A distal access catheter

Abstract

The utility model discloses a kind of remote access catheter, including guide catheter, the proximal end of guide catheter is connected with connector, guide catheter is sequentially provided with proximal end developing ring, midsection developing ring and distal end developing ring from near to far, flow sensor for real-time detection blood flow rate or detection liquid medicine conveying speed is provided at the distal end of guide catheter, the flow sensor is electrically connected with external control device by wire connection.This structure is embedded developing ring in guide catheter distal end, midsection and proximal end respectively, realize sectional developing function, provide comprehensive catheter position information, help doctor more accurately control catheter, while additionally flow sensor can real-time detect blood flow rate or detect liquid medicine conveying speed, it is convenient to make corresponding adjustment and response in time according to change.

Description

Technical Field

[0001] This utility model relates to the technical field of medical devices for neurointerventional surgery, specifically a distal access catheter suitable for procedures such as cerebrovascular interventional therapy, aneurysm embolization, and thrombus removal. It can provide doctors with clearer catheter location information, improving the safety and precision of the surgery. Background Technology

[0002] In recent years, endovascular interventional medical catheters have become the mainstream treatment method for arterial diseases due to their minimal invasiveness, fewer complications, and faster postoperative recovery. During the procedure, the access catheter provides a path and support for microcatheters and other devices, and is compatible with the manipulation of various materials to reach the target blood vessel location.

[0003] Currently, medical catheters on the market typically employ a single radiopaque loop design, limiting radiopaque areas to the distal end of the catheter, such as the distal access catheter disclosed in patent application number 201922393327.0. This design has the following drawbacks:

[0004] 1. Insufficient imaging information: It can only show the position of the distal end of the catheter, and cannot provide the position information of the middle or proximal end of the catheter, making it difficult for doctors to judge the overall direction and curvature of the catheter during surgery.

[0005] 2. High operational risk: Due to the lack of multi-segment imaging function, the travel path of the catheter in the blood vessel is unclear, which can easily cause vascular damage or perforation.

[0006] 3. Poor adaptability: A single imaging design cannot meet the needs of complex vascular anatomy, especially in tortuous vessels, where catheter positioning and adjustment are difficult. Utility Model Content

[0007] The purpose of this invention is to provide a distal access catheter to solve the problems mentioned in the background art, such as insufficient detection and imaging information and poor applicability of existing catheters.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a distal access catheter, comprising a guiding tube, wherein a connector is connected to the proximal end of the guiding tube, and the guiding tube is provided with a proximal imaging ring, a mid-section imaging ring and a distal imaging ring in sequence from proximal to distal. A flow sensor for real-time detection of blood flow rate or drug delivery rate is provided at the distal end of the guiding tube, and the flow sensor is electrically connected to an external control device via a wire.

[0009] Preferably, the guide tube includes an outer tube and an inner tube, and a spiral stress strip extending along the length of the outer tube is provided between the outer tube and the inner tube. The proximal developing ring, the middle developing ring and the distal developing ring are fixed to the outer wall of the outer tube by hot pressing or bonding. The wire is embedded in the interior of the outer tube and extends along the length of the outer tube. One end of the wire is electrically connected to the flow sensor, and the other end of the wire extends out of the connector and is connected to an external control device.

[0010] Preferably, the spiral stress bar is made of nickel-titanium alloy wire.

[0011] Preferably, the connector includes a conduit connector seat and a stress buffer. The conduit connector seat is located at the proximal end of the guide tube, and the stress buffer is connected between the proximal end of the guide tube and the conduit connector seat. The conduit connector seat has handles on both sides.

[0012] Preferably, the guide tube is made of medical flexible material.

[0013] Preferably, the guide tube has a distal end, a middle section, and a proximal end. The diameter of the distal end is smaller than the diameter of the middle section, and the diameter of the middle section is smaller than the diameter of the proximal end. A first trapezoidal connecting portion connects the distal end and the middle section, and a second trapezoidal connecting portion connects the middle section and the proximal end. The proximal developing ring is located inside the proximal end, the middle developing ring is located in the middle section, and the distal developing ring is located at the distal end.

[0014] Preferably, for easy disassembly and replacement of the entire conduit, the flow sensor can be reused. Furthermore, a female connector is provided at the far end of the wire near the outer tube, and the output end of the flow sensor is soldered with a pin that is electrically connected to the female connector. The pin and the female connector can be detachably installed.

[0015] Preferably, to improve sealing and further enhance the fixation of the flow sensor, the outer wall of the plug-in female is provided with a waterproof transparent sealing sleeve, the other end of which is fitted onto the outer wall of the flow sensor, and the waterproof transparent sealing sleeve is fixed to the inner wall of the outer tube.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] 1. Contrast rings are embedded at the distal, middle, and proximal ends of the guiding catheter to achieve segmented contrast enhancement, providing comprehensive catheter position information and helping doctors control the catheter more precisely;

[0018] 2. Improve surgical safety: Multi-segment imaging reduces the risk of catheter misoperation and avoids vascular perforation or damage.

[0019] 3. Enhanced adaptability: Applicable to various complex vascular anatomy structures, especially suitable for small and tortuous blood vessels in neurointerventional surgery;

[0020] 4. Simple operation: The imaging information is clear, allowing doctors to more intuitively determine the catheter position and shorten the operation time;

[0021] 5. At the same time, this structure adds a flow sensor at the distal end of the guide tube, which can detect the flow rate of infusion or the speed of blood flow in real time. The flow sensor can detect the blood flow rate or the speed of drug delivery in real time, which can facilitate timely adjustment and response to changes. Attached Figure Description

[0022] Figure 1 This is a top view of a distal access catheter in Example 1;

[0023] Figure 2 for Figure 1 A cross-sectional schematic diagram of AA in the middle;

[0024] Figure 3 This is a partial structural reference diagram of the outer tube and the helical stress strip in Example 1;

[0025] Figure 4 for Figure 1 Enlarged view of a section at point B in the middle;

[0026] Figure 5 This is a schematic diagram of the internal structure of a distal access catheter in Example 1;

[0027] Figure 6 for Figure 5 Enlarged view of a section at point C;

[0028] Figure 7 This is a schematic diagram of the guiding tube structure in Embodiment 2;

[0029] Figure 8 This is a schematic diagram of the flow sensor and some of the wires in Example 3.

[0030] In the diagram: 1. Guide tube; 2. Connector; 201. Guide tube connector; 202. Stress buffer; 3. Proximal imaging ring; 4. Mid-section imaging ring; 5. Distal imaging ring; 101. Outer tube; 102. Inner tube; 103. Spiral stress strip; 104. Intermediate layer; 104. Plug-in female connector; 105. Plug-in pin; 106. Distal end; 107. Mid-section; 108. Waterproof transparent sealing sleeve; 109. Proximal end; 110. First trapezoidal connection; 111. Second trapezoidal connection; 6. Flow sensor; 7. Wire. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0032] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0033] Example 1

[0034] Please see Figures 1-6 As shown, this embodiment discloses a distal access catheter, including a guide tube 1. The proximal end of the guide tube 1 is connected to a connector 2. The guide tube 1 is provided with a proximal imaging ring 3, a mid-section imaging ring 4 and a distal imaging ring 5 in sequence from proximal to distal. A flow sensor 6 is provided at the distal end of the guide tube 1 for real-time detection of blood flow rate or drug delivery rate. The flow sensor 6 is electrically connected to an external control device through a wire 7.

[0035] Preferably, the guiding tube 1 includes an outer tube 101 and an inner tube 102. A spiral stress strip 103 extending along the length of the outer tube 101 is provided between the outer tube 101 and the inner tube 102. The proximal imaging ring 3, the middle imaging ring 4, and the distal imaging ring 5 are fixed to the outer wall of the outer tube 101 by hot pressing or bonding. The wire 7 is embedded in the interior of the outer tube 101 and extends along the length of the outer tube 101. One end of the wire 7 is electrically connected to the flow sensor 6, and the other end of the wire 7 extends out of the connector 2 and is connected to an external control device. In this structure, the wire 7 is embedded in the guiding tube 1, and the other end of the wire extends out of the connector 2 and is connected to the external control device to transmit signals to the control device. How the control device is electrically connected to the wire 7 and obtains the data information transmitted by the flow sensor 6 is conventional technology in the field and will not be described in detail. The application of the flow sensor 6 in the hospital field is existing technology, so the model used is conventional technology in the field and will not be described in detail.

[0036] Preferably, the spiral stress strip 103 is made of nickel-titanium alloy wire. By adding the spiral stress strip 112, the overall hardness of the catheter can be improved, thereby achieving the anti-kink properties of the entire catheter.

[0037] Preferably, the connector 2 includes a conduit connector 201 and a stress buffer 202. The conduit connector 201 is disposed at the proximal end of the guide tube 1. The stress buffer 202 is connected between the proximal end of the guide tube 1 and the conduit connector 201. Handles 203 are provided on both sides of the conduit connector 201 to facilitate hand gripping of the head.

[0038] The guide tube 1 in this structure is an integral structure with a hollow inner cavity. This structure primarily employs a multi-segment developing ring system, consisting of a proximal developing ring 3, a mid-section developing ring 4, and a distal developing ring 5, which are respectively embedded in the distal, mid, and proximal ends of the guide tube 1 and fixed to it via heat pressing or adhesive bonding. Furthermore, the proximal connector 2 can be connected to the guide tube 1 later via a threaded or snap-fit ​​structure, facilitating user operation. This structure offers the following technical advantages:

[0039] 1. Contrast rings are embedded at the distal, middle and proximal ends of the guiding catheter 1 to achieve segmented contrast enhancement, provide comprehensive catheter position information, and help doctors control the catheter more precisely;

[0040] 2. Improve surgical safety: Multi-segment imaging reduces the risk of catheter misoperation and avoids vascular perforation or damage.

[0041] 3. Enhanced adaptability: Applicable to various complex vascular anatomy structures, especially suitable for small and tortuous blood vessels in neurointerventional surgery;

[0042] 4. Simple operation: The imaging information is clear, allowing doctors to more intuitively determine the catheter position and shorten the operation time;

[0043] 5. At the same time, this structure adds a flow sensor 6 at the distal end of the guide tube 1, which can detect the flow rate of infusion or the speed of blood flow in real time. The flow sensor 6 can detect the blood flow rate or the speed of drug delivery in real time, so as to make timely adjustments and responses according to changes.

[0044] The working principle of this structure is as follows: the catheter is guided into the target blood vessel through the guide wire, and the position and direction of the catheter are clearly displayed under X-ray by multiple contrast rings; the doctor can adjust the catheter's path in real time by observing the position of the contrast rings to ensure that the catheter accurately reaches the target area. At the same time, a flow sensor 6 is added to the distal end of the guiding tube 1 to detect the infusion flow rate or blood flow velocity in real time. The flow sensor 6 can be used to detect the blood flow velocity or the drug delivery speed in real time.

[0045] Example 2

[0046] Please see Figure 7As shown in this embodiment, a distal access catheter is disclosed. Preferably, the guide tube 1 has a distal end 106, a mid-section 107, and a proximal end 109. The diameter of the distal end 106 is smaller than the diameter of the mid-section 107, and the diameter of the mid-section 107 is smaller than the diameter of the proximal end 109. A first trapezoidal connecting portion 110 connects the distal end 106 and the mid-section 107, and a second trapezoidal connecting portion 111 connects the mid-section 107 and the proximal end 109. The proximal imaging ring 3 is placed inside the proximal end 109, the mid-section imaging ring 4 is placed in the mid-section 107, and the distal imaging ring 5 is placed in the distal end 106. Preferably, the guide tube 1 is made of a medical flexible material. The guide tube 1 is made of a non-toxic and harmless medical flexible material, which can adapt to the tortuous anatomical structure of complex blood vessels and reduce the risk of vascular injury.

[0047] Example 3

[0048] Please see Figure 8 As shown in this embodiment, a distal access conduit is preferably provided. For ease of disassembly and replacement of the entire conduit, the flow sensor 6 can be reused. A female connector 104 is provided at the distal end of the wire 7 near the outer tube 101. A connector pin 105, electrically connected to the female connector 104, is soldered to the output end of the flow sensor 6. The connector pin 105 is detachably installed from the female connector 104. A waterproof transparent sealing sleeve 108 is provided on the outer wall of the female connector 104. The other end of the waterproof transparent sealing sleeve 108 is fitted onto the outer wall of the flow sensor 6. The wire 7 is fixed to the inner wall of the outer tube 101, and the flow sensor 6 is detachably connected. If the flow sensor 6 fails, it can be replaced. Moreover, the flow sensor 6 can be reused after sterilization. In addition, by adding a waterproof transparent sealing sleeve 108, part of which is set outside the plug-in female 104 and fixedly connected to the plug-in female 104, and the other part is fitted outside the flow sensor 6, the friction between the inner wall of the waterproof transparent sealing sleeve 108 and the outer wall of the flow sensor 6 is increased after the flow sensor 6 and the wire 7 are plugged in, which further improves the fixing effect of the flow sensor 6 and prevents it from falling off during use.

[0049] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A distal access catheter, comprising a guiding tube (1), wherein a connector (2) is connected to the proximal end of the guiding tube (1), characterized in that: The guiding tube (1) is provided with a proximal imaging ring (3), a middle imaging ring (4) and a distal imaging ring (5) in sequence from near to far. A flow sensor (6) for real-time detection of blood flow rate or drug delivery speed is provided at the distal end of the guiding tube (1). The flow sensor (6) is electrically connected to an external control device through a wire (7).

2. The distal access catheter according to claim 1, characterized in that: The guide tube (1) includes an outer tube (101) and an inner tube (102). A spiral stress strip (103) extending along the length of the outer tube (101) is provided between the outer tube (101) and the inner tube (102). The proximal developing ring (3), the middle developing ring (4) and the distal developing ring (5) are fixed to the outer wall of the outer tube (101) by hot pressing or bonding. The wire (7) is embedded in the interior of the outer tube (101) and extends along the length of the outer tube (101). One end of the wire (7) is electrically connected to the flow sensor (6), and the other end of the wire (7) extends out of the connector (2) and is connected to the external control device.

3. A distal access catheter according to claim 2, characterized in that: The spiral stress bar (103) is a nickel-titanium alloy wire.

4. A distal access catheter according to claim 2, characterized in that: The connector (2) includes a conduit connector (201) and a stress buffer (202). The conduit connector (201) is located at the proximal end of the guide tube (1). The stress buffer (202) is connected between the proximal end of the guide tube (1) and the conduit connector (201). Handles (203) are provided on both sides of the conduit connector (201).

5. A distal access catheter according to claim 1, characterized in that: The guide tube (1) is made of medical flexible material.

6. A distal access catheter according to claim 2 or 3, characterized in that: The guide tube (1) has a rod body comprising a distal end (106), a middle section (107), and a proximal end (109). The diameter of the distal end (106) is smaller than the diameter of the middle section (107), and the diameter of the middle section (107) is smaller than the diameter of the proximal end (109). A first trapezoidal connecting part (110) connects the distal end (106) and the middle section (107), and a second trapezoidal connecting part (111) connects the middle section (107) and the proximal end (109). The proximal imaging ring (3) is placed inside the proximal end (109), the middle imaging ring (4) is placed in the middle section (107), and the distal imaging ring (5) is placed in the distal end (106).

7. A distal access catheter according to claim 2, characterized in that: The conductor (7) is provided with a plug-in female socket (104) at the far end near the outer tube (101). The output end of the flow sensor (6) is welded with a plug-in pin (105) that is electrically connected to the plug-in female socket (104). The plug-in pin (105) is detachably installed from the plug-in female socket (104).

8. A distal access catheter according to claim 7, characterized in that: The outer wall of the plug-in female (104) is provided with a waterproof transparent sealing sleeve (108). The other end of the waterproof transparent sealing sleeve (108) is fitted onto the outer wall of the flow sensor (6), and the waterproof transparent sealing sleeve (108) is fixed to the inner wall of the outer tube (101).

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