Doppler probe for measuring flow in blood vessel

Abstract

The invention provides a Doppler probe for intravascular flow measurement. The Doppler probe comprises a T-shaped probe support composed of a transverse extension part and a vertical extension part; wherein a first linear array probe is arranged on the transverse extension part, and a second linear array probe is arranged on the vertical extension part; during use, the transverse extension part is arranged perpendicular to a blood vessel so as to detect the diameter of the blood vessel through the first linear array probe of the transverse extension part, and the vertical extension part is arranged at the center of the blood vessel in the extension direction of the blood vessel so as to detect the included angle between the vertical extension part and the extension direction of the blood vessel through the second linear array probe of the vertical extension part.

Description

Technical Field

[0001] The invention relates to the technical field of medical devices, and in particular to a Doppler probe for measuring intravascular flow. Background Art

[0002] In the medical field, Doppler probes are generally used to evaluate arterial hemodynamics through the ultrasonic Doppler effect.

[0003] For intravascular flow measurement, it is necessary to know the diameter and flow velocity of the blood vessel, so that the formula "flow = flow velocity * area" can be used to obtain the desired result. Therefore, in order to reduce errors, the flow velocity measurement needs to be as accurate as possible, and the true flow velocity of parallel blood vessels needs to be collected.

[0004] However, in the prior art, there is no technical solution that can obtain the real flow velocity of parallel blood vessels with particular accuracy. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a Doppler probe for intravascular flow measurement in view of the above-mentioned defects in the prior art, which can obtain the real flow velocity of parallel blood vessels particularly accurately.

[0006] According to the present invention, a Doppler probe for measuring intravascular flow is provided, which is characterized by comprising: a T-shaped probe bracket consisting of a transverse extension portion and a vertical extension portion; wherein a first linear array probe is arranged on the transverse extension portion, and a second linear array probe is arranged on the vertical extension portion; when in use, the transverse extension portion is arranged perpendicular to the blood vessel so as to detect the diameter of the blood vessel using the first linear array probe of the transverse extension portion, and the vertical extension portion is arranged at a position at the center of the blood vessel along the extension direction of the blood vessel so as to detect the angle between the vertical extension portion and the extension direction of the blood vessel using the second linear array probe of the vertical extension portion.

[0007] Preferably, the first linear array probe and the second linear array probe have different operating frequencies.

[0008] Preferably, a Doppler probe is also arranged on the vertical extension part, and starts working to detect the blood flow velocity in the blood vessel after the second linear array probe detects the angle between the vertical extension part and the extension direction of the blood vessel; and the second linear array probe stops working after detecting the angle between the vertical extension part and the extension direction of the blood vessel.

[0009] Preferably, the pulse wave Doppler probe and the second linear array probe have different operating frequencies.

[0010] Preferably, the Doppler probe for intravascular flow measurement calculates the instantaneous flow Q using the following formula:

[0011] Q = V2*S2+S13*(V1+V3) / 2;

[0012] Among them, V1 is the effective flow velocity obtained by multiplying the flow velocity of the first sampling gate detected by the pulse wave Doppler probe by the cosine value of the angle between the vertical extension part and the extension direction of the blood vessel, V2 is the effective flow velocity obtained by multiplying the flow velocity of the second sampling gate detected by the pulse wave Doppler probe by the cosine value of the angle between the vertical extension part and the extension direction of the blood vessel, V3 is the effective flow velocity obtained by multiplying the flow velocity of the third sampling gate detected by the pulse wave Doppler probe by the cosine value of the angle between the vertical extension part and the extension direction of the blood vessel, S2 is the area of ​​the circular region where the second sampling gate is located, and S13 is the area of ​​the blood vessel after deducting S2.

[0013] According to the present invention, a Doppler probe for measuring intravascular flow is also provided, which is characterized in that it includes: a T-shaped probe bracket composed of a transverse extension part and a vertical extension part; wherein a first linear array probe is arranged on the transverse extension part, a mounting assembly is provided on the vertical extension part, and a second linear array probe and a Doppler probe are detachably arranged on the vertical extension part via the mounting assembly; when in use, the transverse extension part is arranged perpendicular to the blood vessel so as to use the first linear array probe of the transverse extension part to detect the diameter of the blood vessel, and the vertical extension part is arranged at a position at the center of the blood vessel along the extension direction of the blood vessel so as to use the second linear array probe of the vertical extension part to detect the angle between the vertical extension part and the extension direction of the blood vessel.

[0014] Preferably, the first linear array probe and the second linear array probe have different operating frequencies.

[0015] Preferably, the pulse wave Doppler probe and the second linear array probe have different operating frequencies.

[0016] Preferably, the Doppler probe for measuring intravascular flow rate calculates the instantaneous flow rate Q using the following formula:

[0017] Q = V2*S2+S13*(V1+V3) / 2;

[0018] Among them, V1 is the effective flow velocity obtained by multiplying the flow velocity of the first sampling gate detected by the pulse wave Doppler probe by the cosine value of the angle between the vertical extension part and the extension direction of the blood vessel, V2 is the effective flow velocity obtained by multiplying the flow velocity of the second sampling gate detected by the pulse wave Doppler probe by the cosine value of the angle between the vertical extension part and the extension direction of the blood vessel, V3 is the effective flow velocity obtained by multiplying the flow velocity of the third sampling gate detected by the pulse wave Doppler probe by the cosine value of the angle between the vertical extension part and the extension direction of the blood vessel, S2 is the area of ​​the circular region where the second sampling gate is located, and S13 is the area of ​​the blood vessel after deducting S2.

[0019] Preferably, the Doppler probe is used for measuring the blood flow of the internal carotid artery supplying blood to the brain. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] A more complete understanding of the present invention and its attendant advantages and features will be more readily appreciated by reference to the following detailed description taken in conjunction with the accompanying drawings, in which:

[0021] Figure 1 The overall schematic diagram of a Doppler probe for intravascular flow measurement according to a preferred embodiment of the present invention is schematically shown.

[0022] Figure 2 The figure schematically shows a Doppler probe for measuring intravascular flow rate according to a preferred embodiment of the present invention when in use.

[0023] Figure 3 The figure schematically shows a pulse wave Doppler probe sampling gate for intravascular flow measurement according to a preferred embodiment of the present invention.

[0024] It should be noted that the drawings are used to illustrate the present invention, rather than to limit the present invention. Note that the drawings showing the structures may not be drawn to scale. In addition, in the drawings, the same or similar elements are marked with the same or similar reference numerals. DETAILED DESCRIPTION

[0025] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0027] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0029] Figure 1 The overall schematic diagram of a Doppler probe for intravascular flow measurement according to a preferred embodiment of the present invention is schematically shown.

[0030] like Figure 1 As shown, the Doppler probe for intravascular flow measurement according to a preferred embodiment of the present invention includes a T-shaped probe bracket consisting of a transverse extension portion 10 and a vertical extension portion 20; wherein a first linear array probe is arranged on the transverse extension portion 10, and a second linear array probe is arranged on the vertical extension portion 20.

[0031] Therefore, if Figure 2 As shown, when in use, the transverse extension portion 10 is arranged perpendicular to the blood vessel so as to utilize the first linear array probe of the transverse extension portion 10 to detect the diameter of the blood vessel, and the vertical extension portion 20 is arranged at the center of the blood vessel along the extension direction of the blood vessel so as to utilize the second linear array probe of the vertical extension portion 20 to detect the angle between the vertical extension portion 20 and the extension direction of the blood vessel.

[0032] Preferably, the first linear array probe and the second linear array probe have different operating frequencies, thereby improving signal accuracy.

[0033] It can be seen that the T-type probe holder fixes two linear array probes. The first linear array probe is used to locate the carotid artery and guide the second linear array probe to detect the carotid artery (passing through the center of the blood vessel, the largest cross section). In this way, the angle between the carotid artery and the second linear array probe can be determined for accurate calculation of Doppler blood flow velocity. Since the T-type probe holder is designed vertically, after the second linear array probe is parallel to the carotid artery, the first linear array probe must be perpendicular to the blood vessel, and the center of the first linear array probe can be directly opposite to the center of the blood vessel.

[0034] The best solution for subsequent acquisition is to use two probes at the same time to obtain the blood vessel diameter and flow velocity at the same time and perform calculations in real time; the higher the frame rate, the more accurate the calculation. To this end, in a preferred embodiment, after the physical position is determined, the second linear array probe can be replaced by a pulsed wave Doppler probe.

[0035] Therefore, preferably, a Doppler probe is also arranged on the vertical extension part 20, and after the second linear array probe detects the angle between the vertical extension part 20 and the extension direction of the blood vessel, the Doppler probe starts working to detect the blood flow rate in the blood vessel. The second linear array probe stops working after detecting the angle between the vertical extension part 20 and the extension direction of the blood vessel.

[0036] Alternatively, the vertical extension portion 20 has a mounting assembly, so that the second linear array probe and the Doppler probe are detachably arranged on the vertical extension portion 20 via the mounting assembly. Thus, after the second linear array probe detects the angle between the vertical extension portion 20 and the extending direction of the blood vessel, the second linear array probe is removed from the vertical extension portion 20 and the Doppler probe is installed.

[0037] And further preferably, the pulse wave Doppler probe and the second linear array probe have different operating frequencies.

[0038] Therefore, replacing the linear array with a pulse wave Doppler probe can further improve the frame rate and reduce costs (most devices do not support two linear arrays working at the same time). In addition, the pulse wave Doppler probe can select a different operating frequency from the linear array, so that the two probes can work synchronously to maximize the frame rate. The first linear array probe can also reduce the sampling range to further improve the frame rate. Since the diameter of the blood vessels is constantly changing during the cardiac cycle, the first linear array probe must be monitored in real time.

[0039] In addition, if Figure 3 As shown in the figure, the pulse wave Doppler probe samples through the center line of the blood vessel. Since most blood vessels are round, the blood flow velocity distribution can be simplified according to laminar flow. The pulse wave Doppler probe uses a smaller sampling gate to obtain the laminar flow velocity distribution of blood flow more accurately. Then, the angle of the blood vessel obtained by the second linear array probe can be used to calculate the blood flow velocity in the blood vessel.

[0040] For example, Figure 3 As shown, the pulse wave Doppler probe has a second sampling gate 32 located at the center line of the blood vessel and a first sampling gate 31 and a third sampling gate 33 located at both sides of the second sampling gate 32 respectively.

[0041] Moreover, the Doppler probe for intravascular flow measurement according to the preferred embodiment of the present invention calculates the instantaneous flow Q using the following formula:

[0042] Q = V2*S2+S13*(V1+V3) / 2;

[0043] Among them, V1 is the effective flow velocity obtained by multiplying the flow velocity of the first sampling gate 31 detected by the pulse wave Doppler probe by the cosine value of the angle between the vertical extension part 20 and the extension direction of the blood vessel, V2 is the effective flow velocity obtained by multiplying the flow velocity of the second sampling gate 32 detected by the pulse wave Doppler probe by the cosine value of the angle between the vertical extension part 20 and the extension direction of the blood vessel, V3 is the effective flow velocity obtained by multiplying the flow velocity of the third sampling gate 33 detected by the pulse wave Doppler probe by the cosine value of the angle between the vertical extension part 20 and the extension direction of the blood vessel, S2 is the area of ​​the circular region where the second sampling gate 32 is located, and S13 is the area of ​​the blood vessel after deducting S2.

[0044] The instantaneous flow rate can be obtained by multiplying the blood vessel area and the blood flow velocity. The instantaneous flow rate is integrated over time to obtain the final blood flow rate.

[0045] As described above, the method and device for measuring blood flow in a blood vessel designed by the present invention, in a specific embodiment, takes the blood flow of the internal carotid artery (ICA) which is mainly used to supply blood to the brain as an example, but is not limited to the measurement of the carotid artery. For example, the present invention can also be used to measure the blood flow in the external carotid artery (ECA).

[0046] In addition, it should be noted that, unless otherwise specified, the terms "first", "second", "third", etc. in the specification are only used to distinguish the various components, elements, steps, etc. in the specification, and are not used to indicate the logical relationship or sequential relationship between the various components, elements, steps, etc.

[0047] It is to be understood that, although the present invention has been disclosed as a preferred embodiment, the above embodiment is not intended to limit the present invention. For any person skilled in the art, without departing from the scope of the technical solution of the present invention, the technical content disclosed above can be used to make many possible changes and modifications to the technical solution of the present invention, or modified into equivalent embodiments of equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of protection of the technical solution of the present invention.

Claims

1. A Doppler probe for measuring intravascular flow, characterized in that include: A T-shaped probe bracket consisting of a transverse extension portion and a vertical extension portion; wherein a first linear array probe is arranged on the transverse extension portion, and a second linear array probe is arranged on the vertical extension portion; when in use, the transverse extension portion is arranged perpendicular to the blood vessel so as to detect the diameter of the blood vessel using the first linear array probe of the transverse extension portion, and the vertical extension portion is arranged at a position at the center of the blood vessel along the extension direction of the blood vessel so as to detect the angle between the vertical extension portion and the extension direction of the blood vessel using the second linear array probe of the vertical extension portion.

2. The Doppler probe for intravascular flow measurement according to claim 1, characterized in that: The first linear array probe and the second linear array probe have different operating frequencies.

3. The Doppler probe for intravascular flow measurement according to claim 1 or 2, characterized in that: A Doppler probe is also arranged on the vertical extension part, and starts working to detect the blood flow rate in the blood vessel after the second linear array probe detects the angle between the vertical extension part and the extension direction of the blood vessel; and the second linear array probe stops working after detecting the angle between the vertical extension part and the extension direction of the blood vessel.

4. The Doppler probe for intravascular flow measurement according to claim 3, characterized in that: The pulse wave Doppler probe and the second linear array probe have different operating frequencies.

5. The Doppler probe for intravascular flow measurement according to claim 3, characterized in that: The Doppler probe used for intravascular flow measurement calculates the instantaneous flow Q using the following formula: Q = V2*S2+S13*(V1+V3) / 2; Among them, V1 is the effective flow velocity obtained by multiplying the flow velocity of the first sampling gate detected by the pulse wave Doppler probe by the cosine value of the angle between the vertical extension part and the extension direction of the blood vessel, V2 is the effective flow velocity obtained by multiplying the flow velocity of the second sampling gate detected by the pulse wave Doppler probe by the cosine value of the angle between the vertical extension part and the extension direction of the blood vessel, V3 is the effective flow velocity obtained by multiplying the flow velocity of the third sampling gate detected by the pulse wave Doppler probe by the cosine value of the angle between the vertical extension part and the extension direction of the blood vessel, S2 is the area of ​​the circular region where the second sampling gate is located, and S13 is the area of ​​the blood vessel after deducting S2.

6. A Doppler probe for measuring intravascular flow, characterized in that include: A T-shaped probe bracket consisting of a transverse extension portion and a vertical extension portion; wherein a first linear array probe is arranged on the transverse extension portion, a mounting assembly is provided on the vertical extension portion, and a second linear array probe and a Doppler probe are detachably arranged on the vertical extension portion via the mounting assembly; when in use, the transverse extension portion is arranged perpendicular to the blood vessel so as to detect the diameter of the blood vessel using the first linear array probe of the transverse extension portion, and the vertical extension portion is arranged at a position at the center of the blood vessel along the extension direction of the blood vessel so as to detect the angle between the vertical extension portion and the extension direction of the blood vessel using the second linear array probe of the vertical extension portion.

7. The Doppler probe for intravascular flow measurement according to claim 6, characterized in that: The first linear array probe and the second linear array probe have different operating frequencies.

8. The Doppler probe for intravascular flow measurement according to claim 6, characterized in that: The pulse wave Doppler probe and the second linear array probe have different operating frequencies.

9. The Doppler probe for intravascular flow measurement according to claim 6, characterized in that: The Doppler probe used for intravascular flow measurement calculates the instantaneous flow Q using the following formula: Q = V2*S2+S13*(V1+V3) / 2; Among them, V1 is the effective flow velocity obtained by multiplying the flow velocity of the first sampling gate detected by the pulse wave Doppler probe by the cosine value of the angle between the vertical extension part and the extension direction of the blood vessel, V2 is the effective flow velocity obtained by multiplying the flow velocity of the second sampling gate detected by the pulse wave Doppler probe by the cosine value of the angle between the vertical extension part and the extension direction of the blood vessel, V3 is the effective flow velocity obtained by multiplying the flow velocity of the third sampling gate 33 detected by the pulse wave Doppler probe by the cosine value of the angle between the vertical extension part 20 and the extension direction of the blood vessel, S2 is the area of ​​the circular region where the second sampling gate is located, and S13 is the area of ​​the blood vessel after deducting S2.

10. The Doppler probe for intravascular flow measurement according to claim 6, characterized in that: The Doppler probe is used to measure the blood flow rate of the internal carotid artery that supplies blood to the brain.

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