Electromagnetic-driven abdominal magnetic resonance elastography excitation device

Abstract

The invention provides an electromagnetically-driven abdomen magnetic resonance elastography excitation device. The electromagnetically-driven abdomen magnetic resonance elastography excitation device comprises a coil, a vibrating rod, a vibrating plate, a connecting rod and a supporting plate. The two ends of the vibration rod are fixedly connected with the coil and the vibration plate respectively, the coil is driven by current and a magnetic field to generate vibration in the vertical direction, and the vibration plate is driven by the vibration rod to generate vibration in the vertical direction; the vibration plate and the supporting plate are fixedly connected through the connecting rod to form a clamp shape, the vibration plate and the supporting plate are matched to clamp the abdominal cavity of the human body, the connecting rod is movably installed on the supporting plate, and the vibration plate can be close to or away from the supporting plate by moving the connecting rod. The electromagnetic drive coil vibrates, the vibration rod drives the vibration plate to vibrate, the vibration frequency is accurate, and the vibration amplitude can be continuously adjusted; the vibration plate and the supporting plate are matched with each other, such as a clamp, to clamp the abdominal cavity of a human body, so that the contact area with the abdominal cavity is enlarged, close fit with the human body is ensured, and the vibration efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and more specifically, to an electromagnetically driven abdominal magnetic resonance elastography excitation device. Background Technology

[0002] The background technology of the abdominal magnetic resonance elastography excitation device is mainly based on magnetic resonance elastography technology, which aims to evaluate the elastic properties of abdominal tissues by generating mechanical waves, thereby providing a basis for disease diagnosis.

[0003] A Chinese patent with publication number CN108618781A discloses a chest and abdomen magnetic resonance elastography driving device, including a base, a lifting seat, a locking device 1 for limiting the vertical sliding of the lifting seat relative to the base, a mounting seat, a sliding seat, a locking device 2 for limiting the horizontal sliding of the sliding seat relative to the mounting seat, and a support rod hinged to the sliding seat. The elastography driving device also includes a coil fixed to one end of the support rod near the mounting seat and a pressure plate disposed at the other end of the support rod. The hinge axis of the support rod is perpendicular to the axis of the support rod and the hinge point is close to the coil. The upper end of the lifting seat is provided with an arc-shaped groove for placing the support rod.

[0004] Currently, magnetic resonance elastography (MRI) techniques for thoracic and abdominal organs are mainly based on pneumatically driven methods. However, these methods suffer from drawbacks such as poor frequency accuracy and driving effect, numerous and complex auxiliary devices, high noise levels, and stringent requirements for component airtightness. Furthermore, existing excitation devices are primarily fixed to the abdomen using flexible straps. This non-rigid positioning is prone to displacement during vibration, or only the vibrating disc area can generate vibration, resulting in a limited vibration area, or the structure is complex and the vibration effect is poor.

[0005] Therefore, there is a need to provide an electromagnetically driven abdominal magnetic resonance elastography excitation device that has a simple structure, more stable vibration, a larger vibration area, more accurate vibration frequency, and enhanced vibration effect. Summary of the Invention

[0006] To address the shortcomings of existing technologies, the present invention aims to provide an electromagnetically driven abdominal magnetic resonance elastography excitation device.

[0007] An electromagnetically driven abdominal magnetic resonance elastography excitation device according to the present invention includes: a coil, a vibrating rod, a vibrating plate, a connecting rod, and a support plate; The two ends of the vibrating rod are respectively fastened to the coil and the vibrating plate. The coil generates vertical vibration through current and magnetic field drive, and the vibrating plate generates vertical vibration through the transmission of the vibrating rod. The vibrating plate and the support plate are fastened together in a clamp shape by a connecting rod. The vibrating plate and the support plate work together to clamp the human abdominal cavity. The connecting rod is movably mounted on the support plate. The vibrating plate can move closer to or further away from the support plate by moving the connecting rod.

[0008] Preferably, the conductor of the coil is wound in a cylindrical shape in the vertical direction, and the coil is connected to an alternating current and located in a constant magnetic field in the horizontal direction.

[0009] Preferably, the excitation device is located inside the magnetic resonance imaging (MRI) machine, and the coil is connected in sequence to the power amplifier, signal generator, and MRI control terminal via a transmission line passing through a shielding wall.

[0010] Preferably, the vibrating plate includes a first straight plate portion and a first arc-shaped portion, and the support plate includes a second straight plate portion and a second arc-shaped portion. The first straight plate portion and the second straight plate portion are arranged in parallel, and the first straight plate portion is fitted against the upper part of the abdominal cavity.

[0011] Preferably, the first arc-shaped portion and the second arc-shaped portion are connected by a connecting rod. A reserved groove is provided on the second arc-shaped portion along the vertical direction. The connecting rod can move up and down along the reserved groove. The connecting rod passes through the reserved groove and is fastened to the first arc-shaped portion.

[0012] Preferably, the radius of the center of the first arc-shaped portion is more than 5 cm, and the second arc-shaped portion matches the first arc-shaped portion.

[0013] Preferably, the length of the first straight plate portion exceeds 7 cm and the width exceeds 5 cm, and the second straight plate portion matches the first straight plate portion.

[0014] Preferably, the vibrating rod is arranged perpendicular to the first straight plate, and the coil is arranged on the side of the vibrating plate away from the human head.

[0015] Preferably, the vibration rod is installed on the side of the first straight plate near the first arc-shaped portion.

[0016] Preferably, the length of the vibrating rod is 5 cm or more.

[0017] Compared with the prior art, the present invention has the following beneficial effects: This invention solves the problems of inaccurate vibration frequency and continuously adjustable amplitude caused by previous pneumatic drive methods by using an electromagnetically driven coil to vibrate, which in turn drives a vibrating plate. The vibration frequency is accurate, and the vibration amplitude is continuously adjustable. By positioning the coil away from the magnetic resonance receiving coil using the vibrating rod, the interference of electromagnetic drive methods on normal magnetic resonance signals is eliminated. The vibration plate and support plate work together, clamping the abdominal cavity like a clip, which solves the problems of small vibration range and unstable vibration caused by movement during vibration in previous excitation devices. This increases the contact area with the abdominal cavity while ensuring close contact with the body, improving vibration efficiency. The invention is simple in structure, easy to use, provides more stable vibration, more accurate vibration frequency, and a larger vibration area, thus improving the vibration effect. Attached Figure Description

[0018] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 This is a schematic diagram of the structure of the electromagnetically driven abdominal magnetic resonance elastography excitation device, which is the main feature of this invention. Figure 2 This is a schematic diagram illustrating the principle of the electromagnetically driven abdominal magnetic resonance elastography excitation device of the present invention.

[0019] The diagram shows: coil 1, vibrating rod 2, vibrating plate 3, connecting rod 4, and support plate 5. Detailed Implementation

[0020] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0021] like Figure 1 As shown, an electromagnetically driven abdominal magnetic resonance elastography excitation device according to the present invention includes: a coil 1, a vibrating rod 2, a vibrating plate 3, a connecting rod 4, and a support plate 5; the two ends of the vibrating rod 2 are respectively fastened to the coil 1 and the vibrating plate 3; the coil 1 generates vertical vibration through current and magnetic field drive; the vibrating plate 3 generates vertical vibration through the transmission of the vibrating rod 2; the vibrating plate 3 and the support plate 5 are fastened together in a clamp shape through the connecting rod 4; the vibrating plate 3 and the support plate 5 cooperate to clamp the abdominal cavity of the human body; the connecting rod 4 is movably mounted on the support plate 5; the vibrating plate 3 can move closer to or further away from the support plate 5 by moving the connecting rod 4.

[0022] like Figure 2As shown, the excitation device is located inside the MRI machine. Coil 1 is connected to the power amplifier, signal generator, and MRI control terminal sequentially via a transmission line through a shielded wall. The MRI control terminal synchronizes the scanning sequence and the vibration of the excitation device according to the synchronization signal set in the scanning sequence executed by the MRI machine. After receiving the synchronization signal from the MRI control terminal, the signal generator emits a drive signal of a specific frequency. After the power amplifier amplifies the power of the drive signal, it is transmitted to the excitation device via the transmission line. The excitation device begins to vibrate under the drive of the main magnetic field B0 of the MRI machine. During vibration, the abdominal receiving coil can simultaneously acquire MRI signals.

[0023] The conductor of coil 1 is wound vertically in a cylindrical shape. Coil 1 is connected to an alternating current and located in a constant magnetic field in the horizontal direction. Coil 1 vibrates, driven by the current and magnetic field. According to Lenz's law, when coil 1 is energized in a constant magnetic field, it experiences an electromagnetic force generated by the magnetic field. The alternating current causes this electromagnetic force to change direction according to the alternating frequency, thus causing coil 1 to vibrate. In practical scenarios, the parameters of the external magnetic field and coil 1 are fixed; the amplitude and frequency of the vibration generated by coil 1 are only related to the amplitude and frequency of the external current. The generated vibration is transmitted to the vibrating plate 3 via the vibrating rod 2, and then transmitted by the vibrating plate 3 into the various tissues of the abdominal cavity. The vibration frequency and amplitude of the vibrating plate 3 are always consistent with the vibration frequency of coil 1 and are unaffected by its installation position.

[0024] The vibrating plate 3 includes a first straight plate portion and a first arc-shaped portion, and the support plate 5 includes a second straight plate portion and a second arc-shaped portion. The first straight plate portion and the second straight plate portion are arranged in parallel, and the first straight plate portion is fitted to the upper part of the abdominal cavity.

[0025] The first and second arc-shaped portions are connected by a connecting rod 4. A pre-drilled groove is provided on the second arc-shaped portion along the vertical direction, allowing the connecting rod 4 to move up and down along the groove. The connecting rod 4 passes through the groove and is securely connected to the first arc-shaped portion. Before vibration begins, the connecting rod 4 can move on the pre-drilled hole in the support plate 5, thereby moving the vibrating plate 3 up and down to adapt to different abdominal cavity sizes. Simultaneously, the connecting rod 4 can also assist in adjusting the vibration plate 3 and support plate 5 of the excitation device to clamp the subject's abdominal cavity like a clamp, improving vibration transmission efficiency. The height between the vibration plate 3 and support plate 5 is the height of the subject's abdominal cavity, which can be adjusted according to the subject's abdominal cavity height in practical applications.

[0026] The radius of the center of the first arc-shaped section is greater than 5cm, and the second arc-shaped section matches the first arc-shaped section. The length of the first straight plate exceeds 7cm and the width exceeds 5cm, and the second straight plate matches the first straight plate. This allows the contact area between the vibrating plate 3 and the abdominal cavity to exceed 35cm. 2 This ensures proper coverage of larger abdominal organs such as the liver. The end of the vibrating plate 3 will not extend beyond the body's perimeter.

[0027] Coil 1 is rigidly connected to vibrating rod 2. Vibrating rod 2 is also rigidly connected to vibrating plate 3. Vibrating rod 2 is installed on the side of the first straight plate near the first arc-shaped part to reduce the influence of the coil on abdominal organs. Vibrating rod 2 is set perpendicular to the first straight plate, and coil 1 is set on the side of vibrating plate 3 away from the human head. The length of vibrating rod 2 is more than 5cm, keeping coil 1 away from the abdominal MRI area and minimizing electromagnetic interference.

[0028] During vibration, coil 1 is energized with alternating current and vibrates under the influence of the main magnetic field B0 of the magnetic resonance imaging machine. The vibration is transmitted to the vibrating plate 3 via the vibrating rod 2. The vibrating plate 3 contacts the upper part of the subject's abdominal cavity and transmits the vibration into the subject's abdominal cavity. The support plate 5 restricts the position and vibration direction of the vibrating plate 3, preventing displacement of the vibrating plate 3 from its initial position during vibration and ensuring vibration stability. At the same time, the subject's abdominal cavity also supports the vibrating plate 3, thus preventing the vibrating plate 3 from shifting due to the movable connecting rod 4 during vibration.

[0029] This application solves the problems of inaccurate vibration frequency and inability to continuously adjust amplitude in previous pneumatic drive methods by using electromagnetically driven coil 1 to vibrate. The vibration frequency is accurate, and the vibration amplitude is continuously adjustable. This application also solves the problem of interference with normal magnetic resonance signals caused by electromagnetic drive methods by using a vibration rod 2 to move coil 1 away from the magnetic resonance receiving coil. Furthermore, this application solves the problems of small vibration range and unstable vibration caused by easy movement of the excitation device during vibration by using a vibration plate 3 and a support plate 5 in a clamp-like manner to hold the human abdominal cavity. This increases the contact area with the abdominal cavity while ensuring close contact with the human body, thus improving vibration efficiency.

[0030] This application provides support and limit for the vibrating plate 3 through the support plate 5, ensuring more stable vibration; it provides power through the electromagnetic coil, making the vibration frequency more accurate; the entire vibrating plate 3 can generate vibration, and the vibration area is larger; it greatly simplifies the structural complexity while enhancing the vibration effect.

[0031] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0032] Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. An electromagnetically driven abdominal magnetic resonance elastography excitation device, characterized in that, include: Coil (1), vibrating rod (2), vibrating plate (3), connecting rod (4), and support plate (5); The two ends of the vibrating rod (2) are respectively fastened to the coil (1) and the vibrating plate (3). The coil (1) generates vertical vibration through current and magnetic field drive, and the vibrating plate (3) generates vertical vibration through the transmission of the vibrating rod (2). The vibrating plate (3) and the support plate (5) are fastened together by the connecting rod (4) in the form of a clamp. The vibrating plate (3) and the support plate (5) work together to clamp the abdominal cavity of the human body. The connecting rod (4) is movably installed on the support plate (5). The vibrating plate (3) can move closer to or further away from the support plate (5) by moving the connecting rod (4).

2. The electromagnetically driven abdominal magnetic resonance elastography excitation device as described in claim 1, characterized in that, The wire of the coil (1) is wound in a cylindrical shape in the vertical direction. The coil (1) is connected to an alternating current and is located in a constant magnetic field in the horizontal direction.

3. The electromagnetically driven abdominal magnetic resonance elastography excitation device as described in claim 1, characterized in that, The excitation device is set inside the magnetic resonance machine. The coil (1) is connected to the power amplifier, signal generator and magnetic resonance control terminal in sequence through the shielding wall via a transmission line.

4. The electromagnetically driven abdominal magnetic resonance elastography excitation device as described in claim 1, characterized in that, The vibrating plate (3) includes a first straight plate portion and a first arc-shaped portion, and the support plate (5) includes a second straight plate portion and a second arc-shaped portion. The first straight plate portion and the second straight plate portion are arranged in parallel, and the first straight plate portion is fitted to the upper part of the abdominal cavity.

5. The electromagnetically driven abdominal magnetic resonance elastography excitation device as described in claim 4, characterized in that, The first arc-shaped part and the second arc-shaped part are connected by a connecting rod (4). A reserved groove is provided on the second arc-shaped part along the vertical direction. The connecting rod (4) can move up and down along the reserved groove. The connecting rod (4) passes through the reserved groove and is fastened to the first arc-shaped part.

6. The electromagnetically driven abdominal magnetic resonance elastography excitation device as described in claim 4, characterized in that, The radius of the center of the first arc-shaped part is more than 5cm, and the second arc-shaped part matches the first arc-shaped part.

7. The electromagnetically driven abdominal magnetic resonance elastography excitation device as described in claim 1, characterized in that, The length of the first straight plate exceeds 7 cm and the width exceeds 5 cm, and the second straight plate matches the first straight plate.

8. The electromagnetically driven abdominal magnetic resonance elastography excitation device as described in claim 1, characterized in that, The vibrating rod (2) is set perpendicular to the first straight plate, and the coil (1) is set on the side of the vibrating plate (3) away from the human head.

9. The electromagnetically driven abdominal magnetic resonance elastography excitation device as described in claim 1, characterized in that, The vibrating rod (2) is installed on the side of the first straight plate near the first arc-shaped part.

10. The electromagnetically driven abdominal magnetic resonance elastography excitation device as described in claim 1, characterized in that, The length of the vibrating rod (2) is more than 5 cm.

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