Positive-pressure tube sealing indwelling needle

Abstract

The utility model relates to the technical field of medical instruments, in particular to a positive pressure tube sealing remaining needle which comprises a puncture part and an infusion part with a positive pressure function. The infusion part comprises a first shell and an end cover, a liquid storage cavity is formed in the first shell, and a positive pressure assembly is arranged in the liquid storage cavity in a matched mode. The positive pressure assembly comprises a first column body and a second column body, the first column body is in sliding sealing fit with the liquid storage cavity, a reset element is arranged between the first column body and the end cover, and a soft film is arranged on the second column body in the infusion direction. The infusion needle can sequentially penetrate through the first column body and the soft thin film to be communicated with the puncture part. When the infusion needle is pulled out, the soft film allows the infusion needle to be separated to generate a micropore, and the first column axially slides in the liquid storage cavity along with the infusion needle. When the infusion needle is completely pulled out, under the action of the reset element, the first column body resets in the liquid storage cavity, positive pressure is generated, liquid in the liquid storage cavity is driven to continuously apply pressure through the micropores, blood backflow is prevented, and positive pressure tube sealing is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to medical instrument technical field, concretely relates to a positive pressure tube sealing indwelling needle. BACKGROUND

[0002] The venous indwelling needle is also called as the venous cannula needle, which is composed of a puncture needle and an indwelling soft needle. When puncturing, the stainless steel needle core of the puncture needle and the indwelling soft needle are inserted into the blood vessel together, and after entering the blood vessel, the stainless steel needle core is pulled out, and the soft indwelling tube is left in the blood vessel for infusion. Since the tube is left in the vein, the damage of the steel needle to the blood vessel is avoided, and the patient can move slightly with the needle. The venous indwelling needle is easy to operate, suitable for puncturing at any part, and can be used continuously or intermittently for multiple times and multiple days after one-time puncturing, which reduces the pain of repeated puncturing of the patient and the workload of the nursing staff, and is welcomed by the patients and nurses in the clinic.

[0003] However, after the existing indwelling needle completes infusion or tube sealing, blood may still flow back into the indwelling needle connector, and in severe cases, it may even flow back into the extension tube connected thereto, and due to the coagulation of blood platelets and other coagulation substances in the blood in the low-flow catheter, thrombus formation may occur, which may cause pipe blockage. In order to ensure that the catheter can be reused, sealing technology must be used to prevent pipe blockage, and "sealing" has become a special term in medical and nursing science.

[0004] The "sealing" method in the current standard method is to inject physiological saline or heparin sealing liquid into the catheter for "sealing", the principle of which is that the physiological saline or other sealing liquid is assumed to be in a static state, and the physiological saline or other sealing liquid occupies the space in the catheter lumen, so that the blood and its coagulation components cannot enter the catheter; secondly, the physiological saline in the catheter can dilute the entering coagulation substances, delaying coagulation and thrombus formation. And at the time of sealing, a large amount of thrombus will also be flushed into the blood vessels of the human body, causing very serious potential hazards, and also causing acute vascular diseases such as phlebitis, etc., which causes harm to the patient and has the defect of low medical quality. At present, in order to more conveniently implement "sealing", researchers have developed "positive pressure connectors", and through "three-pulse injection" and "positive pressure sealing" such as "pushing liquid while retreating needle", the "sealing" is completed, but the current "positive pressure connector" takes China authorized patent 202123150800.6 as an example, which is a transient positive pressure, that is, when the positive pressure connector is sealed and the infusion is completed, a short-time positive pressure will be generated, which automatically pushes the liquid in the indwelling catheter forward into the blood vessel.

[0005] However, this method cannot completely prevent blood from entering the catheter for the following reasons: First, the pressure in the peripheral veins fluctuates due to respiration and heartbeat, driving blood into the catheter and forming "backflow"; second, the patient's movement causes fluctuations in intravascular pressure, driving blood into the catheter and forming "backflow"; third, platelets, cells, and clotting substances in the blood diffuse into the "sealing fluid" filling the catheter, forming a blood clot when a certain amount is reached. Therefore, the applicant believes that the current indwelling needle structure still has room for improvement. Utility Model Content

[0006] The purpose of this invention is to provide a positive pressure sealing catheter indwelling needle to overcome the shortcomings of existing technologies.

[0007] To achieve these objectives, this application provides the following technical solution: a positive pressure sealing indwelling needle, comprising a puncture section and an infusion section with positive pressure function. The infusion section includes a first housing and an end cap. A fluid storage chamber is formed within the first housing. A positive pressure assembly is fitted within the fluid storage chamber. The positive pressure assembly includes a first column and a second column. The first column is slidably sealed to the inner wall of the fluid storage chamber. A reset element is provided between the first column and the end cap to drive the first column to move toward the second column. A soft film is provided on the second column along the infusion direction. The soft film is configured to generate micropores when the infusion needle is withdrawn. The infusion needle can pass through the first column and the soft film in sequence and communicate with the puncture section. The first column and the infusion needle are damped together. The damping value ensures that when the infusion needle is withdrawn from the infusion section, the first column can slide axially within the fluid storage chamber as the infusion needle moves.

[0008] In a preferred embodiment, the first column includes a piston portion and a tube portion, the piston portion being in sliding sealing fit with the inner wall of the first housing; the end cap is provided with an annular groove near the tube portion to accommodate the displacement generated when the tube portion moves.

[0009] In a preferred embodiment, the outer wall of the tube body is clearance-fitted with the outer wall of the annular groove, and the inner wall of the tube body is slidingly sealed with the inner wall of the annular groove.

[0010] In a preferred embodiment, the second column has a tapered structure that is wider at the top and narrower at the bottom near the liquid storage cavity, and the soft film is disposed at the bottom of the tapered structure.

[0011] In a preferred embodiment, a receiving cavity is formed between the tube body and the first housing. The reset element is disposed in the receiving cavity. When the infusion needle disengages from the piston, the piston generates positive pressure in the reservoir under the drive of the reset element.

[0012] As a preferred embodiment, the first shell is further provided with a vent hole, one end of which is communicated with the accommodating cavity, and the other end of which is communicated with external air.

[0013] As a preferred embodiment, the reset element is a spring or an elastic rubber sleeve.

[0014] As a preferred embodiment, the soft film is an elastic film.

[0015] As a preferred embodiment, the puncture part comprises a remaining needle seat and a puncture needle, one end of the remaining needle seat is communicated with a remaining hose, the other end of the remaining needle seat is communicated with the infusion part through an extension tube, and a liquid stopping clamp is further arranged outside the extension tube.

[0016] As a preferred embodiment, the first shell is further provided with a three-way joint, the infusion needle is communicated with the three-way joint after sequentially penetrating the piston part and the soft film, and the three-way joint is kept sealed by arranging a sealing plug.

[0017] Compared with the prior art, the application has the following beneficial effects:

[0018] The application improves the structure of the infusion part, when the infusion needle is pulled out, the first column body slides along the liquid storage cavity in the axial direction, and leaves a micro hole on the soft film, under the action of the reset element, the first column body is reset in the liquid storage cavity to generate a positive pressure, drives the liquid in the liquid storage cavity to continuously press the blood vessel through the micro hole of the soft film, prevents the blood in the blood vessel from flowing back to the remaining hose, and realizes the positive pressure tube sealing. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or the prior art description. Obviously, the drawings described below are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0020] Figure 1 It is an embodiment structure diagram of the positive pressure tube sealing remaining needle of the present application.

[0021] Figure 2 It is an embodiment structure diagram of the infusion part provided by the positive pressure tube sealing remaining needle of the present application.

[0022] Figure 3 It is an embodiment structure diagram of the first column body provided by the positive pressure tube sealing remaining needle of the present application.

[0023] Figure 4The second column body provided by the positive pressure pipe sealing indwelling needle of the utility model provides one kind of implementation mode structure schematic view;

[0024] Figure 5 The infusion part provided by the positive pressure pipe sealing indwinding needle of the utility model provides the structure schematic view of the infusion state of the infusion part;

[0025] Figure 6 The infusion part provided by the positive pressure pipe sealing indwinding needle of the utility model provides the structure schematic view of the infusion needle of the infusion part when being pulled out;

[0026] Figure 7 The infusion part provided by the positive pressure pipe sealing indwinding needle of the utility model provides another implementation mode structure schematic view of the infusion part;

[0027] Figure 8 The positive pressure pipe sealing indwinding needle of the utility model provides another implementation mode structure schematic view;

[0028] Puncture part;11-indwelling needle seat;12-puncture needle;13-indwelling hose;14-elongated tube;2-infusion part;21-first shell;22-end cover;23-liquid storage cavity;24-positive pressure assembly;25-three-way joint;26-containment cavity;211-vent hole;221-annular groove;241-first column body;242-second column body;243-resetting element;244-soft film;251-sealing plug;2411-piston part;2412-tube part;2421-restricted structure;3-liquid stop clamp;4-infusion needle. DETAILED DESCRIPTION

[0029] The technical scheme of the utility model will be described clearly and completely in combination with examples, obviously, the described examples are a part of the examples of the utility model, rather than all the examples. Based on the examples in the utility model, all the other examples obtained by the ordinary skilled in the art without making creative labor belong to the protection scope of the utility model.

[0030] Please see Figures 1-8The embodiment provides a positive pressure tube sealing indwelling needle, which comprises a puncture part 1 and an infusion part 2 with a positive pressure function, the infusion part 2 comprises a first shell 21 and an end cover 22, a liquid storage cavity 23 is formed in the first shell 21, a positive pressure assembly 24 is matched and arranged in the liquid storage cavity 23, the positive pressure assembly 24 comprises a first column 241 and a second column 242, the first column 241 is in sliding sealing cooperation with the inner wall of the liquid storage cavity 23, a reset element 243 is arranged between the first column 241 and the end cover 22, the reset element 243 is used for exerting a force on the first column 241 to move towards the second column 242, a soft film 244 is arranged on the second column 242 in the infusion needle insertion direction; the first column 241 is in damping cooperation with the infusion needle, and the damping value ensures that the first column 241 can slide axially in the liquid storage cavity 23 when the infusion needle is separated from the infusion part.

[0031] Please refer to Figure 5 When infusion is performed, the infusion needle 4 can be communicated with the puncture part 1 by penetrating the first column 241 and the soft film 244 along the center of the first shell 21 from the end cover 22 of the infusion part; please refer to Figure 6 When the infusion needle 4 is pulled out of the infusion part, the infusion liquid is still delivered, when the infusion needle is separated from the soft film 244, a micro hole is left on the soft film 244, the first column 241 slides axially along the liquid storage cavity 23 when the infusion needle is pulled out due to the damping cooperation between the first column 241 and the infusion needle, until the infusion needle 4 is completely separated from the first column 241, because the infusion liquid is still delivered, a certain amount of infusion liquid is accumulated in the liquid storage cavity 23, when the infusion needle 4 is separated from the first column 241, the first column 241 is reset under the action of the reset element 243 and moves towards the second column 242, a positive pressure is generated to drive the infusion liquid in the liquid storage cavity 23 to continuously press the blood vessel through the micro hole of the soft film 244, so that the blood in the blood vessel is prevented from flowing back to the puncture part, and the positive pressure tube sealing is realized. It can be understood that, when the person skilled in the art is clear about the principle of the embodiment, the flow and time of the infusion liquid in the liquid storage cavity 23 pressing the blood vessel, the pressure of the first column 241 resetting and / or the size of the micro hole on the soft film 244 are determined, and the person skilled in the art can easily replace the soft film 244 and / or adjust the reset element 243 or adjust the volume of the liquid storage cavity 23 to realize more detailed adjustment of the positive pressure tube sealing state.

[0032] As a preferred embodiment, the first column 241 comprises a piston part 2411 and a tube part 2412, and a first sealing ring is arranged between the inner wall of the first shell 21 and the piston part 2411 to reduce the risk of leakage of the infusion liquid from the gap between the inner wall of the first shell 21 and the outer wall of the piston part 2411 when the first column 241 slides. The end cover 22 is provided with an annular groove 221 near one end of the tube part 2412 for accommodating the displacement generated when the tube part 2412 moves. It can be understood that in this structure, the sliding distance of the first column 241 in the liquid storage cavity 23 can be adjusted by the depth of the annular groove 221.

[0033] As a preferred embodiment, the outer wall of the tube part 2412 is in clearance fit with the outer wall of the annular groove 221 to avoid forming a closed space and reduce the sliding resistance of the tube part 2412 in the annular groove 221. A second sealing ring is arranged between the inner wall of the tube part 2412 and the inner wall of the annular groove 221 to avoid the infusion liquid from penetrating into the cavity where the reset element 243 is located from the inner wall of the tube part 2412 and the inner wall of the annular groove 221 when sliding, thereby affecting the reset performance.

[0034] As a preferred embodiment, the second column 242 is formed with a tapered structure 2421 near one end of the liquid storage cavity 23, and the soft film 244 is arranged at the bottom of the tapered structure. The tapered design can reduce the interference of the infusion liquid during discharge, avoid the instability of the positive pressure caused by uneven liquid flow, and increase the time for the liquid storage cavity 23 to generate positive pressure.

[0035] As a preferred embodiment, the tube part 2412 and the first shell 21 form a containing cavity 26, and the reset element 243 is arranged in the containing cavity 26. The reset element 243 is a spring, and the two ends of the spring are in abutment with the piston part 2411 and the end cover 22, respectively. When the infusion needle is separated from the piston part 2411, the piston part 2411 is reset under the driving of the spring to generate positive pressure in the liquid storage cavity 23. In addition, as shown in some embodiments of the present application, the reset element 243 can be an elastic rubber sleeve, and the two ends of the elastic rubber sleeve are connected with the piston part 2411 and the second column 242, respectively. When the infusion needle is separated from the piston part 2411, the piston part 2411 is reset under the deformation tension of the elastic rubber sleeve to generate positive pressure in the liquid storage cavity 23. Figure 7

[0036] As a preferred embodiment, the first shell 21 is further provided with a vent hole 211, one end of the vent hole 211 communicates with the containing cavity 26, and the other end of the vent hole 211 communicates with the external air to avoid forming a closed space in the containing cavity 26 and affecting the generation of positive pressure.

[0037] ​As a preferred embodiment, the soft membrane 244 is an elastic soft membrane. When the infusion needle is withdrawn from the soft membrane 244, the elastic soft membrane deforms and indents in the withdrawal direction. At the instant the infusion needle is removed from the soft membrane 244, the elastic soft membrane returns to its original shape, generating an instantaneous positive pressure, allowing the infusion fluid in the puncture section 1 to enter the blood vessel. Then, when the infusion needle is removed from the first column 241, a continuous secondary positive pressure is generated. The design of the two positive pressures can more effectively reduce the thrombosis problem caused by blood reflux.

[0038] For a preferred embodiment, please refer to Figure 8 The puncture unit 1 includes an indwelling needle hub 11 and a puncture needle 12. The puncture needle 12 is used for initial puncture to enter a blood vessel or body cavity and is removed after puncture so that infusion fluid can continue to be infused through the indwelling needle hub 11. One end of the indwelling needle hub 11 is connected to an indwelling tubing 13 for indwelling in a blood vessel or body cavity for infusion. The other end of the indwelling needle hub 11 is connected to the infusion unit 2 through an extension tube 14. A stop clamp 3 is also provided outside the extension tube 14 to control or block the flow of infusion fluid to prevent the infusion fluid from being lost when infusion is not needed.

[0039] For a preferred embodiment, please refer to Figure 5 , Figure 8 The first housing 21 is also provided with a three-way connector 25. The infusion needle passes through the piston part 2411 and the soft film 244 in sequence and then communicates with the three-way connector 25. The three-way connector 25 is kept sealed by setting a sealing plug 251 to connect the infusion needle 4 with other components for injecting drugs or adding other liquids, reducing the frequency of operation of the infusion line.

[0040] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A positive pressure sealed tube indwelling needle, comprising a puncture part (1) and an infusion part (2) with positive pressure function, characterized in that, the infusion part (2) comprises a first shell (21) and an end cover (22), a liquid storage cavity (23) is formed in the first shell (21), a positive pressure assembly (24) is arranged in the liquid storage cavity (23), the positive pressure assembly (24) comprises a first column (241) and a second column (242), the first column (241) is in sliding sealing cooperation with the inner wall of the liquid storage cavity (23), a reset element (243) is arranged between the first column (241) and the end cover (22) for driving the first column (241) to move towards the second column (242), the second column (242) is provided with a soft film (244) in the infusion direction, and the soft film (244) is arranged to form a micro hole when the infusion needle (4) is pulled out, the infusion needle (4) can pass through the first column (241) and the soft film (244) in sequence and communicate with the puncture part (1); the first column (241) and the infusion needle (4) are in damping cooperation, and the damping value ensures that when the infusion needle is pulled away from the infusion part (2), the first column (241) can slide axially in the liquid storage cavity (23) while moving with the infusion needle (4).

2. The positive pressure occluding indwelling needle of claim 1, wherein, The first column (241) comprises a piston part (2411) and a tube part (2412), and the piston part (2411) is in sliding sealing cooperation with the inner wall of the first shell (21); the end cover (22) is provided with an annular groove (221) near one end of the tube part (2412) for accommodating the displacement generated when the tube part moves.

3. The positive pressure occluding indwelling needle of claim 2, wherein, The outer wall of the tube part (2412) is in clearance cooperation with the outer wall of the annular groove (221), and the inner wall of the tube part (2412) is in sliding sealing cooperation with the inner wall of the annular groove (221).

4. The positive pressure occluding indwelling needle of claim 2, wherein, The second column (242) is formed with a narrow-top-wide-bottom structure (2421) near one end of the liquid storage cavity (23), and the soft film (244) is arranged at the bottom of the structure (2421).

5. The positive pressure occluding indwelling needle of claim 2, wherein, The tube part (2412) and the first shell (21) form a containing cavity (26), and the reset element (243) is arranged in the containing cavity (26); after the infusion needle (4) is separated from the piston part (2411), the piston part (2411) generates positive pressure in the liquid storage cavity (23) under the driving of the reset element (243).

6. The positive pressure occluding indwelling needle of claim 5, wherein, The first shell (21) is further provided with a vent hole (211), one end of the vent hole (211) communicates with the containing cavity (26), and the other end of the vent hole (211) communicates with the outside air.

7. The positive pressure occluding indwelling needle of claim 2, wherein, The reset element (243) is a spring or an elastic rubber sleeve.

8. The positive pressure occluding indwelling needle of claim 2, wherein, The soft film is an elastic film.

9. The positive pressure occluding indwelling needle according to any one of claims 2 to 8, wherein The puncture part comprises an indwelling needle seat (11) and a puncture needle (12), one end of the indwelling needle seat (11) is communicated with an indwelling hose (13), the other end of the indwelling needle seat (11) is communicated with the infusion part (2) through an extension tube (14), and a liquid stopping clamp (3) is further arranged outside the extension tube (14).

10. The positive pressure occluding indwelling needle of claim 2, wherein, The first shell is further provided with a three-way joint (25), and the infusion needle (4) sequentially passes through the piston part (2411) and the soft film (244) and communicates with the three-way joint (25), and the three-way joint (25) is sealed by the sealing plug (251).

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