Guiding catheter with inner cavity coated with hydrophilic coating

Abstract

The utility model discloses a guide catheter with an inner cavity coated with a hydrophilic coating, which comprises a catheter body, a reinforcing tube and a catheter seat, the reinforcing tube is sleeved on the catheter body, one end of the reinforcing tube and one end of the catheter body both extend into the catheter seat, one end of the catheter body extending into the catheter seat is a flaring end, and the other end of the catheter body extends into the catheter seat. The flaring end is in a circular truncated cone shape, and the pipe body comprises an outer layer, a middle layer, an inner layer and a hydrophilic coating which are sequentially arranged from outside to inside. The utility model belongs to a hydrophilic coating guide catheter, which is characterized in that the surface of the inner cavity of the catheter body is coated with a hydrophilic coating, the hydrophilic coating of the inner cavity of the catheter body can be activated by filling normal saline / heparinized normal saline, and the activated hydrophilic coating of the inner cavity of the catheter body can reduce the friction coefficient between an instrument and the inner cavity of the guide catheter, so that the friction force is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, in particular to a guiding catheter with a hydrophilic coating applied to its inner cavity. Background Art

[0002] In the clinical application process of traditional guiding catheters, there are problems of difficult pushing and easy damage to the inner wall of blood vessels.

[0003] For example, when pushing a guiding catheter to a specified position in a patient's body, due to the tortuous blood vessel path or complex physiological structure involved in some surgical procedures, simply using a guide wire for assistance cannot guide the guiding catheter to the proper position. Generally, a contrast catheter, a support catheter, etc. with a suitable configuration (such as BER, SIM, etc.) will be inserted into the human body through the inner cavity of the guiding catheter to guide the guiding catheter to the proper position. However, the outer diameter of such contrast catheters and support catheters is similar to the inner diameter of the guiding catheter, and coupled with the mostly curved shape of blood vessels, the frictional force between them and the inner cavity of the guiding catheter increases during the pushing process in the inner cavity of the guiding catheter, resulting in difficult pushing. In severe cases, the catheter may even be bent or broken in the patient's body, affecting the progress of the surgery and causing harm to the patient.

[0004] Again, in some surgical procedures, a relatively large number of instruments are used. For example, when dealing with a CTO lesion at the bifurcation of a Y-shaped blood vessel, two balloon dilation catheters, two guide wires and other instruments will be used. These instruments will exist in the inner cavity of the guiding catheter at the same time, squeezing the inner cavity of the guiding catheter, increasing the frictional force between them and the inner cavity of the guiding catheter, resulting in difficult pushing. In severe cases, the catheter may even be bent or broken in the patient's body, affecting the progress of the surgery and causing harm to the patient.

[0005] Again, since the tube body structure of the guiding catheter is generally a multi-layer structure of an inner layer (polymer material) - an intermediate layer (braided silk or wound silk) - an outer layer (polymer material), when the tube body is bent, due to the different properties of the polymer materials of the inner and outer layers and the metal material of the intermediate layer, especially the elongation rate, etc., the bending deformation amounts of the inner and outer layers and the intermediate layer are different. When the tube body is bent, the inner layer will become uneven on the surface due to the protrusion of the intermediate layer, and these unevennesses will increase the frictional force, affecting the passing performance of the instrument in the inner cavity of the guiding catheter, resulting in difficult pushing. In severe cases, the catheter may even be bent or broken in the patient's body, affecting the progress of the surgery and causing harm to the patient. Summary of the Utility Model

[0006] Therefore, an object of the present utility model is to provide a guiding catheter with a hydrophilic coating applied to its inner cavity to solve the problems mentioned in the background art and overcome the deficiencies in the prior art.

[0007] To achieve the above object, the present utility model adopts the following technical solutions:

[0008] A guiding catheter with a hydrophilic coating on its inner cavity, comprising a catheter body, a reinforcing tube and a catheter hub. The reinforcing tube is sleeved on the catheter body. One end of the reinforcing tube and one end of the catheter body both extend into the interior of the catheter hub. The end of the catheter body extending into the interior of the catheter hub is a flared end, and the flared end is frustum-shaped. The catheter body includes an outer layer, a middle layer, an inner layer and a hydrophilic coating arranged in sequence from outside to inside.

[0009] Further, both the catheter body and the reinforcing tube are hollow circular tubes.

[0010] Further, the catheter hub is provided with a first cavity, a second cavity and a third cavity connected in sequence. There is a step between the first cavity and the second cavity. The shape of the end of the second cavity away from the first cavity corresponds to the flared end of the catheter body, and the flared end of the catheter body can just be embedded into the end of the second cavity away from the first cavity.

[0011] Further, the third cavity includes a front section, a middle section and a rear section connected in sequence. The front section is connected to the second cavity, and the cross-sectional diameters of the middle section and the rear section gradually increase in the direction away from the front section.

[0012] Further, the length of the reinforcing tube is less than the length of the catheter body.

[0013] Further, the outer surface of the catheter hub is provided with reinforcing ribs, and the end of the catheter hub away from the catheter body is provided with an external thread.

[0014] Further, the materials of the catheter hub and the reinforcing tube are high molecular materials.

[0015] Further, the reinforcing tube and the catheter body are fixedly connected by bonding or welding, and the reinforcing tube and the catheter hub are fixedly connected by bonding or welding.

[0016] Therefore, the present utility model has the following beneficial effects:

[0017] For the guiding catheter assembly with a hydrophilic coating of the present utility model, by coating a hydrophilic coating on the inner cavity of the catheter tube body, the friction between a contrast catheter, a support catheter, etc. and the inner cavity of the guiding catheter can be reduced, so that the guiding catheter can smoothly reach the designated position in the patient's body, and the risk of tube body bending caused by friction can be reduced.

[0018] For the guiding catheter assembly with a hydrophilic coating of the present utility model, by coating a hydrophilic coating on the inner cavity of the catheter tube body, the friction between the instruments and the inner cavity of the guiding catheter caused by the presence of more instruments in the inner cavity of the guiding catheter at the same time can be reduced, so that the instruments can smoothly pass through the guiding catheter and enter the patient's body for surgery, and the risk of instrument damage caused by friction can be reduced.

[0019] The guiding catheter assembly with a hydrophilic coating of the present utility model coats a hydrophilic coating on the inner cavity of the catheter tube body, which can reduce the friction caused by the uneven surface of the inner layer due to the protrusion of the middle layer, enabling the instrument to smoothly pass through the guiding catheter and enter the patient's body for surgery, and reducing the risks such as instrument damage caused by friction.

[0020] Additional aspects and advantages of the present utility model will be given in part in the following description, become apparent in part from the following description, or be understood through the practice of the present utility model. Brief Description of the Drawings

[0021] The above and / or additional aspects and advantages of the present utility model will become apparent and be easily understood from the description of the embodiments in conjunction with the following drawings, where:

[0022] Figure 1 is the overall structural schematic diagram of the guiding catheter assembly of the present utility model;

[0023] Figure 2 is the front view of the guiding catheter assembly of the present utility model;

[0024] Figure 3 is Figure 2 the cross-sectional view taken along A-A shown;

[0025] Figure 4 is the structural schematic diagram of the catheter of the present utility model;

[0026] Figure 5 is the structural schematic diagram of the tube seat of the present utility model;

[0027] Figure 6 is the front view of the tube seat of the present utility model;

[0028] Figure 7 is Figure 6 the cross-sectional view taken along B-B shown;

[0029] Figure 8 is the structural schematic diagram of each layer of the catheter after the catheter of the present utility model is coated with a hydrophilic coating.

[0030] In the figures: 1. Tube body; 101. Outer layer; 102. Middle layer; 103. Inner layer; 104. Hydrophilic coating; 2. Reinforcing tube; 3. Tube seat; 4. Flared end; 5. First cavity; 6. Second cavity; 7. Third cavity; 701. Front section; 702. Middle section; 703. Rear section; 8. Step; 9. Reinforcing rib; 10. External thread. Detailed Embodiments

[0031] Embodiments of the present utility model will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are intended to explain the present utility model and should not be construed as limiting the present utility model.

[0032] In the present utility model, unless otherwise clearly specified and defined, terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0033] A guiding catheter with a hydrophilic coating on the inner cavity includes a catheter body 1, a reinforcing tube 2, and a tube seat 3. The reinforcing tube 2 is sleeved on the catheter body 1. One end of the reinforcing tube 2 and one end of the catheter body 1 both extend into the interior of the tube seat 3. The end of the catheter body 1 extending into the interior of the tube seat 3 is a flared end 4, and the flared end 4 is frustum-shaped. The catheter body 1 includes an outer layer 101, a middle layer 102, an inner layer 103, and a hydrophilic coating 104 arranged in sequence from outside to inside.

[0034] As Figure 8 shown, the catheter body 1 of the present utility model includes an outer layer 101, a middle layer 102, an inner layer 103, and a hydrophilic coating 104. The hydrophilic coating 104 is coated on the inner surface of the catheter body 1. The hydrophilic coating 104 in the inner cavity of the catheter body 1 can be activated by perfusing normal saline / heparinized normal saline. The activated hydrophilic coating 104 in the inner cavity of the catheter body 1 can reduce the friction coefficient between the instrument and the inner cavity of the guiding catheter, thereby reducing the frictional force.

[0035] As an implementation manner, the hydrophilic coating 104 can be formed by a hydrophilic coating composition; the hydrophilic coating composition can include a water-soluble polymer, a water-insoluble polymer, and water; the hydrophilic coating composition can include polyvinylpyrrolidone and polyurethane; or, the hydrophilic coating composition can include polyethylene oxide.

[0036] As an implementation manner, the hydrophilic coating 104 can be a hydrogel coating; the coating can form a highly lubricating hydrogel film after contacting water, thereby reducing the frictional resistance during intubation.

[0037] The utility model discloses a guide tube body with an inner cavity coated with a hydrophilic coating. A hydrophilic coating 104 is coated on the inner cavity of the catheter tube body 1. After the hydrophilic coating 104 is activated by using saline / heparinized saline, the friction between the angiographic catheter, the support catheter, etc. and the inner cavity of the guide catheter can be reduced, so that the guide catheter can smoothly reach the designated position in the patient's body and reduce the risk of bending of the tube body 1 due to friction.

[0038] The utility model discloses a guide tube body with an inner cavity coated with a hydrophilic coating. A hydrophilic coating 104 is coated on the inner cavity of the catheter tube body 1. After the hydrophilic coating 104 is activated by using saline / heparinized saline, the friction between the instrument and the inner cavity of the guide catheter caused by the simultaneous presence of a large number of instruments in the inner cavity of the guide catheter can be reduced, so that the instrument can smoothly pass through the guide catheter into the patient's body for surgery, reducing the risk of instrument damage due to friction.

[0039] The utility model discloses a guide tube body with an inner cavity coated with a hydrophilic coating. A hydrophilic coating 104 is coated on the inner cavity of the catheter tube body 1. After the hydrophilic coating 104 is activated by using saline / heparinized saline, the friction caused by the inner layer 103 becoming uneven on the surface due to the protrusion of the middle layer can be reduced, so that the instrument can smoothly pass through the guide catheter into the patient's body for surgery, reducing the risk of instrument damage due to friction.

[0040] Further, such as Figure 1 and Figure 4 As shown, the tube body 1 and the reinforcement tube 2 are both hollow circular tubes.

[0041] Furthermore, another layer of hydrophilic coating is provided on the outer surface of the catheter body 1. After the hydrophilic coating is applied to the outer surface of the catheter body 1 and activated by saline / heparinized saline, the friction between the outer surface of the guide catheter and the inner wall of the blood vessel can be effectively reduced, thereby avoiding damage to the inner wall of the blood vessel.

[0042] Furthermore, a first cavity 5, a second cavity 6 and a third cavity 7 which are connected in sequence are provided in the tube seat 3, a step 8 is provided between the first cavity 5 and the first cavity 5, and the shape of the end of the second cavity 6 away from the first cavity 5 corresponds to the flared end 4 of the tube body 1, and the flared end 4 of the tube body 1 can just be embedded in the end of the second cavity 6 away from the first cavity 5.

[0043] As an implementation method, Figure 4 As shown, one end of the catheter body 1 extending into the interior of the tube seat 3 is a flared end 4, and the flared end 4 is in a truncated cone shape.

[0044] Furthermore, the hardness of the expanded end 4 of the catheter is greater than the hardness of other parts of the catheter.

[0045] If the connection between the socket 3 and the catheter pipeline is only through simple bonding, it is likely to cause the risk that the connection between the socket 3 and the pipeline is not resistant to high pressure and is prone to falling off / separating. Therefore, in the present utility model, the end of the catheter body 1 extending into the interior of the socket 3 is flared and is matched with the second cavity 6 in the socket 3, so that the flared end 4 of the catheter body 1 extending into the interior of the socket 3 is embedded in the corresponding position of the second cavity 6 in the socket 3, making the connection between the socket 3 and the catheter pipeline more firm and meeting the requirement of being resistant to high pressure.

[0046] One end of the reinforcing tube 2 extending into the socket 3 contacts the step 8 between the first cavity 5 and the first cavity 5, and the step 8 between the first cavity 5 and the first cavity 5 is used for limiting the interior of the reinforcing tube 2.

[0047] Further, as Figure 7 shown, the third cavity 7 includes a front section 701, an intermediate section 702 and a rear section 703 connected in sequence. The front section 701 is connected to the second cavity 6, and the cross-sectional diameters of the intermediate section 702 and the rear section 703 gradually increase in the direction away from the front section 701.

[0048] The cross-sectional diameter of the front section 701 of the third cavity 7 is the same as that of the second cavity 6, and the cross-sectional diameters of the intermediate section 702 and the rear section 703 of the third cavity 7 gradually increase. The difference is that the rate of increase in the cross-sectional diameter of the intermediate section 702 is greater than the rate of increase in the cross-sectional diameter of the rear section 703. The cross-sectional diameters of the intermediate section 702 and the rear section 703 gradually increase in the direction away from the front section 701, which is beneficial to the flow of liquid.

[0049] As Figure 1 、 Figure 2 and Figure 3 shown, further, the length of the reinforcing tube 2 is less than the length of the tube body 1.

[0050] As Figure 5 shown, further, the outer surface of the socket 3 is provided with a reinforcing rib 9, and the end of the socket 3 away from the tube body 1 is provided with an external thread 10. The reinforcing rib 9 can increase the friction between the hand and the socket 3, which is helpful for the clinical use of medical staff, and the external thread 10 is used to cooperate with a Luer connector to connect other devices or instruments.

[0051] Further, the materials of the socket 3 and the reinforcing tube 2 are high molecular materials.

[0052] Further, the reinforcing tube 2 and the tube body 1 are fixedly connected by bonding or welding, and the reinforcing tube 2 and the socket 3 are fixedly connected by bonding or welding.

[0053] As an implementation manner, the reinforcing tube 2 and the catheter are fixedly connected by bonding.

[0054] As an implementation manner, the reinforcing tube 2 and the catheter are fixedly connected by welding.

[0055] As an implementation manner, the reinforcing tube 2 and the socket 3 are fixedly connected by bonding.

[0056] As an implementation manner, the reinforcing tube 2 and the socket 3 are fixedly connected by welding.

[0057] As an implementation manner, the thickness of the hydrophilic coating 104 is less than the thicknesses of the outer layer 101, the middle layer 102, and the inner layer 103.

[0058] As an implementation manner, the thickness of the hydrophilic coating 104 is less than the thicknesses of the outer layer 101, the middle layer 102, and the inner layer 103.

[0059] The utility model belongs to a hydrophilic-coated guiding catheter. The inner cavity surface of the tube body 1 is coated with a hydrophilic coating 104. The hydrophilic coating 104 in the inner cavity of the tube body 1 can be activated by perfusing normal saline / heparinized normal saline. The activated hydrophilic coating 104 in the inner cavity of the tube body 1 can reduce the friction coefficient between the instrument and the inner cavity of the guiding catheter, thereby reducing the frictional force.

[0060] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0061] Those skilled in the art can easily understand that the utility model includes any combination of the above-mentioned utility model content and specific implementation parts in the specification and each part shown in the drawings. Due to space limitations and to make the specification concise, the various solutions formed by these combinations are not described one by one. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included within the protection scope of the utility model.

[0062] Although the embodiments of the utility model have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the utility model. Those of ordinary skill in the art can make changes, modifications, replacements, and variations to the above embodiments within the scope of the utility model without departing from the principle and purpose of the utility model. The scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A guide catheter with a hydrophilic coating on the inner lumen, characterized in that: It includes a tube body, a reinforcement tube and a tube seat, the reinforcement tube is sleeved on the tube body, one end of the reinforcement tube and one end of the tube body both extend into the interior of the tube seat, the end of the tube body extending into the interior of the tube seat is a flared end, and the flared end is truncated cone-shaped, and the tube body includes an outer layer, a middle layer, an inner layer and a hydrophilic coating arranged in sequence from the outside to the inside.

2. A guide catheter with a hydrophilic coating on the inner lumen according to claim 1, characterized in that: The tube body and the reinforcement tube are both hollow circular tubes.

3. A guide catheter with a hydrophilic coating on the inner lumen according to claim 2, characterized in that: The tube seat is provided with a first cavity, a second cavity and a third cavity which are connected in sequence, a step is provided between the first cavity and the second cavity, the shape of the end of the second cavity away from the first cavity corresponds to the flared end of the tube body, and the flared end of the tube body can just be embedded in the end of the second cavity away from the first cavity.

4. A guide catheter with a hydrophilic coating on the inner lumen according to claim 3, characterized in that: The third cavity includes a front section, a middle section and a rear section which are connected in sequence, the front section is connected to the second cavity, and the cross-sectional diameters of the middle section and the rear section gradually increase in a direction away from the front section.

5. The guide catheter with a hydrophilic coating on the inner lumen according to claim 1, characterized in that: The length of the reinforcement tube is shorter than the length of the tube body.

6. A guide catheter with a hydrophilic coating on the inner lumen according to claim 5, characterized in that: The outer surface of the tube seat is provided with reinforcing ribs, and one end of the tube seat away from the tube body is provided with external threads.

7. The guide catheter with a hydrophilic coating on the inner lumen according to claim 1, characterized in that: The tube seat and the reinforcing tube are made of polymer materials.

8. A guide catheter with an inner lumen coated with a hydrophilic coating according to any one of claims 1 to 7, characterized in that: The reinforcing tube is fixedly connected to the tube body by bonding or welding, and the reinforcing tube is fixedly connected to the tube seat by bonding or welding.

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