Excimer laser ablation suction catheter and suction device

Abstract

The utility model provides an excimer laser ablation suction catheter. The excimer laser ablation suction catheter comprises a catheter outer wrapping layer, an optical fiber layer, a guide wire cavity, a suction cavity and an optical fiber pressure sensing device. The guide wire cavity and the suction cavity are independently arranged in the catheter outer wrapping layer. The optical fiber layer is coaxially arranged on the outer ring of the suction cavity, one ends of all optical fibers are flush with or exposed out of the far-end end face of the catheter, and the other ends of all the optical fibers penetrate out of the outer cladding of the catheter to be gathered into a bundle. At least one pressure sensing device in the same direction as the suction cavity extends out of the inner cavity wall of the suction cavity and the tip of the far end. The hemodynamics monitoring system obtains the pressure of a blood vessel in front and whether advancing of the catheter is blocked or not in real time through the pressure sensing device, so that a user is helped to monitor the pressure in the blood flow and the condition of broken obstructions and fragments after plaque ablation in real time, and the suction catheter is controlled to accurately suck the generated broken obstructions and remove the broken obstructions and fragments out of the body. And monitoring if the advancement of the catheter is obstructed.

Description

Technical Field

[0001] The utility model relates to the technical field of laser medical equipment, and in particular to a laser ablation suction catheter and a matching laser ablation suction device for effectively monitoring and sucking peeling materials in a laser ablation working area. Background Art

[0002] Due to lifestyle habits such as smoking, long-term inflammation, and some high-risk factors such as diabetes, hyperlipidemia, and hypertension, it is easy to cause atherosclerosis to accumulate in blood vessels, causing vascular stenosis and affecting physical health. Currently, there are several treatment methods: drug therapy, interventional therapy, and surgical treatment. Among them, interventional therapy is less invasive and has good effects, and is a more popular treatment method.

[0003] Excimer laser ablation uses the photothermal effect, photoacoustic effect, and photochemical effect of excimer laser to cause plaques and thrombus components inside blood vessels to absorb light energy and break, corroding them into fragments smaller than 25μm, thereby achieving the purpose of reducing blood vessel volume.

[0004] Existing excimer laser ablation has achieved the goal of ablating plaques and thrombi inside blood vessels into fragments smaller than 25μm. It can effectively remove thrombi, ablate plaques, remove factors that further aggregate and activate platelets from the source, and promote fibrinolysis. However, it is also known that some thrombus fragments will be generated in the process of breaking up obstructions, which may block blood vessels and cause serious complications. There may also be potential risks if they exist in the bloodstream.

[0005] Therefore, it is necessary to design a real-time pressure sensing catheter system that can simultaneously achieve laser ablation and thrombus aspiration to overcome the above problems. Utility Model Content

[0006] The purpose of this utility model is to provide a real-time pressure sensing excimer laser ablation aspiration catheter for thrombus fragments generated in blood vessels after intravascular laser ablation on the basis of the existing technology, so as to monitor the intravascular pressure and blood flow resistance in real time during the process of laser ablation of diseased plaques in blood vessels, realize rapid and accurate quantification of thrombus fragments, accurately aspirate laser ablation fragments, and solve the problem of complications caused by thrombus fragments generated by laser ablation in blood vessels. Its specific technical solution is as follows:

[0007] In the first aspect, the utility model provides an excimer laser ablation suction catheter, the catheter comprising: a catheter outer cladding, an optical fiber layer, a guidewire cavity, and a suction cavity. The guidewire cavity and the suction cavity are independently arranged at any two locations inside the outer cladding of the catheter, and the guidewire cavity and the suction cavity pass through the outer cladding of the catheter. The optical fiber layer is coaxially arranged on the outer ring of the suction cavity, and the optical fiber layer is composed of a plurality of optical fibers, one end of all optical fibers is flush with or exposed to the distal end face of the catheter, and the other end of the optical fiber passes through the outer cladding of the catheter and is gathered into a bundle. At least one pressure sensing device in the same direction as the suction cavity is arranged on the inner cavity wall of the suction cavity, which is used to monitor the blood pressure in the blood vessel, and then extract data for analysis.

[0008] In combination with the first aspect above, situation one in any possible situation is: the catheter also includes a branch overflow port, a radiopaque marker, and a guidewire port; the branch overflow port is arranged at any point of the catheter outer sheath and is connected to the suction cavity; the guidewire port is arranged at any point of the catheter outer sheath and is connected to the guidewire cavity; the radiopaque marker is arranged on the outer circle of the catheter outer sheath at the distal end of the catheter.

[0009] In combination with the first aspect or situation one mentioned above, situation two in any possible situation is: there are multiple pressure sensing devices, and they are evenly distributed on the inner cavity wall of the suction cavity around the axis of the suction cavity.

[0010] In combination with the first aspect or situations one and two above, situation three in any possible situation is: there are multiple pressure sensing devices, and they are evenly divided into two groups, each group of pressure sensing devices is evenly distributed on the inner wall of the suction chamber around the axis of the suction chamber, and the positions of the two groups are front and back and staggered on the inner wall of the suction chamber.

[0011] In combination with the first aspect or situations one, two, and three above, situation four in any possible situation is: at least one pressure sensor is also provided at the edge of the inner cavity at the distal end of the catheter, and the detection portion of the pressure sensor extends outward from the distal end surface of the catheter. The pressure sensor extending outward from the distal end of the catheter senses whether the catheter encounters resistance and pressure during its advancement into the blood vessel and the direction of the obstacle, helping the doctor to determine whether the front can continue to move forward, and the doctor can also observe through external imaging equipment whether the front of the catheter is blocked by a tortuous blood vessel or a lesion blockage, and determine whether ablation is required.

[0012] In combination with the first aspect or situations one, two, three, and four above, situation five in any possible situation is that the optical fiber of the integrated bundle of foreign exchange on the outer cladding of the catheter is connected to the laser coupling quick-connect interface.

[0013] As a second aspect, the utility model is directed to the first aspect and any possible situation thereof, and is equipped with an excimer laser ablation suction device, the device comprising the above-mentioned excimer laser ablation suction catheter, as well as a laser light source, a hemodynamic monitoring system, and a suction device, wherein:

[0014] The optical fiber in the optical fiber layer of the catheter is connected to the laser light source;

[0015] The suction chamber of the catheter is in communication with the suction device;

[0016] The pressure sensing device of the catheter is data-connected to the hemodynamic monitoring system, and the hemodynamic monitoring system analyzes the blood flow resistance in the blood vessel based on the pressure data monitored by the pressure sensing device; the hemodynamic monitoring system also includes an image processing system and an image display device, and the image processing system converts the blood flow resistance data into image data and displays it through the image display device.

[0017] In combination with the second aspect above, situation six in any possible situation is: the hemodynamic monitoring system is data-connected with the suction control end of the suction device to automatically adjust the execution parameters of the suction device according to the blood flow resistance.

[0018] In combination with the above-mentioned second aspect or situation six, situation seven in any possible situation is: the hemodynamic monitoring system also includes a catheter end mechanical monitoring system, which is used to analyze the pressure data monitored by at least one pressure sensing device extending at the distal end of the catheter to determine whether the movement of the distal end of the catheter is obstructed.

[0019] In combination with the second aspect or situations six and seven above, situation eight in any possible situation is: the hemodynamic monitoring system is integrated into the suction device.

[0020] In combination with the above-mentioned second aspect or situations six, seven, and eight, situation nine in any possible situation is: the optical fiber in the optical fiber layer of the catheter is coupled and connected to a laser ablation device including a laser light source through its laser coupling quick-connect interface to establish an optical path connection between the optical fiber and the laser light source.

[0021] The beneficial effects of the utility model are:

[0022] The excimer laser ablation suction catheter with real-time pressure sensing provided by the utility model ablates the plaque on the blood vessel wall through the optical fiber layer, and the hemodynamic monitoring system obtains the blood vessel pressure in front and analyzes the blood flow resistance in real time through the pressure sensing device. The pressure data is displayed in two or three dimensions on the display device. This helps the user to monitor the pressure in the blood flow and the broken obstruction fragments generated in front of the catheter after ablating the plaque in real time, and control the suction catheter to accurately aspirate the broken obstruction fragments generated and expel them from the body. In addition, the pressure sensor extending from the far end of the catheter can be used to determine whether the catheter encounters resistance and pressure, and the external imaging device can be used to observe whether the blood vessel in front is tortuous or the lesion is blocked and needs to be ablated, so that the doctor can make a judgment. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] 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 labor.

[0024] Figure 1 It is a schematic diagram of the cross-sectional structure of the distal end of the catheter of the present invention;

[0025] Figure 2 It is a partially cutaway schematic diagram of the distal end of the catheter of the utility model;

[0026] Figure 3 It is a schematic diagram of the cross-sectional structure of the distal end of the single-layer optical fiber layer catheter of the utility model;

[0027] Figure 4 It is a schematic diagram of the overall structure of the suction catheter of the utility model;

[0028] Figure 5 It is a partially cutaway schematic diagram of a catheter distal end extension pressure sensing device of the utility model;

[0029] Figure 6 It is a schematic diagram of the overall structure of the suction device of the utility model.

[0030] Figure markings: 1-catheter outer covering, 2-optical fiber layer, 3-guidewire cavity, 4-suction cavity, 5-pressure sensing device, 6-branch overflow port, 7-guidewire port, 8-radiopaque marker, 9-laser coupling quick-plug interface. DETAILED DESCRIPTION

[0031] The technical solution of the utility model is further specifically described below through embodiments and in combination with the accompanying drawings. Obviously, the described embodiments are only partial embodiments of the utility model.

[0032] Embodiment 1, as Figure 1 and Figure 2 As shown, the utility model provides an excimer laser ablation suction catheter, the catheter comprising: a catheter outer cladding 1, an optical fiber layer 2, a guidewire cavity 3, and a suction cavity 4. The guidewire cavity 3 is arranged at the upper part of the inner part of the catheter outer cladding 1, and the suction cavity 4 is independently arranged at the lower part of the guidewire cavity 3 inside the catheter outer cladding 1, and the guidewire cavity 3 and the suction cavity 4 pass through the catheter outer cladding 1. The optical fiber layer 2 is coaxially arranged on the outer ring of the suction cavity 4, and the optical fiber layer 2 is composed of a plurality of optical fibers stacked (such as Figure 1 The multi-layer stacking shown can also be Figure 3 Single layer stacking as shown). One end of all optical fibers is flush with or slightly exposed to the distal end face of the catheter to facilitate laser ablation of the lesion. The other end of the optical fiber passes through the outer cladding 1 of the catheter and is gathered into a bundle. A plurality of pressure sensing devices 5 coaxial with the suction chamber 4 are arranged on the inner wall of the suction chamber 4, and are evenly distributed on the inner wall of the suction chamber 4 around the axis of the suction chamber 4, and are close to the distal end of the catheter or flush with the distal end face. The pressure sensing device 5 is used to monitor the blood pressure in the blood vessel, and then extract data for analysis. In this embodiment, the pressure sensing device 5 is preferably an optical fiber pressure sensor.

[0033] There are multiple pressure sensing devices 5, which are evenly divided into two groups. Each group of pressure sensing devices 5 is evenly distributed on the inner wall of the suction chamber 4 around the axis of the suction chamber 4, and the two groups are positioned front and back and staggered on the inner wall of the suction chamber 4.

[0034] In addition, if Figure 4 As shown, the catheter also includes a branch overflow port 6, a guidewire port 7, and a radiopaque marker 8. The branch overflow port 6 is arranged at the proximal end of the catheter outer layer 1 and is connected to the suction cavity 4, so that it can be connected to an external suction device through the branch overflow port 6 to suction and discharge the lesion peeling material. The guidewire port 7 is arranged at the proximal end of the catheter outer layer 1 and is connected to the guidewire cavity 3, so that the catheter can move forward to the lesion along the guidewire previously inserted into the blood vessel. The radiopaque marker 8 is arranged on the outer ring of the catheter outer layer 1 at the distal end of the catheter, and is used to identify the specific position of the catheter in the blood vessel.

[0035] The optical fiber passing through the outer cladding and the integrated bundle of foreign exchange at the proximal end of the catheter is connected to the laser coupling quick-plug interface 9, so as to be easily connected to the quick-plug coupling interface of the excimer laser ablation device.

[0036] Embodiment 2, as Figure 2As shown, on the basis of Example 1, the arrangement of the pressure sensor is optimized. A plurality of pressure sensing devices 5 are evenly divided into two groups, and each group of pressure sensing devices 5 is evenly distributed on the inner wall of the suction chamber 4 around the axis of the suction chamber 4, and the positions of the two groups are front and back and staggered on the inner wall of the suction chamber 4. Such a design can ensure that the effective pressure monitoring points are not reduced while providing a larger suction operation surface. It can effectively prevent the catheter end face from slowing down the blood flow rate due to too many pressure sensing devices 5, thereby increasing the blood flow resistance. When the blood flow resistance is monitored to be too large (greater than the actual blood flow resistance), the hemodynamic monitoring system will misjudge the increase in the suction power, which will cause damage to the blood vessels. At the same time, it can also prevent the end face pressure sensing devices 5 from being too many, hindering the discharge of the peeling material.

[0037] Embodiment 3, as Figure 5 As shown, on the basis of embodiments 1 and 2, two pressure sensing devices 5 are further provided in the inner cavity at the distal end of the catheter, and the detection portion of the pressure sensing device 5 slightly protrudes outside the distal end surface of the catheter (such as Figure 5 The two pressure sensing devices 5 marked on the right side are not limited to two in number, and the specific number is configured according to actual needs). The pressure sensing device 5 extending outward from the distal end of the catheter senses whether the catheter encounters resistance and pressure and the direction of the obstacle during its advancement into the blood vessel, and uses the catheter end mechanical monitoring system in the hemodynamic monitoring system to analyze the pressure data monitored by the two pressure sensing devices (5) extending outward from the catheter end to determine whether the advancement of the distal end of the catheter is obstructed, thereby helping the doctor determine whether the catheter can continue to move forward. The doctor can also use external imaging equipment to observe whether the obstruction in front of the catheter is a tortuous blood vessel or a lesion obstruction, and determine whether ablation is required.

[0038] Embodiment 4, as Figure 6 As shown, the utility model is directed to the above-mentioned excimer laser ablation suction catheter, and is equipped with an excimer laser ablation suction device, the device comprising the above-mentioned excimer laser ablation suction catheter, an excimer laser ablation device with a laser light source, a hemodynamic monitoring system, and a suction device, wherein:

[0039] The optical fiber in the optical fiber layer 2 of the catheter is coupled and connected to the laser ablation device including a laser light source through its laser coupling quick-plug interface 9, so as to establish an optical path connection between the optical fiber and the laser light source;

[0040] The suction chamber 4 of the catheter is in communication with the suction device;

[0041] The pressure sensing device 5 of the catheter is data-connected with the hemodynamic monitoring system, and the hemodynamic monitoring system analyzes the blood flow resistance in the blood vessel and whether the catheter encounters resistance during its advancement according to the pressure data monitored by the pressure sensing device 5. The hemodynamic monitoring system also includes an image processing system and an image display device, and the image processing system converts the blood flow resistance data and the resistance encountered by the catheter into two-dimensional or three-dimensional image data and then displays them through the image display device, so that the user can control the suction device or know the suction situation, or observe through external imaging equipment whether the blood vessel in front of the blocked catheter is tortuous or the lesion is blocked, and whether ablation is required.

[0042] The above-mentioned method for analyzing intravascular blood flow resistance is as follows:

[0043] S1, input the blood vessel location, blood vessel radius, and total body blood volume as basic analysis data;

[0044] S2, the blood flow Q through the blood vessels can be calculated by the following formula:

[0045] Q = π* r^2 * v,

[0046] Q represents the blood flow through the blood vessels per unit time, r represents the radius of the blood vessels, and v represents the blood flow velocity.

[0047] S3, the blood flow resistance R through the blood vessels can be calculated by the following formula:

[0048] R = ΔP / Q,

[0049] Among them, R represents the blood flow resistance of the blood vessel, and ΔP represents the pressure difference between the two ends of the blood vessel.

[0050] The hemodynamic monitoring system is data-connected to the suction control end of the suction device, analyzes real-time blood flow resistance according to the above method, and calculates and calls preset control parameters according to changes in blood flow resistance, automatically adjusting the suction device to perform different degrees of suction to ensure suction effect and suction safety.

[0051] It should be understood that the above embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. In addition, it should be understood that after reading the content of the present invention, those skilled in the art can make various changes and modifications to the present invention, and these equivalent forms also fall within the scope defined by the claims attached to this application.

Claims

1. An excimer laser ablation suction catheter, the catheter comprising: The catheter outer cladding (1), the optical fiber layer (2), the guidewire cavity (3), and the suction cavity (4) are characterized by: The guidewire cavity (3) and the suction cavity (4) are independently arranged at any two locations inside the outer sheath (1) of the catheter, and the guidewire cavity (3) and the suction cavity (4) pass through the outer sheath (1) of the catheter; The optical fiber layer (2) is coaxially arranged on the outer ring of the suction cavity (4), and the optical fiber layer (2) is composed of a plurality of optical fibers, one end of all the optical fibers is flush with or exposed to the distal end surface of the catheter, and the other ends of the optical fibers pass through the outer cladding (1) of the catheter and are gathered into a bundle; At least one pressure sensing device (5) coaxial with the suction chamber (4) is arranged on the inner wall of the suction chamber (4).

2. The excimer laser ablation suction catheter according to claim 1, characterized in that: The catheter further comprises a branch overflow port (6), a guide wire port (7), and a radiopaque marker (8); the branch overflow port is arranged at any position of the catheter outer layer (1) and is in communication with the suction cavity (4); the guide wire port is arranged at any position of the catheter outer layer (1) and is in communication with the guide wire cavity (3); the radiopaque marker is arranged on the outer ring of the catheter outer layer (1) at the distal end of the catheter.

3. The excimer laser ablation suction catheter according to claim 2, characterized in that: There are a plurality of pressure sensing devices (5), which are evenly distributed on the inner wall of the suction chamber (4) around the axis of the suction chamber (4).

4. The excimer laser ablation suction catheter according to claim 3, characterized in that: There are a plurality of pressure sensing devices (5), which are evenly divided into two groups. Each group of pressure sensing devices (5) is evenly distributed on the inner wall of the suction chamber (4) around the axis of the suction chamber (4), and the two groups are positioned front and back and staggered on the inner wall of the suction chamber (4).

5. The excimer laser ablation suction catheter according to claim 4, characterized in that: At least one pressure sensing device (5) is also provided at the edge of the inner cavity at the distal end of the catheter, and the pressure sensing device (5) protrudes outside the distal end surface of the catheter.

6. An excimer laser ablation suction catheter according to any one of claims 1 to 5, characterized in that: The outer cladding (1) of the catheter is connected to the optical fiber of the integrated bundle with the laser coupling quick-plug interface (9).

7. An excimer laser ablation suction device, characterized in that: The device comprises an excimer laser ablation suction catheter as claimed in any one of claims 1 to 6, as well as a laser light source, a hemodynamic monitoring system, and a suction device, wherein: The optical fiber in the optical fiber layer (2) of the catheter is connected to the laser light source; The suction chamber (4) of the catheter is in communication with the suction device; The pressure sensing device (5) of the catheter is data-connected to the hemodynamic monitoring system, and the hemodynamic monitoring system analyzes the blood flow resistance in the blood vessel based on the pressure data monitored by the pressure sensing device (5); the hemodynamic monitoring system also includes an image processing system and an image display device, and the image processing system converts the blood flow resistance data into image data and displays it through the image display device.

8. The excimer laser ablation suction device according to claim 7, characterized in that: The hemodynamic monitoring system is data-connected to the suction control end of the suction device, and automatically adjusts the execution parameters of the suction device according to the blood flow resistance.

9. The excimer laser ablation suction device according to claim 8, characterized in that: The hemodynamic monitoring system also includes a catheter end mechanical monitoring system for analyzing pressure data monitored by at least one pressure sensing device (5) extending outward from the distal end of the catheter as described in claim 5 or 6 to determine whether the movement of the distal end of the catheter is obstructed.

10. The excimer laser ablation suction device according to claim 9, characterized in that: According to claim 6, the optical fiber in the optical fiber layer (2) of the catheter is coupled to a laser ablation device including a laser light source through its laser coupling quick-connect interface (9), thereby establishing an optical path connection between the optical fiber and the laser light source.

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