CN114748728A - Continuous positive pressure venous catheter - Google Patents

Abstract

The invention discloses a continuous positive pressure venous indwelling needle, comprising a catheter assembly and a needle tube assembly which are connected to each other. The catheter assembly includes a catheter seat and a catheter fixed at its distal end and used for infusion. The needle tube assembly at least includes a needle tube A seat and a needle tube, one side of the catheter seat communicates with the infusion connector through a positive pressure component, the positive pressure component is a deformed tube made of elastic medical material, and the two ends of the deformed tube are respectively fixed with a first A conduit and a second conduit, the first conduit is provided with a flow stop clip that is in flexible contact therewith, and the other end of the first conduit is fixed and communicated with the conduit seat, and the other end of the second conduit is fixed with the infusion connector and Connected. The present invention is provided with an expandable deformable tube to provide continuous positive pressure so that the liquid medicine inside the catheter can always maintain a flowing state, so as to avoid the formation of thrombus on the top or inside of the catheter.

Description

Continuous positive pressure venous catheter

technical field

The invention relates to the technical field of injection devices, in particular to a continuous positive pressure intravenous indwelling needle.

Background technique

The use of venous indwelling needles can reduce the pain and fear of injections caused by repeated venipuncture, reduce the anxiety of family members, facilitate clinical medication, rescue medication for emergency and critically ill patients, reduce the workload of nurses, and reduce patient pain. Therefore, intravenous indwelling needles are widely used in clinical practice.

Chinese patent CN202822325U discloses an intravenous indwelling needle, which includes a catheter assembly, a needle tube assembly and an infusion fluid connector assembly. The catheter assembly includes a three-way catheter seat and a catheter connected to the front end of the first opening of the three-way catheter seat. The needle tube assembly includes a needle seat sleeved outside the third opening of the three-way catheter seat and a needle tube connected to the needle seat. The needle tube is inserted into the catheter and the inside of the three-way catheter seat. The second opening of the three-way conduit seat is connected to the infusion fluid connector assembly, which includes a long conduit, a stop clip, an infusion joint, a heparin cap, an end cap, etc.; the second opening of the three-way conduit holder is connected to the long conduit , the long catheter is equipped with a stop clip, and the other end of the long catheter is connected to the infusion connector; one side of the infusion connector is provided with a heparin cap, and the other side is connected with an end cap; the infusion device can be inserted into the heparin cap Perform an infusion of normal saline. During the use of the intravenous indwelling needle, the stop clip needs to be opened, and the infusion is carried out through the infusion device with the heparin cap or end cap; when the infusion is completed, the end cap is used to seal one side of the infusion connector, while the other side The normal saline in the infusion device is pushed through the infusion device connected to the heparin cap to flush the lumen of the venous indwelling needle; when the flushing is completed, an external force is applied to close the flow stop clip. The boss clamps the long conduit and stops the flow of the long conduit.

The venous indwelling needle in the prior art will be pulled out after the infusion is completed. Since the human vein has a certain blood pressure, the catheter will be in a negative pressure state, and the blood will flow back to the catheter. Promote the formation of blood clots, or the blood clots may enter the patient with the drug solution during the next infusion, causing unnecessary medical accidents.

SUMMARY OF THE INVENTION

The purpose of the present invention is to overcome the shortcomings of the prior art and provide a continuous positive pressure venous indwelling needle.

The object of the present invention is achieved through the following technical solutions:

The continuous positive pressure venous indwelling needle comprises an interconnected catheter assembly and a needle tube assembly, the catheter assembly includes a catheter seat and a catheter fixed at its distal end for infusion, the needle tube assembly at least includes a needle tube seat and a needle tube, the The proximal end of the needle tube is inserted in the needle tube seat and fixed to each other, the distal end of the needle tube passes through the hollow interior of the catheter and protrudes, and one side of the catheter seat is connected to the infusion connector through the positive pressure component, so the The positive pressure component is a deformed tube made of elastic medical material, the two ends of the deformed tube are respectively fixed with a first conduit and a second conduit through a connecting sleeve, and the first conduit is provided with a stopper that is in flexible contact with it. The other end of the flow clamp is fixed and communicated with the catheter holder, and the other end of the second catheter is fixed and communicated with the infusion connector.

Preferably, the deformation tube is made of TPU material, and is fixed to the connection sleeve by ultrasonic welding.

Preferably, in an initial state, the outer diameter of the deformed tube is larger than the outer diameters of the first conduit and the second conduit, and the cross sections of the first conduit and the second conduit are always the same.

Preferably, the flow stop clip has an elastic arm and a fixed arm that can be engaged with each other, and the connection between the upper and lower ends of the elastic arm and the fixed arm has a perforation through which the long conduit passes, and the inner side of the fixed arm is provided There is an elastic block, the inner side of the elastic arm is provided with a protrusion, when the elastic arm and the fixed arm are engaged, the protrusion defines the long conduit between it and the elastic block.

Preferably, the inner side of the fixed arm is provided with two limit blocks, the elastic block is clamped between the two limit blocks, and the extension end of the limit block has an outer surface with the long conduit. Curved notches with matching contours to secure the position of long catheters.

Preferably, the shape of the elastic block is a rectangle, a circle, a triangle or an irregular shape.

Preferably, the rear end of the elastic arm has a convex outer block, the rear end of the fixed arm is tilted outward, and the inner wall of the bent portion between the rear end and the fixed arm body is provided with a The inner clamping block can be clamped with the outer clamping block; a set of convex ribs are arranged on the outer sides of the fixed arm and the elastic arm.

Preferably, there are two inner clamping blocks.

Preferably, an isolation plug is provided in the inner cavity of the needle hub, and the isolation plug is located at the rear end of the needle hub.

The beneficial effects of the present invention are mainly reflected in:

1. An inflatable and deformable deformation tube is connected between the first catheter and the second catheter to provide continuous positive pressure to keep the liquid medicine inside the catheter in a flowing state all the time, so as to avoid the formation of thrombus on the top or inside of the catheter and cause medical accidents;

2. The deformation tube is made of TPU material, so that it has a certain elasticity, can be expanded to a certain extent, and generate a continuous positive pressure inside the catheter in a sealed state;

3. The diameter of the deformation tube is larger than that of the first conduit and the second conduit, which can retain a certain amount of medicinal liquid to ensure that there is always sufficient medicinal liquid flow inside the conduit;

4. Ultrasonic welding of the deformed tube and the connecting sleeve can ensure the tightness between the two, and the connecting sleeve can improve the strength of the deformed tube, so that the deformed tube can be effectively connected with the first conduit and the second conduit;

5. The diameters of the first conduit and the second conduit are the same, so that the connecting sleeves at both ends of the deformed tube can be kept the same, which facilitates processing and production and reduces production costs;

6. The elastic block is made of TPU material, which has a certain elasticity to shrink, so that after the stop clamp tightens the long catheter, the long catheter and the elastic block are in flexible contact, which will not be caused by the stop clamp. Cut off the flow, the elastic block can make the liquid inside the long catheter flow slowly at a very low flow rate;

7. The stop clip is provided with two inner blocks, so that the stop clip can not only clamp the first conduit, stop the flow of the liquid medicine, and facilitate injection, but also can generate positive pressure to ensure the continuous flow of the liquid medicine;

8. An anti-needle protection component is arranged between the catheter holder and the needle tube holder to ensure that the needle tube is closed after use to prevent it from protruding and accidentally injuring medical staff, thereby improving the safety of the present invention.

Description of drawings

The technical scheme of the present invention will be further described below in conjunction with the accompanying drawings:

Fig. 1: the schematic diagram of the embodiment of the present invention;

Figure 2: a cross-sectional view of an embodiment of the present invention;

Figure 3: a schematic diagram of another angle of the embodiment of the present invention;

Figure 4: Enlarged view of part A in Figure 2;

Figure 5: Enlarged view of part B in Figure 2.

Detailed ways

The present invention will be described in detail below with reference to the specific embodiments shown in the accompanying drawings. However, these embodiments are not limited to the present invention, and structural, method, or functional transformations made by those of ordinary skill in the art based on these embodiments are all included in the protection scope of the present invention.

In the description of the scheme, it should be noted that the terms "center", "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", " The orientation or positional relationship indicated by "inside", "outside", etc. is based on the orientation or positional relationship shown in the drawings, which is only for convenience and simplification of description, rather than indicating or implying that the indicated device or element must have a specific orientation , constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention. Furthermore, the terms "first", "second", and "third" are used for descriptive purposes only and should not be construed to indicate or imply relative importance. In addition, in the description of the solution, with reference to the operator, the direction close to the operator is the proximal end, and the direction away from the operator is the distal end.

As shown in FIG. 1 to FIG. 5, the present invention discloses a continuous positive pressure intravenous indwelling needle, which includes a catheter assembly and a needle tube assembly that are connected to each other. The catheter 2, the needle tube assembly at least includes a needle tube seat 3 and a needle tube 4, the proximal end of the needle tube 4 is inserted into the needle tube seat 3 and fixed to each other, and the distal end of the needle tube 4 passes through the catheter 2 The hollow inside of the catheter holder 1 is connected to the infusion connector 6 through a positive pressure component, and the positive pressure component is a deformed tube 501 made of elastic medical materials, and the two ends of the deformed tube 501 are respectively A first conduit 503 and a second conduit 504 are fixed through the connecting sleeve 502 , the first conduit 503 is provided with a flow stopper 8 which is in flexible contact therewith, and the other end of the first conduit 503 is fixed and communicated with the conduit holder 1 . The other end of the second conduit 504 is fixed and communicated with the infusion connector 6 . An inflatable and deformable deformation tube 501 is connected between the first conduit 503 and the second conduit 504, so that the first conduit 503, the deformation tube 501 and the second conduit 504 are arranged in a continuous manner, in line with the flow direction of the medicinal liquid, It is ensured that the liquid medicine will pass through the deformation tube 501 during the circulation process, and the deformation tube 501 will be expanded, so as to provide continuous positive pressure so that the liquid medicine inside the catheter 2 will always maintain a flowing state, so as to avoid the leakage of the catheter 2. A blood clot forms on the top or inside, causing medical malpractice.

In a preferred embodiment, the deformation tube 501 is made of TPU material, and is fixed to the connection sleeve 502 by ultrasonic welding. Ultrasonic welding can ensure a better connection between the deformation tube 501 and the connection sleeve 502. Reliable and stable, not easy to break. The deformable tube 501 is made of TPU material, so that it has a certain elasticity, and can be expanded to a certain extent, so as to generate a continuous positive pressure on the inside of the catheter 2 in a sealed state. The setting of the connecting sleeve 502 improves the strength of the two ends of the deformed tube 501, which facilitates the fixing between the deformed tube 501 and the first conduit 503 and the second conduit 504. In other feasible embodiments, the The deformation tube 501 can also be fixedly connected with the connecting sleeve 502 in other feasible ways, such as bonding.

As shown in FIG. 1 , in the initial state, the outer diameter of the deformation tube 501 is larger than the outer diameters of the first conduit 503 and the second conduit 504 , and the diameter of the deformation tube 501 is larger than that of the first conduit 503 and the second conduit 504 . In the second conduit 504 , in a sealed structure, a certain amount of medicinal liquid can be retained in the deformation tube 501 , so as to ensure that there is always enough medicinal liquid to flow inside the conduit 2 . The cross sections of the first conduit 503 and the second conduit 504 are always the same, which makes the connection sleeves 502 on both sides of the deformed tube 501 consistent, which facilitates processing and reduces production costs. When the deformed tube 501 is in use, its diameter will become larger due to expansion, as shown in FIG. 2 and FIG. 3 .

As shown in FIG. 2 to FIG. 5 , the flow stop clip 8 has elastic arms 801 and fixed arms 802 that can be engaged with each other, and the connection between the upper and lower ends of the elastic arms 801 and the fixed arms 802 Through the through hole 810, the inner side of the fixed arm 802 is provided with an elastic block 803, and the inner side of the elastic arm 801 has a convex block 804. When the elastic arm 801 and the fixed arm 802 are engaged, the convex block 804 defines the long conduit 5 between it and the elastic block 803 . In this preferred embodiment, the elastic block 803 is made of TPU material, and has a certain elasticity to shrink, so that after the stopper 8 tightens the long pipe 5, the long pipe 5 and the elastic block There is a flexible contact between the 803, which will not be interrupted by the stop clip 8, and the elastic block 803 can make the medicinal liquid in the long conduit 5 flow continuously and slowly at a very low flow rate, In order to avoid the formation of thrombus after the blood backflow in the catheter 2 has stopped. In this preferred embodiment, the elastic block 803 is a rectangle. In other feasible embodiments, the elastic block 803 may be any suitable shape such as a square, a circle, and an ellipse.

In order to fix the elastic block 803 , two limit blocks 805 are disposed on the inner side of the fixing arm 802 , and the elastic block 803 is clamped between the two limit blocks 805 . Further, the extension end of the limiting block 805 has an arc-shaped notch 806 that matches the outer contour of the long pipe 5 to fix the position of the long pipe 5 and ensure that the long pipe 5 can be connected with the elastic block. 803 to prevent the long conduit 5 from deflecting to the outside of the stop clip 8 .

In this preferred embodiment, the rear end of the elastic arm 801 has a convex outer blocking block 807 , the rear end of the fixing arm 802 is tilted outward, and the rear end of the elastic arm 802 is positioned between the body of the fixing arm 802 . An inner clamping block 808 that can be clamped with the outer clamping block 807 is provided on the inner wall of the bending portion. The elastic arm 801 and the fixed arm 802 are fastened together by the snap connection between the outer clamping block 807 and the inner clamping block 808 .

As shown in FIG. 5 , there are two inner locking blocks 808 in this preferred embodiment, so that the outer locking block 807 can be arbitrarily buckled on one of the inner locking blocks 808 . This allows the stop clip 8 to not only clamp the first conduit 503 to stop the flow of the medicinal solution in the conduit 2 to facilitate the injection operation, but also generate positive pressure to ensure that the medicinal solution in the conduit 2 continues to flow. flow. In other feasible embodiments, the fixing arm 802 may also be provided with multiple stages of the inner clamping blocks 808, so that the stop clip 8 has multiple gear positions to adapt to the first conduits 503 of different diameters. The flow rate of the liquid medicine inside the first conduit 503 is further controlled.

In addition, a set of protruding ribs 809 are provided on the outer sides of the fixed arm 802 and the elastic arm 801 . The protruding ribs 809 can enhance the frictional force of the outer side walls of the fixing arm 802 and the elastic arm 801, so as to facilitate the operation and use of the operator in practice.

In order to improve the safety of the present invention, an anti-needle-stick protection component is provided between the catheter hub 1 and the needle tube holder 3 , and the needle-stick prevention component includes a protection seat 9 with a hollow structure. The protection seat A movable baffle 10 is arranged in the hollow of the The axis of 4 does not coincide with the axis of the insertion hole, so that the needle tube 4 cannot be pierced again after being separated from the movable baffle 10, so as to ensure that the needle tube 4 will not be extended by mistake after use. stab medical staff to improve its safety.

Specifically, as shown in FIG. 4 , the front end of the hollow interior of the protective seat 9 has a step 901 , the height of the left end of the step 901 is greater than the height of the right end thereof, and the movable blocking piece 10 is arranged on the left end of the step 901 And its height is smaller than the left end of the step 901 . The existence of the step 901 can define the position of the movable blocking piece 10 to ensure that the needle tube 4 is separated from the movable blocking piece 10 after retreating. In other feasible embodiments, the anti-needle protection component can also adopt other structures that can close the needle tube 4 , for example, a movable block with an outer diameter smaller than its inner diameter is arranged inside the protection seat 9 to block the The extension of the needle tube 4.

Further, as shown in FIG. 4 , the needle tube 4 has a concave portion 401 , and the inner wall of the hollow interior of the protective seat 9 has a convex point 902 adapted to the concave portion 401 , and the convex point 902 is compatible with the The concave portion 401 is snapped. Such a structure makes it impossible for the needle tube 4 to be pulled out from the protective seat 9 after the convex point 902 is engaged with the concave portion 401 , which can further ensure that the needle tube 4 is sealed in the protective seat 9 after use. Inside the protective seat 9, the use safety of the present invention is further improved.

In order to ensure the airtightness in the needle hub 3 , an isolation plug 11 is provided in the inner cavity of the needle hub 3 , and the isolation plug 11 is located at the rear end of the needle hub 3 . The isolation plug 11 is made of an elastic material, so that when the needle tube 4 is withdrawn, its own elasticity will close the through hole formed by the needle tube 4, so as to close the bottom of the needle tube seat 3, preventing the Leakage of medicinal solution.

In the preferred embodiment of the present invention, only the straight type infusion connector 6 is shown. In other feasible embodiments, the infusion connector 6 may also be Y-shaped, and may have two ports.

The working principle of the present invention is:

First, after the disinfection is completed, the needle tube 4 and the catheter 2 are simultaneously pierced into the blood vessel of the patient;

Next, the needle hub 3 is pulled backwards to separate it from the catheter hub 1, and the needle tube 4 is pulled out at the same time. At this time, the catheter 2 remains in the blood vessel of the patient, and the front end of the needle tube 4 is sealed against the needle stick. in the protection component;

Then, all the catheters 2 are sent into the vein, and the catheter holder 1 is fixed on the patient's skin with adhesive tape, and then the dripping speed of the medicine is adjusted for infusion;

Finally, after the infusion is completed, the tube sealing process is performed: first, the long catheter 5 is rinsed with physiological saline, and the residual medicinal liquid in the long catheter 5 is flushed into the blood vessel; then the stop clip 8 is clamped, and the tube sealing liquid is injected to make the deformation When the tube 501 expands, due to the existence of the elastic block 803 and the inner block 808 on the stop clip 8, the sealing liquid will slowly flow into the blood vessel, so that the catheter 2 always has liquid input into the blood vessel to ensure the fluidity in the blood vessel.

It should be understood that although this specification is described in terms of embodiments, not every embodiment only includes an independent technical solution, and this description in the specification is only for the sake of clarity, and those skilled in the art should take the specification as a whole, and each The technical solutions in the embodiments can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

The series of detailed descriptions listed above are only specific descriptions for the feasible embodiments of the present invention, and they are not used to limit the protection scope of the present invention. Changes should all be included within the protection scope of the present invention.

Claims (9)

1. Continuous positive pressure venous indwelling needle, comprising an interconnected catheter assembly and a needle assembly, the catheter assembly comprising a catheter holder (1) and a catheter (2) fixed at its distal end for infusion, the needle assembly at least Comprising a needle tube seat (3) and a needle tube (4), the proximal end of the needle tube (4) is inserted into the needle tube seat (3) and fixed to each other, and the distal end of the needle tube (4) passes through the catheter The hollow interior of (2) extends out, and is characterized in that: one side of the catheter holder (1) is connected to the infusion connector (6) through a positive pressure component, and the positive pressure component is a deformed tube made of elastic medical materials. (501), the two ends of the deformation tube (501) are respectively fixed with a first conduit (503) and a second conduit (504) through a connecting sleeve (502), and the first conduit (503) is provided with a The other end of the flexible contact stop clip (8) is fixed and communicated with the catheter holder (1), and the other end of the second catheter (504) is fixed and communicated with the infusion connector (6). 2 . The continuous positive pressure venous indwelling needle according to claim 1 , wherein the deformation tube ( 501 ) is made of TPU material, and is fixed to the connecting sleeve ( 502 ) by ultrasonic welding. 3 . 3. The continuous positive pressure venous indwelling needle according to claim 1, characterized in that: in an initial state, the outer diameter of the deformed tube (501) is larger than that of the first conduit (503) and the second conduit (504) The outer diameter of the first conduit (503) and the second conduit (504) are always the same. 4. The continuous positive pressure venous indwelling needle according to any one of claims 1 to 3, wherein the stop clip (8) has an elastic arm (801) and a fixed arm (802) that can be snapped together, The connection between the upper and lower ends of the elastic arm (801) and the fixed arm (802) has a through hole (810) through which the long conduit (5) passes, and an elastic block (803) is provided on the inner side of the fixed arm (802). ), the inner side of the elastic arm (801) has a protrusion (804), when the elastic arm (801) and the fixed arm (802) are engaged, the protrusion (804) will hold the long conduit (804). 5) Defined between it and the elastic block (803). 5 . The continuous positive pressure venous indwelling needle according to claim 4 , wherein two limit blocks ( 805 ) are arranged on the inner side of the fixed arm ( 802 ), and the elastic blocks ( 803 ) are clamped on the inner side of the fixed arm ( 802 ). Between the two limiting blocks (805), the extending end of the limiting block (805) has an arc-shaped notch (806) matching the outer contour of the long conduit (5), so as to fix the long conduit (5) Location. 6. The continuous positive pressure venous indwelling needle according to claim 5, characterized in that: the shape of the elastic block (803) is a rectangle, a circle, a triangle or an irregular shape. 7. The continuous positive pressure venous indwelling needle according to claim 6, characterized in that: the tail end of the elastic arm (801) has a convex outer block (807), and the tail end of the fixed arm (802) The end is tilted outward, and the inner wall of the bent portion between the rear end and the body of the fixing arm (802) is provided with an inner clamping block (808) that can be clamped with the outer clamping block (807); so A set of protruding ribs (809) are provided on the outer sides of the fixed arm (802) and the elastic arm (801). 8. The continuous positive pressure venous indwelling needle according to claim 7, characterized in that: there are two inner blocks (808). 9 . The continuous positive pressure intravenous indwelling needle according to claim 1 , wherein an isolation plug ( 11 ) is provided in the inner cavity of the needle tube seat ( 3 ), and the isolation plug ( 11 ) is located in the needle tube seat. 10 . (3) at the tail end.

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