Multimode optical fiber slip ring assembly and optical fiber conduit control device

Abstract

The invention discloses a multimode optical fiber slip ring assembly and an optical fiber conduit control device. The multimode optical fiber slip ring assembly comprises a base; the rotor drives the prism component to rotate through the gear system; the rotor and the stator are both provided with two optical fiber collimators, optical axes of the two optical fiber collimators of the rotor and the two optical fiber collimators of the stator are both parallel to a rotating shaft of the rotor, and the distances between the optical axes and the rotating shaft are equal; the prism component is arranged between the rotor and the stator along the rotating shaft direction of the rotor, an optical filter is arranged on one optical path inlet of the two optical fiber collimators of the rotor, an optical filter is arranged on one optical path inlet of the two optical fiber collimators of the stator, and an optical filter is arranged on the other optical path inlet of the two optical fiber collimators of the stator. And the optical filter is used for passing through the ultrasonic demodulation light and cutting off the ultrasonic excitation light. Excitation light and demodulation light are compositely transmitted through double-channel optical signals, and the light demodulation function and the excitation light function can be achieved in the same machine.

Description

Technical Field

[0001] The invention relates to the technical field of all-optical ultrasonic imaging, and in particular to a multi-mode optical fiber slip ring assembly and an optical fiber catheter control device. Background Art

[0002] The all-optical ultrasonic imaging system requires high-speed rotation of the catheter assembly including the probe. The catheter assembly needs to pass one ultrasonic excitation light and one ultrasonic demodulation light in the all-optical ultrasonic imaging system, and the passage of the ultrasonic excitation light needs to be cut off on the optical fiber optical path of the ultrasonic demodulation light. The dual-channel optical signal slip ring in the prior art cannot solve the problem of crosstalk between the two optical paths. Therefore, the existing multi-channel slip ring applications that are stable in use are usually implemented using two independent single-channel optical fiber slip rings, and hardware is used for timing synchronization. This method has poor synchronization effect in high-speed rotation scanning and is prone to problems such as optical fiber entanglement.

[0003] In addition, the all-optical ultrasound imaging system also requires moving the probe along the normal direction of the probe rotation.

[0004] Therefore, there is an urgent need for a multimode optical fiber slip ring assembly and an optical fiber catheter control device that can meet the application of all-optical ultrasonic imaging and has a compact structure. Summary of the invention

[0005] In order to solve the disadvantageous problems caused by the technical solution of using two independent single-channel optical fiber slip rings proposed in the above background technology, the present invention provides the following technical solution:

[0006] A multimode optical fiber slip ring assembly is used to pass one channel of ultrasonic excitation light and one channel of ultrasonic demodulation light in an all-optical ultrasonic imaging system, comprising:

[0007] A base, wherein the base is provided with a through hole;

[0008] A rotor, the rotor is arranged in the through hole, the rotor is provided with a countersink, a stator, a gear system, and a prism component are installed in the countersink, the rotor drives the prism component to rotate through the gear system, and the gear system makes the rotation speed of the prism component and the rotor relative to the stator maintain a certain ratio value; the prism component is a prism combination that can achieve an object-image rotation ratio of a predetermined ratio;

[0009] The rotor and the stator are each provided with two optical fiber collimators, and the optical axes of the two optical fiber collimators of the rotor and the two optical fiber collimators of the stator are parallel to the rotation axis of the rotor and are equidistant from the rotation axis. When the rotor rotates to a specific angle, the two optical fiber collimators of the rotor and the two optical fiber collimators of the stator are coaxial. Along the rotation axis direction of the rotor, the prism component is provided between the rotor and the stator, and the light beams incident on the two optical fiber collimators of the stator reach the two optical fiber collimators of the rotor after passing through the prism component.

[0010] A filter is provided on the light path entrance of one of the two optical fiber collimators of the rotor, and a filter is provided on the light path entrance of one of the two optical fiber collimators of the stator. The filter is used to pass the ultrasonic demodulation light and cut off the ultrasonic excitation light.

[0011] The technical effect of the present invention is that the excitation light and the demodulation light are transmitted through the composite transmission of the dual-channel optical signal, so that the demodulation light and the excitation light functions can be implemented in the same machine, which is convenient for doctors to use and can save a machine at the same time, so that patients are spared the pain of two different examinations, which can generate great social and economic value; through the differential rotation of the prism component and the rotor relative to the stator, the dual-channel optical signal rotation and light transmission are achieved without interfering with each other; through the non-contact collimation coupling of four optical fiber collimators concentrically arranged at the rotation center, the optical path can rotate 360° without restriction and the transmission signal is more stable.

[0012] Preferably, the prism component is a dove prism, which has the beneficial effect that the dove prism can realize an object-image rotation ratio of 1:2.

[0013] Preferably, the counterbore includes a first counterbore, a second counterbore is provided at the bottom of the first counterbore, a boss is provided at the end of the stator, the gear system includes a prism gear sleeved on the boss, a planetary gear provided on the stator and an internal tooth provided on the second counterbore, the external teeth of the planetary gear are respectively meshed with the internal teeth and the external teeth of the prism gear, and the prism component is installed in the through hole of the prism gear. The beneficial effect is that the present invention uses a transmission structure of three gears to ensure that the Dove prism and the rotor have a certain transmission ratio when rotating relative to the stator, so that the continuous propagation of the dual-channel optical signal during the rotation process can be maintained without interruption and crossover.

[0014] Preferably, one end of the stator away from the rotor is fixedly connected to the base, the base is provided with an extension end, and the stator is fixedly connected to the extension end. The beneficial effect is that the stator can be stopped by this structural setting.

[0015] Preferably, the base is also provided with a motor and a transmission mechanism, and the motor drives the rotor to rotate through the transmission mechanism. The beneficial effect is that the base integrates the drive and transmission mechanism, which makes the structure compact while meeting the system requirements.

[0016] Preferably, a countersunk hole is provided at one end of the base away from the stator, the motor is arranged in the countersunk hole, a small pulley is sleeved on the rotating shaft of the motor, a large pulley is sleeved on one end of the rotor away from the stator, and the small pulley and the large pulley are driven by a synchronous belt;

[0017] The base is also provided with a tensioning wheel for adjusting the tension of the synchronous belt to achieve a smooth transmission from the motor to the rotor. The beneficial effect is that by providing a large pulley, the external motor can directly drive the rotor housing to rotate at a high speed through the large belt.

[0018] A fiber optic catheter control device includes a multimode fiber optic slip ring assembly according to any one of the above technical solutions, and also includes a guide rail module, the guide rail module includes a linear guide rail and a drive mechanism, the base is slidably connected to the linear guide rail, and the base is parallel to the axial direction of the base along the sliding direction of the linear guide rail.

[0019] Preferably, the guide rail module includes a guide rail seat, the driving mechanism is arranged on the guide rail seat, the driving mechanism includes a rotating screw, the base is provided with a threaded hole, the rotating screw cooperates with the threaded hole, and drives the base to move back and forth along the linear guide rail;

[0020] The linear guide rail is a double guide rail structure. Its beneficial effects are: the double guide rail structure can realize the stable movement of the base on the guide rail without shaking; by installing a driving mechanism on the guide rail seat, a rotating screw rod is extended from the driving mechanism and precisely matched with the threaded hole on the base, so that the base can move quickly and accurately position in the axial direction of the guide rod.

[0021] Preferably, the guide rail seat includes a first guide rail seat facing the stator and a second guide rail seat facing the rotor, the first guide rail seat and the second guide rail seat are respectively arranged on both sides of the base, and the second guide rail seat is provided with a second positioning guide device for positioning and guiding the optical fibers connected to the two optical fiber collimators of the rotor;

[0022] And / or, the first guide rail seat is provided with a first positioning guide device for positioning and guiding the optical fiber connected to the two optical fiber collimators of the stator. The beneficial effect is that the optical fiber positioning guide device is provided at the optical fiber entrance and exit to prevent the optical fiber from swinging around during the movement of the base.

[0023] Preferably, the two fiber collimators of the rotor are connected to a dual fiber bundle, the dual fiber bundle includes an excitation fiber and a demodulation fiber, the demodulation fiber is connected to a fiber collimator provided with a filter on the optical path, the excitation fiber is connected to another fiber collimator, and the dual fiber bundle is connected to a fiber connector after passing through a through hole of the second positioning guide device;

[0024] And / or, the optical fibers connected to the two optical fiber collimators of the stator are connected to a dual optical fiber bundle, the dual optical fiber bundle includes an excitation optical fiber and a demodulation optical fiber, the demodulation optical fiber is connected to a optical fiber collimator with a filter on the optical path, the excitation optical fiber is connected to another optical fiber collimator, and the dual optical fiber bundle is connected to the optical fiber connector after passing through the through hole of the first positioning guide device.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows: the excitation light and the demodulation light are transmitted through the composite transmission of the dual-channel optical signal, so that the demodulation light and the excitation light functions can be implemented in the same machine, which is convenient for doctors to use and can save a machine at the same time, so that patients are spared the pain of two different examinations, which can generate great social and economic value; through the differential rotation of the prism component and the rotor relative to the stator, the dual-channel optical signal rotation and light transmission are achieved without interfering with each other; through the non-contact collimation coupling of four optical fiber collimators concentrically arranged at the rotation center, the optical path can rotate 360° without restriction and the transmission signal is more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0027] Figure 1 FIG. 4 is a schematic cross-sectional view parallel to the rotation axis of an optical fiber catheter control device in one embodiment of the present invention.

[0028] Figure 2 for Figure 1 A partial enlarged schematic diagram of area A in the middle.

[0029] Figure 3 It is a schematic cross-sectional view parallel to the rotating shaft of a rotor part including a gear system in one embodiment of the present invention.

[0030] Figure 4 It is a cross-sectional schematic diagram of a stator part including a collimator in one embodiment of the present invention.

[0031] Figure 5 It is a schematic diagram of the structure of the stator stopping part in one embodiment of the present invention.

[0032] Figure 6 for Figure 1 A partial enlarged schematic diagram of area B in the middle.

[0033] Figure 7 for Figure 1 A partial enlarged schematic diagram of the C area in the middle.

[0034] Figure 8 FIG. 4 is a three-dimensional schematic diagram of an optical fiber catheter control device according to an embodiment of the present invention.

[0035] Fig. 9 FIG. 4 is a bottom view of a fiber optic catheter control device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0036] 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.

[0037] like Figure 1 and Figure 2 As shown, a multimode optical fiber slip ring assembly is used to pass one channel of ultrasonic excitation light and one channel of ultrasonic demodulation light in an all-optical ultrasonic imaging system, and comprises:

[0038] A base 205, wherein the base 205 is provided with a through hole;

[0039] The rotor 207 is disposed in the through hole. The rotor 207 is provided with a countersink. The stator 209, the gear system, and the prism component 116 are installed in the countersink. The rotor 207 drives the prism component 116 to rotate through the gear system. The gear system enables the rotation speed of the prism component 116 and the rotor 207 to maintain a certain ratio value relative to the stator 209. The prism component 116 is a prism combination that can achieve a predetermined ratio of the object-image rotation ratio.

[0040] The rotor 207 and the stator 209 are both provided with two optical fiber collimators 119. The optical axes of the two optical fiber collimators 119 of the rotor 207 and the two optical fiber collimators 119 of the stator 209 are parallel to the rotation axis of the rotor 207 and are equidistant from the rotation axis. When the rotor 207 rotates to a specific angle, the two optical fiber collimators 119 of the rotor 207 and the two optical fiber collimators 119 of the stator 209 are coaxial. Along the rotation axis direction of the rotor 207, the prism component 116 is provided between the rotor 207 and the stator 209. The light beams incident on the two optical fiber collimators 119 of the stator 209 pass through the prism component 116 and reach the two optical fiber collimators 119 of the rotor 207.

[0041] A filter 114 is provided on one of the optical path entrances of the two optical fiber collimators 119 of the rotor 207, and a filter 114 is provided on one of the optical path exits of the two optical fiber collimators 119 of the stator 209. The filter 114 is used to pass the ultrasonic demodulation light and cut off the ultrasonic excitation light. The wavelength of the ultrasonic excitation light does not fall within the wavelength range of the ultrasonic demodulation light, so the above filtering function can be achieved by selecting a suitable filter.

[0042] Specifically, in some embodiments, the rotor 207 is installed in the through hole of the base 205 through two large bearings 206, and the inner and outer rings of the large bearings 206 are fixed to the shaft and hole with which they are matched and assembled by glue. The stator 209 is installed in the through hole of the rotor 207 through two small bearings 208, and the inner and outer rings of the small bearings 208 are fixed to the shaft and hole with which they are matched and assembled by glue. Two optical fiber collimators 119 are installed in the two through holes of the rotor 207 and the stator 209, as shown in FIG. Figure 2 As shown, when the rotor 207 rotates to a specific angle, the two optical fiber collimators 119 of the rotor 207 are coaxial with the two optical fiber collimators 119 of the stator 209. The four collimators are respectively glued with the excitation light fiber 111, the demodulation fiber 108, the demodulation output fiber 229, and the excitation light output fiber 228 to transmit the light beam, wherein two optical filters 114 fixed by glue are arranged on the optical paths of the two optical fiber collimators 119 corresponding to the demodulation fiber 108 and the demodulation output fiber 229.

[0043] The excitation light and the demodulation light are transmitted in a composite manner through a dual-channel optical signal, so that the demodulation light and the excitation light functions can be implemented in the same machine, which is convenient for doctors to use. At the same time, one machine can be saved, and patients can be spared the pain of two different examinations, which can generate great social and economic value. Through the differential rotation of the prism component 116 and the rotor 207 relative to the stator 209, the dual-channel optical signals can rotate and transmit light without interfering with each other. Through the non-contact collimation coupling of four optical fiber collimators concentrically arranged at the rotation center, the optical path can rotate 360° without restriction and the transmission signal is more stable.

[0044] In some embodiments, Figure 2 As shown, the prism component 116 is a dove prism. The dove prism is used to achieve an object-image rotation ratio of 1:2. Accordingly, by selecting a gear system, the rotation speed of the rotor is twice the rotation speed of the dove prism. In some other embodiments, prism components with object-image rotation ratios of other ratios may also be used.

[0045] In some embodiments, Figure 3 and Figure 4As shown, the countersunk hole includes a first countersunk hole, a second countersunk hole is provided at the bottom of the first countersunk hole, a boss is provided at the end of the stator 209, the gear system includes a prism gear 219 sleeved on the boss, a planetary gear 216 provided on the stator 209, and an internal tooth provided on the second countersunk hole, the external teeth of the planetary gear 216 are respectively meshed with the internal teeth and the external teeth of the prism gear 219, and the prism component 116 is installed in the through hole of the prism gear 219. Through the transmission structure of the three gears, the prism component 116 and the rotor 207 have a certain transmission ratio when rotating relative to the stator 209, so that the continuous propagation of the dual-channel optical signal during the rotation process can be maintained without interruption and crossover.

[0046] Specifically, if Figure 2 , Figure 3 and Figure 4 As shown, the planetary gear 216 is installed in the blind hole of the stator 209 by means of the planetary gear bearing 217 fixed by glue, and the outer teeth of the planetary gear 216 mesh with the inner teeth of the rotor 207. When the stator 209 revolves relative to the rotor 207, the planetary gear 216 rotates. The prism component 116 is installed in the through hole of the prism gear 219 and fixed by glue. The prism gear 219 is sleeved on the boss of the stator 209 through the dove prism gear bearing 220, and the inner and outer rings of the bearing are fixed to the shaft and the hole matched with the inner and outer rings of the bearing by glue, and the outer teeth of the prism gear 219 mesh with the outer teeth of the planetary gear 216. The transmission ratio is controlled by adjusting the tooth number ratio of the external teeth of the prism gear 219 and the internal teeth of the rotor 207, so that the rotation speeds of the prism component 116 and the rotor 207 relative to the stator 209 have a certain ratio, thereby ensuring that when the two incident light rays passing through the stator 209 rotate at a certain angular velocity relative to the two outgoing light rays passing through the rotor 207, the two light rays can also be propagated one-to-one and will not cross.

[0047] In some embodiments, Figure 5 As shown, one end of the stator 209 away from the rotor 207 is fixedly connected to the base 205, and the base 205 is provided with an extended end, and the stator 209 is fixedly connected to the extended end. This structural setting is used to prevent the stator 209 from rotating. The anti-rotation pin 226 passes through the extended end of the base 205 and the pin hole of the stator 209 at the same time and is fixed by glue to prevent the stator 209 from rotating.

[0048] In some embodiments, Figure 8 and Fig. 9 As shown, the base 205 is also provided with a motor 211 and a transmission mechanism, and the motor 211 drives the rotor 207 to rotate through the transmission mechanism. The drive and transmission mechanism are integrated on the base 205, which makes the structure compact while meeting the system requirements.

[0049] In some embodiments, Figure 8 and Fig. 9As shown, a countersunk hole is provided at one end of the base 205 away from the stator 209, a motor 211 is arranged in the countersunk hole, a small pulley 212 is sleeved on the rotating shaft of the motor 211, a large pulley 210 is sleeved at one end of the rotor 207 away from the stator 209, and the small pulley 212 and the large pulley 210 are driven by a synchronous belt 215;

[0050] A tensioning wheel is also provided on the base 205 for adjusting the tension of the synchronous belt 215 to achieve a smooth transmission from the motor 211 to the rotor 207. By providing the large pulley 210, the external motor 204 can directly drive the rotor 207 housing to rotate at high speed through the large belt.

[0051] Specifically, the motor 211 is installed in the countersunk hole of the base 205 by screws, and the small pulley 212 is sleeved on the rotating shaft of the motor 211 and fixed by glue or interference fit. The tensioning wheel seat 213 is installed on the base 205 by screws passing through its waist hole, and can be adjusted by sliding back and forth along the direction of the line connecting the two centers of the waist hole. The inner ring of the tensioning wheel bearing 214 is fixed on the shaft of the tensioning wheel seat 213 by glue or interference fit. The synchronous belt 215 is wound around the tooth surfaces of the small pulley 212 and the large pulley 210, and by adjusting the position of the tensioning wheel seat 213, the synchronous belt 215 is tightened with the outer ring of the tensioning wheel bearing 214 to achieve smooth transmission from the motor 211 to the rotor 207 and high-speed rotation of the rotor 207.

[0052] like Figure 8 and Fig. 9 As shown, an optical fiber catheter control device includes a multi-mode optical fiber slip ring assembly of any one of the above technical solutions, and also includes a guide rail module, the guide rail module includes a linear guide rail and a driving mechanism, the base 205 is slidably connected to the linear guide rail, and the base 205 is parallel to the axial direction of the base 205 along the sliding direction of the linear guide rail.

[0053] In some embodiments, the guide rail module includes a guide rail seat 201, a driving mechanism is disposed on the guide rail seat 201, the driving mechanism includes a rotating screw, a base 205 is provided with a threaded hole, the rotating screw and the threaded hole cooperate to drive the base 205 to move back and forth along the linear guide rail;

[0054] The linear guide is a double guide structure. The double guide structure can realize the stable movement of the base 205 on the guide without shaking; by installing a driving mechanism on the guide seat 292, a rotating screw is extended from the driving mechanism and precisely matched with the threaded hole on the base 205, so that the base 205 can move quickly and accurately position in the axial direction of the guide rod.

[0055] Specifically, if Figure 8 and Fig. 9As shown, the guide rod 202 is positioned through the mounting hole of the guide rail seat 201 and fixed with glue, and the two guide rods 202 pass through the two through holes of the base 205 respectively, so that the base 205 can slide along the guide rod 202. The driving mechanism 204 is a linear motor, which is mounted on the linear motor support 203 by screws, and the linear motor support 203 is also mounted on the guide rail seat 201 by screws. The rotating screw 2041 of the linear motor 204 passes through the threaded through hole of the base 205, and drives the slider base 205 to slide smoothly along the guide rod 202 by rotating the screw 2041.

[0056] In some embodiments, Figure 6 and Figure 7 As shown, the guide rail seat 292 includes a first guide rail seat facing the stator 209 and a second guide rail seat facing the rotor 207, the first guide rail seat and the second guide rail seat are respectively arranged on both sides of the base 205, and the second guide rail seat is provided with a second positioning guide device 222 for positioning and guiding the optical fibers connected to the two optical fiber collimators 119 of the rotor 207;

[0057] And / or, the first guide rail seat is provided with a first positioning guide device 225 for positioning and guiding the optical fiber connected to the two optical fiber collimators 119 of the stator 209. The optical fiber positioning guide device is provided at the optical fiber entrance and exit to prevent the optical fiber from swinging around during the movement of the base 205.

[0058] In some embodiments, two fiber collimators 119 of the rotor 207 are connected to a dual fiber bundle, the dual fiber bundle includes an excitation fiber and a demodulation fiber, the demodulation fiber is connected to a fiber collimator 119 with a filter 114 on the optical path, the excitation fiber is connected to another fiber collimator 119, and the dual fiber bundle is connected to a fiber connector after passing through a through hole of the second positioning guide device 222;

[0059] And / or, the optical fibers connected to the two optical fiber collimators 119 of the stator 209 are connected to a dual optical fiber bundle, which includes an excitation optical fiber and a demodulation optical fiber. The demodulation optical fiber is connected to the optical fiber collimator 119 with a filter 114 on the optical path, and the excitation optical fiber is connected to another optical fiber collimator 119. The dual optical fiber bundle passes through the through hole of the first positioning guide device 225 and is connected to the optical fiber connector.

[0060] Specifically, if Figure 1 , Figure 6 and Figure 7As shown, the first positioning guide device 225 and the second positioning guide device 222 are installed on the guide rail seat 201 by screws. The excitation light optical fiber 111 and the demodulation optical fiber 108 are combined into a double optical fiber bundle 230 and fixed in the through hole of the first positioning guide device 225, and the other side of the double optical fiber bundle 230 is fused with an MPO connector 231; the demodulation output optical fiber 229 and the excitation light output optical fiber 228 are also combined into a double optical fiber bundle 230 that passes through the through hole of the second positioning guide device 222, and can rotate freely and move forward and backward along the axial direction of the through hole, and the other side of the double optical fiber bundle 230 is fused with an MPO connector 231.

[0061] In actual use, the MPO connector 231 at the end of the second positioning guide device 222 is connected to the optical fiber catheter assembly, and the optical fiber catheter assembly includes a probe, a catheter transmission assembly part and a catheter plug-in assembly. After the catheter plug-in assembly is connected to the MPO connector 231, the motor 211 drives the driver to rotate, and the drive mechanism 204 drives the slider base 205 to slide smoothly along the guide rod 202 through the rotating screw 2041, thereby driving the probe to move back and forth.

[0062] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A multimode optical fiber slip ring assembly, characterized in that: Used for passing one channel of ultrasound excitation light and one channel of ultrasound demodulation light in an all-optical ultrasound imaging system, comprising: A base, wherein the base is provided with a through hole; A rotor, the rotor is arranged in the through hole, the rotor is provided with a countersink, a stator, a gear system, and a prism component are installed in the countersink, the rotor drives the prism component to rotate through the gear system, and the gear system makes the rotation speed of the prism component and the rotor relative to the stator maintain a certain ratio value; the prism component is a prism combination that can achieve an object-image rotation ratio of a predetermined ratio; The rotor and the stator are each provided with two optical fiber collimators, and the optical axes of the two optical fiber collimators of the rotor and the two optical fiber collimators of the stator are parallel to the rotation axis of the rotor and are equidistant from the rotation axis. When the rotor rotates to a specific angle, the two optical fiber collimators of the rotor and the two optical fiber collimators of the stator are coaxial. Along the rotation axis direction of the rotor, the prism component is provided between the rotor and the stator, and the light beams incident on the two optical fiber collimators of the stator reach the two optical fiber collimators of the rotor after passing through the prism component. A filter is provided on the light path entrance of one of the two optical fiber collimators of the rotor, and a filter is provided on the light path entrance of one of the two optical fiber collimators of the stator. The filter is used to pass the ultrasonic demodulation light and cut off the ultrasonic excitation light.

2. The multimode optical fiber slip ring assembly according to claim 1, characterized in that: The prism component is a Dove prism.

3. The multimode optical fiber slip ring assembly according to claim 1, characterized in that: The countersunk hole includes a first countersunk hole, a second countersunk hole is provided at the bottom of the first countersunk hole, a boss is provided at the end of the stator, the gear system includes a prism gear sleeved on the boss, a planetary gear arranged on the stator and internal teeth arranged in the second countersunk hole, the external teeth of the planetary gear are respectively meshed with the internal teeth and the external teeth of the prism gear, and the prism component is installed in the through hole of the prism gear.

4. The multimode optical fiber slip ring assembly according to claim 1, characterized in that: One end of the stator away from the rotor is fixedly connected to the base, the base is provided with a protruding end, and the stator is fixedly connected to the protruding end.

5. The multimode optical fiber slip ring assembly according to any one of claims 1 to 4, characterized in that: A motor and a transmission mechanism are also provided on the base, and the motor drives the rotor to rotate through the transmission mechanism.

6. The multimode optical fiber slip ring assembly according to claim 5, characterized in that: The base is provided with a countersunk hole at one end away from the stator, the motor is arranged in the countersunk hole, a small pulley is sleeved on the rotating shaft of the motor, a large pulley is sleeved on one end of the rotor away from the stator, and the small pulley and the large pulley are driven by a synchronous belt; The base is also provided with a tensioning wheel for adjusting the tension of the synchronous belt to achieve smooth transmission from the motor to the rotor.

7. An optical fiber catheter control device, characterized in that: The multimode optical fiber slip ring assembly comprises the multimode optical fiber slip ring assembly as described in any one of claims 1 to 6, and further comprises a guide rail module, wherein the guide rail module comprises a linear guide rail and a driving mechanism, wherein the base is slidably connected to the linear guide rail, and the sliding direction of the base along the linear guide rail is parallel to the axial direction of the base.

8. The optical fiber catheter control device according to claim 7, characterized in that: The guide rail module comprises a guide rail seat, the driving mechanism is arranged on the guide rail seat, the driving mechanism comprises a rotating screw, the base is provided with a threaded hole, the rotating screw cooperates with the threaded hole, and drives the base to move back and forth along the linear guide rail; The linear guide rail is a double guide rail structure.

9. The optical fiber catheter control device according to claim 8, characterized in that: The guide rail seat includes a first guide rail seat facing the stator and a second guide rail seat facing the rotor, the first guide rail seat and the second guide rail seat are respectively arranged on both sides of the base, and the second guide rail seat is provided with a second positioning guide device for positioning and guiding the optical fiber connected to the two optical fiber collimators of the rotor; And / or, the first guide rail seat is provided with a first positioning and guiding device for positioning and guiding the optical fibers connected to the two optical fiber collimators of the stator.

10. The optical fiber catheter control device according to claim 9, characterized in that: The two fiber collimators of the rotor are connected to a dual fiber bundle, the dual fiber bundle includes an excitation fiber and a demodulation fiber, the demodulation fiber is connected to a fiber collimator with a filter on the optical path, the excitation fiber is connected to another fiber collimator, and the dual fiber bundle is connected to a fiber connector after passing through the through hole of the second positioning guide device; And / or, the optical fibers connected to the two optical fiber collimators of the stator are connected to a dual optical fiber bundle, the dual optical fiber bundle includes an excitation optical fiber and a demodulation optical fiber, the demodulation optical fiber is connected to a optical fiber collimator with a filter on the optical path, the excitation optical fiber is connected to another optical fiber collimator, and the dual optical fiber bundle is connected to the optical fiber connector after passing through the through hole of the first positioning guide device.

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