Double-cavity micro catheter with blood vessel pressure measuring function
By integrating the pressure sensor onto a dual-lumen microcatheter, the flexibility and durability of the guide wire are maintained, addressing operation challenges and reducing radiation exposure during cardiovascular interventions.
Patent Information
- Application Number
- CN202421771704.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-25
- Publication Date
- 2025-07-15
- Estimated Expiration
- 2034-07-25
AI Technical Summary
In the prior art, the integration of the pressure sensor on the guide wire causes the softness of the guide wire to decrease, increasing the difficulty of the doctor's operation and the patient's radiation exposure time.
Weld the pressure sensor to the dual cavity microcatheter and a deflection layer and a braided mesh are provided outside the guide wire cavity to ensure the flexibility and strength of the guide wire, while optimizing the push direction of the guide wire to avoid the impact on the measurement.
It improves the passability of the guidewire, reduces the difficulty of the doctor's operation and the radiation exposure time of the patient, and ensures the accuracy of vascular pressure measurement and the radiation safety of the patient.
Smart Images
Figure CN223095963U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of interventional medical devices, in particular to a double-lumen microcatheter with a blood vessel pressure measurement function. Background Art
[0002] A double-lumen microcatheter is a special microcatheter that has two wire lumens and can be used for complex percutaneous coronary intervention by controlling two different guide wires. As a commonly used guide wire in percutaneous coronary intervention, a pressure guide wire integrates a pressure sensor on a flexible guide wire and inserts the guide wire into the coronary artery through a catheter. By measuring the blood flow pressure values at different positions in the blood vessel, the lesion location can be determined, which helps doctors accurately understand the internal situation of the blood vessel and perform treatment. However, the rigid substrate of the pressure sensor will reduce the softness of the part of the guide wire integrated with the pressure sensor after it is integrated onto the guide wire, increasing the operation difficulty and operation time for doctors. This not only brings discomfort to patients but also increases the exposure time of patients under radiation. Summary of the Utility Model
[0003] The purpose of the utility model is to provide a double-lumen microcatheter with a blood vessel pressure measurement function in view of the deficiencies of the prior art. By welding the pressure sensor originally integrated on the guide wire to the double-lumen microcatheter, the double-lumen microcatheter can acquire the function of obtaining the pressure at the distal end of the lesion while solving the drawback of poor passability of the pressure guide wire.
[0004] To achieve the above purpose, the utility model adopts the following technical solutions:
[0005] A double-lumen microcatheter with a blood vessel pressure measurement function, comprising a double-lumen microcatheter body, a first guide wire lumen and a second guide wire lumen. The double-lumen microcatheter body is sequentially provided with an insertion section, a pressure sensing section, a double-lumen tube section and an operation section from left to right. A radiopaque ring is fixed on the outer circle of the insertion section. A groove is provided above the rear end of the pressure sensing section, and a pressure sensor is welded and fixed in the groove. The signal output end of the pressure sensor is connected with a connecting wire. One end of the connecting wire is connected with the pressure sensor, and the other end passes through the double-lumen tube section and the operation section in sequence and then is connected with a pressure signal display device. Arc-shaped notches are dug above the front end and below the rear end of the double-lumen tube section. A radiopaque block is fixed on the double-lumen microcatheter body behind the arc-shaped notch above the front end of the double-lumen tube section. The first guide wire lumen is arranged below the double-lumen microcatheter body. The first guide wire lumen takes the left side surface of the arc-shaped notch below the rear end of the double-lumen tube section as the inlet and the top surface of the front end of the insertion section as the outlet, and sequentially penetrates through the double-lumen tube section, the pressure sensing section and the lower tube body of the insertion section. The second guide wire lumen is arranged above the double-lumen microcatheter body. The second guide wire lumen takes the bottom surface of the rear end of the operation section as the inlet and the right side surface of the arc-shaped notch above the front end of the double-lumen tube section as the outlet, and sequentially penetrates through the operation section and the upper tube body of the double-lumen tube section.
[0006] Specifically, the double-lumen microcatheter further comprises a main guide wire and a branch guide wire. The main guide wire and the branch guide wire respectively correspond to the first guide wire lumen and the second guide wire lumen, and relative sliding can occur between the main guide wire and the first guide wire lumen and between the branch guide wire and the second guide wire lumen.
[0007] In the above technical solution, similar to the traditional microcatheter, the materials of the first guide wire lumen and the second guide wire lumen in the double-lumen microcatheter body are polytetrafluoroethylene (PTFE), so as to ensure that the main guide wire and the branch guide wire can slide smoothly in the corresponding guide wire lumens. Similarly, a functional coating is provided on the outer surface of the double-lumen microcatheter body, and the functional coating includes but is not limited to a lubricating coating, a hydrophilic coating, an antibacterial coating, etc.
[0008] Specifically, a first deflection layer is provided on the outer circles of the first guide wire lumen and the second guide wire lumen, and a first braided mesh is arranged in the first deflection layer.
[0009] Furthermore, a winding layer is further provided on the outer circle of the first deflection layer of the second guide wire lumen. The connecting wire is triggered by the signal output end of the pressure sensor, straightly arranges for a certain distance and then enters the winding layer, and winds spirally along the outer wall of the first deflection layer until it passes out from the outlet at the rear end of the operation section and is connected with the pressure display device.
[0010] In the above technical solution, part of the connecting wire winds spirally along the outer wall of the first deflection layer. Such a design enables the double-lumen microcatheter body to have a certain resilience even when it undergoes repeated bending deformation, effectively avoiding being directly pulled off or broken due to repeated bending.
[0011] Furthermore, a second deflection layer is also provided between the winding layer and the outer ring of the first deflection layer outside the first wire guiding cavity, and a second braided mesh is arranged inside the second deflection layer.
[0012] In the above technical solution, the braided meshes inside the first deflection layer and the second deflection layer enable the double-lumen microcatheter body to have good tensile strength and anti-bending ability without losing flexibility, thereby increasing the strength and pushing force of the double-lumen microcatheter body.
[0013] Preferably, the double-lumen microcatheter body is tapered from the front end of the double-lumen tube section to the top of the insertion section.
[0014] Preferably, the braiding density of the second braided mesh is less than that of the first braided mesh; the thickness of the second braided mesh is greater than that of the first braided mesh.
[0015] Furthermore, the first braided mesh and the second braided mesh are woven from metal wires, and the metal wire material is stainless steel.
[0016] Preferably, in order to help doctors better locate the measurement position of blood vessel pressure, the radiopaque ring is provided at a position 1 mm from the top of the insertion section, the interval between the pressure sensor and the radiopaque ring is 3 mm; the widths of the radiopaque ring and the radiopaque block are 1 mm.
[0017] Preferably, after the branch guide wire extending from the outlet of the second wire guiding cavity is lifted by the left side of the arc-shaped notch above the front end of the double-lumen tube section, the included angle U between the pushing direction of the branch guide wire and the horizontal direction is ≥5°.
[0018] In the above technical solution, the double-lumen microcatheter body is tapered from the front end of the double-lumen tube section to the top of the insertion section. Combined with the arc-shaped notch structure above the front end of the double-lumen tube section, it can make the included angle between the pushing direction of the branch guide wire and the horizontal direction after the branch guide wire extends from the outlet of the second wire guiding cavity, which is convenient for doctors to treat branch lesions while avoiding the influence of the branch guide wire on the measurement of the pressure sensor located at the front end of the outlet of the second wire guiding cavity, thus ensuring the accuracy of the blood vessel pressure measurement result.
[0019] Compared with the prior art, the present utility model has the following beneficial effects:
[0020] 1. By welding the pressure sensor originally integrated on the guide wire to the double-lumen microcatheter, the double-lumen microcatheter of the present utility model not only has the function of obtaining the pressure at the distal end of the lesion, but also solves the drawback of poor passability of the pressure guide wire. While reducing the operation difficulty and time of the doctor for the guide wire, it shortens the exposure time of the patient under the radiation, ensuring the radiation safety of the patient during the operation.
[0021] 2. The double-lumen microcatheter of the present utility model is provided with a deflection layer outside the guide wire lumen. The braided mesh inside the deflection layer enables the main body of the double-lumen microcatheter to have good tensile strength and anti-bending ability without losing flexibility, thereby increasing the strength and pushing force of the main body of the double-lumen microcatheter.
[0022] 3. The main body of the double-lumen microcatheter of the present utility model is tapered from the front end of the double-lumen tube section to the top of the insertion section. Combined with the arc-shaped notch structure above the front end of the double-lumen tube section, it enables the branch guide wire to form a certain angle with the horizontal direction after extending from the outlet of the second guide wire lumen. While facilitating the doctor's treatment of branch lesions, it effectively avoids the influence of the branch guide wire on the measurement of the pressure sensor located at the front end of the outlet of the second guide wire lumen, thus ensuring the accuracy of the blood vessel pressure measurement result and facilitating the doctor to grasp the internal situation of the blood vessel. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] Figure 1 It is the front view of a double-lumen microcatheter with a blood vessel pressure measurement function according to the present utility model.
[0024] Figure 2 It is the top view of a double-lumen microcatheter with a blood vessel pressure measurement function according to the present utility model.
[0025] Figure 3 It is the cross-sectional view of the double-lumen tube section of the present utility model;
[0026] Figure 4 It is the schematic structural diagram of the braided mesh in the first deflection layer of the present utility model.
[0027] Figure 5 It is the wiring diagram of the connecting wires inside the double-lumen microcatheter of the present utility model.
[0028] Figure 6 It is the schematic diagram of the angle between the pushing direction of the branch guide wire and the horizontal direction after the branch guide wire extends from the outlet of the second guide wire lumen of the present utility model.
[0029] In the figure: 1. Main body of the double-lumen microcatheter; 2. First guide wire lumen; 3. Second guide wire lumen; 4. Insertion section; 5. Pressure sensing section; 6. Double-lumen tube section; 7. Operation section; 8. Marking ring; 9. Groove; 10. Pressure sensor; 11. Connecting wire; 12. Marking block; 13. Main guide wire; 14. Branch guide wire; 15. First deflection layer; 16. First braided mesh; 17. Winding layer; 18. Second deflection layer; 19. Second braided mesh. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0030] To facilitate the understanding of the present utility model, the present utility model will be described more comprehensively below with reference to the relevant drawings. Several embodiments of the present utility model are given in the drawings. However, the present utility model can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the disclosure of the present utility model more thorough and comprehensive.
[0031] Embodiment
[0032] As Figure 1 And Figure 2 As shown, the present utility model provides a double - lumen micro - catheter with a blood vessel pressure measurement function, which includes a double - lumen micro - catheter body 1, a first guide wire lumen 2, and a second guide wire lumen 3. The double - lumen micro - catheter body 1 is sequentially provided with an insertion section 4, a pressure sensing section 5, a double - lumen tube section 6, and an operation section 7 from left to right. A radiopaque ring 8 is fixed on the outer circle of the insertion section 4. A groove 9 is provided above the rear end of the pressure sensing section 5, and a pressure sensor 10 is fixedly welded in the groove 9. The signal output end of the pressure sensor 10 is connected with a connection wire 11. One end of the connection wire 11 is connected with the pressure sensor 10, and the other end passes through the double - lumen tube section 6 and the operation section 7 in sequence and is connected with a pressure signal display device. Arc - shaped notches are dug above the front end and below the rear end of the double - lumen tube section 6, and a radiopaque block 12 is fixed on the double - lumen micro - catheter body 1 behind the arc - shaped notch above the front end of the double - lumen tube section 6; The first guide wire lumen 2 is arranged below the double - lumen micro - catheter body 1. The first guide wire lumen 2 takes the left side surface of the arc - shaped notch below the rear end of the double - lumen tube section 6 as the inlet and the top surface of the front end of the insertion section 4 as the outlet, and sequentially penetrates through the double - lumen tube section 6, the pressure sensing section 5, and the lower tube body of the insertion section 4; The second guide wire lumen 3 is arranged above the double - lumen micro - catheter body 1. The second guide wire lumen 3 takes the bottom surface of the rear end of the operation section 7 as the inlet and the right side surface of the arc - shaped notch above the front end of the double - lumen tube section 6 as the outlet, and sequentially penetrates through the operation section 7 and the upper tube body of the double - lumen tube section 6.
[0033] In this embodiment, the double - lumen micro - catheter further includes a main guide wire 13 and a branch guide wire 14. The main guide wire 13 and the branch guide wire 14 respectively correspond to the first guide wire lumen 2 and the second guide wire lumen 3, and relative sliding can occur between the main guide wire 13 and the first guide wire lumen 2, and between the branch guide wire 14 and the second guide wire lumen 3.
[0034] In this embodiment, similar to traditional micro - catheters, the materials of the first guide wire lumen 2 and the second guide wire lumen 3 in the double - lumen micro - catheter body 1 are polytetrafluoroethylene (PTFE) to ensure that the main guide wire and the branch guide wire can slide smoothly in the corresponding guide wire lumens; Similarly, a functional coating is provided on the outer surface of the double - lumen micro - catheter body, and the functional coating includes but is not limited to a lubricating coating, a hydrophilic coating, an antibacterial coating, etc.
[0035] As Figure 3As shown, a first deflection layer 15 is provided on the outer circles of the first guide wire cavity 2 and the second guide wire cavity 3, and a first braided mesh 16 is arranged inside the first deflection layer 15; a second deflection layer 18 is further provided on the outer circle of the winding layer 17 and the first deflection layer 15 outside the first guide wire cavity 2, and a second braided mesh 19 is arranged inside the second deflection layer 18.
[0036] Specifically, the structure of the first braided mesh 16 is as Figure 4 shown. The second braided mesh 19 has a similar braiding structure to the first braided mesh 16. The difference is that the first braided mesh 16 is arranged inside the annular first deflection layer, the second braided mesh 19 is arranged inside the runway-shaped second deflection layer 18, and the braiding density of the second braided mesh 19 is less than that of the first braided mesh 16, and the thickness of the second braided mesh 19 is greater than that of the first braided mesh 16.
[0037] Both the first braided mesh 16 and the second braided mesh 19 are woven from metal wires, and the metal wire material is stainless steel.
[0038] In this embodiment, the braided meshes inside the first deflection layer 15 and the second deflection layer 18 enable the double-lumen microcatheter body 1 to have good tensile strength and anti-bending ability without losing flexibility, thereby increasing the strength and pushing force of the double-lumen microcatheter body 1.
[0039] As Figure 5 shown, a winding layer 17 is further provided on the outer circle of the second guide wire cavity 3 outside the first deflection layer 15. The connection wire 11 is triggered by the signal output end of the pressure sensor 10, runs straight for a certain distance and then enters the winding layer 17, and winds spirally along the outer wall of the first deflection layer 15 until it passes through the outlet at the rear end of the operation section 7 and is connected to the pressure display device.
[0040] In this embodiment, part of the connection wire 11 winds spirally along the outer wall of the first deflection layer 15. Such a design enables the connection wire 11 to have a certain resilience even when the double-lumen microcatheter body 1 undergoes repeated bending deformation, effectively avoiding being directly pulled off or broken due to repeated bending.
[0041] In order to help the doctor better locate the measurement position of the blood vessel pressure, the imaging ring 8 is arranged at a position 1 mm from the top end of the insertion section 4, and the interval between the pressure sensor 10 and the imaging ring 8 is 3 mm; the widths of the imaging ring 8 and the imaging block 12 are 1 mm.
[0042] In this embodiment, as Figure 6 shown, the double-lumen microcatheter body 1 is tapered from the front end of the double-lumen tube section 6 to the top end of the insertion section 4; after the branch guide wire 14 extending from the outlet of the second guide wire cavity 3 is lifted by the left side of the arc-shaped notch above the front end of the double-lumen tube section 6, the included angle U between the pushing direction of the branch guide wire 14 and the horizontal direction is ≥5°.
[0043] The above design enables the branch guide wire 14 to form a certain angle with the horizontal direction after extending from the outlet of the second guide wire lumen 3. While facilitating the doctor's treatment of branch lesions, it avoids the influence of the branch guide wire 14 on the measurement of the pressure sensor 10 located at the front end of the outlet of the second guide wire lumen 3, thereby ensuring the accuracy of the blood vessel pressure measurement result.
[0044] In summary, by welding the pressure sensor originally integrated on the guide wire to the double-lumen microcatheter, the present utility model enables the double-lumen microcatheter to have the function of obtaining the pressure at the distal end of the lesion, solves the drawback of poor passability of the pressure guide wire, reduces the operation difficulty and time of the doctor on the guide wire, shortens the exposure time of the patient under the radiation, and ensures the radiation safety of the patient during the operation.
[0045] It should be understood that the above description of the preferred embodiment is relatively detailed, and it should not be considered as a limitation to the scope of patent protection of the present utility model. Under the inspiration of the present utility model, those of ordinary skill in the art can also make substitutions or deformations without departing from the scope protected by the claims of the present utility model, and all fall within the protection scope of the present utility model. The scope of protection requested by the present utility model shall be subject to the appended claims.
Claims
1. A double-lumen microcatheter with a vascular pressure measurement function, characterized in that, It includes a double-lumen microcatheter body (1), a first guide wire lumen (2) and a second guide wire lumen (3). The double-lumen microcatheter body (1) is sequentially provided with an insertion section (4), a pressure sensing section (5), a double-lumen tube section (6) and an operation section (7) from left to right. A radiopaque ring (8) is fixed on the outer circle of the insertion section (4). A groove (9) is provided above the rear end of the pressure sensing section (5). A pressure sensor (10) is fixedly welded in the groove (9). The signal output end of the pressure sensor (10) is connected with a connection wire (11). One end of the connection wire (11) is connected with the pressure sensor (10), and the other end passes through the double-lumen tube section (6) and the operation section (7) in sequence and then is connected with a pressure signal display device. Arc-shaped notches are dug above the front end and below the rear end of the double-lumen tube section (6). A radiopaque block (12) is fixed on the double-lumen microcatheter body (1) behind the arc-shaped notch above the front end of the double-lumen tube section (6); The first guide wire lumen (2) is arranged below the double-lumen microcatheter body (1). The first guide wire lumen (2) takes the left side surface of the arc-shaped notch below the rear end of the double-lumen tube section (6) as the inlet and the top surface of the front end of the insertion section (4) as the outlet, and sequentially penetrates through the double-lumen tube section (6), the pressure sensing section (5) and the lower tube body of the insertion section (4); The second guide wire lumen (3) is arranged above the double-lumen microcatheter body (1). The second guide wire lumen (3) takes the bottom surface of the rear end of the operation section (7) as the inlet and the right side surface of the arc-shaped notch above the front end of the double-lumen tube section (6) as the outlet, and sequentially penetrates through the operation section (7) and the upper tube body of the double-lumen tube section (6).
2. The double-lumen microcatheter with a blood vessel pressure measurement function according to claim 1, wherein, It further includes a main guide wire (13) and a branch guide wire (14). The main guide wire (13) and the branch guide wire (14) respectively correspond to the first guide wire lumen (2) and the second guide wire lumen (3), and relative sliding can occur between the main guide wire (13) and the first guide wire lumen (2), and between the branch guide wire (14) and the second guide wire lumen (3).
3. The double-lumen microcatheter with a blood vessel pressure measurement function according to claim 2, characterized in that, A first deflection layer (15) is provided on the outer circles of the first guide wire lumen (2) and the second guide wire lumen (3), and a first braided mesh (16) is arranged in the first deflection layer (15).
4. The dual-lumen microcatheter with a blood vessel pressure measurement function according to claim 3, characterized in that, A winding layer (17) is further provided on the outer circle of the second guide wire lumen (3) outside the first deflection layer (15). The connection wire (11) is triggered by the signal output end of the pressure sensor (10), runs straight for a certain distance and then enters the winding layer (17), and winds spirally along the outer wall of the first deflection layer (15) until it passes out from the rear end outlet of the operation section (7) and is connected with the pressure display device.
5. A double-lumen microcatheter with a blood vessel pressure measurement function according to claim 4, characterized in that, A second deflection layer (18) is further provided on the outer circle of the winding layer (17) and the first deflection layer (15) outside the first guide wire lumen (2), and a second braided mesh (19) is arranged in the second deflection layer (18).
6. A double-lumen microcatheter with a vascular pressure measurement function according to claim 1, characterized in that, The double-lumen microcatheter body (1) is tapered from the front end of the double-lumen tube section (6) to the top of the insertion section (4).
7. A double-lumen microcatheter with a blood vessel pressure measurement function according to claim 5, characterized in that, The braiding density of the second braided mesh (19) is less than that of the first braided mesh (16); The thickness of the second braided mesh (19) is greater than that of the first braided mesh (16).
8. The dual-lumen microcatheter with a blood vessel pressure measurement function according to claim 7, characterized in that, The first braided mesh (16) and the second braided mesh (19) are woven from wires made of stainless steel.
9. A double-lumen microcatheter with a blood vessel pressure measurement function according to claim 1, characterized in that, The developing ring (8) is provided at a position 1 mm from the top end of the insertion section (4), and the distance between the pressure sensor (10) and the developing ring (8) is 3 mm; the widths of the developing ring (8) and the developing block (12) are 1 mm.
10. The double-lumen microcatheter with a blood vessel pressure measurement function according to claim 1, wherein After the branch guide wire (14) extending from the outlet of the second guide wire cavity (3) is lifted by the left side of the arc-shaped notch above the front end of the double-lumen tube body section (6), the included angle U between the pushing direction of the branch guide wire (14) and the horizontal direction is ≥5°.