Transfusion catheter with hydrophilic coating

Abstract

The utility model belongs to the field of infusion catheters, and particularly relates to an infusion catheter with a hydrophilic coating, which comprises a catheter with the inner wall coated with the hydrophilic coating, and a drip chamber, a flow regulator, an exhaust pipe, a filter and an infusion needle are sequentially arranged on the catheter along the liquid transmission direction. When the hydrophilic coating of the inner cavity of the infusion catheter needs to be activated, normal saline can be injected through the opening of the exhaust pipe, the normal saline can be used for soaking when being attached to the hydrophilic coating on the inner wall of the catheter, the hydrophilic coating can rapidly absorb the normal saline and form a layer of water film on the surface, and the water film has a lubricating effect. In order to reduce the dosage of normal saline and accelerate the activation of the hydrophilic coating, the guide plug is driven by pulling the guide wire to slide along the inner cavity of the catheter in the direction opposite to the liquid medicine transmission direction, the normal saline can be uniformly distributed into the inner cavity of the catheter due to the fact that the guide wire is arranged on the side wall, attached to the catheter, of the guide plug, and the hydrophilic coating can be fully activated in the moving process.

Description

Technical Field

[0001] The utility model relates to the field of infusion catheters, and particularly to an infusion catheter with a hydrophilic coating. Background Art

[0002] An infusion catheter is a medical device used to deliver liquid drugs, nutrient solutions, blood, or other therapeutic liquids into a patient's body during medical procedures. Infusion catheters are usually made of soft plastic or rubber materials, with certain flexibility and durability, and can adapt to different body positions and blood vessel morphologies of patients;

[0003] The hydrophilic coating on the infusion catheter is a special functional coating that changes the properties of the catheter surface, making it highly hydrophilic. When the catheter comes into contact with a liquid, the hydrophilic coating can quickly absorb water and form a water film on the surface. This water film has a lubricating effect, reducing friction while increasing the flow rate of the drug solution transmission.

[0004] The activation of the hydrophilic coating is usually achieved by immersing the product in clean water. Just immerse the infusion catheter or other medical devices with a hydrophilic coating in clean water for about thirty seconds, and then take it out. In this way, the coating will be activated by water and form a colorless and transparent hydrogel. This hydrogel coating is highly lubricated and can withstand repeated friction. For the inner wall of the infusion catheter, its activation is achieved by soaking in the transmitted drug solution. On the one hand, there is a problem of drug solution waste, and on the other hand, there is a problem of low activation efficiency. Summary of the Utility Model

[0005] (I) Purpose of the Utility Model

[0006] To solve the technical problems existing in the background art, the utility model provides an infusion catheter with a hydrophilic coating, which has the characteristics of convenient activation of the hydrophilic coating and keeping the inner cavity of the infusion catheter dry.

[0007] (II) Technical Solution

[0008] To solve the above technical problems, the utility model provides an infusion catheter with a hydrophilic coating, including a catheter with a hydrophilic coating on its inner wall. A drip chamber, a flow regulator, an exhaust pipe, a filter, and an infusion needle are sequentially arranged on the catheter along the liquid transmission direction;

[0009] The exhaust pipe is of an inclined structure, and a detachable exhaust pipe plug is arranged at the open end;

[0010] The hydrophilic mechanism includes a guide wire that can move along the inner cavity of the catheter. The end of the guide wire is connected to a guide plug near the filter. A sealing pad attached to the inner cavity of the catheter is formed at the lower part of the guide plug, and a plurality of diversion grooves are formed on the side wall.

[0011] Preferably, the guide plug and the guide wire move synchronously along the inner cavity of the catheter.

[0012] Preferably, a gap is left between the catheter and the guide wire, and it is a bendable member.

[0013] Preferably, the guide plug has a "cone" structure, and a plurality of diversion grooves are equidistantly arranged on its side wall.

[0014] Preferably, a filter group is arranged in the inner cavity of the filter. The filter group includes a first filter element, a second filter element and a third filter element arranged along the liquid transmission direction, and the mesh numbers of the three increase layer by layer.

[0015] Preferably, a pipe plug for blocking the opening is installed on the catheter.

[0016] The above technical solution of the present utility model has the following beneficial technical effects: When it is necessary to activate the hydrophilic coating in the inner cavity of the infusion catheter, normal saline can be injected through the opening of the exhaust pipe. When the normal saline adheres to the hydrophilic coating on the inner wall of the catheter, it can act as an immersion. The hydrophilic coating can quickly absorb the normal saline and form a water film on the surface. This water film has a lubricating effect. To reduce the amount of normal saline used and accelerate the activation of the hydrophilic coating, the guide wire is pulled to drive the guide plug to slide along the inner cavity of the catheter in the direction opposite to the transmission of the liquid medicine. Because a plurality of diversion grooves are arranged on the side wall attached to the catheter, the normal saline can be evenly distributed into the inner cavity of the catheter, and the hydrophilic coating can be fully activated during the movement. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of the present utility model;

[0018] Figure 2 is a schematic cross-sectional structural diagram of the present utility model;

[0019] Figure 3 is a schematic structural diagram of the hydrophilic mechanism of the present utility model.

[0020] Reference numerals:

[0021] 1. Catheter; 11. Pipe plug; 2. Drip funnel; 3. Flow regulator; 4. Exhaust pipe; 41. Exhaust pipe plug; 5. Filter; 51. First filter element; 52. Second filter element; 53. Third filter element; 6. Infusion needle; 71. Guide wire; 72. Guide plug; 73. Diversion groove; 74. Sealing gasket. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] To make the objectives, technical solutions, and advantages of the present utility model clearer and more understandable, the present utility model will be further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are merely exemplary and are not intended to limit the scope of the present utility model. In addition, in the following description, the descriptions of well-known structures and technologies are omitted to avoid unnecessarily confusing the concepts of the present utility model.

[0023] As Figures 1-3 shown, a transfusion catheter with a hydrophilic coating proposed by the present utility model includes a catheter 1 with a hydrophilic coating on its inner wall. A tube plug 11 for blocking the opening is installed on the catheter 1 to block the guide wire 71.

[0024] A drip chamber 2, a flow regulator 3, an exhaust pipe 4, a filter 5, and an infusion needle 6 are sequentially arranged on the catheter 1 along the liquid transmission direction.

[0025] The exhaust pipe 4 is of an inclined structure, and a detachable exhaust pipe plug 41 is provided at the open end. Removing the exhaust pipe plug 41 exposes the opening of the exhaust pipe 4. Cooperating with an air extraction device can remove the residual air in the catheter 1 and prevent the air and the medicine solution from being mixed and injected into the patient's blood vessel.

[0026] The hydrophilic mechanism includes a guide wire 71 that can move along the inner cavity of the catheter 1. The end of the guide wire 71 is connected to a guide plug 72 near the filter 5. A sealing pad 74 attached to the inner cavity of the catheter 1 is formed at the lower part of the guide plug 72, and a plurality of diversion grooves 73 are provided on the side wall.

[0027] It should be noted that: a gap is left between the catheter 1 and the guide wire 71. Except for the guide plug 72 at the tail of the guide wire 71 which is in direct contact with the catheter 1, the rest of the parts are non-contact designs. Since it is a bendable component, by pulling the guide wire 71, the guide plug 72 connected to its tail can be driven to move synchronously along the inner cavity of the catheter 1. During the movement, the guide plug 72 is always in contact with the inner cavity of the catheter 1.

[0028] In this embodiment, when it is necessary to activate the hydrophilic coating on the inner cavity of the transfusion catheter 1, normal saline can be injected through the opening of the exhaust pipe 4. When the normal saline adheres to the hydrophilic coating on the inner wall of the catheter 1, it can act as an immersion. The hydrophilic coating can quickly absorb the normal saline and form a water film on the surface. This water film has a lubricating effect. To reduce the amount of normal saline used and accelerate the activation of the hydrophilic coating, by pulling the guide wire 71, the guide plug 72 is driven to slide along the inner cavity of the catheter 1 in the direction opposite to the medicine solution transmission. Since a plurality of diversion grooves 73 are provided on the side wall in contact with the catheter 1, the normal saline can be evenly distributed to the inner cavity of the catheter 1, and the hydrophilic coating can be fully activated during the movement.

[0029] It should be added that the guide plug 72 has a "cone" structure, and a number of diversion grooves 73 are equidistantly arranged on its side wall; the "cone" structure and the diversion grooves 73 formed on its surface can push the physiological saline and make full contact with the inner wall of the catheter 1.

[0030] In order to filter impurities in the transmitted liquid medicine, further, a filter group is arranged in the inner cavity of the filter 5. The filter group includes a first filter element 51, a second filter element 52 and a third filter element 53 arranged along the liquid transmission direction. The mesh numbers of the three increase layer by layer, and the liquid medicine passes through the first filter element 51, the second filter element 52 and the third filter element 53 in sequence for hierarchical filtration of the liquid medicine to prevent large particle impurities from being injected into the patient's blood vessel.

[0031] It should be understood that the above specific embodiments of the present invention are only used for exemplary illustration or explanation of the principle of the present invention, and do not constitute a limitation to the present invention. Therefore, any modifications, equivalent replacements, improvements, etc. made without departing from the spirit and scope of the present invention shall be included within the protection scope of the present invention. In addition, the appended claims of the present invention are intended to cover all changes and modification examples falling within the scope and boundary of the appended claims, or equivalent forms of such scope and boundary.

Claims

1. An infusion catheter with a hydrophilic coating, characterized in that: The invention comprises a catheter (1) whose inner wall is coated with a hydrophilic coating, wherein a drip bucket (2), a flow regulator (3), an exhaust pipe (4), a filter (5) and an infusion needle (6) are sequentially arranged on the catheter (1) along the liquid transmission direction; The exhaust pipe (4) is of an inclined structure, and a detachable exhaust pipe plug (41) is provided at the open end; The hydrophilic mechanism comprises a guide wire (71) movable along the inner cavity of the catheter (1), the end of the guide wire (71) is connected to a guide plug (72) close to the filter (5), the lower part of the guide plug (72) is formed with a sealing gasket (74) attached to the inner cavity of the catheter (1), and a side wall is provided with a plurality of guide grooves (73).

2. The infusion catheter with a hydrophilic coating according to claim 1, characterized in that: The guide plug (72) and the guide wire (71) move synchronously along the inner cavity of the catheter (1).

3. The infusion catheter with a hydrophilic coating according to claim 1, characterized in that: A gap is left between the catheter (1) and the guide wire (71), and the catheter is a bendable component.

4. The infusion catheter with a hydrophilic coating according to claim 1, characterized in that: The guide plug (72) is a "conical" structure, and a plurality of guide grooves (73) are arranged at equal intervals on its side wall.

5. The infusion catheter with a hydrophilic coating according to claim 1, characterized in that: The inner cavity of the filter (5) is provided with a filter group, which comprises a first filter element (51), a second filter element (52) and a third filter element (53) arranged along the liquid transmission direction, and the mesh numbers of the three filter elements increase layer by layer.

6. The infusion catheter with a hydrophilic coating according to claim 1, characterized in that: The conduit (1) is provided with a pipe plug (11) for sealing the opening.

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