Intracavity probe

Abstract

The utility model relates to the field of ultrasonic probes, in particular to an intracavity probe. An intracavity probe comprises: a sound head assembly, the sound head assembly comprises a sound head rotating shaft and an ultrasonic transducer, and the ultrasonic transducer is arranged on the sound head rotating shaft; the sound head rotating shaft is rotationally assembled on the mounting base body; the driving unit is connected with the sound head rotating shaft so as to drive the sound head assembly to rotate around the axis of the sound head rotating shaft; the limiting assembly comprises a transmission wheel set, the transmission wheel set comprises an input wheel and an output wheel, the input wheel is fixed on the sound head rotating shaft, and the output wheel is rotationally arranged on the mounting base body; a limiting structure is arranged between the installation base body and the output wheel and used for limiting the output wheel to rotate within the rotating angle range smaller than 360 degrees. The reduction ratio of the transmission wheel set is not smaller than 1, so that the input wheel has a rotation angle range not smaller than 360 degrees. The utility model mainly solves the technical problem that the probe is damaged due to the fact that the rotating angle of the sound head rotating shaft of the intracavity probe is possibly too large.

Description

Technical Field

[0001] The utility model relates to the field of ultrasonic probes, in particular to an intracavity probe. Background Art

[0002] An intracavitary probe is an ultrasound probe that can be inserted into the cavity of a human organ, for example, to perform ultrasound examinations on patients through the rectum, vagina, esophagus, etc.

[0003] In some related technologies, when the intracavity probe is working, the internal acoustic head shaft needs to drive the acoustic head to rotate. In order to ensure the normal operation of the intracavity probe, an encoder can be set on the intracavity probe to detect the rotation angle of the acoustic head shaft.

[0004] However, if some abnormal situations occur, such as encoder failure, encoder cable damage, accidental power failure of the probe, etc., the intracavity probe may not be able to accurately read the rotation angle of the acoustic head shaft. If the rotation of the acoustic head shaft is still controlled according to the normal state, the rotation angle of the acoustic head shaft may exceed the set value, causing damage to the internal components of the intracavity probe. Utility Model Content

[0005] The utility model mainly solves the technical problem that the rotation angle of the acoustic head shaft of the intracavity probe may be too large, which may cause damage to the probe.

[0006] The utility model provides an intracavity probe.

[0007] An intracavity probe, comprising:

[0008] An acoustic head assembly, the acoustic head assembly comprising an acoustic head shaft and an ultrasonic transducer, wherein the ultrasonic transducer is arranged on the acoustic head shaft;

[0009] A mounting base, on which the acoustic head shaft is rotatably mounted;

[0010] A driving unit, the driving unit being disposed on the mounting base and connected to the acoustic head shaft to drive the acoustic head assembly to rotate around the axis of the acoustic head shaft;

[0011] And a limiting component, the limiting component includes a transmission wheel group, the transmission wheel group includes an input wheel and an output wheel, the input wheel is fixed on the sound head shaft, and the output wheel is rotatably arranged on the mounting base; a limiting structure is provided between the mounting base and the output wheel, and the limiting structure is used to limit the rotation of the output wheel within a rotation angle range of less than 360 degrees; the reduction ratio of the transmission wheel group is not less than 1, so that the input wheel has a rotation angle range of not less than 360 degrees.

[0012] In one embodiment, the limiting structure includes a limiting protrusion provided on the output wheel and a blocking member provided on the mounting base, and the blocking member is located on the rotation path of the limiting protrusion.

[0013] In one embodiment, the output wheel includes an annular body, and the limiting protrusion is provided on a radial inner wall of the annular body.

[0014] In one embodiment, the output wheel includes a rotating connection portion, which is fixed to one axial side of the annular body, is coaxially arranged with the annular body, and is rotatably assembled on the mounting base.

[0015] In one embodiment, the mounting base has a base end surface parallel to the end surface of the output wheel, and the limiting structure includes an arc groove and a slide groove stopper. The arc groove is arranged on one of the output wheel and the mounting base, and the slide groove stopper is arranged on the other of the output wheel and the mounting base. The slide groove stopper extends into the arc groove, and limiting walls are provided at both ends of the arc groove in the arc length direction.

[0016] In one embodiment, the reduction ratio of the transmission wheel set is not less than 2, so that the input wheel has a rotatable range of not less than 720 degrees.

[0017] In one embodiment, the acoustic head shaft has a transmission section, which extends out from the side of the mounting base away from the ultrasonic transducer. A driven wheel is provided on the transmission section, and the driven wheel is connected to the driving wheel provided on the output shaft of the drive unit; the input wheel is provided between the driven wheel and the mounting base.

[0018] In one embodiment, the driven wheel and the driving wheel are synchronous pulleys.

[0019] In one embodiment, the transmission wheel set is a gear set.

[0020] In one embodiment, the gear set consists of an input gear and an output gear, and the gear transmission stage number of the gear set is one.

[0021] In one embodiment, the outer periphery of the output wheel is covered with gear teeth, or the outer periphery of the output wheel includes an arc-shaped segment provided with gear teeth.

[0022] In one embodiment, the acoustic head shaft can achieve a rotation angle range of not less than 720 degrees, the acoustic head shaft has a first rotation direction and a second rotation direction, the unidirectional rotation range of the acoustic head shaft in the first rotation direction is not less than 360 degrees, and the unidirectional rotation range of the acoustic head shaft in the second rotation direction is not less than 360 degrees.

[0023] In one embodiment, the maximum rotation angle range of the acoustic head axis is 1080 degrees.

[0024] Beneficial effects of the utility model:

[0025] The intracavity probe in the present invention is provided with a limit assembly, which includes an input wheel and an output wheel, and the reduction ratio is not less than 1, so that the rotation angle range of the input wheel of not less than 360 degrees can be converted into the rotation angle range of the output wheel of less than 360 degrees, so that a limit structure can be conveniently set between the mounting base and the output wheel to limit the rotation of the output wheel, thereby realizing the limitation of the rotation angle of the input wheel and the acoustic head shaft of not less than 360 degrees, adapting to the situation where the rotation angle of the acoustic head shaft is not less than 360 degrees, and meeting the rotation angle requirement of the acoustic head shaft, avoiding excessive rotation angle of the acoustic head shaft when abnormality occurs in the rotation angle detection of the acoustic head shaft, thereby avoiding damage to the intracavity probe. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a structural diagram of an embodiment of an intracavity probe in the present utility model;

[0027] Figure 2 yes Figure 1 Schematic diagram of a part of the structure;

[0028] Figure 3 yes Figure 2 Schematic diagram of the structure of the middle acoustic head shaft;

[0029] Figure 4 It is a structural diagram of the drive unit and the limit assembly;

[0030] Figure 5 yes Figure 4 main view.

[0031] List of feature names corresponding to the reference numerals in the figures:

[0032] 100, housing assembly; 110, handle housing; 120, probe housing; 121, acoustic window housing; 122, connection housing;

[0033] 200, shaft seat; 210, base end surface;

[0034] 300, acoustic head assembly; 310, acoustic head shaft; 311, mounting cavity; 312, transmission section; 320, ultrasonic transducer; 330, bearing;

[0035] 400, driving unit; 410, driving pulley; 420, driven pulley; 430, synchronous belt;

[0036] 510, transmission wheel set; 511, input gear; 512, output gear; 5121, rotating connection part; 520, limiting structure; 521, limiting protrusion; 522, blocking member. DETAILED DESCRIPTION

[0037] The present invention is further described in detail below through specific embodiments in conjunction with the accompanying drawings. Similar elements in different embodiments use associated similar element numbers. In the following embodiments, many detailed descriptions are intended to enable the present application to be better understood. However, those skilled in the art can easily recognize that some of the features can be omitted in different situations, or can be replaced by other elements, materials, and methods. In some cases, some operations related to the present application are not shown or described in the specification. This is to avoid the core part of the present application being overwhelmed by too much description. For those skilled in the art, it is not necessary to describe these related operations in detail. They can fully understand the related operations based on the description in the specification and the general technical knowledge in the art.

[0038] In addition, the features, operations, or characteristics described in the specification may be combined in any appropriate manner to form various embodiments. Furthermore, the steps or actions in the method description may be reordered or adjusted in a manner readily apparent to those skilled in the art. Therefore, the various sequences in the specification and drawings are provided solely for the purpose of clearly describing a particular embodiment and are not intended to be mandatory, unless otherwise specified.

[0039] The serial numbers assigned to components herein, such as "first," "second," etc., are used solely to distinguish the objects being described and do not convey any sequential or technical meaning. References to "connection" and "coupling" herein, unless otherwise specified, include both direct and indirect connections (couplings).

[0040] In an embodiment of an intracavitary probe of the present invention, the intracavitary probe includes a limiting assembly, which includes a transmission wheel group 510, and the transmission wheel group 510 includes an input gear 511 and an output gear 512. By setting the reduction ratio of the transmission wheel group 510 to not less than 1 and limiting the output gear 512 to rotate within an angular range of less than 360 degrees, the input gear 511 can have an angular range of not less than 360 degrees, thereby being able to limit the acoustic head shaft 310 with a rotation range exceeding 360 degrees, thereby avoiding the problem of being unable to adapt to a rotation range greater than 360 degrees of the acoustic head shaft 310 when a stopping structure is directly set on the acoustic head shaft 310 due to the size limitation of the stopping structure itself.

[0041] An embodiment of an intracavity probe in the present utility model:

[0042] The intracavity probe is used to collect ultrasound data by being inserted into a body cavity. During use, the ultrasound probe can be connected to an ultrasound host, which can receive and process the ultrasound data and generate ultrasound images. In one embodiment, the intracavity probe includes a housing assembly 100 and a core.

[0043] As an example, see Figure 1 and Figure 2 The housing assembly 100 includes a handle housing 110 and a probe housing 120 connected to the handle housing 110. The probe housing 120 includes an acoustic window housing 121 and a connecting housing 122. The end of the connecting housing 122 facing away from the acoustic window housing 121 is connected to the handle housing 110 or the rotating shaft seat 200. The acoustic window housing 121 and the connecting housing 122 both have an inner cavity. The end of the acoustic window housing 121 close to the connecting housing 122 can be fixedly connected to the connecting housing 122, and the other end is a closed end. The acoustic window housing 121 is arranged corresponding to the ultrasonic transducer 320 in the core body, and can be made of a material that is conducive to ultrasonic transmission to ensure the quality of scanning imaging. In some other embodiments, the acoustic window housing 121 and the connecting housing 122 can be made of the same material or different materials.

[0044] In one embodiment, the intracavitary probe includes a shaft base 200, which can be used for rotatable assembly of the acoustic head assembly 300 and for fixed connection of the handle housing 110 and the probe housing 120. The specific structural form of the shaft base 200 is not limited and can be a block structure or a shell structure. The handle housing 110 and the probe housing 120 can be fixed to the shaft base 200 in any manner. For example, they can be fixed to the shaft base 200 by means of snap-fitting, ultrasonic welding, bonding, fastener connection, etc., and at least a portion of the housing assembly 100 can be integrally formed with the shaft base 200.

[0045] The core is disposed inside the housing assembly 100 and may include an acoustic head assembly 300 , a driving unit 400 and a limiting assembly.

[0046] The acoustic head assembly 300 may include an acoustic head shaft 310 and an ultrasonic transducer 320. The ultrasonic transducer 320 is disposed on the acoustic head shaft 310. Figure 2 and Figure 3In a specific embodiment, the acoustic head shaft 310 can be a hollow shaft, and the interior can be used for wires to pass through. The number and purpose of the wires can be set as needed, for example, they can include signal lines for transmitting ultrasonic detection signals. Bearings 330 can be provided at the distal end and the proximal end of the acoustic head shaft 310 to ensure the flexible and stable rotation of the acoustic head shaft 310. The outer ring of the bearing 330 located at the distal end of the acoustic head shaft 310 can be fixed on the acoustic window shell 121, and the outer ring of the bearing 330 located at the proximal end of the acoustic head shaft 310 can be fixed on the shaft seat 200. The type and assembly structure of the bearing 330 can refer to the existing structures in the relevant technology. Considering that it has no direct relevance to the innovative content of this application and the technical problems to be solved, it will not be repeated here.

[0047] The terms "proximal" and "distal" appearing in this article are conventional terms in the medical field. For an instrument to be operated, the proximal end is the end closest to the operator, and the distal end is the end away from the operator, usually the end that first enters the patient's body. Figure 1 The displayed direction.

[0048] The distal end of the acoustic head shaft 310 is provided with a mounting cavity 311, and the ultrasonic transducer 320 can be embedded in the mounting cavity 311. The shape of the ultrasonic transducer 320 can be set according to the use requirements of the intracavity probe. Those skilled in the art will understand that the basic function of the ultrasonic transducer 320 is to realize the mutual conversion between electrical energy and acoustic energy. Specifically, it can convert electrical signals into ultrasonic waves and transmit them out, and it can also receive reflected ultrasonic waves and convert them back into electrical signals. The above processes respectively utilize the positive piezoelectric effect (electrical energy to acoustic energy) and the inverse piezoelectric effect (acoustic energy to electrical energy) of piezoelectric materials.

[0049] The acoustic head assembly 300 is primarily located axially within the probe housing 120, with its proximal end extending through a mounting hole in the shaft seat 200 and into the handle housing 110, forming a transmission section 312. The drive unit 400 and the position limiting assembly can be disposed within the handle housing 110, fully utilizing the larger interior space within the handle housing 110. In other embodiments, if the internal space meets the required requirements, the position limiting assembly can also be disposed within the handle housing 110, or within the mounting base.

[0050] The drive unit 400 can be a stepper motor or a servo motor. The drive unit 400 is connected to the acoustic head shaft 310 in a transmission manner to drive the acoustic head assembly 300 to rotate around the axis of the acoustic head shaft 310, thereby rotationally driving the ultrasonic transducer 320 to perform a radial scanning operation to obtain a corresponding ultrasonic image. In one embodiment, a driving pulley 410 is fixed to the output shaft of the drive unit 400, and a driven pulley 420 is fixed to the transmission section 312 of the acoustic head shaft 310. The driving pulley 410 and the driven pulley 420 are synchronous pulleys, and the two are connected by a synchronous belt 430. The synchronous belt drive can realize the rotation of the acoustic head shaft 310 and accurately realize the rotation angle control. It will be understood by those skilled in the art that the transmission structure between the acoustic head shaft 310 and the drive unit 400 can also be replaced with other forms, such as using a gear meshing transmission, and the number of gear stages can be arranged as needed.

[0051] In some embodiments, the acoustic head assembly 300 has a rotatable range exceeding 720 degrees and is capable of rotating within an angular range of not less than 720 degrees. It should be noted that the angular range of rotation of the acoustic head assembly 300 of not less than 720 degrees means that the acoustic head assembly 300 can rotate more than or equal to two revolutions in either the counterclockwise or clockwise direction about its central axis. Alternatively, it may mean that the total angular range of rotation of the acoustic head assembly 300 about its central axis in both the counterclockwise and clockwise directions is not less than 720 degrees. The specific range of rotation may vary depending on design requirements, such as rotation within a range of 0 to 720 degrees, rotation within a range of -360 to +360 degrees, or rotation within a range of 0 to 810 degrees, or even rotation within a range exceeding 810 degrees. 0 degrees may be the starting rotation angle of the acoustic head assembly 300, 720 degrees and 810 degrees may be the ending rotation angles of the acoustic head assembly 300 in one direction, and -360 degrees and +360 degrees may be the ending rotation angles of the acoustic head assembly 300 in a counterclockwise direction and a clockwise direction, respectively. The starting rotation angle of the acoustic head assembly 300 may also be -180 degrees, -360 degrees, etc.; accordingly, the ending rotation angle of the acoustic head assembly 300 is the difference between the travel angle of the acoustic head assembly 300 and the starting rotation angle of the acoustic head assembly 300.

[0052] In one embodiment, the acoustic head rotation axis 310 has a first rotation direction and a second rotation direction. The unidirectional rotation range of the acoustic head rotation axis 310 in the first rotation direction is not less than 360 degrees, and the unidirectional rotation range of the acoustic head rotation axis 310 in the second rotation direction is also not less than 360 degrees. It is understood that one of the first rotation direction and the second rotation direction can be the aforementioned clockwise direction, and the other can be the aforementioned counterclockwise direction.

[0053] Exemplarily, the rotation of the acoustic head shaft 310 within a stroke angle of not less than 720 degrees includes rotation from a first stroke angle to a second stroke angle, where the first stroke angle is the starting rotation angle or the reverse ending rotation angle of the acoustic head assembly 300, and the second stroke angle is the positive ending rotation angle of the acoustic head assembly 300, where the positive direction is one of the clockwise direction and the counterclockwise direction, and the reverse direction is the other of the clockwise direction and the counterclockwise direction.

[0054] For example, when the first travel angle is 0 degrees and the second travel angle is 720 degrees, the drive unit 400 can only drive the acoustic head shaft 310 to rotate between 0 and 720 degrees to protect the electrical connectors within the acoustic head shaft 310, thereby preventing the electrical connectors from affecting the transmission performance of the acoustic head assembly 300 when twisted or squeezed. Alternatively, when the first travel angle is 0 degrees and the second travel angle is greater than 720 degrees, the drive unit 400 drives the acoustic head shaft 310 to rotate within an angle range between 0 and greater than 720 degrees to achieve large-angle rotation of the acoustic head assembly 300, thereby meeting various angular requirements of the acoustic head assembly 300 and improving the scanning efficiency of the acoustic head assembly 300. This also protects the electrical connectors within the acoustic head shaft 310. Twisting or squeezing of the electrical connectors may affect the transmission performance of the acoustic head assembly 300, or even damage the electrical connectors. Alternatively, when the first stroke angle is -360 degrees and the second stroke angle is +360 degrees, the driving unit 400 drives the acoustic head shaft 310 to rotate within any angle range between -360 degrees and +360 degrees to achieve free forward and reverse angle selection of the acoustic head assembly 300, thereby meeting various angle requirements of the acoustic head assembly 300.

[0055] In one embodiment, the maximum rotational angle range of the acoustic head shaft 310 is 1080 degrees. The acoustic head shaft 310 can rotate one and a half turns in the first rotational direction, i.e., 540 degrees in the first rotational direction, and can rotate one and a half turns in the first rotational direction, i.e., 540 degrees in the second rotational direction. By limiting the maximum rotational angle range to 1080 degrees, damage to electrical connectors caused by excessive rotation of the acoustic head shaft 310 can be better avoided.

[0056] When the acoustic head assembly 300 rotates, an encoder can be provided within the intracavity probe to detect the position of the intracavity probe, thereby ensuring the effective operation of the acoustic head assembly 300. However, if the encoder malfunctions, the encoder cable is damaged, or the probe unexpectedly loses power during the rotation of the acoustic head assembly 300, the intracavity probe may not be able to accurately read the actual rotation angle of the acoustic head assembly 300. In this case, if the driving device continues to drive the acoustic head assembly 300 to rotate, the internal components of the intracavity probe may be damaged.

[0057] To effectively limit the rotation angle of the acoustic head assembly 300 when abnormal rotation occurs, the intracavity probe also includes a limit assembly. The limit assembly includes a transmission wheel assembly 510, which includes an input wheel and an output wheel. The input wheel is fixed to the acoustic head shaft 310 in any manner, such as integral connection, welding, interference fit, bonding, positioning by fasteners, etc. The output wheel is rotatably mounted on a mounting base. A limit structure 520 is provided between the mounting base and the output wheel. The limit structure 520 is used to limit the rotation of the output wheel to an angular range of less than 360 degrees. The reduction ratio of the transmission wheel assembly 510 is not less than 1, so that the input wheel has an angular range of not less than 360 degrees, and the transmission screw has an angular range of not less than 10 degrees. The mounting base can be formed by the shaft seat 200 alone. In some other embodiments, it can also be formed by the shaft seat 200 and the handle housing 110, by the shaft seat 200 and the probe housing 120, or by the shaft seat 200, the probe housing 120 and the handle housing 110.

[0058] By setting the above-mentioned limit assembly, when the actual rotation angle of the acoustic head assembly 300 exceeds the set angle range, the limit assembly can play a mechanical role in limiting the rotation of the acoustic head assembly 300, thereby preventing the acoustic head assembly 300 from excessively rotating and causing greater damage to related components in the intracavitary probe.

[0059] In one embodiment, the transmission wheel assembly 510 is a gear assembly. Using a gear assembly facilitates accurate transmission and effectively transfers force. In a specific embodiment, the gear assembly consists of an input gear 511 and an output gear 512, with a single gear stage. Using a single-stage gear transmission reduces the number of components and ensures better transmission accuracy. If the acoustic head shaft 310 has a rotational range of at least 720 degrees, since the input gear 511 is fixed to the acoustic head shaft 310, the rotational range of the input gear 511 is also at least 720 degrees. Furthermore, to ensure that the output gear 512 rotates within an angular range of less than 360 degrees, the reduction ratio of the transmission wheel assembly 510 is no less than 2. Of course, those skilled in the art will appreciate that in other embodiments, depending on the allowable angular range of the acoustic head shaft 310, for example, if the allowable angular range of the acoustic head shaft 310 is between 360 and 720 degrees, the reduction ratio of the transmission wheel assembly 510 may also be less than 2. In addition, the periphery of the output gear 512 may be fully covered with gear teeth, or the periphery of the output gear 512 may include an arc segment provided with gear teeth, as long as the input gear 511 can maintain a meshing relationship with the output gear 512 within a set rotation range.

[0060] In some other embodiments, the transmission wheel set 510 can also be replaced with other forms, such as a synchronous pulley form.

[0061] For the rotating output gear 512, the limiting structure 520 between the output gear 512 and the mounting base can adopt different structural forms. In some embodiments, the limiting structure 520 may include a limiting protrusion 521 provided on the output gear 512 and a blocking member 522 provided on the mounting base, and the blocking member 522 is located on the rotation path of the limiting protrusion 521. The limiting protrusion 521 and the blocking member 522 cooperate with each other, and the structure is simple and can be manufactured relatively easily. In a specific embodiment, please refer to Figure 4 and Figure 5 The output gear 512 includes an annular body, and a limiting protrusion 521 is provided on the radial inner wall of the annular body. The shape and size of the limiting protrusion are not limited, as long as it can form a positioning relationship with the blocking member 522 on the mounting base.

[0062] In some other embodiments, the limiting structure 520 can be replaced with other forms. For example, in some embodiments, the limiting protrusion 521 on the output gear 512 can be provided on the end surface of the output gear 512 away from the rotating shaft seat 200, and the blocking member 522 can be provided on the handle housing 110. Alternatively, an "L"-shaped blocking arm can be provided on the rotating shaft seat 200, with one end of the blocking arm fixedly connected to the rotating shaft seat 200 and the other end parallel to the end surface of the output gear 512 away from the rotating shaft seat 200 and located in the rotation path of the limiting protrusion 521, thereby limiting the rotation range of the output gear 512 through the limiting protrusion 521.

[0063] For example, in one embodiment, the shaft seat 200 may have a base end face 210 parallel to the end face of the output gear 512, and the limiting structure 520 may include an arc groove and a slide groove block. The arc groove is arranged on one of the output gear 512 and the base end face 210, and the slide groove block is arranged on the other of the output gear 512 and the mounting base. The slide groove block extends into the arc groove, and limiting walls are provided at both ends of the arc length direction of the arc groove. The limiting walls can limit the movable stroke of the slide groove block in the arc groove, thereby limiting the rotation angle of the output gear 512.

[0064] In a specific embodiment, the blocking member 522 can be a protruding column protruding from the base end surface 210, and the cross-section of the protruding column can be rectangular. The sidewalls of the limiting protrusion 521 along the circumference of the output shaft can be straight sidewalls, and the plane on which the straight sidewalls lie can pass through the axis of the output gear 512. The straight sidewalls can mate with the side surfaces of the protruding column, thereby effectively transmitting the supporting force and reliably limiting the position of the output gear 512 by the blocking member 522.

[0065] A stopper is provided on the inner side of the annular body of the output gear 512, and the inner side of the annular body also needs to leave rotational space for the blocking member 522. In this case, to achieve rotational assembly of the output gear 512, in one embodiment, the output gear 512 includes a rotational connection portion 5121, which is fixed to one side of the annular body in an axial direction, coaxially arranged with the annular body, and rotationally assembled to the mounting base. The rotational connection portion 5121 can be a connecting cylinder, which can be rotationally assembled to the rotating shaft seat 200 via a rolling bearing or a sliding bearing. For example, the rotating shaft seat 200 can be provided with an assembly hole, within which a bearing can be disposed. The bearing can be sleeved on the outer circumference of the connecting cylinder to achieve rotational assembly of the output gear 512. For another example, an annular groove or a recessed groove can be provided on the proximal end surface of the rotating shaft seat 200. The connecting cylinder is inserted into the annular groove or recessed groove, and the groove wall of the annular groove or recessed groove positions the connecting cylinder, forming a rotational pair. In some other embodiments, the rotating connection portion 5121 may also be a columnar structure, or a fan-ring structure, that is, formed by arc-shaped ring pieces, and the ring pieces may be distributed around the axis of the output gear 512 .

[0066] It should be noted that, in some other embodiments, the output gear 512 may also be assembled to other positions of the mounting base. For example, an assembly seat may be provided on the handle housing 110 , and the output gear 512 may be provided on the handle housing 110 .

[0067] During use, the drive unit 400 drives the acoustic head assembly 300 to rotate slightly greater than 720 degrees, for example, slightly greater than 360 degrees in both the forward and reverse directions. The input gear 511 in the limiter assembly rotates along with the acoustic head assembly 300, and the output gear 512 in the limiter assembly rotates within an angular range of less than 360 degrees, relying on the set reduction ratio of the transmission wheel assembly 510. If the acoustic head assembly 300 accidentally rotates beyond the set angular range, for example, by 1 degree (which can be increased or decreased as needed), the limiter structure 520 provided between the mounting base and the output gear 512 can restrict further rotation of the output gear 512, thereby limiting the rotation angle of the input gear 511 and the acoustic head assembly 300. This allows the rotation of the acoustic head assembly 300 to be limited even when the rotatable range of the acoustic head assembly 300 exceeds 720 degrees. Furthermore, the transmission wheel assembly 510 of the limiter assembly has a simple structure, making it easy to design and manufacture. Of course, in some other embodiments, the above-mentioned limiting assembly may also be applicable to the case where the rotatable range of the acoustic head assembly 300 is greater than or equal to 360 degrees and less than 720 degrees.

[0068] The above examples are used to illustrate the present invention, which are only used to help understand the present invention and are not intended to limit the present invention. Those skilled in the art of the present invention can make some simple deductions, modifications or substitutions based on the concept of the present invention.

Claims

1. An intracavity probe, characterized in that: include: An acoustic head assembly, the acoustic head assembly comprising an acoustic head shaft and an ultrasonic transducer, wherein the ultrasonic transducer is arranged on the acoustic head shaft; A mounting base, on which the acoustic head shaft is rotatably mounted; A driving unit, the driving unit being disposed on the mounting base and connected to the acoustic head shaft to drive the acoustic head assembly to rotate around the axis of the acoustic head shaft; And a limiting component, the limiting component includes a transmission wheel group, the transmission wheel group includes an input wheel and an output wheel, the input wheel is fixed on the sound head shaft, and the output wheel is rotatably arranged on the mounting base; a limiting structure is provided between the mounting base and the output wheel, and the limiting structure is used to limit the rotation of the output wheel within a rotation angle range of less than 360 degrees; the reduction ratio of the transmission wheel group is not less than 1, so that the input wheel has a rotation angle range of not less than 360 degrees.

2. The intracavity probe according to claim 1, wherein: The limiting structure includes a limiting protrusion arranged on the output wheel and a blocking member arranged on the mounting base, and the blocking member is located on the rotation path of the limiting protrusion.

3. The intracavity probe according to claim 2, wherein: The output wheel includes an annular body, and the limiting protrusion is arranged on the radial inner wall of the annular body.

4. The intracavity probe according to claim 3, wherein: The output wheel includes a rotation connection portion, which is fixed to one side of the annular body in the axial direction. The rotation connection portion is coaxially arranged with the annular body, and the rotation connection portion is rotatably assembled on the mounting base.

5. The intracavity probe according to claim 1, wherein: The mounting base has a base end surface parallel to the end surface of the output wheel, and the limiting structure includes an arc groove and a slide groove block. The arc groove is arranged on one of the output wheel and the mounting base, and the slide groove block is arranged on the other of the output wheel and the mounting base. The slide groove block extends into the arc groove, and limiting walls are provided at both ends of the arc groove in the arc length direction.

6. The intracavity probe according to any one of claims 1 to 5, characterized in that: The reduction ratio of the transmission wheel set is not less than 2, so that the input wheel has a rotatable range of not less than 720 degrees.

7. The intracavity probe according to any one of claims 1 to 5, characterized in that: The acoustic head shaft has a transmission section, which extends out from the side of the mounting base away from the ultrasonic transducer. A driven wheel is provided on the transmission section, and the driven wheel is connected to the driving wheel provided on the output shaft of the drive unit; the input wheel is provided between the driven wheel and the mounting base.

8. The intracavity probe according to claim 7, wherein: The driven wheel and the driving wheel are synchronous pulleys.

9. The intracavity probe according to any one of claims 1 to 5, characterized in that: The transmission wheel set is a gear set.

10. The intracavity probe according to claim 9, wherein: The gear set consists of an input gear and an output gear, and the gear transmission stage number of the gear set is one.

11. The intracavity probe according to claim 9, wherein: The outer periphery of the output wheel is covered with gear teeth, or the outer periphery of the output wheel includes an arc segment provided with gear teeth.

12. The intracavity probe according to any one of claims 1 to 5, characterized in that: The acoustic head shaft can achieve a rotation angle range of not less than 720 degrees. The acoustic head shaft has a first rotation direction and a second rotation direction. The unidirectional rotation range of the acoustic head shaft in the first rotation direction is not less than 360 degrees. The unidirectional rotation range of the acoustic head shaft in the second rotation direction is not less than 360 degrees.

13. The intracavity probe according to any one of claims 1 to 5, characterized in that: The maximum rotation angle range of the acoustic head rotation axis is 1080 degrees.

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