Coronary artery thrombus suction catheter

Abstract

The utility model provides a coronary artery thrombus suction catheter, and belongs to the technical research field of medical instruments. In order to solve the problems that an existing conveying catheter for measuring thrombus is inconvenient to operate and is not beneficial to follow-up thrombus removal, a blocking air bag is arranged on the outer side of a suction catheter, and an auxiliary suction hole is formed in a port of the suction catheter; during use, after the suction catheter penetrates through a thrombus to measure the length of the thrombus, the plugging air bag is inflated to block blood flow in a blood vessel, so that the thrombus is prevented from flowing away along the blood; in the subsequent thrombus removal process, thrombus located between the outer wall of the suction catheter and the inner wall of the blood vessel can enter the inner cavity of the suction catheter from the auxiliary suction hole, in this way, the thrombus can be thoroughly removed, the structure is simple, and operation is convenient.

Description

Technical Field

[0001] The utility model belongs to the research field of medical device technology, and specifically relates to a coronary thrombus aspiration catheter. Background Art

[0002] The main pathogenesis of acute ST-segment elevation myocardial infarction (STEMI) is the blockage of blood flow by coronary artery thrombosis. Usually, the treatment is carried out by extracting the blocked thrombus in the blood vessel, dissolving the thrombus with thrombolytic drugs, or implanting stents. In order to effectively and completely remove the thrombus and reduce the residual thrombus in the blood vessel, it is necessary to accurately evaluate the size and hardness of the thrombus and other important parameters before or during the operation, so as to provide a reference for doctors to adjust the dosage of thrombolytic drugs.

[0003] The patent with the publication number CN114681756A discloses a delivery catheter, including a catheter body, a flexible pressure sensor, a marker and a wire; wherein the flexible pressure sensor is accommodated in the inner space at the distal end of the catheter body and is integrated, and the flexible pressure sensor includes a flexible pressure sensitive unit whose resistance value can be changed due to deformation of any position at the distal end of the catheter body. In the process of the delivery catheter moving toward the distal end of the blood vessel, it needs to pass through the thrombus or plaque area. When the delivery catheter is moving in pure blood, its distal pressure should be maintained within a certain range; after entering the thrombus or plaque, the solid tissue squeezes the distal force ring of the delivery catheter greater than the liquid squeeze, so that the pressure value given by the flexible pressure sensor will increase, and when the distal end passes through the thrombus or plaque area, its pressure value will decrease. By observing the changes in the pressure value of the flexible pressure sensor, the size of the thrombus or plaque area can be indicated to the clinician.

[0004] However, the above technical solution requires the delivery catheter to pass through the entire thrombus so that the pressure sensor can measure. Therefore, the thrombus is squeezed between the outer wall of the delivery catheter and the inner wall of the blood vessel, making it difficult to remove the thrombus and the thrombus removal is not complete. Utility Model Content

[0005] The utility model aims to overcome the problems that the existing thrombus measurement delivery catheter is difficult to remove thrombus and the thrombus removal is not thorough.

[0006] In order to achieve the above-mentioned purpose, the technical idea adopted by the utility model is as follows: a blocking airbag is provided on the outside of the suction catheter and an auxiliary suction hole is provided at the port of the suction catheter; when in use, after the suction catheter penetrates the thrombus and measures the length of the thrombus, the blocking airbag is inflated to block the blood flow in the blood vessel, thereby preventing the thrombus from flowing away with the blood; and then in the subsequent thrombus removal process, the thrombus located between the outer wall of the suction catheter and the inner wall of the blood vessel can be allowed to enter the inner cavity of the suction catheter from the auxiliary suction hole, so that the thrombus can be completely removed, and the structure is simple and the operation is convenient.

[0007] Based on the above technical ideas, the technical solution adopted by the utility model is:

[0008] A coronary thrombus aspiration catheter, comprising a pressure sensor, an aspiration catheter body and a guide wire cavity, wherein the pressure sensor and the guide wire cavity are both connected to the aspiration catheter body, and further comprising:

[0009] A blocking airbag is arranged on the suction catheter body;

[0010] The suction catheter body is also provided with an auxiliary suction hole, and the auxiliary suction hole is located between the pressure sensor and the blocking airbag.

[0011] To further limit the above technical solution, preferably, the blocking airbag includes an inner airbag connecting portion and an outer airbag connecting portion;

[0012] The inner airbag connecting portion is connected to the outer airbag connecting portion.

[0013] As a further limitation of the above technical solution, the auxiliary suction hole is a diamond-shaped opening.

[0014] As a further limitation of the above technical solution, the auxiliary suction holes are grid-shaped openings.

[0015] Beneficial effects of the utility model:

[0016] The utility model provides a blocking airbag on the outside of the suction catheter and an auxiliary suction hole at the port of the suction catheter. When in use, after the suction catheter body penetrates the thrombus and measures the length of the thrombus, the blocking airbag is inflated to block the blood flow in the blood vessel, thereby preventing the thrombus from flowing away with the blood. In the subsequent thrombus removal process, the thrombus located between the outer wall of the suction catheter body and the inner wall of the blood vessel can be introduced into the inner cavity of the suction catheter through the auxiliary suction hole, so that the thrombus can be completely removed, and the structure is simple and the operation is convenient.

[0017] In addition, the auxiliary suction hole provided by the utility model is a diamond-shaped opening. In this way, when the suction catheter body penetrates the thrombus, due to the small corners of the diamond-shaped opening, the thrombus located on the outer wall of the suction catheter body and the inner wall of the blood vessel is squeezed to the corners of the diamond-shaped auxiliary suction hole, preventing the thrombus from moving in the opposite direction of the suction catheter body, and further preventing the broken thrombus from flowing away along the blood flow.

[0018] The auxiliary suction holes provided by the utility model are grid-shaped openings. The auxiliary suction holes with grid-shaped openings can increase the friction between the thrombus and the outer wall of the suction catheter body, further prevent the thrombus from moving in the opposite direction of the suction catheter body, prevent the thrombus from breaking, and facilitate subsequent thrombus removal. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 A schematic diagram of the structure of a coronary thrombus aspiration catheter provided in Example 1;

[0021] Figure 2 for Figure 1 A cross-sectional view of a coronary thrombus aspiration catheter is shown;

[0022] Figure 3 for Figure 1 The state diagram of the occluding balloon being expanded is shown;

[0023] Figure 4 for Figure 3 The schematic diagram of the use scenario of the blocking airbag shown;

[0024] Figure 5 A schematic diagram of the structure of a coronary thrombus aspiration catheter provided in Example 2;

[0025] Figure 6 A schematic diagram of the structure of a coronary thrombus aspiration catheter provided in Example 3;

[0026] Figure 7 This is a diagram showing the usage status of the blocking airbag provided in Example 3.

[0027] Among them, 1. pressure sensor; 2. blocking balloon; 3. suction catheter; 4. guide wire cavity; 5. auxiliary suction hole; 6. first balloon tube; 7. indicator; 8. pressure sensor wire; 9. thrombus. DETAILED DESCRIPTION

[0028] In the description of the present invention, it should be understood that the terms "length direction", "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0029] Terms such as "horizontal" and "vertical" do not mean that the components must be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0030] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" 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 a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] In order to make the purpose, technical solution and advantages of the embodiments of the present utility model clearer, the technical solution in the embodiments of the present utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the present utility model. Example 1

[0032] like Figure 1-4 As shown, a coronary thrombus aspiration catheter provided by the utility model includes a pressure sensor 1, a blocking balloon 2, an aspiration catheter body 3 and a guide wire cavity 4. The guide wire cavity 4 is arranged outside the aspiration catheter body 3 and is fixedly connected to the aspiration catheter body 3.

[0033] Specifically, the pressure sensor 1 is in close contact with the surface of the suction catheter body 3 and the guide wire cavity 4, and is fixedly arranged at the port of the suction catheter 1 so as to detect the change of the pressure value when it contacts the thrombus. When the suction catheter body 3 reaches the thrombus position, the pressure value monitored by the pressure sensor 1 changes. When the suction catheter body 3 penetrates the thrombus, the pressure value of the pressure sensor 1 changes again. The pressure sensor 1 transmits the pressure signal to the monitoring device outside the patient's body through the pressure sensor wire 8. Specifically, as Figure 2As shown, the pressure sensor wire 8 is buried in the suction catheter body 3.

[0034] The suction catheter body 3 is also provided with a mark 7. When in use, after the suction catheter body 3 completely penetrates the thrombus, the thrombus can be angiographically obtained to obtain the blood vessel diameter, and the thrombus length can be measured in combination with the mark 7. In this way, the volume of the thrombus can be calculated based on the blood vessel diameter and the thrombus length, and then the dosage of the thrombolytic drug can be determined based on the thrombus volume. This embodiment is described by taking the example that five marks 7 are provided on the suction catheter body 3, and the distance between two adjacent marks is 1 mm.

[0035] The blocking balloon 2 is sleeved on the suction catheter body 3. The blocking balloon 2 is a gourd-shaped structure with an opening in the center, so that it can be in close contact with the surface of the suction catheter body 3 and the guide wire cavity 4, and completely wrap the suction catheter body 3 and the guide wire cavity 4; when in use, the blocking balloon 2 is inflated so that the blocking balloon 2 blocks the blood vessel, stops the blood flow, and prevents the broken thrombus from flowing away with the blood.

[0036] Specifically, the end of the blocking airbag 2 is provided with a first airbag tube 6 connected thereto, and the end of the first airbag tube 6 extends out of the patient's body; specifically, the end of the first airbag tube 6 is provided with an inflation switch so that medical staff can inflate the patient's blocking airbag 2.

[0037] Clinical Cases:

[0038] Zhao, a 42-year-old male, came to the clinic with chest pain for 2 hours. The electrocardiogram showed ST segment elevation in leads V1-5. Emergency coronary angiography showed occlusion of the proximal left anterior descending branch, with visible thrombus shadows. It was decided to perform coronary artery thrombus aspiration. The guiding catheter was sent to the opening of the left main trunk, and the working guidewire was sent through the thrombus lesion to the distal end of the left anterior descending branch.

[0039] Pre-operative preparation:

[0040] The surgical site was locally anesthetized, and the patient was subjected to an iodine allergy test, and the platelet count, bleeding and coagulation time, prothrombin time, electrolytes, liver and kidney function, etc. were checked.

[0041] Step 1: Flush the sheath to activate the hydrophilic coating, draw 5-10 ml of heparinized saline with a suction syringe, and connect the suction extension line and syringe to the suction catheter;

[0042] Step 2: Open the stopcock, flush the entire suction system with heparinized saline, and close the stopcock to ensure it is in the closed state;

[0043] Step 4: insert the working guide wire into the guide wire cavity, and insert the suction catheter body 3 into the patient's coronary artery along the working guide wire under the perspective state, and gently and slowly push the suction tube forward; when the pressure sensor 1 arranged at the front end of the suction catheter body 3 detects the pressure change for the first time, it means that the suction catheter body 3 has reached the thrombus position;

[0044] Step 5: Continue to convey the suction catheter body 3 forward until the pressure sensor 1 detects a pressure change again, which indicates that the suction catheter body 3 has completely penetrated the thrombus;

[0045] Step 6: Perform angiography of the patient's coronary artery through the guiding catheter, determine the length of the thrombus in combination with the marker 7, and calculate the volume of the thrombus 9 according to the diameter of the blood vessel, and then determine the dosage of the thrombolytic drug according to the volume of the thrombus 9;

[0046] Step 7: injecting thrombolytic drugs through the suction catheter body 3, and the thrombolytic drugs dissolve the thrombus along the front end port of the suction catheter body 3;

[0047] Step 8: Connect the syringe to the extracorporeal port of the suction catheter body 3, pull the piston in the syringe outward to make it at the maximum negative pressure, rotate the piston clockwise to lock the syringe, and then draw the dissolved thrombus out of the patient's body from the front end port of the suction catheter body 3, i.e., the main suction port;

[0048] At the same time, in the process of extracting the dissolved thrombus from the suction catheter body 3, the thrombus located between the outer wall of the suction catheter body 3 and the inner wall of the blood vessel enters the inner cavity of the suction catheter body 3 from the auxiliary suction hole 5, and then is discharged from the patient's body from the inner cavity of the suction catheter body 3;

[0049] Step 8: After the suction is completed, the blocking balloon 2 is deflated, and then the suction catheter body 3 is slowly withdrawn and removed under negative pressure and fluoroscopy. Example 2

[0050] Based on Example 1, the difference from Example 1 is that Figure 5 As shown, the auxiliary suction hole 5 provided in this embodiment is a diamond-shaped opening. When the suction catheter body 3 penetrates the thrombus 9, the thrombus 9 is squeezed between the suction catheter body 3 and the blood vessel. Since the auxiliary suction hole 5 is a diamond-shaped opening and the corners of the diamond-shaped opening are small, the thrombus 9 is limited by the corners of the diamond-shaped opening during the squeezing process, preventing the thrombus 9 from moving in the opposite direction of the suction catheter body 3. Example 3

[0051] Based on Example 1, what is different from both Example 1 and Example 2 is that Figure 6As shown, the auxiliary suction holes 5 provided in this embodiment are grid-shaped openings. In the process of the suction catheter body 3 penetrating the thrombus 9, the auxiliary suction holes 5 with grid-shaped openings can increase the friction between the thrombus 9 and the suction catheter body 3, further preventing the thrombus 9 from moving in the opposite direction of the suction catheter body 3, preventing the thrombus 9 from breaking, and facilitating the subsequent thrombus removal. Example 4

[0052] Based on Example 1, different from Examples 1, 2 and 3, in order to improve the blocking effect of the blocking airbag 2, the blocking airbag 2 provided in this embodiment includes an inner airbag connecting portion 21 and an outer airbag connecting portion 22, wherein the inner airbag connecting portion 21 and the outer airbag connecting portion 22 are connected correspondingly. Specifically, the inner airbag connecting portion 21 and the outer airbag connecting portion 22 are connected as one piece.

[0053] The inner airbag connecting portion 21 is a gourd-shaped connecting cloth with an opening in the center; the outer airbag connecting portion 22 is a circular connecting portion. Figure 7 As shown, after the blocking balloon 3 is inflated, the inner balloon connection part 21 fits the guide wire cavity 4 and the suction catheter body 3, while the outer balloon connection part 22 fits the inner wall of the blood vessel more closely, further improving the blocking effect of the blocking balloon 2 in blocking blood flow.

[0054] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

Claims

1. A coronary thrombus aspiration catheter, comprising a pressure sensor (1), an aspiration catheter body (3) and a guide wire lumen (4), wherein the pressure sensor (1) and the guide wire lumen (4) are both connected to the aspiration catheter body (3), and characterized in that: Also includes: A blocking airbag (2) arranged on the suction catheter body (3); The suction catheter body (3) is also provided with an auxiliary suction hole (5), and the auxiliary suction hole (5) is located between the pressure sensor (1) and the blocking airbag (2).

2. A coronary thrombus aspiration catheter according to claim 1, characterized in that: The blocking airbag (2) comprises an inner airbag connecting portion (21) and an outer airbag connecting portion (22); The inner airbag connecting portion (21) is connected to the outer airbag connecting portion (22).

3. A coronary thrombus aspiration catheter according to claim 1, characterized in that: The auxiliary suction hole (5) is a diamond-shaped opening.

4. The coronary thrombus aspiration catheter according to claim 1, characterized in that: The auxiliary suction holes (5) are grid-shaped openings.

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