

[0019] Figure 3 FIG. is a structural schematic diagram of the needle seat part of a venous indwelling needle assembly with a soft needle core proposed by the present utility model;

[0020] Figure 4 FIG. is a structural cross-sectional view of the needle seat part of a venous indwelling needle assembly with a soft needle core proposed by the present utility model.

[0021] LEGEND DESCRIPTION:

[0022] 1. Positive pressure connector; 2. Adjustment mechanism; 201. Adjustment cylinder; 202. Adjustment knob; 203. Extension rod; 204. Sealing gasket; 205. Piston; 206. Through groove; 3. Connector; 4. Clip; 5. Infusion extension tube; 6. Needle seat; 7. Soft needle core mechanism; 701. Connector one; 702. Connector two; 703. Handle; 704. Isolation plug; 705. Soft needle core body; 706. Closed tube; 707. Connecting tube; 8. Needle holding handle; 9. Cannula; 10. Needle tip. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts shall fall within the protection scope of the present utility model.

[0024] Please refer to Figure 1 - Figure 4 , the present utility model provides two technical solutions, specifically including the following embodiments: Embodiment 1

[0025] A venous indwelling needle assembly with a soft needle core includes a positive pressure connector 1. One side wall of the positive pressure connector 1 is fixedly connected to a connecting head 3. The bottom end of the positive pressure connector 1 is fixedly connected to an infusion extension tube 5. The bottom of the infusion extension tube 5 is provided with a needle seat 6. The bottom end of the needle seat 6 is fixedly connected to an adjustment cylinder 201. One side of the adjustment cylinder 201 is fixedly connected to a connector 701, and the other side of the adjustment cylinder 201 is fixedly connected to a connector 702. A soft needle core mechanism 7 is provided on one side of the connector 702. The soft needle core mechanism 7 includes a handle 703, a septum 704, a soft needle core body 705, and a sealing tube 706. A sealing tube 706 is threadedly connected to one side of the connector 702. The soft needle core body 705 is inserted into the sealing tube 706. One end of the soft needle core body 705 is fixedly connected to a handle 703. The bottom end of the adjustment cylinder 201 is fixedly connected to a connecting tube 707. The connector 701 is threadedly connected to one end of the infusion extension tube 5. A clip 4 is sleeved on the middle part of the infusion extension tube 5. The size of the septum 704 matches the size of the sealing tube 706. The top end of the needle seat 6 is fixedly connected to a needle holder 8. The inner wall of the positive pressure connector 1 is provided with threads. The bottom end of the connecting tube 707 is fixedly connected to a needle 10. A sleeve 9 is sleeved outside the needle 10. The top end of the sleeve 9 is snap-connected to the bottom end of the connecting tube 707. A septum 704 is sleeved outside the handle 703. The septum 704 and the sealing tube 706 can isolate the soft needle core body 705 from the external environment, ensuring that the soft needle core body 705 is in a sterile state both when being pulled out and inserted.

[0026] During operation, when puncturing, the soft needle core body 705 is inside the closed tube 706. The closed tube 706 expands. The closed tube 706 can ensure that the soft needle core body 705 is in a sterile state both when being pulled out and inserted. Medical staff connect the infusion extension tube 5 to the cannula 9 to prevent puncture liquid medicine or blood from flowing into the closed tube 706. After seeing blood return, the puncturing hard needle core is pulled out and discarded. The liquid medicine in the infusion extension tube 5 enters the blood through the cannula 9. The soft needle core body 705 can be used to block and fill the cannula 9 to avoid blood reflux into the indwelling needle during the indwelling period of the venous indwelling needle, thereby preventing thrombus formation, and can also prevent the cannula 9 from being compressed and collapsed during indwelling to form a blocked tube. Embodiment 2

[0027] On the basis of Embodiment 1, an adjusting mechanism 2 is provided at the bottom of the needle hub 6. The adjusting mechanism 2 includes an adjusting knob 202, an extension rod 203, a sealing gasket 204, a piston 205 and a through groove 206. Two through grooves 206 are formed in the middle of the piston 205. One side of the inner wall of the adjusting cylinder 201 is fixedly connected with a sealing gasket 204. The sealing gasket 204 can avoid the sealing performance at the connection between the adjusting cylinder 201 and the piston 205. The piston 205 is rotatably connected to the inner wall of the adjusting cylinder 201. One end of the piston 205 is fixedly connected with an extension rod 203. One end of the extension rod 203 is fixedly connected with an adjusting knob 202. One end of the extension rod 203 is rotatably connected to the inner side of the sealing gasket 204.

[0028] After the infusion is completed, the nurse uses a catheter flush device to inject the residual liquid medicine in the device into the blood vessel. Operate the adjusting knob 202 to drive the piston 205 to rotate to close the connector 701, connect the soft needle core body 705 to the cannula 9. Operate the handle 703 to push the soft needle core into the cannula 9. The closed tube 706 shrinks or folds. When infusing again, after the nurse connects the infusion set, operate the handle 703 outside the soft needle core needle hub 6 to withdraw the soft needle core from the cannula 9 and retreat it to the outer closed tube 706 of the soft needle core device. The closed tube 706 expands. Operate the adjusting knob 202 to drive the piston 205 to rotate to close the soft connector 702, connect the infusion extension tube 5 to the cannula 9. The liquid medicine in the infusion extension tube 5 enters the blood through the cannula 9, thereby preventing germs from entering the needle hub 6 and causing phlebitis or even other blood infections.

[0029] The above are only the preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the application shall be included in the protection scope of the present application.

Claims

1. A venous indwelling needle assembly with a soft needle core, comprising a positive pressure connector (1), characterized in that: One side wall of the positive pressure connector (1) is fixedly connected with a connector (3). The bottom end of the positive pressure connector (1) is fixedly connected with an infusion extension tube (5). The bottom of the infusion extension tube (5) is provided with a needle seat (6). The bottom end of the needle seat (6) is fixedly connected with an adjustment cylinder (201). One side of the adjustment cylinder (201) is fixedly connected with a connector one (701). The other side of the adjustment cylinder (201) is fixedly connected with a connector two (702). One side of the connector two (702) is provided with a soft needle core mechanism (7). The soft needle core mechanism (7) includes a handle (703), a septum (704), a soft needle core body (705) and a closed tube (706). One side of the connector two (702) is threadedly connected with a closed tube (706). The soft needle core body (705) is inserted into the interior of the closed tube (706). One end of the soft needle core body (705) is fixedly connected with a handle (703). The bottom end of the adjustment cylinder (201) is fixedly connected with a connecting tube (707). The bottom of the needle seat (6) is provided with an adjustment mechanism (2). The adjustment mechanism (2) includes an adjustment knob (202), an extension rod (203), a gasket (204), a piston (205) and a through groove (206). Two through grooves (206) are formed in the middle of the piston (205). One side of the inner wall of the adjustment cylinder (201) is fixedly connected with a gasket (204).

2. The venous indwelling needle assembly with a soft needle core according to claim 1, characterized in that: The connector one (701) is threadedly connected with one end of the infusion extension tube (5). A clip (4) is sleeved on the middle of the infusion extension tube (5). The size of the septum (704) matches the size of the closed tube (706).

3. A venous indwelling needle assembly with a soft needle core according to claim 1, characterized in that: The top end of the needle seat (6) is fixedly connected with a needle holding handle (8). The inner wall of the positive pressure connector (1) is provided with threads.

4. The venous indwelling needle assembly with a soft needle core according to claim 1, characterized in that: The bottom end of the connecting tube (707) is fixedly connected with a needle (10). A sleeve (9) is sleeved on the outside of the needle (10). The top end of the sleeve (9) is snap-connected to the bottom end of the connecting tube (707).

5. The venous indwelling needle assembly with a soft needle core according to claim 1, characterized in that: The outside of the handle (703) is sleeved with a septum (704).

6. The venous indwelling needle assembly with a soft needle core according to claim 1, wherein: The piston (205) is rotatably connected to the inner wall of the adjustment cylinder (201).

7. A venous indwelling needle assembly with a soft needle core according to claim 1, characterized in that: One end of the piston (205) is fixedly connected with an extension rod (203). One end of the extension rod (203) is fixedly connected with an adjustment knob (202).

8. The indwelling venous catheter assembly with a soft needle core according to claim 1, characterized in that: One end of the extension rod (203) is rotatably connected to the inside of the gasket (204).

Images