A magnetic drive ultrasonic biomicroscope scanning probe

Abstract

The application relates to the field of medical devices, in particular to a magnetic drive ultrasonic biological microscope scanning probe, which comprises a probe shell, a front end port is formed in one end of the probe shell, a transducer frame is mounted in the front end port of the probe shell, arc-shaped magnets and ultrasonic transducers are respectively embedded in two ends of the transducer frame, a first coil and a second coil are symmetrically arranged and fixedly installed in the front end port, the first coil and the second coil are connected in series, the first coil and the second coil have the same number of winding turns and the same winding direction, the arc-shaped magnets are located in an internal region surrounded by the first coil, a Hall device is also fixedly installed in the front end port, and a symmetric plane of the first coil and the second coil intersects with the Hall device. The application has the advantages of simple structure, excluded interference of the coil magnetic field on the Hall device, accurate position of the ultrasonic transducer can be determined, the swing of the ultrasonic transducer can be accurately controlled, and the ultrasonic biological microscope probe can realize precise sector scanning.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of medical devices, in particular to a magnetic drive ultrasonic biomicroscope scanning probe. BACKGROUND

[0002] Ultrasonic imaging technology has been widely used in clinical diagnosis, and imaging equipment is equipped with multiple types of probes for different purposes. The ultrasonic biomicroscope, as a special ultrasonic imaging equipment, usually adopts a mechanical scanning method. The mechanical fan-shaped scanning probe is one of them. Such equipment has high spatial resolution and is different from ordinary B-ultrasound. To reduce attenuation, the transducer is usually exposed to the outside and coupled to the examination site through an eye cup or water bag. The front end of such a probe has a small area, is suitable for the examination of narrow or small surface or small sound transmission window, and has low cost. It is particularly widely used in specialized ultrasonic imaging equipment.

[0003] There are many methods to achieve fan-shaped scanning. The traditional probe usually achieves fan-shaped swinging through a motor and a gear mechanism such as a bevel gear. The advantages of this method are that the motor technology is mature and the reliability is high. The disadvantages are that the efficiency is low, the device is heavy, the noise is large, and it is difficult to achieve closed-loop control due to the need for a transmission mechanism.

[0004] In recent years, magnetic drive probes have appeared, which use magnetic fields to drive. The ultrasonic transducer is fixed on a permanent magnet, and various forms of coils are used to generate a magnetic field to drive the permanent magnet to move, thereby achieving ultrasonic scanning. The magnetic drive probe usually uses a Hall device to detect the magnetic field formed by the permanent magnet connected to the ultrasonic transducer, thereby obtaining the position of the ultrasonic transducer.

[0005] Because the space where the Hall device is located also has a magnetic field generated by the coil for driving the permanent magnet to move, the Hall device actually detects the superposition of the permanent magnet magnetic field and the coil magnetic field. The coil magnetic field changes unpredictably and is difficult to eliminate, so it is difficult to obtain the accurate position of the ultrasonic transducer, and it is difficult to achieve precise control of the ultrasonic transducer. SUMMARY

[0006] The present application aims to at least solve one of the technical problems in the related art. To this end, the present application provides a magnetic drive ultrasonic biomicroscope scanning probe.

[0007] The application is implemented by the following technical scheme: a magnetic drive ultrasonic biological microscope scanning probe, comprising a probe shell, a first end port is formed at one end of the probe shell, a transducer frame is installed in the first end port of the probe shell, the transducer frame can rotate relative to the probe shell, an arc-shaped magnet and an ultrasonic transducer are embedded in the transducer frame, the arc-shaped magnet and the ultrasonic transducer are respectively located at two ends of the transducer frame, the arc-shaped magnet is located at one side of the ultrasonic transducer close to the inside of the probe shell, a first coil and a second coil are symmetrically arranged and fixedly installed in the first end port, the axis of the first coil is collinear with the axis of the second coil, the first coil and the second coil are connected in series, the number of turns of the first coil and the second coil is the same and the winding direction of the first coil and the second coil is the same, the arc-shaped magnet is located in the internal region enclosed by the first coil, a Hall device is also fixedly installed in the first end port, the center of the Hall piece of the Hall device is located on the symmetry plane of the first coil and the second coil, and the normal line of the Hall piece passing through the center of the Hall piece is perpendicular to the axis of the first coil and intersects with the axis of the first coil.

[0008] Preferably, a solenoid frame is fixedly connected in the probe shell, the transducer frame is rotationally connected to the middle part of the solenoid frame through a hinge shaft, and the first coil and the second coil are both wound on the outer periphery of the solenoid frame.

[0009] Preferably, an accommodation groove is formed in the end face of the solenoid frame away from the ultrasonic transducer, and the Hall device is embedded in the accommodation groove.

[0010] Preferably, the probe shell comprises a front shell and a rear shell which are connected by threads.

[0011] Preferably, the end face of the solenoid frame away from the ultrasonic transducer is the bottom face of the solenoid frame, a first step face is protruded on the outer periphery of the solenoid frame, the first step face is away from the bottom face of the solenoid frame, an inner boss is arranged on the inner periphery of the front shell, the first step face abuts against the inner boss when the rear shell is threadedly connected to the front shell, and the end face of the rear shell close to the ultrasonic transducer abuts against the bottom face of the solenoid frame.

[0012] Preferably, a first positioning hole is formed in the side wall of the front shell, a second positioning hole corresponding to the first positioning hole is formed in the side wall of the solenoid frame, and a same positioning pin is embedded in the first positioning hole and the second positioning hole.

[0013] Preferably, a connecting lug is protruded on the bottom face of the solenoid frame, and a circuit board is fixedly installed on the connecting lug.

[0014] Preferably, a tail port is formed at one end of the rear shell away from the first end port, a wire protection sleeve is embedded in the tail port, and a cable is arranged in the wire protection sleeve.

[0015] Preferably, a flexible waterproof cap is arranged between the ultrasonic transducer and the front shell.

[0016] Preferably, the probe shell periphery is provided with anti-skid lines.

[0017] The one or more technical solutions in the embodiments of the present application have at least one of the following technical effects:

[0018] The present application has simple structure, eliminates the interference of the coil magnetic field on the Hall device, can determine the accurate position of the ultrasonic transducer, and further can accurately control the swing of the ultrasonic transducer, so that the ultrasonic biological microscope probe realizes precise sector scanning; the setting of the solenoid frame makes the first coil and the second coil have high stability; the fixing of the solenoid frame can be realized simultaneously in the process of assembling the rear shell, so that the overall assembly efficiency can be improved; the positioning pin makes the solenoid frame have high assembly precision.

[0019] Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will become apparent to those skilled in the art upon examination of the following description and the attached drawings. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a structural schematic diagram of the present application.

[0021] Figure 2 is Figure 1 is a sectional view structure schematic diagram along A-A direction in the present application.

[0022] Figure 3 is Figure 2 is an enlarged structure schematic diagram at P in the present application.

[0023] Figure 4 is Figure 2 is a sectional view structure schematic diagram along B-B direction in the present application.

[0024] Figure 5 is Figure 4 is an enlarged structure schematic diagram at N in the present application.

[0025] Figure 6 is a solenoid frame structure schematic diagram provided by the present application.

[0026] In the figure: 1, ultrasonic transducer; 2, front shell; 3, rear shell; 4, wire protection sleeve; 5, cable; 6, flexible waterproof cap; 7, transducer frame; 8, solenoid frame; 9, first coil; 10, Hall device; 11, second coil; 12, connecting lug; 13, circuit board; 14, arc-shaped magnet; 15, positioning pin; 16, wire slot. DETAILED DESCRIPTION

[0027] In order to make the objects, technical solutions and advantages of the present application clearer, the following will be combined with the accompanying drawings for brief, complete description of the technical solutions in the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by a person of ordinary skill in the art without creative work belong to the protection scope of the present application. The following embodiments are used to illustrate the present application, but cannot be used to limit the scope of the present application.

[0028] In the description of the embodiments of the present application, it should be noted that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the embodiments of the present application and simplify the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application. In addition, the terms "first", "second", "third" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance.

[0029] In the description of the embodiments of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium. For a person of ordinary skill in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0030] In the embodiments of the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0031] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the present specification and the features of the different embodiments or examples without contradiction.

[0032] As shown in Figures 1-6 The present application provides a magnetic drive ultrasonic biological microscope scanning probe, comprising a probe shell, a first end port is formed at one end of the probe shell, a transducer frame 7 is installed in the first end port of the probe shell, the transducer frame 7 can rotate relative to the probe shell, the transducer frame 7 is embedded with an arc-shaped magnet 14 and an ultrasonic transducer 1, the arc-shaped magnet 14 and the ultrasonic transducer 1 are located at both ends of the transducer frame 7 respectively, the arc-shaped magnet 14 is located at the side of the ultrasonic transducer 1 close to the inside of the probe shell, the line connecting the arc-shaped magnet 14 and the ultrasonic transducer 1 is perpendicular to the rotation axis of the transducer frame 7 relative to the probe shell, a first coil 9 and a second coil 11 are symmetrically arranged and fixedly installed in the first end port, the axis of the first coil 9 is collinear with the axis of the second coil 11, the first coil 9 and the second coil 11 are connected in series, the number of turns of the first coil 9 and the second coil 11 is the same and the winding direction is the same, the arc-shaped magnet 14 is located in the internal region enclosed by the first coil 9, a Hall device 10 is also fixedly installed in the first end port, the Hall device 10 comprises a device shell and a Hall sheet fixedly connected to the device shell, the Hall device 10 further comprises a control current end lead and an output lead, the center of the Hall sheet of the Hall device 10 is located in the symmetry plane of the first coil 9 and the second coil 11, the normal line of the Hall sheet passing through the center of the Hall sheet is perpendicular to the axis of the first coil 9 and intersects with the axis of the first coil 9, at this time the Hall device is only sensitive to the radial magnetic field component of the first coil and the second coil.

[0033] When the first coil 9 and the second coil 11 are applied with alternating current, an alternating magnetic field will be generated in the region enclosed by the first coil 9, since the polarities of the arc-shaped magnet 14 at both ends are opposite, the alternating magnetic field generated by the first coil 9 acts on the arc-shaped magnet 14, causing the transducer frame 7 to reciprocate around its rotation axis, thereby enabling the fan-shaped scanning of the ultrasonic transducer 1.

[0034] At each moment when the first coil 9 and the second coil 11 are applied with alternating current, the second coil 11 generates a magnetic field with the same size and distribution as the first coil 9, so that the radial magnetic field component generated by the first coil 9 and the radial magnetic field component generated by the second coil 11 are offset at the symmetrical plane position of the first coil 9 and the second coil 11, thereby making the magnetic field detected by the Hall device 10 completely generated by the arc-shaped magnet 14, so that the induced voltage output by the output lead of the Hall device 10 only comes from the magnetic field distribution of the arc-shaped magnet 14, and the arc-shaped magnet 14 makes the swing angle of the transducer frame 7 and the induced voltage of the Hall device 10 have a fixed relationship, so that the position of the ultrasonic transducer 1 can be determined according to the induced voltage of the Hall device 10.

[0035] Specifically, in the embodiment, the normal line of the Hall sheet is parallel to the rotation axis of the transducer frame 7, and in this state, when the arc-shaped magnet 14 swings, the Hall device 10 can more sensitively sense the change of the magnetic field of the arc-shaped magnet 14 at the position of the Hall sheet, and the position of the ultrasonic transducer 1 can be more accurately determined.

[0036] In operation, the motion curve of the ultrasonic transducer 1 can be set, and the first coil 9 and the second coil 11 are provided with current as needed to drive the transducer frame 7 to swing, the position of the ultrasonic transducer 1 is detected in real time by the Hall device 10, and compared with the set motion curve, and a feedback signal is provided according to the comparison result, the direction of the current provided to the first coil 9 and the second coil 11 is adjusted, the ultrasonic transducer 1 is accelerated or decelerated, so that the motion curve of the ultrasonic transducer 1 is consistent with the set motion curve. The device has a simple structure, eliminates the interference of the coil magnetic field on the Hall device 10, can determine the accurate position of the ultrasonic transducer 1, and can accurately control the swing of the ultrasonic transducer 1, and precise sector scanning is realized.

[0037] The probe shell is fixedly connected with a solenoid frame 8, the solenoid frame 8 and the transducer frame 7 are both non-magnetic materials, the transducer frame 7 is rotationally connected to the middle part of the solenoid frame 8 through a hinge shaft, and the first coil 9 and the second coil 11 are both wound on the outer periphery of the solenoid frame 8. Specifically, the outer periphery of the solenoid frame 8 is provided with two parallel wire grooves 16, and the first coil 9 and the second coil 11 are respectively wound in the two wire grooves 16, so that the first coil 9 and the second coil 11 have high stability.

[0038] The end face of the solenoid frame 8 away from the ultrasonic transducer 1 is provided with a receiving groove, and the Hall device 10 is embedded in the receiving groove. In the assembly process, the solenoid frame 8, the transducer frame 7, the ultrasonic transducer 1, the arc-shaped magnet 14 and the Hall device 10 can be assembled as a complete assembly module, which is convenient for early assembly.

[0039] The probe shell comprises a front shell 2 and a rear shell 3 connected by threads, and in particular, the inner wall of the end of the front shell 2 away from the ultrasonic transducer 1 is provided with internal threads, and the rear shell 3 is provided with external threads matched with the internal threads, so as to facilitate the staff to assemble the front shell 2 and the rear shell 3 in advance and maintain them later.

[0040] The end face of the solenoid frame 8 away from the ultrasonic transducer 1 is the bottom face of the solenoid frame 8, the outer periphery of the solenoid frame 8 is provided with a first step face, the first step face is away from the bottom face of the solenoid frame 8, the inner periphery of the front shell 2 is provided with an inner boss, when the rear shell 3 is threadedly connected to the front shell 2, the first step face abuts against the inner boss, and the end face of the rear shell 3 close to the ultrasonic transducer 1 abuts against the bottom face of the solenoid frame 8, so that the solenoid frame 8 can be fixed during the assembly of the rear shell 3, and the overall assembly efficiency can be improved.

[0041] The side wall of the front shell 2 is provided with a first positioning hole, the side wall of the solenoid frame 8 is provided with a second positioning hole corresponding to the first positioning hole, and the first positioning hole and the second positioning hole are embedded with the same positioning pin 15, so that the solenoid frame 8 has high assembly precision.

[0042] The bottom face of the solenoid frame 8 is provided with a connecting lug 12, the connecting lug 12 is fixedly installed with a circuit board 13, the circuit board 13 is used for receiving the feedback signal of the Hall device 10 and providing alternating current to the first coil 9 and the second coil 11.

[0043] The end away from the front end of the rear shell 3 is provided with a tail end, the tail end is embedded with a wire sleeve 4, the wire sleeve 4 is provided with a cable 5, and the cable 5 is used for power supply to the circuit board 13.

[0044] The flexible waterproof cap 6 is arranged between the ultrasonic transducer 1 and the front shell 2, in particular, the flexible waterproof cap 6 is made of medical silicone rubber, the middle part of the flexible waterproof cap 6 is provided with a middle hole, the middle hole is bonded to the outer periphery of the end part of the transducer frame 7 close to the ultrasonic transducer 1, and the outer edge of the flexible waterproof cap 6 is tightly matched to the outer periphery of the end part of the solenoid frame 8 close to the ultrasonic transducer 1, so that the waterproof performance of the magnetic drive ultrasonic biological microscope scanning probe can be improved by arranging the flexible waterproof cap 6.

[0045] The outer periphery of the probe shell is provided with anti-skid lines, which can play an anti-skid role and facilitate the staff to hold it.

[0046] The working principle of the magnetic drive ultrasonic biological microscope scanning probe provided by the application is that alternating current is applied to the first coil 9 and the second coil 11, an alternating magnetic field is generated in the area surrounded by the first coil 9, the alternating magnetic field generated by the first coil 9 acts on the arc-shaped magnet 14 due to the opposite polarities of the two ends of the arc-shaped magnet 14, and the transducer frame 7 reciprocally swings around its rotation axis, so that the sector scanning of the ultrasonic transducer 1 can be realized; at each moment when the alternating current is applied to the first coil 9 and the second coil 11, the second coil 11 will generate a magnetic field with the same size and distribution form as the first coil 9, so that the radial magnetic field component generated by the first coil 9 and the radial magnetic field component generated by the second coil 11 will be offset at the position of the symmetry plane of the first coil 9 and the second coil 11, so that the magnetic field detected by the Hall device 10 is completely generated by the arc-shaped magnet 14, so that the induced voltage output by the output lead of the Hall device 10 only comes from the magnetic field distribution of the arc-shaped magnet 14, and the arc-shaped magnet 14 makes the swing angle of the transducer frame 7 and the induced voltage of the Hall device 10 have a fixed relationship, so that the position of the ultrasonic transducer 1 can be determined according to the induced voltage of the Hall device 10. The application has simple structure, eliminates the interference of the coil magnetic field on the Hall device, can determine the accurate position of the ultrasonic transducer, and then can accurately control the swing of the ultrasonic transducer, so that the ultrasonic biological microscope probe can realize precise sector scanning; the solenoid frame has high stability; the fixation of the solenoid frame can be realized at the same time in the process of assembling the rear shell, so that the overall assembly efficiency can be improved; the positioning pin makes the solenoid frame have high assembly precision.

[0047] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the application, and not to limit them; although the application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the application.

Claims

1. A magnetically driven ultrasonic biomicroscope scanning probe, comprising a probe housing, a first port being formed at one end of the probe housing, a transducer frame being mounted within the first port of the probe housing, the transducer frame being rotatable relative to the probe housing, the transducer frame being embedded with an arc-shaped magnet and an ultrasonic transducer, the arc-shaped magnet and ultrasonic transducer being located at two ends of the transducer frame, respectively, the arc-shaped magnet being located on a side of the ultrasonic transducer close to the interior of the probe housing, and characterized in that: A symmetrically arranged first coil and second coil are fixedly installed in the first port, the axis of the first coil is collinear with the axis of the second coil, the first coil and the second coil are connected in series, the first coil and the second coil have the same number of turns and the same winding direction, the arc magnet is located in the internal area surrounded by the first coil, and a Hall device is also fixedly installed in the first port, the center of the Hall plate of the Hall device is located in the symmetry plane of the first coil and the second coil, and the Hall plate normal passing through the center of the Hall plate is perpendicular to the axis of the first coil and intersects with the axis of the first coil.

2. The magnetically driven ultrasonic biomicroscope scanning probe according to claim 1, characterized in that: A solenoid frame is fixedly connected in the probe housing, the transducer frame is rotatably connected to the middle of the solenoid frame through a hinge shaft, and the first coil and the second coil are both wound around the outer circumference of the solenoid frame.

3. The magnetically driven ultrasonic biomicroscope scanning probe according to claim 2, characterized in that: An accommodating groove is provided on the end surface of the solenoid frame away from the ultrasonic transducer, and the Hall device is embedded in the accommodating groove.

4. The magnetically driven ultrasonic biomicroscope scanning probe according to claim 2, characterized in that: The probe housing includes a front housing and a rear housing that are threadedly connected.

5. The magnetically driven ultrasonic biomicroscope scanning probe according to claim 4, characterized in that: The end surface of the solenoid frame away from the ultrasonic transducer is the bottom surface of the solenoid frame. A first step surface is convexly provided on the outer periphery of the solenoid frame, and the first step surface is opposite to the bottom surface of the solenoid frame. An inner boss is provided on the inner periphery of the front shell. When the rear shell is threadedly connected to the front shell, the first step surface abuts against the inner boss, and the end surface of the rear shell close to the ultrasonic transducer abuts against the bottom surface of the solenoid frame.

6. The magnetically driven ultrasonic biomicroscope scanning probe according to claim 5, characterized in that: A first positioning hole is formed on the side wall of the front housing, and a second positioning hole corresponding to the first positioning hole is formed on the side wall of the solenoid frame. The first positioning hole and the second positioning hole are embedded with the same positioning pin.

7. The magnetically driven ultrasonic biomicroscope scanning probe according to claim 5, characterized in that: A connecting ear is protruded from the bottom surface of the solenoid frame, and a circuit board is fixedly mounted on the connecting ear.

8. The magnetically driven ultrasonic biomicroscope scanning probe according to claim 4, characterized in that: A tail port is formed at one end of the rear shell away from the head port. A wire protection sleeve is embedded in the tail port, and a cable is passed through the wire protection sleeve.

9. The magnetically driven ultrasonic biomicroscope scanning probe according to claim 4, characterized in that: A flexible waterproof cap is provided between the ultrasonic transducer and the front shell.

10. The magnetically driven ultrasonic biomicroscope scanning probe according to claim 1, characterized in that: The outer periphery of the probe housing is provided with anti-slip grooves.

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