An IVUS and a catheter thereof

Abstract

The present invention discloses an IVUS and a catheter thereof, wherein the catheter comprises a sheath and an adapter, the adapter comprises a housing for connecting to a socket of a controller and a rotating part in the housing, the rotating part is driven by the socket and drives the driving shaft in the sheath to rotate, thereby driving the ultrasonic transducer to rotate for signal acquisition. An anti-interference circuit is also provided in the rotating part, and the ultrasonic transducer transmits the collected signal to the anti-interference circuit through a signal line, and the anti-interference circuit transmits the signal to the controller for signal processing. It can be seen that the anti-interference circuit in the present application is arranged inside the catheter, and rotates simultaneously with the rotating part in the catheter. Due to the small diameter of the catheter, the Q value of the material through which the signal is conducted is low, and the surface area is small, so the corresponding parasitic capacitance is small, which greatly reduces the risk of introducing parasitic capacitance into the controller. Relative to the prior art, the technical solution of the present application can significantly improve the isolation effect of interference signals.

Description

Technical Field

[0001] The present invention relates to the technical field of signal processing, and in particular to an IVUS and a catheter thereof. Background Art

[0002] IVUS is the abbreviation of intravascular ultrasound echo imaging system, which is used to detect blood vessels in the human body and is widely used in the medical field. Figure 1 A schematic diagram of the structure of an IVUS provided by the prior art. The IVUS mainly includes a host 1, a controller 2, and a catheter 3, wherein one end of the catheter 3 is connected to the controller 2, and the controller 2 is connected to the host 1 through a transmission line, and is used to process the echo signal collected by the ultrasonic transducer, thereby achieving diagnosis. The controller 2 mainly includes a motor, a power supply, and a signal processing circuit (for example, signal amplification, signal analysis and processing, etc.). In a specific implementation, the connection between the catheter and the controller is achieved through an adapter on the catheter. Figure 2 The schematic diagram of the structure of a catheter provided by the prior art. Figure 2 As shown, the catheter 3 includes a sheath tube 30, a drive shaft 31 and a signal line 32 in the sheath tube 30, an ultrasonic transducer (not shown in the figure) and an adapter, wherein the adapter includes a housing 33, a rotating part 34, and a catheter pin 35. The ultrasonic transducer is arranged in the sheath tube, and is at one end away from the controller. The drive shaft is usually two double-layer spring tubes, one large and one small, nested together, and their winding directions are opposite. The smaller spring tube contains two signal lines in the middle, one end of the two signal lines is connected to the ultrasonic transducer, and the other end is connected to the catheter pin to connect to the controller. The housing has a structure that matches the socket of the controller to achieve a fixing effect. The rotating part is connected to a rotating shaft driven by the motor in the controller, and rotates under the drive of the motor, thereby driving the drive shaft to rotate to realize the rotation of the ultrasonic transducer.

[0003] Since the catheter is inserted into the human body for too long (more than 1 meter), the signal interference caused by it is very serious. In addition, due to the safety requirements of cardiac equipment, the leakage current is less than 10uA, which further increases the difficulty of signal interference resistance. In addition, since it is rotating at a speed of 30 / s, the IVUS image interference problem is very serious.

[0004] In the prior art, in order to reduce signal interference, measures generally taken are to add an interference suppression circuit to the signal processing circuit in the controller, or to add an isolation device to the rotary transformer, etc. Although the above measures can reduce signal interference and thus improve image quality, the improvement effect is limited. Summary of the invention

[0005] The purpose of the present invention is to provide an IVUS catheter for connecting an ultrasonic transducer and a controller, so as to transmit the signal collected by the ultrasonic transducer to the controller for signal analysis. The catheter is provided with an anti-interference circuit inside, which greatly reduces the risk of introducing parasitic capacitance into the controller and significantly improves the isolation effect of interference signals. In addition, the purpose of the present invention is to provide an IVUS including the catheter.

[0006] In order to solve the above technical problems, the present invention provides an IVUS catheter, including a sheath 30 and an adapter, the adapter including a shell 33 for connecting the sheath 30 to the socket of the controller 2 and a rotating part 34 in the shell 33, the rotating part 34 is driven by the socket and drives the driving shaft 31 in the sheath 30 to rotate; it is characterized in that an anti-interference circuit 36 ​​is arranged in the rotating part 34, one end of the anti-interference circuit 36 ​​is electrically connected to the ultrasonic transducer through a signal line 32, and the other end of the anti-interference circuit 36 ​​is electrically connected to the socket.

[0007] Preferably, the anti-interference circuit 36 ​​includes a resonant structure composed of a common-mode inductor and a capacitor, the common-mode inductor is electrically connected to the signal line 32 and the capacitor respectively, and the capacitor is electrically connected to the socket.

[0008] Preferably, the capacitor includes a first capacitor and a second capacitor, the first capacitor and a first inductor in the common mode inductor form a series resonance, and the second capacitor and a second inductor in the common mode inductor form a series resonance.

[0009] Preferably, the anti-interference circuit 36 ​​further includes a third capacitor, and the third capacitor is electrically connected to the common-mode inductor through the first capacitor and the second capacitor.

[0010] Preferably, the third capacitor is specifically an ultra-high frequency capacitor.

[0011] Preferably, there are two resonant structures, which are connected in series to form a secondary series resonance.

[0012] Preferably, the common end of the third capacitor, the first capacitor and the second capacitor is electrically connected to the socket via a catheter pin 35.

[0013] Preferably, the anti-interference circuit 36 ​​also includes a double-sided circuit board 361, the common-mode inductor and the third capacitor are arranged on one side of the double-sided circuit board, the third capacitor is placed in the annular magnetic core 360 ​​of the common-mode inductor, and the first capacitor and the second capacitor are arranged on the other side of the double-sided circuit board 361.

[0014] Preferably, the double-sided circuit board 361 is an epoxy board made of FR4 material.

[0015] In order to solve the above technical problems, the present invention provides an IVUS, including a host 1, a controller 2, and the IVUS catheter.

[0016] The catheter applied to IVUS provided by the present invention includes a sheath and an adapter, and the adapter includes a housing for connecting to the socket of the controller and a rotating part in the housing, and the rotating part is driven by the socket and drives the drive shaft in the sheath to rotate, thereby driving the ultrasonic transducer to rotate for signal acquisition. An anti-interference circuit is also provided in the rotating part, and the ultrasonic transducer transmits the collected signal to the anti-interference circuit through a signal line, and the anti-interference circuit transmits the signal to the controller for signal processing. It can be seen that the anti-interference circuit in the present application is arranged inside the catheter, and rotates simultaneously with the rotating part in the catheter. Due to the small diameter of the catheter, the Q value of the material through which the signal is conducted is low, and the surface area is small, so the corresponding parasitic capacitance is small, which greatly reduces the risk of introducing parasitic capacitance into the controller. Relative to the prior art, the technical solution of the present application can significantly improve the isolation effect of the interference signal.

[0017] In addition, IVUS applied to the catheter provided in the present application also has the above-mentioned beneficial effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 A schematic diagram of the structure of an IVUS provided by the prior art;

[0020] Figure 2 A schematic diagram of the structure of a catheter provided by the prior art;

[0021] Figure 3 A structural diagram of an IVUS catheter provided by an embodiment of the present invention;

[0022] Figure 4 A schematic diagram of an anti-interference circuit provided by an embodiment of the present invention;

[0023] Figure 5 A waveform diagram of antenna effect interference provided by an embodiment of the present invention;

[0024] Figure 6 This is a signal waveform diagram after adopting the anti-interference circuit provided by the present invention;

[0025] Figure 7 A schematic diagram of another anti-interference circuit provided in an embodiment of the present invention.

[0026] The figure numbers are as follows: 1 is the host, 2 is the controller, 3 is the catheter, 30 is the sheath, 31 is the drive shaft, 32 is the signal line, 33 is the housing, 34 is the rotating part, 35 is the catheter needle, 36 is the anti-interference circuit, 360 is the annular magnetic core, 361 is the double-sided circuit board, L1 is the first inductor, L2 is the second inductor, L3 is the third inductor, L4 is the fourth inductor, C1 is the first capacitor, C2 is the second capacitor, C3 is the third capacitor, C4 is the fourth capacitor, and C5 is the fifth capacitor. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] The core of the present invention is to provide an IVUS and a catheter thereof.

[0029] In order to enable those skilled in the art to better understand the scheme of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0030] Figure 3 FIG. 1 is a structural diagram of an IVUS catheter provided in an embodiment of the present invention. Figure 3 As shown, the catheter 3 includes a sheath 30 and an adapter, the adapter includes a shell 33 for connecting the sheath 30 to the socket of the controller 2 and a rotating part 34 in the shell 33, the rotating part 34 is driven by the socket and drives the driving shaft 31 in the sheath 30 to rotate, wherein an anti-interference circuit 36 ​​is arranged in the rotating part 34, one end of the anti-interference circuit 36 ​​is electrically connected to the ultrasonic transducer through the signal line 32, and the other end of the anti-interference circuit 36 ​​is electrically connected to the socket.

[0031] In this embodiment, the drive shaft 31 and the ultrasonic transducer are located in the sheath tube. When the staff needs to collect the signal of the blood vessel in the human body, the sheath tube 30 is inserted into the blood vessel. Since the outer wall of the sheath tube 30 is smooth, and the drive shaft 31 and the ultrasonic transducer are inside the sheath tube 30, even if the drive shaft 31 and the ultrasonic transducer rotate in the sheath tube 30, they will not directly act on the blood vessel wall to avoid damaging the blood vessel. In addition, the sheath tube 30 can also protect the drive shaft 31 from being damaged by bending. Usually, the sheath tube 30 is made of polymer material. It can be understood that the present invention does not limit the diameter of the sheath tube 30. Considering the reduction of damage to the blood vessel, the sheath tube 30 should be as thin as possible. However, since the drive shaft 31 and the ultrasonic transducer need to be installed in the sheath tube 30, its diameter will also be limited. In a specific embodiment, the diameter of the sheath tube 30 can be 1 mm. Of course, this is only a specific implementation method and does not mean that only this parameter can be selected.

[0032] In a specific implementation, the connection between the catheter 3 and the controller 2 is achieved through an adapter on the catheter 3, and the two ends of the catheter 3 are the ultrasonic transducer and the adapter respectively. Specifically, the housing 33 of the adapter is connected to the socket in the controller 2 to achieve the purpose of fixation. The controller 2 includes a motor, which drives a connecting shaft, and the shaft has a plug for connecting with the rotating part 34 of the adapter. When the motor rotates, the connecting shaft will also rotate, thereby driving the rotating part 34 to rotate synchronously, and the rotating part 34 then drives the driving shaft 31 to rotate, so that the ultrasonic transducer can rotate in the sheath 30 to collect corresponding signals.

[0033] Since the echo signal collected by the ultrasonic transducer needs to be transmitted to the controller 2 through the signal line 32, and finally transmitted to the host 1 for signal analysis, how to reduce the interference signal entering the controller 2 is the premise to ensure accurate signal analysis. In order to solve this problem, in this embodiment, the anti-interference circuit 36 ​​is set at the front end of the controller 2, that is, as mentioned above, the anti-interference circuit 36 ​​is set in the adapter, and before the signal line 32 transmits the signal to the controller 2, it first passes through the anti-interference circuit 36, and then transmits the signal to the controller 2. In addition, the anti-interference circuit 36 ​​is set in the rotating part 34 in the catheter 3, and rotates simultaneously with the rotating part, and the diameter of the catheter 3 is small, so that the material through which the signal is transmitted has a low Q value and a small surface area, so the corresponding parasitic capacitance is small, which greatly reduces the risk of introducing parasitic capacitance into the controller. It can be understood that the types of signal interference are divided into common-mode interference, differential-mode interference, antenna effect interference, etc. Therefore, the corresponding anti-interference circuit 36 ​​can be an anti-interference circuit for common-mode interference, an anti-interference circuit for differential-mode interference, or an anti-interference circuit for antenna effect interference, etc. This embodiment does not limit the type of anti-interference circuit.

[0034] In addition, in order to further improve the anti-interference capability, a bandpass filter may be connected to the rear end of the rotary transformer in the controller 2, which will not be described in detail in the present invention.

[0035] The catheter for IVUS provided in the present embodiment includes a sheath and an adapter, and the adapter includes a housing for connecting to the socket of the controller and a rotating part in the housing, and the rotating part is driven by the socket and drives the drive shaft in the sheath to rotate, thereby driving the ultrasonic transducer to rotate for signal acquisition. An anti-interference circuit is also provided in the rotating part, and the ultrasonic transducer transmits the collected signal to the anti-interference circuit through a signal line, and the anti-interference circuit transmits the signal to the controller for signal processing. It can be seen that the anti-interference circuit in the present application is arranged inside the catheter, and rotates simultaneously with the rotating part in the catheter. Due to the small diameter of the catheter, the Q value of the material through which the signal is conducted is low, and the surface area is small, so the corresponding parasitic capacitance is small, which greatly reduces the risk of introducing parasitic capacitance into the controller. Relative to the prior art, the technical solution of the present application can significantly improve the isolation effect of the interference signal.

[0036] Figure 4 A schematic diagram of an anti-interference circuit provided in an embodiment of the present invention. Based on the above embodiment, as a preferred implementation, the anti-interference circuit 36 ​​includes a resonant structure composed of a common mode inductor and a capacitor, the common mode inductor is electrically connected to the signal line 32 and the capacitor respectively, and the capacitor is electrically connected to the socket.

[0037] In this embodiment, the anti-interference circuit 36 ​​specifically includes a common mode inductor and a capacitor.

[0038] The common-mode inductor is used to suppress common-mode interference and antenna effect interference. The common-mode inductor is two inductors wound in opposite directions on the same annular magnetic core 360 ​​.

[0039] Specific working principle:

[0040] 1) Suppress common mode interference

[0041] The first inductor L1 and the second inductor L2 are wound in opposite directions, which can offset the inductive reactance generated by the normal signal, and the inductive reactance is zero, so the normal signal is not affected. When the interference signal is a common mode signal, it is the result of the interaction between data+ / data- and GND, so the first inductor L1 and the second inductor L2 have a very strong inhibitory effect on it.

[0042] 2) Suppress antenna effect interference;

[0043] Antenna effect interference means that when the conductor length is equal to 1 / 4 wavelength, the reception of electromagnetic waves at both ends is just at the peak and trough of the wave, and a large number of interference signals can be gathered at this time, seriously affecting the transmission of normal signals. Figure 1As shown, the catheter 3 is connected to the host 1, and the host 1 is connected to the external power grid. The external power grid is a very long wire that can reach hundreds of kilometers. The entire wire forms a receiving mechanism for electromagnetic interference waves within its length. Figure 5 A waveform diagram of antenna effect interference provided by an embodiment of the present invention, such as Figure 5 As shown, the horizontal axis is the time axis and the vertical axis is the amplitude value. The signal is submerged in the interference signal and cannot be extracted. In this embodiment, the first inductor L1 and the second inductor L2 block the connection between the catheter 3 and the host 1 and the external power grid. For AC signals, the inductance is equal to the open circuit, thereby limiting the wavelength to the effective conductor length of the catheter. In a specific embodiment, the catheter length is 1.6 meters, of which the conductor length is 1.2 meters, then: 1.2 meters * 4 = 4.8 meters. Interference with a wavelength below can be received, thereby greatly reducing the interference bandwidth. According to the formula f = v / s, it can be obtained that the frequency 3*108 / 4.8 = 62.5MHz and above can produce an antenna effect, and the higher the frequency, the greater the attenuation during transmission. At frequencies above 60.5MHz, the electromagnetic wave intensity in space is already very low, which shields most of the strong interference outside the circuit.

[0044] The common-mode inductor and capacitor form a resonant structure. By setting the resonant frequency, i.e., the selected passing frequency, the signal of the selected working frequency of the ultrasonic transducer can pass through better, and the signals (noise) of other frequencies are severely attenuated when passing through. In this embodiment, there is no limitation on the connection method of the common-mode inductor and capacitor. They can be electrically connected through a wire or through a circuit board. It is understandable that the method of electrical connection through a circuit board has high reliability and is not easy to fall off or disconnect. The circuit board can be a PCB, which is not limited by the present invention.

[0045] Furthermore, the capacitor includes a first capacitor C1 and a second capacitor C2, the first capacitor C1 and the first inductor L1 in the common mode inductor form a series resonance, and the second capacitor C2 and the second inductor L2 in the common mode inductor form a series resonance. Figure 4 As shown, data+ and data- are common paths for the PULSE signal line and the echo signal line. The first end of the first inductor L1 and the first end of the second inductor L2 are used as two ends of the anti-interference circuit 36 ​​to connect to the ultrasonic transducer, the second end of the first inductor L1 is connected to the first end of the first capacitor C1, and the second end of the second inductor L2 is connected to the first end of the second capacitor C2. When the capacitive reactance of the first capacitor C1 is equal to the inductive reactance of the first inductor L1, the first capacitor C1 and the first inductor L1 resonate, and when the capacitive reactance of the second capacitor C2 is equal to the inductive reactance of the second inductor L2, the second capacitor C2 and the second inductor L2 resonate, and the signal frequency during resonance is:

[0046] Among them, L is the inductive reactance and C is the capacitive reactance.

[0047] For ease of understanding, the present invention provides Figure 4 Each device and Figure 3 The corresponding relationship, Figure 4 The first inductor L1 and the second inductor L2 are wound in opposite directions to form Figure 3 The annular magnetic core 360 ​​in.

[0048] When the anti-interference circuit 36 ​​is working, the first inductor L1 and the first capacitor C1 form a series resonant frequency selector, and the second inductor L2 and the second capacitor C2 form a series resonant circuit frequency selector of the same frequency, which selects the frequency of the composite signal of the normal signal and the interference signal, and the resonance point is exactly the working frequency. In this way, in addition to the normal signal, other interference signals are filtered out again.

[0049] Figure 6 The signal waveform diagram after using the anti-interference circuit provided by the present invention is as follows: Figure 6 As shown, the horizontal axis is the time axis and the vertical axis is the amplitude value. It can be seen that the interference signal is resisted, and the normal echo signal is not affected, maintaining the original amplitude, which can be clearly highlighted from the clutter and can be easily identified by the host algorithm.

[0050] In this embodiment, the anti-interference circuit includes a common-mode inductor and a capacitor, wherein the common-mode inductor can eliminate common-mode interference signals, and the series resonance formed by the common-mode inductor and the capacitor can eliminate differential-mode interference signals.

[0051] Furthermore, the anti-interference circuit further includes a third capacitor C3, and the third capacitor C3 is electrically connected to the common mode inductor through the first capacitor C1 and the second capacitor C2.

[0052] like Figure 4 As shown, the second end of the first capacitor C1 is connected to the first end of the third capacitor C3, the second end of the second capacitor C2 is connected to the second end of the third capacitor C3, and the common end of the first capacitor C1 and the third capacitor C3 and the common end of the second capacitor C2 and the third capacitor C3 are divided as the output end of the anti-interference circuit. In a specific implementation, the capacitance of the third capacitor C3 is much smaller than the capacitance of the first capacitor C1 and the second capacitor C2. The third capacitor C3 is used to short-circuit the AC signal, and the signal greater than the resonant frequency cannot pass through, playing a role of a low-pass filter. As a preferred implementation, the third capacitor C3 is specifically an ultra-high frequency capacitor.

[0053] Figure 7 FIG. 1 is a schematic diagram of another anti-interference circuit provided by an embodiment of the present invention. Figure 7 As shown, based on the previous embodiment, as a preferred implementation, there are two resonant structures, which are connected in series to form a secondary series resonance, that is, Figure 7 Relative to Figure 4In terms of the embodiment, there are two sets of series resonances, the first inductor L1 and the first capacitor C1 are connected in series, the second inductor L2 and the second capacitor C2 are connected in series to form a series resonance, the third inductor L3 and the fourth capacitor C4 are connected in series, and the fourth inductor L4 and the fifth capacitor C5 are connected in series to form a series resonance. As a preferred embodiment, the common end of the third capacitor C3, the first capacitor C1 and the second capacitor C2 is electrically connected to the socket through a catheter pin 35. The function of the catheter pin 35 is to transmit the PULSE signal and the echo signal to the ultrasonic transducer or the host 1. It can be understood that in addition to the connection method of the catheter pin 35, it can also be connected through other conductors as long as the signal transmission can be achieved.

[0054] In a specific implementation, the larger the size of the common-mode inductor, the better. However, due to the limitation of the catheter diameter, the size of the common-mode inductor cannot be too large. Figure 3 As shown, the anti-interference circuit 36 ​​also includes a double-sided circuit board 361, the common mode inductor and the third capacitor C3 are arranged on one side of the double-sided circuit board 361, the third capacitor C3 is placed in the annular core 360 ​​of the common mode inductor, and the first capacitor C1 and the second capacitor C2 are arranged on the other side of the double-sided circuit board. In this embodiment, a double-sided circuit board 361 is used, and the first capacitor C1 and the second capacitor C2 and the common mode inductor are respectively arranged on different sides of the double-sided circuit board, so that a larger size of common mode inductor can be used in a limited area. As a preferred embodiment, the double-sided circuit board 361 is specifically an FR4 material epoxy board. The FR4 material epoxy board has good mechanical properties, dimensional stability, impact resistance, and moisture resistance, and excellent electrical properties, a high operating temperature, and its own performance is less affected by the environment. It is widely used in double-sided PCBs. It can be understood that the use of a circuit board of any material does not affect the implementation of this solution.

[0055] Finally, the present invention also provides an IVUS, which includes a host 1, a controller 2, and an IVUS catheter as described in any of the above embodiments.

[0056] Since the IVUS catheter and the connection relationship between the IVUS catheter and the controller 2 are described in detail in the above embodiment, they will not be described in detail in this embodiment.

[0057] The IVUS provided in the present embodiment includes a catheter, which includes a sheath and an adapter, and the adapter includes a housing for connecting to the socket of the controller and a rotating part in the housing, and the rotating part is driven by the socket and drives the drive shaft in the sheath to rotate, thereby driving the ultrasonic transducer to rotate for signal acquisition. An anti-interference circuit is also provided in the rotating part, and the ultrasonic transducer transmits the collected signal to the anti-interference circuit through a signal line, and the anti-interference circuit transmits the signal to the controller for signal processing. It can be seen that the anti-interference circuit in the present application is arranged inside the catheter, and rotates simultaneously with the rotating part in the catheter. Due to the small diameter of the catheter, the Q value of the material through which the signal is conducted is low, and the surface area is small, so the corresponding parasitic capacitance is small, which greatly reduces the risk of introducing parasitic capacitance into the controller. Relative to the prior art, the technical solution of the present application can significantly improve the isolation effect of the interference signal.

[0058] The IVUS and catheter provided by the present invention are introduced in detail above. The various embodiments in the specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part description. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

[0059] It should also be noted that, in this specification, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the statement "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

Claims

1. An IVUS catheter, comprising a sheath tube (30) and an adapter, wherein the adapter comprises a housing (33) for connecting the sheath tube (30) to a socket of a controller (2) and a rotating portion (34) in the housing (33), wherein the rotating portion (34) is driven by the socket and drives a driving shaft (31) in the sheath tube (30) to rotate; characterized in that: An anti-interference circuit (36) is provided in the rotating portion (34), one end of the anti-interference circuit (36) is electrically connected to the ultrasonic transducer via a signal line (32), and the other end of the anti-interference circuit (36) is electrically connected to the socket; The anti-interference circuit includes a common-mode inductor and a capacitor, wherein the common-mode inductor is used to eliminate the common-mode interference signal, and the series resonance formed by the common-mode inductor and the capacitor is used to eliminate the differential-mode interference signal; The common mode inductor is two inductors wound in opposite directions on the same annular magnetic core; the capacitor includes a first capacitor and a second capacitor, the first capacitor and the first inductor in the common mode inductor form a series resonance, and the second capacitor and the second inductor in the common mode inductor form a series resonance.

2. The catheter according to claim 1, characterized in that The anti-interference circuit (36) comprises a resonant structure formed by a common-mode inductor and a capacitor, the common-mode inductor is electrically connected to the signal line (32) and the capacitor respectively, and the capacitor is electrically connected to the socket.

3. The catheter according to claim 1, characterized in that The anti-interference circuit (36) also includes a third capacitor, which is electrically connected to the common-mode inductor through the first capacitor and the second capacitor.

4. The catheter according to claim 3, characterized in that The third capacitor is specifically an ultra-high frequency capacitor.

5. The catheter according to claim 1, characterized in that The resonant structure has two components, which are connected in series to form a secondary series resonance.

6. The catheter according to claim 3, characterized in that The common end of the third capacitor, the first capacitor and the second capacitor is electrically connected to the socket via a catheter pin (35).

7. The catheter according to claim 3, characterized in that The anti-interference circuit (36) further comprises a double-sided circuit board (361), the common-mode inductor and the third capacitor being arranged on one side of the double-sided circuit board, the third capacitor being placed in the annular magnetic core (360) of the common-mode inductor, and the first capacitor and the second capacitor being arranged on the other side of the double-sided circuit board (361).

8. The catheter according to claim 7, characterized in that The double-sided circuit board (361) is specifically an FR4 epoxy board.

9. An IVUS, comprising a host (1) and a controller (2), characterized in that: Also included is the IVUS catheter described in any one of claims 1-8.

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