Intravascular pressure detection catheter

Abstract

The invention relates to an intravascular pressure detection catheter which comprises a catheter body and a handle connected to one end of the catheter body, a functional cavity and a detection cavity are formed in the catheter body in the long axis direction of the catheter body, a blood pressure detection device is installed in the detection cavity, and a detection part of the blood pressure detection device is located in a port of the end, away from the handle, of the detection cavity or located outside the port. A self-expansion supporting part is arranged in the functional cavity, the handle is provided with a pushing structure which extends into the functional cavity and is connected with the self-expansion supporting part, and the pushing structure is used for pushing the self-expansion supporting part out of the port, away from the handle, of the functional cavity so that the self-expansion supporting part can be released and expanded or withdrawn into the functional cavity; and meanwhile, the self-expansion support part is positioned in the released and expanded self-expansion support part. The blood pressure detection device has the advantages of being reasonable in structural design and capable of making contact with the inner wall of the blood vessel after being released by arranging the self-expansion supporting part, preventing the position where the blood pressure detection device is located from making contact with the blood vessel and ensuring the blood vessel internal pressure detection accuracy of the blood pressure detection device.

Description

Technical Field

[0001] The invention relates to the technical field of medical equipment, and in particular to an intravascular pressure detection catheter. Background Art

[0002] Coronary artery blood flow reserve (Fractional Flow Reserve, FFR) refers to the ratio of the maximum blood flow that can be obtained in the myocardial area supplied by the blood vessel to the maximum blood flow that can be obtained in the same area under normal conditions in theory when there is a stenotic lesion in the coronary artery. It has now become an invasive functional evaluation indicator and has important guiding significance for the treatment strategy of coronary heart disease. In medicine, FFR is widely used to accurately diagnose functional myocardial ischemia in coronary heart disease and help doctors determine whether there is a stenotic lesion and whether a heart stent implantation (PCI: Percutaneous Coronary Intervention) is needed. At the same time, it can also be used for the evaluation of the efficacy after stent implantation. FFR can accurately reflect the severity of lesion stenosis, help doctors more objectively select the indications for interventional treatment, guide the optimization of stent implantation, and determine the treatment effect and long-term efficacy. For example, when FFR is less than 0.7-0.8, critical coronary lesions should be considered for stent implantation or coronary artery bypass surgery. Therefore, by measuring FFR, it can help doctors make accurate judgments and avoid excessive treatment caused by doctors' misjudgment.

[0003] At present, most pressure sensing catheters with rapid exchange (RX) ports are used, and the distal part of the catheter has an inner cavity for passing the guide wire. By putting the distal part on the guide wire, the pressure sensing catheter can be moved to a predetermined position along the guide wire. Before coronary intervention, the pressure sensing catheter is passed through the distal side and the proximal side (right side) of the stenosis, and the distal blood pressure and the proximal blood pressure are recorded respectively, and the FFR value is calculated.

[0004] However, the installation of the pressure sensor often causes a bulge in the local area of ​​the pressure sensing catheter (where the pressure sensor is located); when the pressure sensing catheter is inside a blood vessel, the pressure sensor may abut against the blood vessel wall, thus affecting the pressure measurement of the pressure sensor, making it impossible to obtain an accurate FFR value and providing doctors with an accurate basis for judgment.

[0005] Based on this, it is necessary to develop an intravascular pressure detection catheter to overcome the above technical problems. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a catheter for detecting intravascular pressure, which effectively overcomes the defects of the prior art.

[0007] The technical solution of the present invention to solve the above technical problems is as follows:

[0008] A catheter for detecting intravascular pressure comprises a catheter body and a handle connected to one end of the catheter body, wherein a functional cavity and a detection cavity are arranged in the catheter body along its long axis direction, wherein a blood pressure detection device is arranged in the detection cavity, wherein the detection part of the blood pressure detection device is located in a port at one end of the detection cavity away from the handle, or is located outside the port, wherein a self-expanding support part is arranged in the functional cavity, wherein the handle is provided with a pushing structure extending into the functional cavity and connected to the self-expanding support part, wherein the pushing structure is used for pushing the self-expanding support part out of the port of the functional cavity away from the handle to release and expand it, or for retracting it into the functional cavity, and when the blood pressure detection device is located outside the port, it is simultaneously located inside the self-expanding support part after the release and expansion.

[0009] Based on the above technical solution, the present invention can also be improved as follows.

[0010] Furthermore, the above-mentioned blood pressure detection device is a pressure detection sensor.

[0011] The blood pressure detection device is an optical fiber pressure sensor. A cable tube is provided at one end of the handle away from the catheter body. The optical fiber pressure sensor passes through the handle and extends into the cable tube.

[0012] Furthermore, the self-expanding support portion includes a releasable and expandable support body and a first traction wire, one end of the first traction wire is connected to the support body, and the other end of the first traction wire is connected to the pushing structure. The support body is an elastic wire strip, which is a pig tail shape or a spiral shape after being released.

[0013] Furthermore, the self-expanding support portion includes a mesh support and a second traction wire. The mesh support is cone-shaped or spindle-shaped after being released, and the other end of the second traction wire is connected to the pushing structure.

[0014] Furthermore, the self-expanding support portion includes a plurality of elastic wires and a third traction wire, the two ends of the plurality of elastic wires are respectively gathered and riveted, one end of the third traction wire is connected to one end of the plurality of elastic wires, the plurality of elastic wires are distributed at intervals along the circumferential direction, and after being released and expanded, they are in a circular arc shape convex outward, and the other end of the third traction wire is connected to the pushing structure.

[0015] Furthermore, the pushing structure includes a pushing button, a slide groove is provided on the handle, the pushing button is slidably installed in the slide groove, the inner side of which extends into the handle and is connected to a pushing rod, the pushing rod extends into the functional cavity and is connected to the self-expanding support part.

[0016] Furthermore, there are two detection cavities, and a groove is recessed on the outer surface of the other end of the catheter body corresponding to a portion of the detection cavities, the groove extends along the long axis direction of the catheter body, one end of one of the detection cavities away from the handle is connected to the groove, and the blood pressure detection device is arranged in the port of one of the detection cavities.

[0017] Furthermore, the blood pressure detection device in one of the detection cavities can move along the long axis direction of the catheter body.

[0018] Furthermore, a guidewire cavity is provided in the catheter body along its long axis direction, and a guidewire inlet communicating with the guidewire cavity is provided on the side wall surface of the catheter body close to the other end thereof.

[0019] The beneficial effects of the present invention are: reasonable structural design, by providing a self-expanding support portion, it can achieve contact with the inner wall of the blood vessel after release, thereby avoiding contact between the part where the blood pressure detection device is located and the blood vessel, ensuring the accuracy of the blood pressure detection device in detecting the intravascular pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the intravascular pressure detection catheter of the present invention;

[0021] Figure 2 It is a structural cross-sectional view of the intravascular pressure detection catheter of the present invention along the long axis direction;

[0022] Figure 3 It is a structural elevation view of the intravascular pressure detection catheter of the present invention;

[0023] Figure 4 for Figure 1 Structural cross-section view of the middle AA surface;

[0024] Figure 5 for Figure 1 Structural cross-section view of the middle BB surface;

[0025] Figure 6 for Figure 3 The structure of the middle C part is enlarged;

[0026] Figure 7 It is a structural schematic diagram of another embodiment of the self-expanding support portion in the intravascular pressure detection catheter of the present invention;

[0027] Figure 8 It is a structural schematic diagram of another embodiment of the self-expanding support portion in the intravascular pressure detection catheter of the present invention.

[0028] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0029] 1. Catheter body; 2. Handle; 3. Blood pressure detection device; 4. Self-expanding support part; 11. Guidewire cavity; 12. Functional cavity; 13. Detection cavity; 41. Support body; 42. Mesh bracket; 43. Elastic wire; 51. Push button; 131. Groove. DETAILED DESCRIPTION

[0030] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0031] Example

[0032] like Figure 1 , 2 As shown in Figures 3 and 4, the intravascular pressure detection catheter of this embodiment includes a catheter body 1 and a handle 2 connected to one end of the catheter body 1. The catheter body 1 is provided with a functional cavity 12 and a detection cavity 13 along its long axis direction. The detection cavity 13 is provided with a blood pressure detection device 3. The detection part of the blood pressure detection device 3 is located in a port at one end of the detection cavity 13 away from the handle 2, or is located outside the port. The functional cavity 12 is provided with a self-expanding support part 4. The handle 2 is provided with a pushing structure extending into the functional cavity 12 and connected to the self-expanding support part 4. The pushing structure is used to push the self-expanding support part 4 out of the port of the functional cavity 12 away from the handle 2 to release and expand it, or to retract it into the functional cavity 12. When the blood pressure detection device 3 is located outside the port, it is simultaneously located inside the self-expanding support part 4 after the expansion is released.

[0033] When the intravascular pressure detection catheter of this embodiment is used, it enters the target position in the patient's body along the blood vessel in an interventional manner, and then the self-expanding support part 4 compressed in the functional cavity 12 is pushed out of the end away from the handle 2 through the pushing structure, and the self-expanding support part 4 is released and expanded outside the port of the catheter body 1 to contact the blood vessel wall. The cross-sectional size after release is larger than the cross-sectional size of the catheter body 1, and the catheter body 1 is located at a non-edge position of the self-expanding support part 4 after release in the long-axis projection, so that the position where the blood pressure detection device 3 is provided on the catheter body 1 can be prevented from contacting the inner wall of the blood vessel, thereby ensuring the accuracy of the blood pressure detection device 3 in detecting the intravascular pressure.

[0034] It should be supplemented that the intravascular pressure detection catheter of this embodiment is generally left in the patient's body for a short period of time, with the handle 2 part located outside the body for short-term effective monitoring.

[0035] In this embodiment, the blood pressure detection device 3 adopts a medical pressure detection sensor.

[0036] Specifically, the blood pressure detection device 3 is an optical fiber pressure sensor, and a cable tube is provided at one end of the handle 2 away from the catheter body 1, and the optical fiber pressure sensor passes through the handle 2 and extends into the cable tube. The detection end of the optical fiber pressure sensor extends into the detection cavity 13, or extends outside the port, and the tail end passes through the cable tube and is connected to a connector (electrical connector, etc.) connected to the host system (or related instruments), so that data can be transmitted to the host system.

[0037] In this embodiment, the self-expanding support portion 4 includes at least the following structural forms:

[0038] 1) The self-expanding support part 4 comprises a releasable and expandable support body 41 and a first traction wire, one end of the first traction wire is connected to the support body 41, and the other end of the first traction wire is connected to the pushing structure. The support body 41 is an elastic wire strip, which is a pigtail shape or a spiral shape (such as Figure 6 When the support body 41 is contracted in the functional cavity 12, it is almost in a straight strip shape, and after being pushed out of the functional cavity 12, it is quickly released into a pig tail shape or a spiral shape.

[0039] 2) The self-expanding support part 4 includes a mesh support 42 and a second traction wire. The mesh support 42 is cone-shaped (such as Figure 7 The second traction wire is shaped like a spindle or a trumpet, and the other end of the second traction wire is connected to the pushing structure. The self-expanding support part 4 adopts a mesh stent 42 woven with silk threads, which is released after being pushed out of the functional cavity 12, can have good contact with the inner wall of the blood vessel, and its cross-sectional area is larger than the cross-sectional area of ​​the catheter body 1. Taking the mesh stent 42 as a cone as an example, after release, the cross-sectional size of the mesh stent 42 gradually increases in the direction away from the catheter body 1. Of course, the mesh stent 42 can also be designed to expand into a spherical or ellipsoidal shape after release.

[0040] 3) If Figure 8 As shown, the self-expanding support part 4 includes multiple elastic wires 43 and a third traction wire, the two ends of the multiple elastic wires 43 are respectively gathered and riveted, one end of the third traction wire is connected to one end of the multiple elastic wires 43, the multiple elastic wires 43 are distributed at intervals along the circumference, and after release and expansion, they are in an arc shape protruding outward, and the other end of the third traction wire is connected to the pushing structure. The self-expanding support part 4 is made of multiple elastic wires 43 (which can be nickel-titanium alloy wires), and the shape after release can be a jujube-shaped shape, which effectively contacts the inner wall of the blood vessel. After the elastic wire 43 is separated from the functional cavity 12, it bulges (arches) outward and deforms.

[0041] As a preferred embodiment, the pushing structure includes a pushing button 51, and a slide groove is provided on the handle 2. The push button 51 is slidably installed in the slide groove, and its inner side extends into the handle 2 and is connected to a pushing rod. The pushing rod extends into the functional cavity 12 and is connected to the self-expanding support part 4.

[0042] In the above embodiment, by pushing the push button 51 toward both ends of the lower handle 2, the self-expanding support part 4 can be pulled by the push rod, so that the self-expanding support part 4 extends out of the port of the functional cavity 12 for release, or retracts into the functional cavity 12, which is relatively simple and quick to operate.

[0043] As a preferred embodiment, Figure 4 , 5 As shown in Figures 6, two detection cavities 13 are provided, and a groove 131 is provided on the outer surface of the other end of the catheter body 1 at a position corresponding to one of the detection cavities 13, and the groove 131 extends along the long axis direction of the catheter body 1, and one end of one of the detection cavities 13 away from the handle 2 is connected with the groove 131, and the blood pressure detection device 3 is provided in the port of one of the detection cavities 13.

[0044] In the above embodiment, two blood pressure detection devices 3 are spaced apart in the long axis direction of the catheter body 1, so as to detect the coronary artery blood flow reserve fraction (FFR). Among them, the port of one detection cavity 13 is connected to the groove 131. The two blood pressure detection devices 3 at different positions are respectively used to detect the distal side and the proximal side of the stenosis of the corresponding blood vessel, so as to detect and calculate the FFR value.

[0045] In this embodiment, the blood pressure detection device 3 in one of the detection cavities 13 can move along the long axis direction of the catheter body 1. Taking the blood pressure detection device 3 as an optical fiber pressure sensor as an example, the tail end of the optical fiber pressure sensor can be pulled to adjust the displacement of the detection end of the blood pressure detection device 3, so that the detection end of the blood pressure detection device 3 located in one of the detection cavities 13 can move along the groove 131, and the distance between the blood pressure detection devices 3 in the two detection cavities 13 is adjusted to match different detection environments.

[0046] As a preferred embodiment, a guidewire cavity 11 is provided in the catheter body 1 along its long axis direction, and a guidewire inlet communicating with the guidewire cavity 11 is provided on the side wall surface of the catheter body 1 near the other end thereof.

[0047] In the above embodiment, the guidewire inlet can be used as a rapid guidewire exchange port of a conventional catheter, so that the entire catheter can enter the target position in the blood vessel along the guidewire D.

[0048] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0049] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0050] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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 an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0051] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0052] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0053] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A catheter for detecting intravascular pressure, characterized in that: The invention comprises a catheter body (1) and a handle (2) connected to one end of the catheter body (1); a functional cavity (12) and a detection cavity (13) are provided in the catheter body (1) along its long axis direction; a blood pressure detection device (3) is installed in the detection cavity (13); the detection part of the blood pressure detection device (3) is located in a port at one end of the detection cavity (13) away from the handle (2), or is located outside the port; a self-expanding support part (4) is installed in the functional cavity (12); the handle (2) is provided with a pushing structure extending into the functional cavity (12) and connected to the self-expanding support part (4); the pushing structure is used to push the self-expanding support part (4) out of the port of the functional cavity (12) away from the handle (2) to release and expand it, or to retract it into the functional cavity (12); and when the blood pressure detection device (3) is located outside the port, it is simultaneously located inside the self-expanding support part (4) after the release and expansion.

2. The intravascular pressure detection catheter according to claim 1, characterized in that: The blood pressure detection device (3) is a pressure detection sensor.

3. The intravascular pressure detection catheter according to claim 2, characterized in that: The blood pressure detection device (3) is an optical fiber pressure sensor. A cable tube is provided at one end of the handle (2) away from the catheter body (1). The optical fiber pressure sensor passes through the handle (2) and extends into the cable tube.

4. The intravascular pressure detection catheter according to claim 1, characterized in that: The self-expanding support part (4) comprises a releasable and expandable support body (41) and a first traction wire, one end of the first traction wire is connected to the support body (41), and the other end of the first traction wire is connected to the pushing structure, and the support body (41) is an elastic wire strip, which is a pig tail shape or a spiral shape after being released.

5. The intravascular pressure detection catheter according to claim 1, characterized in that: The self-expanding support part (4) comprises a mesh support (42) and a second traction wire. The mesh support (42) is cone-shaped or spindle-shaped after being released, and the other end of the second traction wire is connected to the pushing structure.

6. The intravascular pressure detection catheter according to claim 1, characterized in that: The self-expanding support portion (4) comprises a plurality of elastic wires (43) and a third traction wire, the two ends of the plurality of elastic wires (43) are respectively gathered and riveted, one end of the third traction wire is connected to one end of the plurality of elastic wires (43), the plurality of elastic wires (43) are distributed at intervals along the circumferential direction, and after being released and expanded, they are in the shape of an arc convex outward, and the other end of the third traction wire is connected to the pushing structure.

7. The intravascular pressure detection catheter according to claim 1, characterized in that: The pushing structure comprises a pushing button (51), and a slide groove is provided on the handle (2). The pushing button (51) is slidably mounted in the slide groove, and its inner side extends into the handle (2) and is connected to a pushing rod. The pushing rod extends into the functional cavity (12) and is connected to the self-expanding support part (4).

8. The intravascular pressure detection catheter according to any one of claims 1 to 7, characterized in that: Two detection cavities (13) are provided, and a groove (131) is provided on the outer surface of the other end of the catheter body (1) at a position corresponding to one of the detection cavities (13), and the groove (131) extends along the long axis direction of the catheter body (1), and one end of one of the detection cavities (13) away from the handle (2) is connected to the groove (131), and the blood pressure detection device (3) is provided in the port of one of the detection cavities (13).

9. The intravascular pressure detection catheter according to claim 8, characterized in that: The blood pressure detection device (3) in one of the detection cavities (13) is movable along the long axis direction of the catheter body (1).

10. The intravascular pressure detection catheter according to any one of claims 1 to 7, characterized in that: A guidewire cavity (11) is provided inside the catheter body (1) along its long axis direction, and a guidewire inlet communicating with the guidewire cavity (11) is provided on the side wall surface of the catheter body (1) close to the other end thereof.

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