Anti-reflux exhaust type indwelling needle

Abstract

The present invention relates to an anti-reflux exhaustable indwelling needle, comprising an indwelling needle body, a connecting tube and a liquid inlet three-way tube, characterized in that: an exhaust device and an anti-reflux switch device are provided on the connecting tube. The present invention has an ingenious structure and a reasonable design. By arranging an exhaust device and an anti-reflux switch device on the connecting tube of the indwelling needle body, the exhaust device can exhaust the air entering the indwelling needle, avoid the occurrence of air entering the vein, reduce medical disputes, and relieve patients of psychological pressure. When intravenous infusion is not performed, the anti-reflux switch device can be turned on to prevent blood from flowing back, increase the use time of the indwelling needle, and reduce the formation of thrombus.

Description

Technical Field

[0001] The invention relates to an indwelling needle, in particular to an anti-reflux exhaustable indwelling needle, belonging to the technical field of medical devices. Background Art

[0002] The use of intravenous indwelling needles can reduce the pain caused by repeated punctures and protect the veins. However, after the conventional indwelling needle is inserted, if air enters the indwelling needle, the air cannot be discharged. The air bubbles entering the veins will mainly cause adverse psychological effects on patients and cause medical disputes. At present, patients' self-protection awareness is constantly increasing, and their requirements for medical care services are getting higher and higher. Patients often call nurses to remove bubbles. Even if the nurses explain that small bubbles have no effect on the human body, it is often difficult to get the patient's understanding. Sometimes a new infusion set needs to be replaced and the vein needs to be re-punctured. Moreover, although a trace amount of air entering the human body will not cause serious physiological dysfunction, it is not allowed by the operating procedures for air to enter the human body during infusion. Some patients will raise a series of questions about this, causing medical disputes. Therefore, reducing the amount of air entering the blood vessels during infusion will reduce the occurrence of medical disputes.

[0003] In addition, since the indwelling needle is placed in the patient's blood vessel, blood often flows back into the indwelling needle as the patient's limbs move, which may form a thrombus, making the indwelling needle unusable and requiring re-puncture, causing more pain to the patient and increasing the workload of medical staff. An anti-reflux switch device is installed at the top of the indwelling needle to prevent blood from flowing back, which can increase the use time of the indwelling needle and reduce the formation of thrombus. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art and provide an anti-reflux exhaustable indwelling needle with an ingenious structure and reasonable design, which can effectively exhaust air and prevent blood reflux, thereby reducing the workload of nurses.

[0005] According to the technical solution provided by the present invention: an anti-reflux exhaustable indwelling needle comprises an indwelling needle body, a connecting tube and a liquid inlet three-way tube, characterized in that: an exhaust device and an anti-reflux switch device are provided on the connecting tube.

[0006] As a further improvement of the present invention, the exhaust device includes a shell, a bracket, an exhaust filter membrane, a liquid inlet pipe and a liquid outlet pipe; the shell is a flat shape with a hollow interior, and a liquid inlet pipe and a liquid outlet pipe mounting hole connected to the inner cavity space of the shell are provided on the peripheral wall of the shell, and a liquid inlet through hole is provided in the center of the liquid inlet pipe; the bracket is arranged in the inner cavity of the shell, and the bracket includes an annular outer ring and an annular inner ring, the two ends of the annular outer ring are tightly abutted against the two side walls of the shell and are sealed, a first flow gap is left between the outer peripheral surface of the annular outer ring and the inner surface of the peripheral wall of the shell, and a plurality of first liquid inlets connected to the first flow gap are spaced apart on the peripheral wall of the annular outer ring; the annular inner ring is concentrically arranged in the annular outer ring A second flow gap is left between the outer surface of the annular inner ring and the outer surface of the annular outer ring, and a plurality of second liquid inlets connected to the second flow gap are spaced apart on the circumferential wall of the annular inner ring, and the plurality of second liquid inlets and the plurality of first liquid inlets are staggeredly distributed in the circumferential direction; the liquid outlet pipe is arranged along the radial direction of the annular outer ring and the annular inner ring and is integrally connected with the annular outer ring and the annular inner ring, the outer part of the liquid outlet pipe passes through the liquid outlet pipe mounting hole installed on the shell, a liquid outlet through hole is arranged at the center of the liquid outlet pipe, and the inner end of the liquid outlet through hole is connected to the internal space of the annular inner ring; an exhaust port is arranged at a position on the side wall of the shell corresponding to the internal space of the annular inner ring, and the exhaust filter membrane is arranged at the exhaust port.

[0007] As a further improvement of the present invention, the side wall of the shell on which the exhaust port is arranged is designed to be convex, and the exhaust port is arranged at the center of the convex side wall.

[0008] As a further improvement of the present invention, a particle filtering membrane is combined on the outer surface of the annular outer ring and / or the inner surface of the annular inner ring.

[0009] As a further improvement of the present invention, the shell includes a shell body and a shell cover, a connecting groove is provided at the opening of the shell body, a connecting convex ring is provided at the edge of the shell cover, and the connecting convex ring is embedded in the connecting groove.

[0010] As a further improvement of the present invention, the width of the first circulation gap is greater than the width of the second circulation gap.

[0011] As a further improvement of the present invention, the first flow gap is 1-2 mm, and the second flow gap is 0.5-2 mm.

[0012] As a further improvement of the present invention, the anti-backflow switch device includes a switch seat, a switch rod and a switch knob. A through groove is provided in the switch seat, and the connecting pipe is inserted into the through groove. A push rod cavity is provided next to the through groove, which is perpendicular to the through groove and interconnected with the through groove. The switch rod is threadedly installed in the push rod cavity, and a switch knob is installed at the end of the switch rod, and the head end of the switch rod faces the connecting pipe.

[0013] Compared with the prior art, the present invention has the following advantages:

[0014] 1) The present invention has an ingenious structure and a reasonable design. By arranging an exhaust device and an anti-reflux switch device on the connecting tube of the indwelling needle body, the exhaust device can exhaust the air entering the indwelling needle, avoiding the occurrence of air entering the vein, reducing medical disputes, and freeing patients from psychological pressure. When intravenous infusion is not performed, the anti-reflux switch device can be turned on to prevent blood from flowing back, thereby increasing the use time of the indwelling needle and reducing the formation of thrombus.

[0015] 2) The exhaust device of the present invention has an ingenious structure. When the medicine liquid flows through the exhaust device, the bubbles in the medicine liquid will automatically gather and be brought into the annular inner ring due to the capillary phenomenon during the circulation of the medicine liquid. After entering the internal space of the annular inner ring, the bubbles are discharged through the exhaust filter membrane at the exhaust port, and the exhaust is convenient, fast and efficient.

[0016] 3) The anti-backflow switch of the present invention can effectively clamp the connecting pipe to prevent backflow, and is securely locked so as not to be accidentally opened. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic structural diagram of an embodiment of the present invention.

[0018] Figure 2 for Figure 1 An enlarged schematic diagram of the structure of the exhaust device.

[0019] Figure 3 for Figure 2 AA section view in.

[0020] Figure 4 for Figure 2 Schematic diagram of the exhaust system's exploded structure.

[0021] Figure 5 for Figure 1 An enlarged cross-sectional view of the structure at the medium anti-reflux switch device.

[0022] Description of the reference numerals: 1-indwelling needle body, 2-connecting tube, 3-liquid inlet three-way tube, 4-exhaust device, 4.1-housing, 4.1.1-housing body, 4.1.1a-connecting groove, 4.1.2-housing upper cover, 4.1.2a-connecting convex ring, 4.1a-exhaust port, 4.2-bracket, 4.2.1-annular outer ring, 4.2.2-annular inner ring, 4.2.3-first flow gap, 4 .2.4-first liquid inlet, 4.2.5-second flow gap, 4.2.6-second liquid inlet, 4.3-exhaust filter membrane, 4.4-liquid inlet pipe, 4.4a-liquid inlet through hole 4.5-liquid outlet pipe, 4.5a-liquid outlet through hole, 5-anti-backflow switch device, 5.1-switch seat, 5.1a-through groove, 5.1b-push rod cavity, 5.2-switch rod, 5.3-switch knob, 6-particle filter membrane. DETAILED DESCRIPTION

[0023] The present invention will be further described below in conjunction with specific drawings and embodiments.

[0024] like Figure 1 As shown, the embodiment discloses an anti-reflux exhaustable indwelling needle, comprising an indwelling needle body 1, a connecting tube 2 and a liquid inlet three-way tube 3, wherein the connecting tube 2 is provided with an exhaust device 4 and an anti-reflux switch device 5. By providing the exhaust device 4, the air entering the indwelling needle can be exhausted, thereby avoiding the occurrence of air entering the vein, reducing medical disputes, and eliminating psychological pressure on the patient. By providing the anti-reflux switch device 5, the anti-reflux switch device 5 can be opened when intravenous infusion is not performed, so that the blood will not flow back, the use time of the indwelling needle is increased, and the formation of thrombus is reduced.

[0025] The exhaust device 4 in the present invention can adopt conventional components with exhaust functions in the prior art, such as a precision liquid medicine filter with exhaust function. However, the function of the existing precision liquid medicine filter is mainly to filter the particles in the liquid medicine. According to the design principle, the cross-section of the precision liquid medicine filter is larger than the cross-section of the infusion tube. This is mainly to slow down the flow rate and reduce the pressure after the liquid medicine flows into the precision liquid medicine filter, so that the force of the liquid medicine pushing the filter membrane is reduced, so that the particles in the liquid medicine are blocked by the filter membrane under certain pressure conditions to prevent the particles from entering the human body. If a precision liquid medicine filter is used as the exhaust device 4, since there will be air occupying it, the area of ​​the filter membrane in the precision liquid medicine filter will be reduced, which will increase the speed of the precision liquid medicine filter, reduce the design requirements, and thus reduce the role of the precision liquid medicine filter, resulting in some particles passing through the filter membrane 6 into the human body, causing harm to the patient.

[0026] In order to overcome the above-mentioned defects of the existing precision liquid medicine filter, this embodiment provides a method such as Figure 2 to Figure 4The exhaust device 4 shown in the figure comprises a housing 4.1, a bracket 4.2, an exhaust filter membrane 4.3, a liquid inlet pipe 4.4 and a liquid outlet pipe 4.5; the housing 4.1 is a flat shape with a hollow interior, and a liquid inlet pipe 4.4 and a liquid outlet pipe mounting hole are provided on the peripheral wall of the housing 4.1 and are communicated with the inner cavity space of the housing 4.1, and a liquid inlet through hole 4.4a is provided in the center of the liquid inlet pipe 4.4; the bracket 4.2 is arranged in the inner cavity of the housing 4.1, and the bracket 4.2 comprises an annular outer ring 4.2.1 and an annular inner ring 4.2.2, the two ends of the annular outer ring 4.2.1 are tightly against the two side walls of the shell 4.1 and are sealed, a first flow gap 4.2.3 is left between the outer peripheral surface of the annular outer ring 4.2.1 and the inner surface of the peripheral wall of the shell 4.1, and a plurality of first liquid inlets 4.2.4 connected to the first flow gap 4.2.3 are arranged on the peripheral wall of the annular outer ring 4.2.1 at intervals; the annular inner ring 4.2.2 is concentrically arranged in the annular outer ring 4.2.1, and the annular inner ring 4. A second flow gap 4.2.5 is left between the outer surface of the annular outer ring 4.2.2 and the outer surface of the annular outer ring 4.2.1. A plurality of second liquid inlets 4.2.6 connected to the second flow gap 4.2.5 are arranged at intervals on the peripheral wall of the annular inner ring 4.2.2. The plurality of second liquid inlets 4.2.6 and the plurality of first liquid inlets 4.2.4 are arranged in a staggered distribution in the circumferential direction. The liquid outlet pipe 4.5 is arranged along the radial direction of the annular outer ring 4.2.1 and the annular inner ring 4.2.2 and is connected to the annular outer ring 4.2.1. The ring 4.2.1 and the annular inner ring 4.2.2 are integrally connected, the outer portion of the liquid outlet pipe 4.5 passes through the liquid outlet pipe mounting hole installed on the shell 4.1, a liquid outlet through hole 4.5a is provided at the center of the liquid outlet pipe 4.5, and the inner end of the liquid outlet through hole 4.5a is communicated with the internal space of the annular inner ring 4.2.2; an exhaust port 4.1a is provided at a portion of the side wall of the shell 4.1 corresponding to the internal space of the annular inner ring 4.2.2, and the exhaust filter membrane 4.3 is arranged at the exhaust port 4.1a.

[0027] With such arrangement, when in use, the housing 4.1 is placed with the exhaust port 4.1a facing upwards, and the liquid medicine flows into the housing 4.1 through the liquid inlet through hole 4.4a and is distributed in the first circulation gap 4.2.3, then flows into the first circulation gap 4.2.5 through the first liquid inlet 4.2.4, and then flows into the internal space of the annular inner ring 4.2.2 from the second liquid inlet 4.2.6. In this process, since the plurality of second liquid inlets 4.2.6 and the plurality of first liquid inlets 4.2.4 are arranged in a staggered distribution in the circumferential direction, the bubbles in the liquid medicine will automatically gather and be brought into the annular inner ring 4.2.2 due to the capillary phenomenon when the liquid medicine circulates, and then be discharged through the exhaust filter membrane 4.3 at the exhaust port 4.1a after entering the internal space of the annular inner ring 4.2.2, so that the exhaust is convenient, fast and efficient.

[0028] like Figure 2 , Figure 4As shown, in this embodiment, the side wall of the housing 4.1 provided with the exhaust port 4.1a is set to be convex, and the exhaust port 4.1a is set at the center of the convex side wall. In this way, since the density of air is less than that of liquid, when the air is collected in the annular inner ring 4.2.2, it will be located at the upper part of the internal space of the annular inner ring 4.2.2, and the above-mentioned structure with low surroundings and high center is easier to collect air, and also provides a reasonable structural guarantee for the smooth discharge of air.

[0029] like Figure 3 As shown, in this embodiment, the outer surface of the annular outer ring 4.2.1 is combined with a particle filter membrane 6. In this way, the exhaust device 4 can also filter particles, thereby improving the safety of infusion. In actual manufacturing, the inner surface of the annular inner ring 4.2.2 can also be combined with a particle filter membrane 6. The particle filter membrane 6 can be combined with the annular outer ring 4.2.1 and the annular inner ring 4.2.2 by bonding or welding.

[0030] like Figure 2 , Figure 4 As shown, in this embodiment, the housing 4.1 includes a housing body 4.1.1 and a housing cover 4.1.2, a connecting groove 4.1.1a is provided at the opening of the housing 4.1, and a connecting convex ring 4.1.2a is provided at the edge of the housing cover 4.1.2, and the connecting convex ring 4.1.2a is embedded in the connecting groove 4.1.1a. With such a configuration, the housing body 4.1.1 and the housing cover 4.1.2 can be assembled more accurately, and the sealing performance after connection is also better.

[0031] like Figure 3 As shown, in this embodiment, the width of the first circulation gap 4.2.3 is greater than the width of the second circulation gap 4.2.5. In this way, bubbles in the circulation process of the liquid medicine can be gradually gathered in order from large to small, so that the air can be discharged more efficiently. The first circulation gap 4.2.3 is 1-2mm, preferably 1.5mm; the second circulation gap 4.2.5 is 0.5-2mm, preferably 1mm.

[0032] The anti-backflow switch device 5 of the present invention can adopt conventional components with a shutoff function in the prior art, such as a speed regulator. However, the existing speed regulator has the problem of unreliable locking and may be accidentally opened, resulting in failure to achieve the anti-backflow function.

[0033] In order to overcome the above-mentioned defects of the existing speed regulator, this embodiment provides a Figure 5The anti-backflow switch device 5 shown comprises a switch seat 5.1, a switch rod 5.2 and a switch knob 5.3. A through groove 5.1a is provided in the switch seat 5.1. The connecting pipe 2 is inserted into the through groove 5.1a. A push rod cavity 5.1b is provided beside the through groove 5.1a and is perpendicular to and connected to the through groove 5.1a. The switch rod 5.2 is threadedly installed in the push rod cavity 5.1b. The switch knob 5.3 is installed at the end of the switch rod 5.2. The head end of the switch rod 5.2 faces the connecting pipe 2. With such a configuration, the switch rod 5.2 can be moved axially by rotating the switch knob 5.3. When the switch rod 5.2 moves toward the connecting pipe 2, the connecting pipe 2 is gradually squeezed and flattened until it is closed; conversely, when the switch rod 5.2 moves away from the connecting pipe 2, the connecting pipe 2 is opened. Such a structure can effectively clamp the connecting pipe 2 to prevent backflow.

[0034] The above description is only a preferred embodiment of the present invention, and the above specific embodiment is not intended to limit the present invention. Various deformations and modifications may occur within the scope of the technical concept of the present invention, and any modification, modification or equivalent replacement made by a person of ordinary skill in the art based on the above description shall fall within the scope of protection of the present invention.

Claims

1. An anti-reflux exhaustable indwelling needle, comprising an indwelling needle body (1), a connecting tube (2) and a liquid inlet three-way tube (3), characterized in that: The connecting pipe (2) is provided with an exhaust device (4) and an anti-backflow switch device (5); the exhaust device (4) comprises a shell (4.1), a bracket (4.2), an exhaust filter membrane (4.3), a liquid inlet pipe (4.4) and a liquid outlet pipe (4.5); the shell (4.1) is flat and hollow inside, and a liquid inlet pipe (4.4) and a liquid outlet pipe mounting hole that are connected to the inner cavity space of the shell (4.1) are provided on the peripheral wall of the shell (4.1), and a liquid inlet through hole (4.4a) is provided at the center of the liquid inlet pipe (4.4); the bracket (4.2) is arranged in the inner cavity of the shell (4.1), and the bracket (4.2) comprises an annular outer ring (4.2.1) and an annular inner ring (4.2.2). The annular outer ring (4.2.2) has two ends that are tightly against and sealed against two side walls of the shell (4.1), a first flow gap (4.2.3) is left between the outer circumferential surface of the annular outer ring (4.2.1) and the inner surface of the circumferential wall of the shell (4.1), and a plurality of first liquid inlets (4.2.4) that are connected to the first flow gap (4.2.3) are provided at intervals on the circumferential wall of the annular outer ring (4.2.1); the annular inner ring (4.2.2) is concentrically arranged in the annular outer ring (4.2.1), and a second flow gap (4.2.4) is left between the outer surface of the annular inner ring (4.2.2) and the outer surface of the annular outer ring (4.2.1). .2.5), a plurality of second liquid inlets (4.2.6) connected to the second flow gap (4.2.5) are arranged at intervals on the peripheral wall of the annular inner ring (4.2.2), and the plurality of second liquid inlets (4.2.6) and the plurality of first liquid inlets (4.2.4) are arranged in a staggered distribution in the circumferential direction; a particle filtering membrane (6) is combined on the outer surface of the annular outer ring (4.2.1) and the inner surface of the annular inner ring (4.2.2); the liquid outlet pipe (4.5) is arranged along the radial direction of the annular outer ring (4.2.1) and the annular inner ring (4.2.2) and is integrally connected to the annular outer ring (4.2.1) and the annular inner ring (4.2.2), The outside of the liquid outlet pipe (4.5) passes through the liquid outlet pipe installation hole installed on the shell (4.1); a liquid outlet through hole (4.5a) is provided at the center of the liquid outlet pipe (4.5); the inner end of the liquid outlet through hole (4.5a) is connected to the internal space of the annular inner ring (4.2.2); an exhaust port (4.1a) is provided at a position on the side wall of the shell (4.1) corresponding to the internal space of the annular inner ring (4.2.2), and the exhaust filter membrane (4.3) is arranged at the exhaust port (4.1a); the side wall of the shell (4.1) provided with the exhaust port (4.1a) is set to be convex, and the exhaust port (4.1a) is arranged at the center of the convex side wall.

2. The anti-reflux exhaustable indwelling needle according to claim 1, characterized in that: The shell (4.1) comprises a shell body (4.1.1) and a shell cover (4.1.2); a connecting groove (4.1.1a) is provided at the opening of the shell (4.1); a connecting convex ring (4.1.2a) is provided at the edge of the shell cover (4.1.2); the connecting convex ring (4.1.2a) is embedded in the connecting groove (4.1.1a).

3. The anti-reflux exhaustable indwelling needle according to claim 1, characterized in that: The width of the first circulation gap (4.2.3) is greater than the width of the second circulation gap (4.2.5).

4. The anti-reflux exhaustable indwelling needle according to claim 3, characterized in that: The first flow gap (4.2.3) is 1-2 mm, and the second flow gap (4.2.5) is 0.5-2 mm.

5. The anti-reflux exhaustable indwelling needle as claimed in claim 1, wherein the anti-reflux switch device (5) comprises a switch seat (5.1), a switch rod (5.2) and a switch knob (5.3), wherein a through groove (5.1a) is provided in the switch seat (5.1), wherein the connecting tube (2) is inserted into the through groove (5.1a), and a push rod cavity (5.1b) is provided beside the through groove (5.1a) and is perpendicular to and interconnected with the through groove (5.1a), wherein the switch rod (5.2) is threadedly mounted in the push rod cavity (5.1b), and a switch knob (5.3) is mounted at the end of the switch rod (5.2), and the head end of the switch rod (5.2) faces the connecting tube (2).

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