Transcranial Doppler dual-mode ultrasonic detection device

Abstract

The invention discloses a transcranial Doppler dual-mode ultrasonic detection device, and belongs to the field of medical instruments. A cable; a back lining layer, a piezoelectric layer, a matching layer and a lens layer are sequentially arranged in the execution probe in the detection direction, and the cable penetrates through the handle and the back lining layer and is electrically connected with the piezoelectric layer; the piezoelectric layer comprises a TCD piezoelectric ceramic array element and TCCD piezoelectric ceramic arrays symmetrically distributed on the two sides of the TCD piezoelectric ceramic array element. The detection area of the TCD piezoelectric ceramic array element is at least partially overlapped with the imaging area of the TCCD piezoelectric ceramic array, and the overlapped part of the detection area and the imaging area is an overlapped area; and when the overlapped area scans the human body part, the TCD piezoelectric ceramic array element acquires Doppler spectrum information of the part, and meanwhile, the TCCD piezoelectric ceramic array acquires an image of the part. Through the arrangement, the probe does not need to be moved when the TCD mode and the TCCD mode are switched.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of medical devices, and particularly relates to a transcranial Doppler dual-mode ultrasonic detection device. BACKGROUND

[0002] Transcranial Doppler ultrasound is an important non-invasive detection method for evaluating cerebral vascular function, mainly including two technologies of transcranial Doppler (TCD) and transcranial color-coded duplex (TCCD). Among them, the TCD technology with deeper detection depth is suitable for long-term monitoring of hemodynamics, but cannot provide two-dimensional structure images of blood vessels; and the TCCD can provide intuitive two-dimensional structure and blood flow images, but its penetration is weak, and it is highly dependent on the bone window condition of the patient during use, and the probe volume is large and difficult to position. Chinese patent CN115429324A proposes a dual-mode transcranial ultrasonic Doppler imaging device, which sets the TCD probe and the TCCD probe at different positions of the operation handle, and switches to the imaging mode after preliminary screening and positioning. However, the scheme has the following defects:

[0003] The TCD detection area and the TCCD detection area of the device do not coincide, and the probe needs to be moved for imaging after preliminary screening, resulting in large positioning error and complicated operation.

[0004] Therefore, a positioning and imaging device that does not need to move the probe when switching between TCD and TCCD detection is designed, which is a transcranial Doppler dual-mode ultrasonic detection device. SUMMARY

[0005] In order to overcome the problems proposed in the background art, the application adopts the following technical scheme:

[0006] A transcranial Doppler dual-mode ultrasonic detection device, comprising: a handle; a cable; an execution probe, the execution probe is sequentially provided with a backing layer, a piezoelectric layer, a matching layer and a lens layer along a detection direction, the backing layer is fixedly connected with the piezoelectric layer, the piezoelectric layer is fixedly connected with the matching layer, the matching layer is fixedly connected with the lens layer, and the cable penetrates the handle and is electrically connected with the backing layer and the piezoelectric layer;

[0007] The piezoelectric layer comprises a TCD piezoelectric ceramic array element and TCCD piezoelectric ceramic arrays symmetrically distributed on both sides of the TCD piezoelectric ceramic array element; a detection area of the TCD piezoelectric ceramic array element at least partially overlaps with an imaging area of the TCCD piezoelectric ceramic arrays, and the overlapping part of the detection area and the imaging area is an overlapping area; when the overlapping area sweeps a human body part, the TCD piezoelectric ceramic array element acquires Doppler spectrum information of the corresponding part, and at the same time, the TCCD piezoelectric ceramic arrays acquire images of the corresponding part.

[0008] Further, the execution probe has a connecting end and a detection end, and the detection direction is perpendicular to the detection end from the connecting end; the connecting end is detachably connected with the handle.

[0009] Further, the TCD piezoelectric ceramic array element and the TCCD piezoelectric ceramic arrays respectively have a transmission surface towards the detection end, and the transmission surface of the TCD piezoelectric ceramic array element is flush with the transmission surface of the TCCD piezoelectric ceramic arrays.

[0010] Further, the TCD piezoelectric ceramic array element is a single array element, and the projection shape thereof along the detection direction is one of a rectangle and a circle; when the TCD piezoelectric ceramic array element is a circle, the diameter is not greater than the horizontal width of the TCCD piezoelectric ceramic arrays.

[0011] Further, the working frequency of the TCD piezoelectric ceramic array element is 1-2 MHz, and the working frequency of the TCCD piezoelectric ceramic arrays is 2-3 MHz.

[0012] Further, the TCCD piezoelectric ceramic arrays are composed of two groups of TCCD piezoelectric ceramic array elements with equal number, and the total number of the TCCD piezoelectric ceramic array elements is not less than 64.

[0013] In addition, an ultrasonic diagnostic system is also included, which comprises the transcranial Doppler dual-mode ultrasonic detection device; a system host configured to drive the execution probe and process Doppler signals in the TCD mode and imaging signals in the TCCD mode; and a display unit configured to simultaneously or time-divisionally display TCD spectrum and TCCD images.

[0014] Further, the system host is configured to: when a preset abnormal condition is detected in the TCD mode, turn off the signal emission of the TCD mode and only use the TCCD mode for imaging, so as to avoid signal interference.

[0015] The present application has the following beneficial effects:

[0016] 1. The application integrates the TCD piezoelectric ceramic array element and the TCCD piezoelectric ceramic array in the same execution probe, and makes the detection area and the imaging area of the two have overlapping parts, so that after the TCD preliminary screening positioning, TCCD imaging can be directly performed without moving the probe, which significantly improves the diagnosis efficiency and accuracy.

[0017] 2. The application sets the TCD piezoelectric ceramic array element and the TCCD piezoelectric ceramic array working simultaneously or in time-sharing mode, and also sets an ultrasonic diagnostic system, which can identify the probe and drive the probe to switch to the TCD mode, the TCCD mode or the dual mode, and the images obtained by the TCCD piezoelectric ceramic arrays on both sides can be spliced, thereby greatly simplifying the operation process. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can also be obtained by those skilled in the art without creative labor. Among them:

[0019] Figure 1 It is a front view of the overall structure of the application;

[0020] Figure 2 It is a right view of the overall structure of the application;

[0021] Figure 3 It is Figure 2 a cross-sectional structure schematic diagram in the A direction;

[0022] Figure 4 It is Figure 3 a local enlarged structure schematic diagram at B;

[0023] Figure 5 It is a structure and detection range schematic diagram of the piezoelectric layer;

[0024] In the figure, 1 is an execution probe; 11 is a detection direction; 12 is a backing layer; 13 is a piezoelectric layer; 131 is a TCD piezoelectric ceramic array element; 1311 is a transmitting surface; 132 is a detection area; 133 is a TCCD piezoelectric ceramic array; 1331 is a TCCD piezoelectric ceramic array element; 134 is an imaging area; 135 is an overlapping area; 14 is a matching layer; 15 is a lens layer; 16 is a connecting end; 17 is a detection end; 2 is a handle; 3 is a cable; 31 is a joint. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present application are clearly and completely described below through specific specific embodiments. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the content disclosed in the present application, those skilled in the art can easily understand other advantages and effects of the present application. The present application can also be implemented or applied through other different specific embodiments, and the following embodiments and features in the embodiments can be combined with each other without conflict. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0026] A transcranial Doppler dual-mode ultrasonic detection device, as shown in Figures 1-5 includes: a handle 2; a cable 3; an execution probe 1, the execution probe 1 is sequentially provided with a backing layer 12, a piezoelectric layer 13, a matching layer 14 and a lens layer 15 along a detection direction 11, the backing layer 12 is fixedly connected with the piezoelectric layer 13, the piezoelectric layer 13 is fixedly connected with the matching layer 14, the matching layer 14 is fixedly connected with the lens layer 15, the cable 3 penetrates through the handle 2 and the backing layer 12 and is electrically connected with the piezoelectric layer 13, and the end of the cable 3 away from the handle 2 has a connector 31; more specifically, the number of the cable 3 is at least one, and the end of each cable 3 away from the handle 2 has at least one connector 31.

[0027] The backing layer 12 is used to absorb the ultrasonic waves emitted by the piezoelectric layer 13 in the reverse detection direction 11 to prevent interference of the reflected ultrasonic waves with the main sound beam. The backing layer 12 is composed of a backing material, which is specifically a mixture of epoxy resin and sound-absorbing materials such as tungsten powder. The backing layer 12 can also make the piezoelectric wafer stop vibrating rapidly after the electric pulse stops, thereby shortening the pulse length and improving the axial resolution of the image. The connection mode of the backing layer 12 and the piezoelectric layer 13 is specifically as follows: first, fix the TCD piezoelectric ceramic elements 131 and the TCCD piezoelectric ceramic array 133 in a mold, and ensure that the surfaces of the piezoelectric ceramic elements facing the bottom end of the mold are flush; then, reserve a channel for the cable 3, and then pour the backing material into the mold, so that the end of the backing layer 12 and the end of the piezoelectric ceramic array facing the connection end part 16 are fixedly connected at high temperature.

[0028] The piezoelectric layer 13 is connected with a system host through the cable 3. The piezoelectric ceramic elements constituting the piezoelectric layer 13 are used to realize bidirectional conversion between electric signals and mechanical vibrations. When the system host transmits electric signals through the cable 3, the piezoelectric ceramic elements convert the electric signals into ultrasonic waves. When the ultrasonic waves are reflected back to the piezoelectric ceramic elements, the ultrasonic waves are converted into electric signals and received by the system host through the cable 3.

[0029] The acoustic impedance of piezoelectric ceramic is about 30 MRayl, while the average acoustic impedance of human body is 1.5 MRayl, so when the ultrasonic wave emitted by piezoelectric ceramic directly acts on human body, a large amount of ultrasonic wave will be reflected. By setting the matching layer 14 made of composite material with acoustic impedance value of 7 MRayl (the value is obtained by rounding the geometric mean of the acoustic impedance of piezoelectric ceramic and human body), the composite material can be a mixture of epoxy resin, aluminum oxide powder and tungsten powder, and the matching layer 14 is bonded with the piezoelectric layer 13 by adhesive. Most of the energy of the ultrasonic wave can be smoothly transmitted from the high-impedance piezoelectric ceramic to the intermediate-impedance matching layer 14, and then from the intermediate-impedance matching layer 14 to the low-impedance human tissue, thereby avoiding the waste of ultrasonic wave and ensuring the overall transmittance in the ultrasonic detection process.

[0030] The outer wall of the lens layer 15 has a curvature to form a curved surface capable of converging the ultrasonic wave beam, which is beneficial to improve the lateral resolution of the image, and the depth of ultrasonic focusing increases with the increase of the curvature of the curved surface. The lens layer 15 is fixedly connected to the end of the matching layer 14 away from the piezoelectric layer 13 by molding or acoustic glue, so that the backing layer 12, the piezoelectric layer 13, the matching layer 14 and the lens layer 15 form an integral whole, thereby reducing the energy loss and internal reflection when the ultrasonic wave passes through.

[0031] The outer wall of the execution probe 1 is open at the detection end 17, and the end of the lens layer 15 away from the backing layer 12 is exposed outside through the opening and flush with the outer wall of the execution probe 1, so that the outer wall of the detection end 17 presents a smooth curved surface, preventing the lens layer 15 and the detection end 17 from forming a step on the outer wall of the execution probe 1, thereby preventing the execution probe 1 from scratching the patient when it is drawn across the patient's skin.

[0032] The working modes of the execution probe 1 include: TCD mode in which only the TCD piezoelectric ceramic array element 131 works and generates the detection area 132; TCCD mode in which only the TCCD piezoelectric ceramic array 133 works and generates the imaging area 134; and dual mode in which the TCD piezoelectric ceramic array element 131 and the TCCD piezoelectric ceramic array 133 work simultaneously.

[0033] The piezoelectric layer 13 includes a TCD piezoelectric ceramic array element 131 and a TCCD piezoelectric ceramic array 133 symmetrically distributed on both sides of the TCD piezoelectric ceramic array element 131; a detection area 132 of the TCD piezoelectric ceramic array element 131 at least partially overlaps with an imaging area 134 of the TCCD piezoelectric ceramic array 133, and the overlapping part of the detection area 132 and the imaging area 134 is an overlapping area 135; when the overlapping area 135 scans a part of a human body, the TCD piezoelectric ceramic array element 131 obtains Doppler spectrum information of the corresponding part, and at the same time, the TCCD piezoelectric ceramic array 133 obtains an image of the corresponding part. The execution probe 1 also includes a shell, and the shell has openings at both ends in the detection direction 11 to facilitate the connection of the connection end 16 with the handle 2, and also facilitates the extension of the lens layer 15 to the outer wall of the execution probe 1 through the detection end 17. The several layered structures distributed in the execution probe 1 along the detection direction 11 are packaged in the shell, so that the appearance of the assembled execution probe 1 and the handle 2 is consistent with that of a conventional B-ultrasound probe, facilitating holding and operation, and being applicable to various clinical scenes, having good practicability and popularization value. In use, the TCD or TCCD is selectively started and stopped according to the needs of preliminary screening and imaging, so as to avoid signal interference when the two modes work at the same time, and to ensure the image quality.

[0034] In some embodiments of the present application, as shown in Figures 1-5 The execution probe 1 has a connection end 16 and a detection end 17, and the detection direction 11 is perpendicular to the detection end 17 from the connection end 16; the connection end 16 is detachably connected with the handle 2.

[0035] In some embodiments of the present application, as shown in Figures 1-5 The TCD piezoelectric ceramic array element 131 and the TCCD piezoelectric ceramic array 133 each have a transmission surface 1311 facing the detection end 17, and the transmission surface 1311 of the TCD piezoelectric ceramic array element 131 is flush with the transmission surface 1311 of the TCCD piezoelectric ceramic array 133 (to avoid a step or a small overlapping area caused by the step). The ultrasonic waves are emitted outward from the end surface of the piezoelectric layer 13 in contact with the matching layer 14. If the surfaces of the TCD and TCCD array elements facing the matching layer 14 are in the same horizontal plane, the heights of the sound wave emission points of the TCD and TCCD array elements are the same, so that the sound beams emitted by the TCD piezoelectric ceramic array element 131 and the TCCD piezoelectric ceramic array 133 can start to form the overlapping area 135 in the near-field region close to the detection end 17.

[0036] In some embodiments of the present application, as shown in Figures 1-5As shown, the TCD piezoelectric ceramic array element 131 is a single array element, and its projection shape along the detection direction 11 is one of a rectangle or a circle; when it is a circle, its diameter is not greater than the horizontal width of the TCCD piezoelectric ceramic array 133; and the sound beam emitted is conical, and such a shaped sound beam has no directionality when propagating, and the detection characteristics in any horizontal direction are consistent, thereby facilitating the simplification of the preliminary screening operation; on the contrary, when the shape of the array element is a rectangle, the sound beam emitted by the piezoelectric ceramic array element is asymmetric, thereby being able to obtain a wider detection range in the long side direction of the rectangle.

[0037] In some embodiments of the present application, as shown in Figures 1-5 The working frequency of the TCD piezoelectric ceramic array element 131 is 1-2 MHz, and the working frequency of the TCCD piezoelectric ceramic array 133 is 2-3 MHz.

[0038] In some embodiments of the present application, as shown in Figures 1-5 The TCCD piezoelectric ceramic array 133 is composed of two groups of equal number of TCCD piezoelectric ceramic array elements 1331, and the total number of TCCD piezoelectric ceramic array elements 1331 is not less than 64 and not more than 80, wherein each TCCD piezoelectric ceramic array element 1331 is connected with a signal line one by one, and the end of the signal line away from the piezoelectric ceramic array element is in communication connection with the cable 3.

[0039] In addition, an ultrasonic diagnostic system is also included, which comprises the transcranial Doppler dual-mode ultrasonic detection device; a system host configured to drive the probe 1 and process the Doppler signal in the TCD mode and the imaging signal in the TCCD mode; and a display unit configured to simultaneously or time-divisionally display the TCD spectrum and the TCCD image.

[0040] In some embodiments of the present application, as shown in Figures 1-5 The system host is configured to: when a preset abnormal condition is detected in the TCD mode, turn off the signal emission of the TCD mode and only use the TCCD mode for imaging, so as to avoid signal interference. The preset abnormal condition is specifically: blood flow rate abnormality which can be used as an index of blood vessel stenosis or occlusion; spectrum form abnormality which reflects downstream blood vessel resistance abnormality; blood flow direction abnormality which indicates blood stealing phenomenon, and unidirectional high-intensity acoustic frequency signal (which can represent the risk of stroke caused by microembolus) monitored in the blood flow.

[0041] In some embodiments of the present application, a method for applying the transcranial Doppler dual-mode ultrasonic detection device is also included, which comprises:

[0042] S1. connecting the probe to the system host, and the system host recognizing and entering the dual-mode working state;

[0043] S2. Simultaneously or separately, start to execute the TCD mode of the probe 1, the TCD piezoelectric ceramic array 131 acquires the Doppler spectrum information of the brain blood flow and transmits back to the system host through the cable 3;

[0044] S3. Start to execute the TCCD mode of the probe 1, the TCCD piezoelectric ceramic array 133 acquires the two-dimensional ultrasound image of the corresponding region and transmits back to the system host through the cable 3;

[0045] S4. Based on the characteristic that the detection region 132 of the TCD piezoelectric ceramic array 131 coincides with the TCCD piezoelectric ceramic array 133, when the abnormal signal is detected in the TCD mode, the corresponding two-dimensional image in the coincident region 135 is acquired directly through the TCCD mode, so that the probe does not need to be moved in the imaging operation after the preliminary screening.

[0046] In some embodiments of the present application, as shown in Figures 1-5 In the TCCD mode, the images acquired by the TCD piezoelectric ceramic array 131 on both sides of the TCCD piezoelectric ceramic array 133 are spliced in real time to form a complete brightness mode image, which is also conducive to reducing or avoiding the movement of the probe after the preliminary screening positioning.

Claims

1. A transcranial Doppler dual-mode ultrasound detection device, comprising a handle and a cable, characterized in that, include: An execution probe is provided, in which a backing layer, a piezoelectric layer, a matching layer and a lens layer are sequentially arranged along a detection direction. The backing layer is fixedly connected to the piezoelectric layer, the piezoelectric layer is fixedly connected to the matching layer, and the matching layer is fixedly connected to the lens layer. A cable passes through the handle and the backing layer and is electrically connected to the piezoelectric layer. The piezoelectric layer includes a TCD piezoelectric ceramic element and a TCCD piezoelectric ceramic array symmetrically distributed on both sides of the TCD piezoelectric ceramic element. The detection area of ​​the TCD piezoelectric ceramic element and the imaging area of ​​the TCCD piezoelectric ceramic array at least partially overlap, and the overlapping part of the detection area and the imaging area is called the overlapping area. When the overlapping area scans across a human body part, the TCD piezoelectric ceramic element acquires the Doppler spectrum information of the corresponding part, and at the same time, the TCCD piezoelectric ceramic array acquires the image of the corresponding part.

2. The transcranial Doppler dual-mode ultrasound detection device according to claim 1, characterized in that, The actuator probe has a connecting end and a probing end, and the probing direction is perpendicular to the probing end from the connecting end; the connecting end is detachably connected to the handle.

3. The transcranial Doppler dual-mode ultrasound detection device according to claim 2, characterized in that, The TCD piezoelectric ceramic element and the TCCD piezoelectric ceramic array each have a transmitting surface facing the detection end, and the transmitting surface of the TCD piezoelectric ceramic element is flush with the transmitting surface of the TCCD piezoelectric ceramic array.

4. The transcranial Doppler dual-mode ultrasound detection device according to claim 1, characterized in that, The TCD piezoelectric ceramic array element is a single element, and its projection shape along the detection direction is either rectangular or circular; when it is circular, its diameter is not greater than the horizontal width of the TCCD piezoelectric ceramic array.

5. A transcranial Doppler dual-mode ultrasound detection device according to claim 1, characterized in that, The operating frequency of the TCD piezoelectric ceramic element is 1-2MHz, and the operating frequency of the TCCD piezoelectric ceramic array is 2-3MHz.

6. The transcranial Doppler dual-mode ultrasound detection device according to claim 1, characterized in that, The TCCD piezoelectric ceramic array consists of two sets of equal numbers of TCCD piezoelectric ceramic elements, with a total number of no less than 64 TCCD piezoelectric ceramic elements.

7. An ultrasound diagnostic system, characterized in that, include: The transcranial Doppler dual-mode ultrasound detection device as described in any one of claims 1-6; The system host is used to drive the execution probe and process the Doppler signal in TCD mode and the imaging signal in TCCD mode; The display unit is used to display the TCD spectrum and TCCD image simultaneously or in a time-sharing manner.

8. The system according to claim 7, characterized in that, The system host is configured to shut down the signal transmission of the TCD mode when a preset abnormal condition is detected in the TCD mode, and use only the TCCD mode for imaging to avoid signal interference.

9. A method for using the ultrasound diagnostic system of claim 8, characterized in that, Includes the following steps: S1. Connect the probe to the system host, and the system host recognizes it and enters the dual-mode working state; S2. Activate the TCD mode of the execution probe, and the TCD piezoelectric ceramic array element acquires the Doppler spectrum information of cerebral blood flow and transmits it back to the system host via cable; S3. Activate the TCCD mode of the execution probe, and the TCCD piezoelectric ceramic array acquires a two-dimensional ultrasonic image of the corresponding area and transmits it back to the system host via cable; S4. Based on the characteristic that the detection areas of the TCD piezoelectric ceramic array element and the TCCD piezoelectric ceramic array overlap, when the TCD mode detects an abnormal signal, the corresponding two-dimensional image is directly obtained in the overlapping area through the TCCD mode.

10. The method according to claim 9, characterized in that, In the TCCD mode, the images acquired by the TCCD piezoelectric ceramic arrays on both sides of the TCD piezoelectric ceramic array element are stitched together in real time to form a complete brightness mode image.

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