Rotary transformer and intravascular ultrasound device

Abstract

The invention relates to a rotary transformer and an intravascular ultrasound device. The rotary transformer comprises a rotor main body, a rotor magnetic core, a first circuit structure, a stator main body, a stator magnetic core, a second circuit structure and a rotating shaft, the rotor magnetic core is mounted on the rotor main body; the first circuit structure is mounted on one surface of the rotor magnetic core back to the rotor main body; the stator body is located on one side of the rotor magnetic core back to the rotor body; the stator magnetic core is mounted on the stator main body; the second circuit structure is installed on the surface, facing the first circuit structure, of the stator magnetic core, the second circuit structure and the first circuit structure are spaced, and the second circuit structure is in communication connection with the first circuit structure; and the rotating shaft is fixed with the rotor main body and sequentially penetrates through the rotor magnetic core, the first circuit structure, the second circuit structure, the stator magnetic core and the stator main body. The intravascular ultrasound device includes a motor, a base, a joint, a diagnostic catheter, and a resolver. According to the scheme provided by the invention, the loss and the cost can be effectively reduced.

Description

Technical Field

[0001] This application relates to the technical field of medical devices, and particularly to a resolver and an intravascular ultrasound device. Background Art

[0002] The retraction motor of an intravascular ultrasound system can provide a motive power source for a diagnostic catheter and drive the diagnostic catheter to perform a circumferential rotational movement within a blood vessel to achieve the acquisition of radial image data. The image data collected at the front end of the diagnostic catheter is transmitted back to the signal converter of the retraction motor through a circuit. After passing through the signal converter, the signal transmission line is dynamically converted to a static state physically, so as to establish signal communication with a static imaging host, and finally realize the functions of image data processing and imaging. The reliable stability of the signal converter directly affects the integrity and accuracy of image data transmission, and thus affects the image authenticity and resolution.

[0003] Currently, slip rings and resolvers are mainly used as signal converters in market products. The slip ring realizes signal conversion and transmission through the contact friction between the stator brush wire and the rotor circuit plating layer. The resolver has the following two structural forms: cylindrical and pot-shaped. Different structural forms are distinguished according to the position of the winding arranged on the magnetic core. The winding arranged on the circumferential surface of the magnetic core belongs to the cylindrical type, and the winding arranged on the end face of the magnetic core belongs to the pot-shaped type. Each structural form has a stator magnetic core winding and a rotor magnetic core winding. The two are separated in structure and can generate relative rotational movement. The stator magnetic core and the rotor magnetic core cooperate to generate an electromagnetic field, and the signal of the rotor magnetic core winding can be transmitted to the stator magnetic core winding through electromagnetic coupling, so as to realize separated signal conversion and transmission.

[0004] Among them, the contact friction between the stator brush wire and the rotor circuit plating layer has relatively large losses, which easily leads to a short service life of the retraction motor, high movement noise, and the movement vibration will cause contact fluctuations and affect the stability of signal transmission; when using a cylindrical resolver, it is difficult to arrange windings on the inner diameter and outer diameter of the magnetic core, and grinding is required to obtain good surface roughness, the processing is complex and the cost is high; when using a pot-shaped resolver, the loss of the cable-type winding is large, the process requirements are high, and the cost is high. Summary of the Invention

[0005] To solve or partially solve the problems existing in the related art, this application provides a resolver and an intravascular ultrasound device, which can effectively reduce losses and costs, and the processing is simple.

[0006] The first aspect of the present application provides a resolver, which includes a rotor main body, a rotor core, a first circuit structure, a stator main body, a stator core, a second circuit structure, and a rotating shaft; the rotor core is installed on the rotor main body; the first circuit structure is installed on a surface of the rotor core facing away from the rotor main body; the stator main body is located on a side of the rotor core facing away from the rotor main body; the stator core is installed on the stator main body; the second circuit structure is installed on a surface of the stator core facing the first circuit structure, the first circuit structure and the second circuit structure are flexible circuits, the second circuit structure is spaced from the first circuit structure, and the second circuit structure is communicatively connected to the first circuit structure; the rotating shaft is fixed to the rotor main body, and the rotating shaft sequentially passes through the rotor core, the first circuit structure, the second circuit structure, the stator core, and the stator main body.

[0007] Further, the resolver further includes an adapter board, a first extension wire, and a first extension arm. The adapter board is installed on the rotor main body. The first circuit structure includes a first winding and a first substrate. One end of the first extension arm is connected to the first substrate, the other end of the first extension arm passes through the rotor core and is connected to the adapter board. The first winding is installed on the first substrate. The first extension wire is located on the first extension arm. One end of the first extension wire is electrically connected to the first winding, and the other end of the first extension wire is electrically connected to the adapter board.

[0008] Further, the first winding includes at least two first conductive rings with different diameters and at least one first connection wire. Each first conductive ring is provided with a first break. A plurality of the first breaks are located on the same straight line. Adjacent two first conductive rings are electrically connected through the first connection wire, and the first connection wire straddles the first break.

[0009] Further, the resolver further includes a circuit board, a second extension wire, and a second extension arm. The circuit board is installed on the stator main body. The second circuit structure includes a second winding and a second substrate. One end of the second extension arm is connected to the second substrate, the other end of the second extension arm passes through the stator core and is connected to the circuit board. The second winding is installed on the second substrate. The second extension wire is located on the second extension arm. One end of the second extension wire is electrically connected to the second winding, and the other end of the second extension wire is electrically connected to the circuit board.

[0010] Further, the second winding includes at least two second conductive rings with different diameters and at least one second connection line. Each of the second conductive rings is provided with a second break, and a plurality of the second breaks are located on the same straight line. Adjacent two of the second conductive rings are electrically connected through the second connection line, and the second connection line straddles the second break.

[0011] Further, a stator groove is formed on a surface of the stator core facing the rotor core, and the second circuit structure is embedded in the stator groove, and an outer surface of the second circuit structure is flush with the surface of the stator core facing the rotor core.

[0012] Further, a rotor groove is formed on a surface of the rotor core facing the stator core, and the first circuit structure is embedded in the rotor groove, and an outer surface of the first circuit structure is flush with the surface of the rotor core facing the stator core.

[0013] Further, a depth of the rotor groove is less than or equal to 0.5 mm.

[0014] Further, a distance between the rotor core and the stator core is less than or equal to 0.5 mm.

[0015] Further, the rotor core and the stator core are made of nickel-zinc ferrite.

[0016] An intravascular ultrasound device includes a motor, a base, a connector, a diagnostic catheter, and the resolver according to any one of claims 1-9. The motor drives the rotating shaft to rotate, the stator body is fixed to the base, the connector is mounted on the rotor body, the diagnostic catheter is connected to the connector, and the first circuit structure is communicatively connected to the diagnostic catheter through the connector.

[0017] The technical solution provided by the present application may include the following beneficial effects: By arranging the second circuit structure and the first circuit structure at intervals, and driving the rotor core to rotate relative to the stator core by the rotating shaft, so that the first circuit structure rotates relative to the second circuit structure. The first circuit structure can transmit signals to the second circuit structure through electromagnetic coupling in an electromagnetic field, thereby realizing separated signal conversion and transmission. And since the first circuit structure and the second circuit structure are flexible circuits, compared with the traditional cable-type windings, the loss and cost can be effectively reduced, and it is also convenient to mount the first circuit structure on the rotor core and the second circuit structure on the stator core.

[0018] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present application. Description of the Drawings

[0019] The above and other objects, features, and advantages of the present application will become more apparent by describing the exemplary embodiments of the present application in more detail with reference to the accompanying drawings, wherein, in the exemplary embodiments of the present application, the same reference numerals generally represent the same components.

[0020] Figure 1 is an exploded schematic view of a resolver shown in an embodiment of the present application;

[0021] Figure 2 is a cross-sectional view of a resolver shown in an embodiment of the present application;

[0022] Figure 3 is a schematic structural view of a rotor body shown in an embodiment of the present application;

[0023] Figure 4 is a schematic structural view of a stator body shown in an embodiment of the present application;

[0024] Figure 5 is a schematic structural view of a rotor core shown in an embodiment of the present application;

[0025] Figure 6 is a schematic structural view of a first circuit structure shown in an embodiment of the present application;

[0026] Figure 7 is another schematic structural view of a first circuit structure shown in an embodiment of the present application;

[0027] Figure 8 is a schematic structural view of a second circuit structure shown in an embodiment of the present application;

[0028] Figure 9 is a schematic structural view of an intravascular ultrasound device shown in an embodiment of the present application;

[0029] Figure 10 is a cross-sectional view of a retraction motor shown in an embodiment of the present application.

[0030] Reference numerals: rotor body 1; first mounting groove 11; rotor core 2; rotor groove 21; first through hole 22; first circuit structure 3; first conductive ring 31; first break 311; first connecting wire 32; first substrate 33; first inner through hole 331; first outer through hole 332; stator body 4; second mounting groove 41; stator core 5; second circuit structure 6; second conductive ring 61; second break 611; second connecting wire 62; second substrate 63; second inner through hole 631; second outer through hole 632; rotating shaft 7; adapter plate 81; first extension wire 82; first extension arm 83; circuit board 91; second extension arm 93; diagnostic catheter 100; retraction motor 200; unlocking assembly 201; motor 202; base 203; joint 204; first coupling 205; second coupling 206; transmission shaft 207. Detailed implementation manners

[0031] The embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although the embodiments of the present application are shown in the drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to make the present application more thorough and complete, and to fully convey the scope of the present application to those skilled in the art.

[0032] It should be understood that although the terms "first", "second", "third", etc. may be used in the present application to describe various information, such information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present application, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, the meaning of "a plurality" is two or more unless otherwise specifically defined.

[0033] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application 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 should not be construed as a limitation to the present application.

[0034] Unless otherwise clearly defined and limited, the terms "mounted", "connected", "connected to", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0035] In view of the above problems, an embodiment of the present application provides a resolver, which can effectively reduce losses and costs, and is simple to process.

[0036] The technical solutions of the embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0037] Figure 1 is an exploded schematic view of the resolver shown in the embodiment of the present application; Figure 2It is a cross-sectional view of the resolver shown in the embodiments of the present application.

[0038] Refer to Figure 1-2 , the resolver includes a rotor main body 1, a rotor core 2, a first circuit structure 3, a stator main body 4, a stator core 5, a second circuit structure 6, and a rotating shaft 7. The rotor core 2 is installed on the rotor main body 1, and the rotor core 2 is relatively fixed to the rotor main body 1.

[0039] Figure 3 It is a schematic structural diagram of the rotor main body shown in the embodiments of the present application;

[0040] Refer to Figure 3 , the rotor main body 1 is tubular, the rotor main body 1 is axially provided with a first installation groove 11, the rotor core 2 is embedded in the first installation groove 11, and the rotor core 2 is adhesively bonded to the first installation groove 11 by glue. The first circuit structure 3 is a flexible circuit, and the first circuit structure 3 is installed on the side of the rotor core 2 facing away from the rotor main body 1. The first circuit structure 3 can receive electrical signals and can also send electrical signals outward.

[0041] Figure 4 It is a schematic structural diagram of the stator main body shown in the embodiments of the present application.

[0042] Refer to Figure 2-4 , the stator main body 4 is located on the side of the rotor core 2 facing away from the rotor main body 1. During actual operation, the rotor main body 1 rotates relative to the stator main body 4. The stator core 5 is adhesively bonded to the stator main body 4, and the stator core 5 is relatively fixed to the stator main body 4. Specifically, the stator main body 4 is disc-shaped, the stator main body 4 is axially provided with a second installation groove 41, the opening of the second installation groove 41 faces the rotor core 2, the stator core 5 is embedded in the second installation groove 41, and the stator core 5 is adhesively bonded to the second installation groove 41 by glue.

[0043] Refer to Figure 1-4, the second circuit structure 6 is a flexible circuit. The second circuit structure 6 is installed on the side of the stator core 5 facing the first circuit structure 3. The second circuit structure 6 can receive electrical signals and can also send electrical signals outward. The second circuit structure 6 is spaced apart from the first circuit structure 3, and the second circuit structure 6 is communicatively connected to the first circuit structure 3. The rotor body 1 is riveted to the rotating shaft 7 by a pin to form an integral body. The rotating shaft 7 sequentially passes through the rotor core 2, the first circuit structure 3, the second circuit structure 6, the stator core 5, and the stator body 4. The rotor core 2 is adhesively bonded to the rotating shaft 7. Among them, the rotor core 2 and the stator core 5 are hollow structures to facilitate the passing of the rotating shaft 7. A bearing is sleeved on the rotating shaft 7. The rotating shaft 7 is connected to the inner ring of the bearing, and the stator body 4 is connected to the outer ring of the bearing. The rotating shaft 7 does not drive the stator body 4 to rotate. When the rotating shaft 7 rotates, the rotor body 1, the rotor core 2, and the first circuit structure 3 rotate accordingly, while the stator core 5, the second circuit structure 6, and the stator body 4 are relatively stationary. When the resolver works, the rotating shaft 7 drives the stator body 4 to rotate. The first circuit structure 3 transmits signals to the second circuit structure 6 by electromagnetic coupling in the electromagnetic field generated by the cooperation of the rotor core 2 and the stator core 5. The second circuit structure 6 then transmits the signals to the external circuit, thereby realizing separated signal conversion and transmission.

[0044] By arranging the second circuit structure 6 at an interval from the first circuit structure 3, the rotating shaft 7 is used to drive the rotor core 2 to rotate relative to the stator core 5, so that the first circuit structure 3 rotates relative to the second circuit structure 6. The first circuit structure 3 can transmit signals to the second circuit structure 6 by electromagnetic coupling in the electromagnetic field, thereby realizing separated signal conversion and transmission. Moreover, since the first circuit structure 3 and the second circuit structure 6 are flexible circuits, compared with the traditional cable-type windings, the loss and cost can be effectively reduced, and it is also convenient to install the first circuit structure 3 on the rotor core 2 and the second circuit structure 6 on the stator core 5.

[0045] Figure 5 is a schematic structural diagram of the rotor core shown in the embodiment of the present application; Figure 6 is a schematic structural diagram of the first circuit structure shown in the embodiment of the present application; Figure 7 is another schematic structural diagram of the first circuit structure shown in the embodiment of the present application.

[0046] See Figure 3 、 Figure 5 、 Figure 6 and Figure 7, the resolver further includes an adapter board 81, a first extension wire 82 and a first extension arm 83. The adapter board 81 is adhesively bonded to the rotor body 1 by glue. The adapter board 81 can be a PCBA board. Preferably, the adapter board 81 is installed on the side of the rotor body 1 facing away from the stator body 4. The first circuit structure 3 includes a first winding and a first substrate 33. The first substrate 33 is made of polyimide or polyester film. The first extension arm 83 and the first substrate 33 are made of insulating materials. The first substrate 33 is annular. The rotating shaft 7 passes through the center of the first substrate 33. The rotor core 2 is provided with a first through hole 22. The first through hole 22 extends along the axial direction of the rotor core 2. One end of the first extension arm 83 is connected to the first substrate 33, and the other end of the first extension arm 83 passes through the first through hole 22 and is connected to the adapter board 81. The first winding is installed on the first substrate 33. The first winding can be powered on, receive signals or send signals. The first extension wire 82 is made of metal. The first extension wire 82 is located on the first extension arm 83. One end of the first extension wire 82 is electrically connected to the first winding, and the other end of the first extension wire 82 is electrically connected to the adapter board 81. Electrical signals can be transmitted between the adapter board 81, the first winding and the first extension wire 82. By providing the adapter board 81 on the rotor body 1, the first circuit structure 3 is connected to the adapter board 81 through the first extension arm 83. The adapter board 81 can be communicatively connected to an external device, thereby realizing signal transmission between the first circuit structure 3 and the external device. And since the first extension arm 83 passes through the rotor core 2, the first extension arm 83 does not occupy the external space of the rotor core 2, reducing the volume of the resolver.

[0047] See Figure 5-7, the first winding includes at least two first conductive rings 31 with different diameters and at least one first connecting wire 32. Each first conductive ring 31 is provided with a first break 311. The first conductive ring 31 is generally C-shaped, and a plurality of first breaks 311 are located on the same straight line. Two adjacent first conductive rings 31 are electrically connected through the first connecting wire 32. The first connecting wire 32 is radially inclined relative to the first conductive ring 31, and the first connecting wire 32 straddles the first break 311. The number of turns of the first winding can be two turns, three turns, four turns, and five turns. The larger the surface area of the first winding, the smaller the signal loss of electromagnetic coupling transmission. Preferably, when the surface area of the first winding accounts for 20% - 80% of the total surface area of the first substrate 33, the signal loss is within the acceptable range of product application. When the number of turns of the first winding is three turns, there are three first conductive rings 31 and two first connecting wires 32, and the extending directions of the two first connecting wires 32 are parallel to each other. One end of the first substrate 33 corresponding to the innermost first conductive ring 31 is provided with a first inner through hole 331, and the first extension wire 82 passes through the first inner through hole 331 and is electrically connected to one end of the innermost first conductive ring 31. One end of the first substrate 33 corresponding to the outermost first conductive ring 31 is provided with a first outer through hole 332, and the first extension wire 82 passes through the first outer through hole 332 and is electrically connected to one end of the outermost first conductive ring 31. By arranging the first conductive rings 31 on the first substrate 33 in a winding manner with radially equidistant circular rings, and connecting adjacent first conductive rings 31 through the first connecting wires 32 with a certain slope straddling the first breaks 311, the insertion loss can be effectively reduced.

[0048] Figure 8 is a schematic structural diagram of the second circuit structure shown in the embodiments of the present application.

[0049] See Figure 2 and Figure 8, the resolver further includes a circuit board 91, a second extension wire, and a second extension arm 93. The circuit board 91 is installed on the stator body 4. The circuit board 91 can be a PCBA board. Preferably, the circuit board 91 is installed on the side of the stator body 4 facing away from the rotor body 1. The second circuit structure 6 includes a second winding and a second substrate 63. The second substrate 63 is made of polyimide or polyester film. The second extension arm 93 and the second substrate 63 are made of insulating materials. The second substrate 63 is circular. The rotating shaft 7 passes through the center of the second substrate 63. The stator core 5 is provided with a second through hole. The second through hole extends along the axial direction of the stator core 5. One end of the second extension arm 93 is connected to the second substrate 63, and the other end of the second extension arm 93 passes through the stator core 5 and is connected to the circuit board 91. The second winding is installed on the second substrate 63. The second winding can be powered on, receive signals, or send signals. The second extension wire is made of metal. The second extension wire is located on the second extension arm 93. One end of the second extension wire is electrically connected to the second winding, and the other end of the second extension wire is electrically connected to the circuit board 91. Electrical signals can be transmitted between the circuit board 91, the second winding, and the second extension wire. By providing the circuit board 91 on the stator body 4, the second circuit structure 6 is connected to the circuit board 91 through the second extension arm 93. The circuit board 91 can be communicatively connected to an external device, thereby realizing signal transmission between the second circuit structure 6 and the external device. Moreover, since the second extension arm 93 passes through the stator core 5, the second extension arm 93 does not occupy the external space of the stator core 5, reducing the volume of the resolver.

[0050] See Figure 8, the second winding includes at least two second conductive rings 61 with different diameters and at least one second connecting wire 62. Each second conductive ring 61 is provided with a second break 611. The second conductive ring 61 is generally C-shaped. A plurality of second breaks 611 are located on the same straight line. Adjacent two second conductive rings 61 are electrically connected through the second connecting wire 62. The second connecting wire 62 is radially inclined relative to the second conductive ring 61, and the second connecting wire 62 straddles the second break 611. The number of turns of the second winding can be two turns, three turns, four turns, and five turns. The larger the surface area of the second winding, the smaller the signal loss of electromagnetic coupling transmission. Preferably, when the surface area of the second winding accounts for 20% - 80% of the total surface area of the second substrate 63, the signal loss is within the acceptable range of product application. When the number of turns of the second winding is three turns, there are three second conductive rings 61 and two second connecting wires 62. The extending directions of the two second connecting wires 62 are parallel to each other. One end of the second substrate 63 corresponding to the innermost second conductive ring 61 is provided with a second inner through hole 631. The second extension wire passes through the second inner through hole 631 and is electrically connected to one end of the innermost second conductive ring 61. One end of the second substrate 63 corresponding to the outermost second conductive ring 61 is provided with a second outer through hole 632. The second extension wire passes through the second outer through hole 632 and is electrically connected to one end of the outermost second conductive ring 61. By arranging the second conductive rings 61 in a radial equidistant circular ring distribution on the second substrate 63 and connecting adjacent second conductive rings 61 through the second connecting wires 62 with a certain slope straddling the second breaks 611, the insertion loss can be effectively reduced.

[0051] See Figure 2 , on the side of the stator core 5 facing the rotor core 2, a stator groove is provided. The second circuit structure 6 is embedded in the stator groove. The outer surface of the second circuit structure 6 is flush with the side of the stator core 5 facing the rotor core 2. By providing the stator groove to accommodate the second circuit structure 6, the occupied space of the second circuit structure 6 can be saved. And the fact that the outer surface of the second circuit structure 6 is flush with the side of the stator core 5 facing the rotor core 2 helps to adjust the distance between the second circuit structure 6 and the first circuit structure 3. Just by detecting the distance between the stator core 5 and the rotor core 2, the distance between the second circuit structure 6 and the first circuit structure 3 can be known.

[0052] See Figure 2 and Figure 5, on the side of the rotor core 2 facing the stator core 5, a rotor groove 21 is formed. The first circuit structure 3 is embedded in the rotor groove 21, and the outer surface of the first circuit structure 3 is flush with the side of the rotor core 2 facing the stator core 5. By forming the rotor groove 21 to accommodate the first circuit structure 3, the occupied space of the first circuit structure 3 is saved. Moreover, the fact that the outer surface of the first circuit structure 3 is flush with the side of the rotor core 2 facing the stator core 5 helps to adjust the distance between the first circuit structure 3 and the second circuit structure 6. Just by detecting the distance between the rotor core 2 and the stator core 5, the distance between the second circuit structure 6 and the first circuit structure 3 can be known. Since too deep a rotor groove 21 or stator groove will cause the magnetic path length between the second circuit structure 6 and the first circuit structure 3 to become longer and the loss to become larger, in this application, the depth of the rotor groove 21 is less than or equal to 0.5 mm, and the loss can be minimized as much as possible while ensuring that the rotor core 2 and the rotor groove 21 can be tightly combined; the depth of the stator groove is less than or equal to 0.5 mm, and the loss can be minimized as much as possible while ensuring that the stator core 5 and the stator groove can be tightly combined. Preferably, the depths of the stator groove and the rotor groove 21 are kept the same. The distance between the rotor core 2 and the stator core 5 is less than or equal to 0.5 mm. The smaller the air gap between the end faces when the rotor core 2 and the stator core 5 cooperate, the smaller the magnetic path loss. The air gap between the rotor core 2 and the stator core 5 does not exceed 0.5 mm, and a good signal transmission effect can be obtained for the resolver used in the intravascular ultrasound product.

[0053] See Figure 2 , for the magnetic core material of the resolver for signal transmission, soft magnetic ferrite is generally selected. Soft magnetic ferrite mainly includes two major series: manganese-zinc ferrite and nickel-zinc ferrite. Manganese-zinc ferrite is suitable for operating at frequencies below 3 MHz, and nickel-zinc ferrite is suitable for the frequency range of 1 MHz to 1000 MHz. The clinical application frequency of the intravascular ultrasound system is usually between 1 MHz and several hundred MHz. Therefore, the rotor core 2 and the stator core 5 of the present invention are made of nickel-zinc ferrite, and good temperature stability and small high-frequency loss effects can be obtained.

[0054] Corresponding to the foregoing application function implementation device embodiments, the present application also provides an intravascular ultrasound device and corresponding embodiments.

[0055] Figure 9 is a schematic structural diagram of the intravascular ultrasound device shown in the embodiments of the present application; Figure 10 is a cross-sectional view of the retraction motor shown in the embodiments of the present application.

[0056] See Figure 2 , Figure 9 and Figure 10, the intravascular ultrasound device includes a diagnostic catheter 100 and a retraction motor 200. The retraction motor 200 realizes the physical and mechanical functions of the rotation and retraction movements of the diagnostic catheter 100, and serves as the communication hub for establishing the communication between the image signal of the diagnostic catheter 100 and the signal of the imaging host. The retraction motor 200 includes an unlocking assembly 201, a motor 202, a base 203, a joint 204, a first coupling 205, a second coupling 206, a transmission shaft 207, and a resolver. The diagnostic catheter 100 is inserted into the interior of the retraction motor 200 along the inner hole of the unlocking assembly 201. The outer shell of the diagnostic catheter 100 is locked or unlocked by the unlocking assembly 201. The joint 204 is adhesively bonded to the rotor body 1. The internal signal link of the diagnostic catheter 100 is connected to the joint 204 through the connector of the diagnostic catheter 100. The rear end of the joint 204 is electrically connected to the adapter plate 81 through a coaxial cable. The adapter plate 81 is electrically connected to the first winding, so that a loop communication is formed in the circuit between the diagnostic catheter 100 and the first circuit structure 3. The first winding transfers the signal to the second winding through electromagnetic coupling in the electromagnetic field generated by the cooperation of the rotor core 2 and the stator core 5. The second circuit structure 6 then transfers the signal to the circuit board 91, thus realizing the communication with the host data system. The first coupling 205 is respectively connected to the motor 202 and the transmission shaft 207. The second coupling 206 is respectively connected to the transmission shaft 207 and the rotating shaft 7. The motor 202 sequentially transfers the rotational movement to the transmission shaft 207 and the rotating shaft 7. The rotor body 1 rotates as the rotating shaft 7 rotates, and the rotor body 1 drives the diagnostic catheter 100 to rotate together. The stator body 4 is fixed to the base 203 by set screws.

[0057] The solution of the present application has been described in detail with reference to the accompanying drawings above. In the above embodiments, the descriptions of the various embodiments have their own emphases. For the parts not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments. Those skilled in the art should also be aware that the actions and modules involved in the specification are not necessarily essential to the present application. In addition, it can be understood that the steps in the method embodiments of the present application can be adjusted, combined, and deleted according to actual needs, and the modules in the device embodiments of the present application can be combined, divided, and deleted according to actual needs.

[0058] The various embodiments of the present application have been described above. The above description is exemplary and not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations are obvious to those of ordinary skill in the art in the technical field without departing from the scope and spirit of the described embodiments. The selection of the terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technologies in the market, or to enable other ordinary skilled persons in the technical field to understand the embodiments disclosed herein.

Claims

1. A resolver, characterized in that, Comprising: Rotor body; Rotor core, which is mounted on the rotor body; First circuit structure, which is mounted on the side of the rotor core facing away from the rotor body; Stator body; the stator body is located on the side of the rotor core facing away from the rotor body; Stator core, which is mounted on the stator body; Second circuit structure, which is mounted on the side of the stator core facing the first circuit structure. The first circuit structure and the second circuit structure are flexible circuits. The second circuit structure is spaced from the first circuit structure and is communicatively connected to the first circuit structure; Rotating shaft, which is fixed to the rotor body. The rotating shaft sequentially passes through the rotor core, the first circuit structure, the second circuit structure, the stator core and the stator body.

2. The resolver according to claim 1, wherein: It further includes an adapter board, a first extension wire and a first extension arm. The adapter board is mounted on the rotor body. The first circuit structure includes a first winding and a first substrate. One end of the first extension arm is connected to the first substrate, and the other end of the first extension arm passes through the rotor core and is connected to the adapter board. The first winding is mounted on the first substrate. The first extension wire is located on the first extension arm. One end of the first extension wire is electrically connected to the first winding, and the other end of the first extension wire is electrically connected to the adapter board.

3. The resolver according to claim 2, wherein: The first winding includes at least two first conductive rings with different diameters and at least one first connecting wire. Each first conductive ring is provided with a first break. A plurality of the first breaks are located on the same straight line. Adjacent two first conductive rings are electrically connected by the first connecting wire, and the first connecting wire straddles the first break.

4. The resolver according to claim 1, wherein: It further includes a circuit board, a second extension wire and a second extension arm. The circuit board is mounted on the stator body. The second circuit structure includes a second winding and a second substrate. One end of the second extension arm is connected to the second substrate, and the other end of the second extension arm passes through the stator core and is connected to the circuit board. The second winding is mounted on the second substrate. The second extension wire is located on the second extension arm. One end of the second extension wire is electrically connected to the second winding, and the other end of the second extension wire is electrically connected to the circuit board.

5. The resolver according to claim 4, wherein: The second winding includes at least two second conductive rings with different diameters and at least one second connecting wire. Each second conductive ring is provided with a second break. A plurality of the second breaks are located on the same straight line. Adjacent two second conductive rings are electrically connected by the second connecting wire, and the second connecting wire straddles the second break.

6. The resolver according to claim 1, wherein: A stator groove is formed on the side of the stator core facing the rotor core. The second circuit structure is embedded in the stator groove, and the outer surface of the second circuit structure is flush with the side of the stator core facing the rotor core.

7. The resolver according to claim 1, characterized in that: One side of the rotor core facing the stator core is provided with a rotor groove, the first circuit structure is embedded in the rotor groove, and the outer surface of the first circuit structure is flush with the side of the rotor core facing the stator core.

8. The resolver according to claim 7, wherein: The depth of the rotor groove is less than or equal to 0.5 mm.

9. The resolver according to claim 1, characterized in that: The distance between the rotor core and the stator core is less than or equal to 0.5 mm.

10. The resolver according to claim 1, characterized in that: The rotor core and the stator core are made of nickel-zinc ferrite.

11. An intravascular ultrasound device, characterized in that, It includes a motor, a base, a connector, a diagnostic catheter and a resolver according to any one of claims 1-10. The motor drives the rotation shaft to rotate, the stator body is fixed to the base, the connector is installed on the rotor body, the diagnostic catheter is connected to the connector, and the first circuit structure is communicatively connected to the diagnostic catheter through the connector.

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