Filter type vein extension tube structure

Abstract

The utility model discloses a filter type vein extension tube structure, which comprises a tube body with two ends respectively being a three-way connecting end and a venous indwelling needle connecting end, and further comprises a sealing assembly arranged in the tube body and close to the three-way connecting end, the liquid inlet and the liquid outlet of the shell are respectively communicated with the corresponding parts of the pipe body positioned on the two sides of the shell; the filtering piece is arranged in the shell and is used for filtering impurity particles and air in the liquid medicine flowing into the shell; and the exhaust hole is formed in the shell and is used for exhausting air in the liquid medicine flowing into the shell. According to the filtering type vein extension tube structure, a small amount of air and small impurities possibly carried in the process of pushing and injecting medicine into the vein extension tube through the tee joint can be filtered out, the pain of a patient is reduced, and medical disputes are effectively reduced.

Description

Technical Field

[0001] This utility model relates to the field of medical technology, and in particular to a filter-type venous extension tube structure. Background Technology

[0002] In modern medical practice, intravenous extension catheters are widely used. Currently, they are typically connected between a three-way stopcock and an indwelling intravenous catheter. The three-way stopcock has three ports: one connects to the extension catheter, one connects to the infusion set, and the other is reserved for intravenous bolus administration or connection to a micro-infusion pump via a syringe pump tubing. During surgery, when medication needs to be added temporarily, a syringe is usually directly connected to one port of the three-way stopcock for injection. Because there is a gap between the syringe and the three-way stopcock connection, some air may be trapped during medication injection, resulting in some air entering the patient's body after the injection. Furthermore, since the disposable intravenous extension catheters commonly used in China are directly connected to the three-way stopcock and the patient without filtration, small amounts of air and fine impurities may be trapped during medication injection, causing pain and complications for the patient, and even leading to medical disputes. Summary of the Invention

[0003] The purpose of this invention is to solve the above-mentioned problems by providing a filtering intravenous extension tube structure that can filter out small amounts of air and fine impurities that may be trapped during the injection of drugs into the intravenous extension tube via a three-way valve, thereby reducing patient discomfort and effectively reducing the occurrence of medical disputes.

[0004] To achieve the above-mentioned objectives of this utility model, this utility model provides a filter-type intravenous extension tube structure, including a tube body with a three-way connector at one end and an indwelling intravenous needle connector at the other end. It also includes a sealing assembly disposed within the tube body and near the three-way connector. The sealing assembly includes a housing whose inlet and outlet are respectively connected to corresponding portions of the tube body located on both sides; a filter element disposed within the housing for filtering impurities and air particles from the liquid medicine flowing into the housing; and an exhaust port disposed on the housing for venting air from the liquid medicine flowing into the housing.

[0005] Preferably, the filter element includes one filter screen or two filter screens arranged in parallel within the housing.

[0006] Preferably, a breathable membrane is also provided at the vent of the housing.

[0007] Preferably, the sealing assembly further includes a baffle disposed within the housing and located on the side near the liquid outlet.

[0008] Preferably, the baffle is provided with an overflow port for the filtered medicine liquid to flow to the outlet.

[0009] Preferably, the housing is an integral structure or a split structure.

[0010] Compared with the prior art, the filter-type vein extension tube structure of this utility model has the following advantages:

[0011] This utility model's filter-type intravenous extension tube structure is simple in structure and easy to use. It can filter out small amounts of air and fine impurities that may be trapped during the injection of drugs into the intravenous extension tube through the three-way stopcock, reducing patient discomfort and effectively reducing the occurrence of medical disputes.

[0012] The present invention will now be described in detail with reference to the accompanying drawings. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of the filter-type vein extension tube of this utility model;

[0014] Figure 2 This is an exploded view of the sealing assembly of this utility model;

[0015] Figure 3 This is a three-dimensional view of the sealing assembly. Detailed Implementation

[0016] like Figure 1 The diagram shown is a structural schematic of the filter-type venous extension tube of this utility model. Figure 2 , Figure 3 The figures show structural schematic diagrams of the sealing assembly of this utility model in different states. As can be seen from the figures, the structure of the filter-type intravenous extension tube of this utility model includes: a tube body 3 with a three-way connector 2 and an intravenous indwelling needle connector 1 at its two ends; a sealing assembly 4 disposed in the tube body and close to the three-way connector; the sealing assembly includes: a housing whose inlet and outlet are respectively connected to the corresponding parts of the tube body located on both sides; a filter element disposed in the housing for filtering impurities and air particles in the liquid medicine flowing into the housing; and an exhaust hole 7 disposed on the housing for venting air in the liquid medicine flowing into the housing.

[0017] Specifically, the present invention relates to a filter-type intravenous extension tube structure comprising a tube body, with a three-way connector and an indwelling intravenous needle connector at both ends, for connecting the three-way connector and the indwelling intravenous needle respectively. A sealing assembly is provided near the three-way connector on the tube body, and a filter screen is installed within the sealing assembly. This sealing assembly may be cylindrical, with an outer diameter larger than the diameter of the tube body, and protrudes from the tube body.

[0018] The sealing assembly includes a cylindrical housing, which can be an integral structure or a split structure. The housing has a cavity in the middle and inlet connectors 6 and outlet connectors 12 that extend outwards on both sides.

[0019] When the shell adopts a split structure, such as Figure 2 , Figure 3 As shown, it includes a first housing 8 and a second housing 13 detachably connected to the first housing. The first housing has an outwardly protruding liquid inlet connector 6, and the second housing has an outwardly protruding liquid outlet connector 12 opposite to the liquid inlet connector. The two housings are sealed with a sealing ring 14 after being connected.

[0020] Regardless of whether the casing adopts a one-piece or split structure, during assembly, the casing is placed in the middle of the tube body. The inlet connector is connected to the first part of the tube body, and the outlet connector is connected to the second part of the tube body. This allows the medication flowing into the first part of the tube body to enter the casing through the inlet of the inlet connector, be filtered by the filter element inside the casing, and then flow into the second part of the tube body through the outlet of the outlet connector, ultimately flowing to the intravenous catheter connection end of the tube body. Both the inlet and outlet connectors of the casing are sealed to the tube body. During manufacturing, the casing and tube body can be molded together in one piece.

[0021] The housing contains a circular filter element. The outer periphery of the filter element can be bonded to the housing or fixed to the inner wall of the housing by an interference fit. The filter element can be a single filter screen (not shown in the figure), or two filter screens arranged in parallel within the housing, namely, a first filter screen 9 and a second filter screen 10 (see [reference]). Figure 2 When the filter screen is placed inside the housing, its surface is parallel to the central axis of the inlet connector. The extended lines of the central axis of the inlet connector and the central axis of the outlet connector coincide (when using a one-piece housing) or are parallel (when using a separate housing).

[0022] In addition, a baffle 11 is provided inside the housing. The baffle is parallel to the filter screen and located on the side of the housing near the liquid outlet, while the filter screen is located on the side of the housing near the liquid inlet. An overflow port is provided on the baffle for the filtered medicine to flow to the liquid outlet. The baffle can be a circular plate, and the overflow port can be a through hole on the baffle; alternatively, the baffle can be a large circular plate formed by milling off a small circular portion of the circular plate. When the baffle is installed inside the housing, the notch formed between the milled portion and the inner wall of the housing constitutes the overflow port. After the baffle is installed inside the housing, the overflow port is located on the side of the housing away from the liquid outlet. It should be noted that when the housing adopts a split structure consisting of two housings, the filter screen is placed in the first housing with the liquid inlet, and the baffle is placed in the second housing with the liquid outlet.

[0023] Furthermore, an exhaust port 7 can be provided on the shell. The exhaust port is located on the side of the shell near the liquid inlet connector, and a breathable membrane can also be provided at the exhaust port of the shell.

[0024] To facilitate the filtration of impurities and air in the medication solution, a filter screen with a pore size of 5 micrometers is used, allowing water molecules to pass through but not air. During the injection of medication into the intravenous extension tube via the three-way valve, the medication flows into the casing and is filtered out by the filter screen, removing any small amounts of air and fine impurities that may have been trapped during the injection process. Air escapes from the vent, while the filtered medication, free of impurities and air, flows towards the baffle. When the medication overflows the overflow port on the baffle, it flows out from the outlet connector. This ensures that the medication enters the vein already filtered and free of impurities and air, effectively preventing the dangers caused by impurities and air entering the vein, reducing patient discomfort, and minimizing the occurrence of medical disputes.

[0025] Although the present invention has been described in detail above, it is not limited thereto. Those skilled in the art can make modifications based on the principles of the present invention. Therefore, all modifications made in accordance with the principles of the present invention should be understood as falling within the protection scope of the present invention.

Claims

1. A filtering intravenous extension tube structure, comprising a tube body with a three-way connector at one end and an indwelling intravenous needle connector at the other, characterized in that, Also includes: A sealing assembly disposed in the pipe body and near the tee connection end; The sealing assembly includes: a housing whose inlet and outlet are respectively connected to corresponding portions of the tube located on both sides; a filter element disposed within the housing for filtering impurity particles and air in the liquid medicine flowing into the housing; and an exhaust port disposed on the housing for venting air from the liquid medicine flowing into the housing.

2. The filter-type venous extension tube structure according to claim 1, characterized in that, The filter element includes one filter screen or two filter screens arranged in parallel within the housing.

3. The filtering venous extension tube structure according to claim 1 or 2, characterized in that, A breathable membrane is also provided at the vent of the housing.

4. The filtering venous extension tube structure according to claim 3, characterized in that, The sealing assembly also includes a baffle disposed inside the housing and located on the side near the liquid outlet.

5. The filtering venous extension tube structure according to claim 4, characterized in that, The baffle is provided with an overflow port for the filtered medicine to flow to the outlet.

6. The filtering venous extension tube structure according to claim 2, characterized in that, The shell can be a one-piece structure or a split structure.

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