Guide catheter assembly with hydrophilic coating

Abstract

The guide catheter assembly comprises a catheter, a reinforcing tube and a catheter base, the reinforcing tube is arranged on the catheter in a sleeved mode, one end of the reinforcing tube and one end of the catheter both extend into the catheter base, the catheter comprises an outer layer, a middle layer, an inner layer and the hydrophilic coating, the middle layer is arranged on the outer layer, the inner layer is arranged on the middle layer, and the hydrophilic coating is arranged on the inner layer. The hydrophilic coating comprises a first hydrophilic coating and a second hydrophilic coating, and the outer layer, the middle layer and the inner layer are sandwiched between the first hydrophilic coating and the second hydrophilic coating. The surface and the outer surface of the inner cavity of the catheter body are coated with the hydrophilic coatings, and the hydrophilic coatings activated in 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; the hydrophilic coating activated on the outer surface of the catheter body can reduce the friction coefficient between the outer surface of the guiding catheter and inner cavities of instruments such as blood vessels, guiding sheaths or vascular sheaths, and therefore 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 assembly with a hydrophilic coating. Background Art

[0002] During the clinical application 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 into place. Generally, a contrast catheter, a support catheter, etc. with a suitable configuration (such as BER, SIM, etc.) will enter the human body through the inner cavity of the guiding catheter to guide the guiding catheter into place. 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 blood vessel morphology, the friction 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. Seriously, the catheter may even be folded or broken in the patient's body, affecting the progress of the operation and causing harm to the patient.

[0004] Another example is that some surgical procedures use more instruments. For example, when dealing with CTO lesions at the bifurcation of Y-shaped blood vessels, 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 friction between them and the inner cavity of the guiding catheter, resulting in difficult pushing. Seriously, the catheter may even be folded or broken in the patient's body, affecting the progress of the operation and causing harm to the patient.

[0005] Another example is that 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 layer and the outer layer from the metal material of the intermediate layer, especially the elongation rate, etc., the bending deformation amounts of the inner layer, the outer layer 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. These unevennesses will increase the friction, affect the passing performance of the instrument in the inner cavity of the guiding catheter, result in difficult pushing. Seriously, the catheter may even be folded or broken in the patient's body, affecting the progress of the operation and causing harm to the patient.

[0006] Another example is that due to stenosis caused by lesions or congenital stenosis in some blood vessels of some patients, when the guiding catheter passes through such blood vessels, the friction will be large due to the small inner diameter of the blood vessels, thus damaging the inner wall of the blood vessels.

[0007] For another example, after the guiding catheter reaches the designated position in the patient's blood vessel, corresponding instruments will be delivered from the inside of the guiding catheter according to different surgical procedures. When some instruments pass through the guiding catheter, due to their high bending strength, they will push against the inner wall of the guiding catheter, causing the outer surface of the guiding catheter to rub against the inner wall of the blood vessel, thereby damaging the inner wall of the blood vessel. Summary of the Invention

[0008] To this end, an object of the present invention is to provide a guiding catheter assembly with a hydrophilic coating to solve the problems mentioned in the background art and overcome the deficiencies in the prior art.

[0009] To achieve the above object, the present invention adopts the following technical solutions:

[0010] A guiding catheter assembly with a hydrophilic coating includes a catheter, a reinforcing tube, and a hub. The reinforcing tube is sleeved on the catheter. One end of the reinforcing tube and one end of the catheter both extend into the inside of the hub. The catheter includes an outer layer, a middle layer, an inner layer, and a hydrophilic coating. The hydrophilic coating includes a first hydrophilic coating and a second hydrophilic coating. The first hydrophilic coating and the second hydrophilic coating sandwich the outer layer, the middle layer, and the inner layer in the middle.

[0011] Further, both the catheter and the reinforcing tube are hollow circular tubes.

[0012] Further, the hub is provided with a first cavity, a second cavity, and a third cavity that are connected in sequence. There is a step between the first cavity and the first cavity. The shape of the end of the second cavity away from the first cavity corresponds to the flared end of the catheter. The flared end of the catheter can just be embedded into the end of the second cavity away from the first cavity.

[0013] Further, the third cavity includes a front section, a middle section, and a rear section that are connected in sequence. The front section is connected to the second cavity. The cross-sectional diameters of the middle section and the rear section gradually increase in the direction away from the front section.

[0014] Further, the length of the reinforcing tube is less than the length of the catheter.

[0015] Further, the outer surface of the hub is provided with reinforcing ribs, and the end of the hub away from the catheter is provided with an external thread.

[0016] Further, the materials of the hub and the reinforcing tube are polymer materials.

[0017] Further, the reinforcing tube and the catheter are fixedly connected by bonding or welding, and the reinforcing tube and the hub are fixedly connected by bonding or welding.

[0018] Therefore, the utility model has the following beneficial effects:

[0019] For the guiding catheter assembly with a hydrophilic coating of the present utility model, by applying a hydrophilic coating to the inner cavity of the catheter tube, the friction between the contrast catheter, the support catheter, etc. and the inner cavity of the guiding catheter can be reduced, enabling the guiding catheter to smoothly reach the designated position in the patient's body and reducing risks such as tube body bending caused by friction.

[0020] For the guiding catheter assembly with a hydrophilic coating of the present utility model, by applying a hydrophilic coating to the inner cavity of the catheter tube, the friction between the instruments and the inner cavity of the guiding catheter caused by the presence of multiple instruments in the inner cavity of the guiding catheter can be reduced, enabling the instruments to smoothly pass through the guiding catheter and enter the patient's body for surgery, and reducing risks such as instrument damage caused by friction.

[0021] For the guiding catheter assembly with a hydrophilic coating of the present utility model, by applying a hydrophilic coating to the inner cavity of the catheter tube, the friction caused by the uneven surface of the inner layer due to the protrusion of the middle layer can be reduced, enabling the instruments to smoothly pass through the guiding catheter and enter the patient's body for surgery, and reducing risks such as instrument damage caused by friction.

[0022] For the guiding catheter assembly with a hydrophilic coating of the present utility model, by applying a hydrophilic coating to the outer surface of the catheter tube, the friction between the outer surface of the guiding catheter and the inner wall of the blood vessel can be effectively reduced, thereby avoiding damage to the inner wall of the blood vessel.

[0023] The additional aspects and advantages of the present utility model will be partially given in the following description, partially will become obvious from the following description, or will be understood through the practice of the present utility model. Description of the Drawings

[0024] The above and / or additional aspects and advantages of the present utility model will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, where:

[0025] Figure 1 is the overall structural schematic diagram of the guiding catheter assembly of the present utility model;

[0026] Figure 2 is the front view of the guiding catheter assembly of the present utility model;

[0027] Figure 3 is Figure 2 the A-A cross-sectional view shown;

[0028] Figure 4 is the structural schematic diagram of the catheter of the present utility model;

[0029] Figure 5 is the structural schematic diagram of the tube seat of the present utility model;

[0030] Figure 6It is the front view of the socket of the present utility model;

[0031] Figure 7 is Figure 6 the B-B cross-sectional view shown;

[0032] Figure 8 It is the schematic diagram of the structures of each layer of the catheter after the catheter of the present utility model is coated with a hydrophilic coating.

[0033] In the figure: 1. Catheter; 101. First hydrophilic coating; 102. Outer layer; 103. Middle layer; 104. Inner layer; 105. Second hydrophilic coating; 2. Reinforcing tube; 3. Socket; 4. Flared end; 5. First cavity; 6. Second cavity; 7. Third cavity; 701. Front section; 702. Intermediate section; 703. Rear section; 8. Step; 9. Reinforcing rib; 10. External thread. Specific embodiments

[0034] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings, wherein 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 with reference to the drawings are exemplary and are intended to explain the present utility model, and should not be construed as limiting the present utility model.

[0035] In the present utility model, unless otherwise clearly defined and limited, the terms "installation", "connection", "connection", "fixation" and other terms 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 situations.

[0036] As Figures 1 - 8 shown, a guiding catheter assembly with a hydrophilic coating includes a catheter 1, a reinforcing tube 2 and a socket 3. The reinforcing tube 2 is sleeved on the catheter 1. One end of the reinforcing tube 2 and one end of the catheter 1 both extend into the interior of the socket 3. The catheter 1 includes an outer layer 102, a middle layer 103, an inner layer 104 and a hydrophilic coating. The hydrophilic coating includes a first hydrophilic coating 101 and a second hydrophilic coating 105. The first hydrophilic coating 101 and the second hydrophilic coating 105 sandwich the outer layer 102, the middle layer 103 and the inner layer 104 in the middle.

[0037] As Figure 8As shown, the catheter 1 of the utility model includes an outer layer 102, a middle layer 103, an inner layer 104 and a hydrophilic coating. The hydrophilic coating includes a first hydrophilic coating 101 and a second hydrophilic coating 105. The first hydrophilic coating 101 and the second hydrophilic coating 105 have water affinity properties. The first hydrophilic coating 101 and the second hydrophilic coating 105 are respectively coated on the inner and outer surfaces of the catheter 1 body.

[0038] The second hydrophilic coating 105 in the lumen of the catheter body can be activated by perfusing physiological saline / heparinized physiological saline. The activated hydrophilic coating in the lumen of the catheter body can reduce the friction coefficient between the instrument and the inner lumen of the guide catheter 1, thereby reducing the friction force.

[0039] The first hydrophilic coating 101 on the outer surface of the catheter can be activated by soaking in saline / heparinized saline. The activated hydrophilic coating on the outer surface of the catheter can reduce the friction coefficient between the outer surface of the guide catheter 1 and the inner cavity of the blood vessel, guide sheath or vascular sheath, thereby reducing friction.

[0040] As an embodiment, the hydrophilic coating 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 polyvinyl pyrrolidone and polyurethane; or, the hydrophilic coating composition can include polyethylene oxide.

[0041] As an embodiment, the hydrophilic coating may be a hydrogel coating; the coating may form a highly lubricating hydrogel film upon contact with water, thereby reducing frictional resistance during intubation.

[0042] The guide catheter assembly with a hydrophilic coating of the utility model has a hydrophilic coating applied to the inner cavity of the catheter tube. After the hydrophilic coating is activated by using normal saline / heparinized normal 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 tube bending due to friction.

[0043] The guide catheter assembly with a hydrophilic coating of the utility model has a hydrophilic coating applied to the inner cavity of the catheter tube. After the hydrophilic coating is activated by using normal saline / heparinized normal 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.

[0044] 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. After activating the hydrophilic coating with normal saline / heparinized normal saline, it 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 into the patient's body for surgery and reducing the risk of instrument damage caused by friction.

[0045] The guiding catheter assembly with a hydrophilic coating of the present utility model coats a hydrophilic coating on the outer surface of the catheter tube body. After activating the hydrophilic coating with normal saline / heparinized normal saline, it can effectively reduce the friction between the outer surface of the guiding catheter and the inner wall of the blood vessel, thereby avoiding damage to the inner wall of the blood vessel.

[0046] As Figure 1 and Figure 4 shown, both the catheter 1 and the reinforcing tube 2 are hollow circular tubes.

[0047] Further, as Figure 4 shown, one end of the catheter 1 extending into the inside of the socket 3 is a flared end 4, and the flared end 4 is frustum-shaped.

[0048] If the connection method between the socket 3 and the catheter 1 is only through simple bonding, it is likely to cause the risk of being unable to withstand high pressure and being easily detached / separated at the connection between the socket 3 and the pipeline. Therefore, the present utility model flares one end of the catheter 1 extending into the inside of the socket 3 and mates it with the second cavity 6 in the socket 3, so that the flared end 4 of the catheter 1 extending into the inside of the socket 3 is embedded in the corresponding position of the second cavity 6 in the socket 3, making the pipeline connection between the socket 3 and the catheter 1 more secure and meeting the requirement of withstanding high pressure.

[0049] Further, the hardness of the flared end 4 of the catheter 1 is greater than that of other parts of the catheter 1.

[0050] Further, as Figure 7 shown, the socket 3 is provided with a first cavity 5, a second cavity 6, and a third cavity 7 connected in sequence. There is a step 8 between the first cavity 5 and the first cavity 5. The shape of the end of the second cavity 6 away from the first cavity 5 corresponds to the flared end 4 of the catheter 1, and the flared end 4 of the catheter 1 can just be embedded in the end of the second cavity 6 away from the first cavity 5.

[0051] 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 to limit the inside of the reinforcing tube 2.

[0052] Further, as Figure 7As shown, the third cavity 7 includes a front section 701, a middle section 702, and a rear section 703 that are connected in sequence. The front section 701 is connected to the second cavity 6, and the cross-sectional diameters of the middle section 702 and the rear section 703 gradually increase in a direction away from the front section 701.

[0053] 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 middle 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 middle 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 middle section 702 and the rear section 703 gradually increase in a direction away from the front section 701, which is beneficial to the flow of liquid.

[0054] As Figure 1 、 Figure 2 and Figure 3 shown, further, the length of the reinforcing tube 2 is less than the length of the catheter 1.

[0055] As Figure 5 shown, further, the outer surface of the tube socket 3 is provided with a reinforcing rib 9, and an external thread 10 is provided at one end of the tube socket 3 away from the catheter 1. The reinforcing rib 9 can increase the friction between the hand and the tube socket 3, which is helpful for the clinical use of medical staff. The external thread 10 is used to cooperate with a Luer connector to connect other devices or instruments.

[0056] Further, the tube socket 3 and the reinforcing tube 2 are made of a polymer material.

[0057] As an implementation manner, the reinforcing tube 2 and the catheter 1 are fixedly connected by bonding.

[0058] As an implementation manner, the reinforcing tube 2 and the catheter 1 are fixedly connected by welding.

[0059] As an implementation manner, the reinforcing tube 2 and the tube socket 3 are fixedly connected by bonding.

[0060] As an implementation manner, the reinforcing tube 2 and the tube socket 3 are fixedly connected by welding.

[0061] As an implementation manner, the thicknesses of the first hydrophilic coating 101 and the second hydrophilic coating 105 are equal.

[0062] As an implementation manner, the thicknesses of the first hydrophilic coating 101 and the second hydrophilic coating 105 are less than the thicknesses of the outer layer 102, the middle layer 103, and the inner layer 104.

[0063] The utility model belongs to a hydrophilic-coated guiding catheter. The inner cavity surface of the catheter is coated with a hydrophilic coating, and the outer surface of the catheter is also coated with a hydrophilic coating. The hydrophilic coating in the inner cavity of the catheter can be activated by perfusing normal saline / heparinized normal saline, and the hydrophilic coating on the outer surface of the catheter can be activated by soaking in normal saline / heparinized normal saline. The activated hydrophilic coating in the inner cavity of the catheter can reduce the friction coefficient between the instrument and the inner cavity of the guiding catheter 1, thereby reducing the frictional force. The activated hydrophilic coating on the outer surface of the catheter can reduce the friction coefficient between the outer surface of the guiding catheter 1 and the inner cavities of instruments such as blood vessels, guiding sheaths or vascular sheaths, thereby reducing the frictional force.

[0064] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean 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.

[0065] It is not difficult for those skilled in the art to understand that the utility model includes any combination of the above-mentioned utility model content and the specific implementation part of 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.

[0066] 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. Without departing from the principle and purpose of 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. The scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A guide catheter assembly having a hydrophilic coating, characterized in that: The invention comprises a catheter, a reinforcing tube and a tube seat, wherein the reinforcing tube is sleeved on the catheter, one end of the reinforcing tube and one end of the catheter are both extended into the interior of the tube seat, the catheter comprises an outer layer, a middle layer, an inner layer and a hydrophilic coating, the hydrophilic coating comprises a first hydrophilic coating and a second hydrophilic coating, and the first hydrophilic coating and the second hydrophilic coating sandwich the outer layer, the middle layer and the inner layer.

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

3. A guide catheter assembly with a hydrophilic coating 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 catheter, and the flared end of the catheter can just be embedded in the end of the second cavity away from the first cavity.

4. A guide catheter assembly with a hydrophilic coating 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 assembly with a hydrophilic coating according to claim 1, characterized in that: The length of the reinforcement tube is shorter than the length of the conduit.

6. A guide catheter assembly with a hydrophilic coating 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 conduit is provided with external threads.

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

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

Images