Steel wire drive mechanism of an endoscope and ultrasonic endoscope

Abstract

The utility model discloses a steel wire drive mechanism of endoscope and ultrasonic endoscope, steel wire drive mechanism includes: rotating component, connects on operating part and includes a rotatable setting rotating seat, sliding slot cam, fixedly connected in rotating seat's outer periphery, is equipped with arc sliding slot on it, sliding pin, sliding connection is in arc sliding slot, sliding component, sliding connection is in operating part's linear sliding slot, one end of sliding component is connected with sliding pin, and the other end is connected with focusing steel wire, and the distal end of focusing steel wire is connected with focusing lens group of zoom lens module. When rotating component is operated and rotates, the sliding slot cam of synchronous rotation of rotating component can drive sliding pin and slide along arc sliding slot, and sliding pin drives sliding component and focusing steel wire and moves, and then realizes the adjustment of zoom lens module focal length, because the space that sliding slot cam rotates in the operating part is very small, is favorable to the miniaturization design of steel wire drive mechanism, also is convenient for increasing other components on operating part.

Description

Technical Field

[0001] This utility model relates to the field of endoscope technology, specifically to a wire drive mechanism for an endoscope and an ultrasonic endoscope. Background Technology

[0002] An endoscope mainly consists of an insertion section and an operating section. The insertion section is inserted into the human body, and the internal organs are observed through a lens assembly at the distal end of the insertion section. The operating section can adjust the distance between the lenses in the lens assembly to achieve focusing. Current endoscopes generally achieve focusing via a steel wire. One end of the steel wire is connected to a focusing lens group that can move back and forth within the lens assembly, and the other end is connected to a wire drive mechanism in the operating section. The wire drive mechanism can drive the steel wire in a linear motion, thereby controlling the position of the focusing lens group to achieve focusing.

[0003] In the prior art, the wire drive mechanism includes a rotating component and a multi-link mechanism. The rotating component can rotate around its own axis, and the multi-link mechanism connects the rotating component and the wire, converting the rotational motion of the rotating component into horizontal movement. This type of wire drive mechanism requires a large space in the operating section to allow the movement of the multi-link mechanism, which is not conducive to the miniaturization design of the wire drive mechanism and the operating section, nor is it conducive to adding other pipelines to the operating section. Utility Model Content

[0004] In view of this, the purpose of the present invention is to provide a wire drive mechanism for an endoscope to solve the problem that the existing wire drive mechanism occupies a large space and is not conducive to miniaturization design.

[0005] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows:

[0006] A wire drive mechanism for an endoscope, the wire drive mechanism being disposed on the operating part of the endoscope, the operating part being provided with a straight sliding groove; the wire drive mechanism comprising:

[0007] A rotating assembly is connected to the operating part and includes a rotating seat that is rotatable about its own axis.

[0008] A sliding cam is fixedly connected to the outer periphery of the rotating seat, and the sliding cam is provided with an arc-shaped sliding groove located on the outer periphery of the rotating seat;

[0009] A sliding pin is slidably connected to the arc-shaped groove along the extending direction of the arc-shaped groove;

[0010] A sliding component is slidably connected to a linear slide groove of the operating part; one end of the sliding component is connected to the sliding pin and the other end is connected to a focusing steel wire, the distal end of which is connected to the focusing lens group of the zoom lens module.

[0011] When the rotating seat is operated to rotate, it drives the sliding cam to rotate synchronously. The sliding cam drives the sliding pin to slide along the arc-shaped sliding groove. The sliding pin drives the sliding assembly to slide along the straight sliding groove to drive the focusing wire to move.

[0012] By adopting the above technical solution, when the rotating seat is rotated, the sliding cam that rotates synchronously with the rotating seat can drive the sliding pin to slide along the arc-shaped sliding groove. The sliding pin drives the sliding component and the focusing wire to move, thereby realizing the adjustment of the focal length of the zoom lens module. Since this wire drive mechanism occupies very little space on the operating part during the rotation of the sliding cam, it is conducive to the miniaturization design of the wire drive mechanism, which makes it easier to provide more installation space for other components on the operating part and to add other components to the operating part.

[0013] Furthermore, the arc-shaped slide groove includes a first end and a second end, and the sliding pin can slide between the first end and the second end of the arc-shaped slide groove; in the direction from the first end to the second end, the distance between each position of the arc-shaped slide groove and the rotating fixed seat of the rotating assembly gradually increases.

[0014] By adopting the above technical solution, during the process of operating the rotating base to pull the focusing wire, the sliding pin slides along the arc-shaped slide groove from the second end to the first end under the action of the slide cam, which can realize the continuous adjustment of the focal length of the zoom lens module. Moreover, during the process of the sliding pin sliding along the arc-shaped slide groove from the second end to the first end, force analysis of the slide cam shows that when the magnitude of the applied force on the rotating component remains constant, the torque at the force-applying end of the slide cam remains constant. At the force-receiving end of the slide cam, since the lever arm gradually decreases, the pulling force of the slide cam on the sliding pin will increase accordingly. In scenarios where the resistance is greater as the movement of the focusing wire increases, a stable force can be applied to the rotating component to drive the focusing wire to move stably. This can increase the operating feel of the rotating component, improve the adjustment accuracy of the focal length of the manually adjusted zoom lens module, and reduce the difficulty of focusing operation.

[0015] Furthermore, the sliding pin includes a sliding segment and a connecting segment arranged sequentially along the axial direction, the connecting segment being fixedly connected to the sliding assembly, and the sliding segment being slidably engaged with the arc-shaped groove.

[0016] Furthermore, a recessed step is formed within the arc-shaped chute. The arc-shaped chute includes a first chute section located at the upper part and a second chute section located at the lower part with a width smaller than that of the first chute section. The first chute section and the second chute section are connected by a recessed step surface.

[0017] The sliding section includes a first sliding section and a second sliding section with an outer diameter smaller than that of the first sliding section; the first sliding section and the first sliding groove section are slidably engaged, and the second sliding section and the second sliding groove section are slidably engaged. The sliding section enables the sliding pin to slide along the extension direction of the arc-shaped sliding groove, and the recessed step surface provides vertical limiting support for the sliding pin.

[0018] By adopting the above technical solution, when the arc-shaped groove of the slide cam contacts the sliding pin and applies force to the sliding pin, the first groove section of the arc-shaped groove and the first sliding section of the sliding pin form a contact line, and the second groove section of the arc-shaped groove and the second sliding section of the sliding pin form another contact line. The two contact lines can improve the stability and smoothness when the slide cam drives the sliding pin to move.

[0019] Furthermore, at least one of the mating surfaces of the sliding cam and the sliding pin is made of a material with self-lubricating properties, or the mating surfaces of the sliding cam and the sliding pin are provided with a lubricating coating.

[0020] By adopting the above technical solution, the mating surfaces of the slide cam and the sliding pin have self-lubricating properties or are provided with a lubricating coating, which can further improve the smoothness of the slide cam driving the sliding pin.

[0021] Furthermore, the sliding component includes;

[0022] The slide rod has one end connected to the sliding pin;

[0023] The proximal slider is connected to the other end of the slide rod and slides in cooperation with the linear slide groove of the operating part;

[0024] The distal slider is fixedly connected to the slider and slides in cooperation with the linear slide groove of the operating part;

[0025] A steel wire fixing rod is fixedly connected to the distal slider; the proximal end of the focusing steel wire is fixedly connected to the steel wire fixing rod.

[0026] Furthermore, the proximal slider has an axially extending through hole inside, and the proximal end of the distal slider has a connecting shaft extending into the through hole. The proximal end of the connecting shaft has a threaded section, and a locking nut is threadedly connected to the threaded section. The proximal slider has a first end face and a second end face facing the locking nut. An elastic element that elastically presses against the locking nut and the first end face is sleeved on the outer periphery of the connecting shaft. The second end face is located near the first end face, and there is a gap between the side of the locking nut facing the second end face and the second end face.

[0027] By adopting the above technical solution, when the applied tension on the proximal slider is insufficient to compress the elastic element, the proximal slider, elastic element, locking nut, and distal slider are equivalent to a rigid connection, and the distal slider moves synchronously with the proximal slider; when the applied tension on the proximal slider is too large and can compress the elastic element, the gap between the locking nut and the second end face allows the elastic element to be compressed a certain distance before forming a rigid connection with the locking nut, avoiding the application of excessive tension to the focusing wire instantly, preventing the focusing lens group ultimately connected to the focusing wire from being damaged by tension, and forming an overload protection function.

[0028] Furthermore, the distal slider has an inner hole, one end of the wire fixing rod extends into the inner hole, and the outer periphery of the wire fixing rod has a fixing groove with a flat bottom surface. The distal slider is provided with a locking member, one end of which extends into the fixing groove and abuts against the bottom surface of the groove to achieve a fixed connection between the wire fixing rod and the distal slider. The locking member can abut against different positions in the fixing groove to adjust the fixed position of the wire fixing rod within the distal slider.

[0029] By adopting the above technical solution, since the locking part of the distal slider can abut against any position on the bottom surface of the groove of the fixing groove of the wire fixing rod and fix the wire fixing rod and the distal slider together, the insertion depth of the wire fixing rod in the distal slider can be adjusted to achieve the adjustment of the installation position of the wire fixing rod.

[0030] Furthermore, the distal slider includes a threaded fixing section located at the distal end. An adjusting nut is threadedly connected to the outer periphery of the threaded fixing section. The adjusting nut has an injection hole that communicates with its own internal threaded hole. The adjusting nut is glued to the threaded fixing section by the glue injected through the injection hole.

[0031] By adopting the above technical solution, before the threaded fixing section of the adjusting nut and the distal slider is fixed with glue, a tool inserted into the glue injection hole can be used to drive the adjusting nut to rotate, so as to adjust the front and rear position of the adjusting nut and limit the stroke. After confirming the position, glue is added to the glue injection hole on the adjusting nut to fix it and prevent the adjusting nut from loosening.

[0032] Furthermore, the operating part is fixed with a rotating base, and the rotating assembly includes:

[0033] A rotating fixing seat is fixedly connected to the rotating base;

[0034] A rotating seat is rotatably connected to the outer periphery of the rotating fixed seat about the axis of the rotating fixed seat, and the sliding cam is fixedly connected to the rotating seat;

[0035] An operating handle is fixedly connected to the rotating seat, and the operating handle is used to drive the rotating seat and the sliding cam to rotate relative to each other around the rotating fixed seat.

[0036] Furthermore, a wire sleeve is provided around the outer periphery of the focusing wire, and the proximal end of the wire sleeve is connected to the wire fixing rod. The operating part is provided with a limiting component for circumferentially limiting the wire fixing rod and the wire sleeve.

[0037] By adopting the above technical solution, the steel wire sleeve is fitted around the outer periphery of the focusing steel wire. The focusing steel wire moves inside the steel wire sleeve, which can protect the focusing steel wire and reduce the impact of bending, wear, etc. on the focusing steel wire. It can also limit the wobble of the focusing steel wire during its movement. The limiting component limits the steel wire fixing rod and the steel wire sleeve in the circumferential direction, which can limit the wobble of the steel wire fixing rod and the steel wire sleeve relative to their own axis. This ensures that the focusing steel wire can only move along its own axis and cannot wobble relative to its own axis, thus ensuring that the focusing steel wire can accurately adjust the focal length of the zoom lens module.

[0038] Furthermore, the limiting component includes:

[0039] A proximal fixing bracket is fixed to the operating part;

[0040] A limiting sleeve is fixed on the proximal fixing bracket, and its proximal end is coaxially sleeved on the outer periphery of the distal end of the steel wire fixing rod;

[0041] A distal fixing bracket is fixed to the operating part and located at the distal end of the proximal fixing bracket;

[0042] A steel pipe limiting sleeve is fixed on the near-end fixing bracket and coaxially sleeved and fixed on the outer periphery of the steel wire sleeve.

[0043] By adopting the above technical solution, the limiting sleeve can limit the steel wire fixing rod in the circumferential direction, and the steel pipe limiting sleeve can limit the steel wire sleeve in the circumferential direction. The two together can limit the sway of the steel wire fixing rod and the steel wire sleeve relative to their own axial direction.

[0044] Furthermore, a first sealing ring is provided to seal the gap between the limiting sleeve and the steel wire fixing rod, the proximal end of the steel pipe limiting sleeve extends into the inner hole of the limiting sleeve, and a second sealing ring is provided to seal the gap between the limiting sleeve and the steel pipe limiting sleeve.

[0045] An ultrasonic endoscope includes an operating section and an insertion section. The insertion section includes an insertion tube and an insertion head connected to the distal end of the insertion tube. The insertion head includes a headstock and an ultrasonic probe connected to the distal end of the headstock. The headstock is equipped with a zoom lens module. The focusing lens group of the zoom lens module is connected to a focusing wire. The proximal end of the focusing wire extends to the operating section. The operating section is equipped with a wire drive mechanism as described above for an endoscope. The wire drive mechanism is used to drive the focusing wire and the focusing lens group to move, thereby adjusting the focal length of the zoom lens module. This ultrasonic endoscope allows for adjustment of the focal length of the zoom lens module on the headstock by manipulating the wire drive mechanism on the operating section to move the focusing wire. Furthermore, since the wire drive mechanism occupies very little space on the operating section during rotation, it provides more installation space for other components on the operating section, facilitating the addition of other parts to the operating section.

[0046] The present invention has the following advantages: The rotating seat drives the sliding component and focusing wire through a sliding cam with an arc-shaped groove and a sliding pin sliding in the arc-shaped groove. Compared with the prior art where the rotating seat drives the sliding component and focusing wire through a multi-link mechanism, the rotating seat can still achieve focal length adjustment of the zoom lens module. Since the space occupied by the sliding cam during rotation is significantly smaller than that occupied by the multi-link mechanism during movement, the size of the wire drive mechanism can be reduced, which is beneficial for the miniaturization design of the wire drive mechanism and also makes it easier to add other components to the operating part to enrich its functions. Attached Figure Description

[0047] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0048] Figure 1 This is a schematic diagram of the installation structure of the wire drive mechanism on the operating part in an embodiment of this utility model;

[0049] Figure 2 This is a schematic diagram of the overall structure of the wire drive mechanism in an embodiment of this utility model;

[0050] Figure 3 This is an exploded view of the wire drive mechanism in an embodiment of this utility model;

[0051] Figure 4 This is a schematic diagram of the overall structure of the sliding cam in an embodiment of this utility model;

[0052] Figure 5 This is a schematic diagram of the overall structure of the sliding pin in an embodiment of this utility model;

[0053] Figure 6 This is a schematic diagram showing the positional relationship between the arc-shaped slide groove on the slide cam and the rotating fixed seat in an embodiment of this utility model;

[0054] Figure 7 This is a cross-sectional view of the wire drive mechanism in an embodiment of this utility model;

[0055] Figure 8 for Figure 7 Enlarged view of point A in the middle;

[0056] Figure 9 for Figure 7 Enlarged view of point B in the middle;

[0057] Figure 10 for Figure 7 A magnified view of a portion of the image.

[0058] Explanation of reference numerals in the attached drawings: 100, Operating part; 110, Operating part base plate; 120, Linear slide groove; 200, Rotating assembly; 210, Rotating base; 220, Rotating fixed seat; 230, Rotating seat; 240, Operating handle; 241, Lever; 242, Lever sleeve; 250, First screw; 260, Second screw; 270, Third screw; 280, Sealing ring; 300, Slide cam; 310, Arc-shaped slide groove; 310a, First end; 310b, Second end; 311, First slide section; 312, Second slide section; 320, Recessed step surface; 400, Sliding pin; 410, First sliding section; 411, Shoulder; 420, Second sliding section; 430, Connecting section; 500, Sliding assembly; 510 520. Sliding rod; 520a. Proximal slider; 520b. Second end face; 521. Through hole; 530. Distal slider; 531. Connecting shaft; 532. Threaded section; 533. Threaded fixing section; 534. Inner hole; 540. Steel wire fixing rod; 541. Fixing groove; 542. Welding flux port; 550. Locking nut; 560. Elastic element; 570. Locking element; 580. Adjusting nut; 581. Glue injection hole; 590. Fourth screw; 600. Focusing steel wire; 700. Steel wire sleeve; 800. Limiting assembly; 810. Proximal fixing bracket; 820. Limiting sleeve; 830. Distal fixing bracket; 840. Steel pipe limiting sleeve; 850. First sealing ring; 860. Second sealing ring. Detailed Implementation

[0059] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0060] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0061] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Throughout the text, the terms "proximal end" and "distal end" refer to the distance relative to the operator. The end closer to the doctor or operator is the "proximal end," i.e., the end where the operator is located, and the end farther from the doctor or operator is the "distal end," i.e., the end where the ultrasound probe is located.

[0062] In existing technologies, endoscopes mainly consist of an insertion section and an operating section. The insertion section is inserted into the human body, and the internal organs are observed through a lens module at the distal end of the insertion section. To ensure that the lens module obtains a clear image, some lens modules have a focusing function. Currently, focusing is generally achieved by adjusting the movement of the focusing lens group in the lens module using a steel wire. Correspondingly, the operating section needs to be equipped with a steel wire adjustment mechanism to drive the movement of the steel wire. However, the existing steel wire drive mechanism occupies a relatively large space in the operating section, affecting the layout of other components in the operating section and hindering the addition of more control components.

[0063] To solve the above problems, such as Figure 1As shown, this application provides a wire drive mechanism for an endoscope. The wire drive mechanism is disposed on the operating part 100 of the endoscope. The operating part 100 includes an operating part base plate 110 and a straight groove 120 disposed on the operating part base plate 110. The wire drive mechanism includes a rotating assembly 200, a groove cam 300, a sliding pin 400, and a sliding assembly 500.

[0064] like Figure 1 - Figure 3 As shown, the rotating assembly 200 includes a rotating base 210, a rotating fixed seat 220, a rotating seat 230, and an operating handle 240. The rotating base 210 is fixed to the operating unit base plate 110 by multiple screws. The rotating fixed seat 220 is fixed to the rotating base 210 by multiple first screws 250, and a sealing ring 280 is provided between the outer periphery of the rotating fixed seat 220 and the rotating base 210. The rotating seat 230 is rotatably connected to the outer periphery of the rotating fixed seat 220 about the axial direction of the rotating fixed seat 220. The operating handle 240 is used to drive the rotating seat 230 and the sliding cam 300 to rotate relative to the rotating fixed seat 220. The operating handle 240 includes a lever 241 and a lever sleeve 242. One end of the lever 241 is fixedly connected to the rotating seat 230 by multiple second screws 260. The lever sleeve 242 is sleeved on the end of the lever 241 that extends out of the operating part 100. By manually operating the end of the lever 241 with the lever sleeve 242, the rotating seat 230 is driven to rotate. The outer periphery of the lever sleeve 241 has a toothed structure. The operating handle 240 is used to drive the rotating seat 230 to rotate.

[0065] like Figure 1 - Figure 3 As shown, the sliding cam 300 is fixedly connected to the outer periphery of the rotating base 230, and the sliding cam 300 is provided with an arc-shaped sliding groove 310 located on the outer periphery of the rotating base 230. The sliding pin 400 is slidably connected to the arc-shaped sliding groove 310 along the extension direction of the arc-shaped sliding groove 310. The sliding assembly 500 is slidably connected to the straight sliding groove 120 of the operating part 100; one end of the sliding assembly 500 is connected to the sliding pin 400, and the other end is connected to the focusing wire 600. The distal end of the focusing wire 600 is connected to the focusing lens group of the zoom lens module. When the operating handle 240 is rotated, it drives the sliding cam 300 to rotate synchronously. The sliding cam 300 drives the sliding pin 400 to slide along the arc-shaped sliding groove 310, and the sliding pin 400 drives the sliding assembly 500 to slide along the straight sliding groove 120 to drive the focusing wire 600 to move.

[0066] In this wire drive mechanism, when the operating handle 240 is rotated, the sliding cam 300 rotates synchronously with the rotating seat 230. The sliding cam 300 drives the sliding pin 400 to slide along the arc-shaped sliding groove 310. The sliding pin 400 drives the sliding component 500 and the focusing wire 600 to move, thereby realizing the adjustment of the focal length of the zoom lens module. Because the sliding cam 300 occupies very little space on the operating part 100 during rotation, this wire drive mechanism is conducive to the miniaturization design of the wire drive mechanism, provides more installation space for other components on the operating part 100, and facilitates the addition of other components to the operating part 100.

[0067] like Figure 2 and Figure 4 As shown, the arc-shaped slide 310 includes a first end 310a and a second end 310b located at opposite ends, and the sliding pin 400 can slide between the first end 310a and the second end 310b of the arc-shaped slide 310. In the direction from the first end 310a to the second end 310b, the distance between each position of the arc-shaped slide 310 and the central axis of the rotating seat 230 gradually increases. Figure 9 In the diagram, point O is located on the central axis of the rotating base 230, point A is located at the first end 310a of the arc-shaped slide 310, and point B is located at the second end 310b of the arc-shaped slide 310. The length of line segment OA is less than the length of line segment OB. During the pulling of the focusing wire 600, the slide cam 300 rotates, and the sliding pin 400 slides along the arc-shaped slide 310 from point B to point A (that is, from the second end 310b to the first end 310a) under the force of the slide cam 300, thus realizing continuous adjustment of the focal length of the zoom lens module. Furthermore, during the process of the sliding pin 400 sliding from point B to point A along the arc-shaped slide groove 310, a force analysis of the slide cam 300 shows that when the magnitude of the applied force on the operating handle 240 remains constant, the torque at the force-applying end of the slide cam 300 remains constant. At the force-bearing end of the slide cam 300, the initial force arm is OB, and the final force arm is OA. Since OB > OA, the force arm gradually decreases. According to the lever principle, the pulling force of the slide cam 300 on the sliding pin 400 gradually increases. In scenarios where the greater the movement of the focusing wire 600, the greater the resistance, a stable force can be applied to the operating handle 240 to drive the focusing wire 600 to move stably. This improves the tactile feel of the operating handle 240, which is beneficial for improving the adjustment accuracy of the focal length of the manually adjusted zoom lens module and reducing the difficulty of focusing operations.

[0068] like Figure 2 - Figure 3 , Figure 5 , Figure 6 and Figure 9As shown, the sliding pin 400 includes a sliding section and a connecting section 430 arranged sequentially along the axial direction. The connecting section 430 is fixedly connected to the sliding assembly 500, and the sliding section is slidably engaged with the arc-shaped slide groove 310. A recessed step is formed within the arc-shaped slide groove 310. The arc-shaped slide groove 310 includes a first slide groove section 311 located at the upper part and a second slide groove section 312 located at the lower part with a width smaller than the first slide groove section 311. The first slide groove section 311 and the second slide groove section 312 are connected by a recessed step surface 320. The sliding section includes a first sliding section 410 and a second sliding section 420, both with cylindrical outer circumferences. The outer diameter of the second sliding section 420 is smaller than the outer diameter of the first sliding section 410. The first sliding section 410 and the first slide groove section 311 are slidably engaged, and the second sliding section 420 and the second slide groove section 312 are slidably engaged. The shoulder 411 of the first sliding section 410 is located on the recessed step surface 320. The two sliding sections allow the sliding pin 400 to slide better along the extension direction of the arc-shaped groove 310, and provide vertical limiting support for the sliding pin 400 through the cooperation of the recessed step surface 320 and the shoulder 411. When the arc-shaped groove 310 of the groove cam 300 contacts the sliding pin 400 and applies force to the sliding pin 400, the first groove section 311 and the first sliding section 410 form a contact line, and the second groove section 312 and the second sliding section 420 form another contact line. The two contact lines can improve the stability and smoothness of the sliding pin 400 when the groove cam 300 drives it to move.

[0069] In some embodiments, both the sliding cam 300 and the sliding pin 400 are made of high-strength materials; and at least one of the mating surfaces of the sliding cam 300 and the sliding pin 400 is made of a material with self-lubricating properties. Using a self-lubricating material on the mating surfaces of the sliding cam 300 and the sliding pin 400 further improves the smoothness of the movement of the sliding cam 300 driving the sliding pin 400. In other embodiments, a lubricating coating may be provided on the mating surfaces of the sliding cam 300 and the sliding pin 400 to improve lubrication between them.

[0070] like Figure 3 , Figure 7 and Figure 8As shown, in some embodiments, the sliding assembly 500 includes a slide rod 510, a proximal slider 520, a distal slider 530, and a wire fixing rod 540. One end of the slide rod 510 is fixedly connected to a sliding pin 400. The proximal slider 520 is fixedly connected to the other end of the slide rod 510 by multiple fourth screws 590. Both the proximal slider 520 and the distal slider 530 slide in contact with the linear groove 120 of the operating unit base plate 110. The proximal slider 520 has an axially penetrating through hole 521. The proximal end of the distal slider 530 has a connecting shaft 531 extending into the through hole 521. The proximal end of the connecting shaft 531 has a threaded section 532, which is threadedly connected to a locking nut 550. The proximal slider 520 has a first end face 520a and a second end face 520b facing the locking nut 550. The second end face 520b is closer to the locking nut 550 than the first end face 520a. An elastic element 560, specifically a spring, is provided around the outer periphery of the connecting shaft 531, elastically pressing against the locking nut 550 and the first end face 520a. Under normal conditions, there is a gap between the locking nut 550 facing the second end face 520b and the second end face 520b. In this sliding assembly 500, when the applied force to the proximal slider 520 is insufficient to compress the elastic element 560, the proximal slider 520, elastic element 560, locking nut 550, and distal slider 530 are essentially rigidly connected, with the distal slider 530 moving synchronously with the proximal slider 520. When the applied force to the proximal slider 520 is excessive and can compress the elastic element 560, the gap between the locking nut 550 and the second end face 520b allows the elastic element 560 to be compressed a certain distance before engaging with the locking nut 520. The locking nut 550 forms a rigid connection, and then the distal slider 530 moves synchronously with the proximal slider 520. Due to the gap between the locking nut 550 and the second end face 520b, when a large force is applied to the operating handle 240 instantaneously, the proximal slider 520 will not immediately drive the distal slider 530 and the focusing wire 600 to move. This avoids applying excessive tension to the focusing wire 600 instantaneously, preventing damage to the focusing lens group ultimately connected to the focusing wire 600 due to tension, thus forming overload protection. After the locking nut 550 contacts the second end face 520b, the proximal slider 520 can drive the distal slider 530 and the focusing wire 600 to move through the locking nut 550, without affecting the normal movement of the focusing wire 600.

[0071] like Figure 2 , Figure 3 , Figure 7 and Figure 8As shown, in some embodiments, the distal slider 530 has an inner hole 534, one end of the wire fixing rod 540 extends into the inner hole 534, and the portion of the wire fixing rod 540 extending into the inner hole 534 is fixedly connected to the distal slider 530 by two locking members 570. The proximal end of the focusing wire 600 is welded and fixed to the wire fixing rod 540. The outer periphery of the wire fixing rod 540 has a fixing groove 541, the bottom surface of the fixing groove 541 is flat, and the two locking members 570 are threadedly connected to the threaded holes of the distal slider 530 and extend into the fixing groove 541. One end of the locking member 570 extending into the fixing groove 541 can abut against the bottom surface of the fixing groove 541 to achieve a fixed connection between the wire fixing rod 540 and the distal slider 530. The length of the bottom surface of the fixing groove 541 is greater than the distance between the two locking members 570, and the depth of the inner hole 534 inside the distal slider 530 is sufficient. Therefore, the relative fixed positions of the wire fixing rod 540 and the distal slider 530 can be adjusted within a certain distance. Since the two locking members 570 can abut at different positions in the fixing groove 541 and fix the wire fixing rod 540 and the distal slider 530 together, the insertion depth of the wire fixing rod 540 within the distal slider 530 can be adjusted within a certain distance, thus achieving adjustment of the installation position of the wire fixing rod 540.

[0072] like Figure 2 , Figure 3 , Figure 7 and Figure 8 As shown, in some embodiments, the distal slider 530 includes a threaded fixing section 533 located at the distal end. An adjusting nut 580 is threadedly connected to the outer periphery of the threaded fixing section 533. The adjusting nut 580 has an injection hole 581 communicating with its internal threaded hole. Adhesive injected through the injection hole 581 is used to glue the adjusting nut 580 to the threaded fixing section 533. Before the adjusting nut 580 and the threaded fixing section 533 of the distal slider 530 are fixed with adhesive, a tool inserted into the injection hole 581 can be used to rotate the adjusting nut 580 to adjust its forward and backward position and limit its travel. After confirming the position, adhesive is added to the injection hole 581 of the adjusting nut 580 for fixation, preventing the adjusting nut 580 from loosening.

[0073] like Figure 2 , Figure 3 , Figure 7 and Figure 10As shown, in some embodiments, the proximal end of the focusing wire 600 extends into the recessed hole at the distal end of the wire fixing rod 540. The distal end of the wire fixing rod 540 is provided with a welding flux port 542, through which welding flux can enter the inner hole of the wire fixing rod 540 to weld and fix the proximal end of the focusing wire 600 to the wire fixing rod 540. A wire sleeve 700 is fitted around the outer periphery of the focusing wire 600, and the proximal end of the wire sleeve 700 also extends into the recessed hole at the distal end of the wire fixing rod 540 and is sealed to the wire fixing rod 540. The focusing wire 600 moves inside the wire sleeve 700, which protects the focusing wire 600, reduces the impact of bending, wear, etc., and limits the swaying of the focusing wire 600 during movement.

[0074] like Figure 2 , Figure 3 , Figure 7 and Figure 10 As shown, in some embodiments, the operating part 100 is provided with a limiting component 800. The limiting component 800 is used to limit the wire fixing rod 540 and the wire sleeve 700 in the circumferential direction. The limiting component 800 can limit the sway of the wire fixing rod 540 and the wire sleeve 700 relative to their own axis, so that the focusing wire 600 can only move along its own axis and cannot sway relative to its own axis, thus ensuring that the focusing wire 600 can accurately adjust the focal length of the zoom lens module.

[0075] like Figure 1 , Figure 2 , Figure 3 , Figure 7 and Figure 10As shown, the limiting assembly 800 includes a proximal fixing bracket 810, a limiting sleeve 820, a distal fixing bracket 830, and a steel pipe limiting sleeve 840. Both the proximal fixing bracket 810 and the distal fixing bracket 830 are fixed to the operating unit base plate 110, with the distal fixing bracket 830 located at the distal end of the proximal fixing bracket 810. The limiting sleeve 820 is engaged with the proximal fixing bracket 810, and its proximal end is coaxially sleeved around the outer periphery of the distal end of the steel wire fixing rod 540. A first sealing ring 850 seals the gap between the limiting sleeve 820 and the steel wire fixing rod 540. A pair of folded edges of the proximal fixing bracket 810 tightly grip the limiting sleeve 820, preventing the steel wire fixing rod 540 and the focusing steel wire 600 within the limiting sleeve 820 from moving forward and backward, and preventing them from arching upward. The steel pipe limiting sleeve 840 is engaged in the groove at the upper end of the proximal fixing bracket 810. The steel pipe limiting sleeve 840 is coaxially sleeved on the outer periphery of the steel wire sleeve 700, and the proximal end of the steel pipe limiting sleeve 840 extends into the inner hole of the limiting sleeve 820. A second sealing ring 860 is provided to seal the gap between the limiting sleeve 820 and the steel pipe limiting sleeve 840. The limiting sleeve 820 can limit the steel wire fixing rod 540 in the circumferential direction, and the steel pipe limiting sleeve 840 can limit the steel wire sleeve 700 in the circumferential direction. The cooperation of the two can limit the sway of the steel wire fixing rod 540 and the steel wire sleeve 700 relative to their own axial direction.

[0076] This utility model embodiment also provides an ultrasonic endoscope, including an operating part 100 and an insertion part. The insertion part includes an insertion tube and an insertion head connected to the distal end of the insertion tube. The insertion head includes a headstock and an ultrasonic probe connected to the distal end of the headstock. The headstock is provided with a zoom lens module. The focusing lens group of the zoom lens module is connected to a focusing wire 600. The proximal end of the focusing wire 600 extends to the operating part 100. The operating part 100 is provided with a wire drive mechanism for the endoscope as described above. The wire drive mechanism is used to drive the focusing wire 600 and the focusing lens group to move, thereby adjusting the focal length of the zoom lens module. This ultrasonic endoscope can adjust the focal length of the zoom lens module on the headstock by manipulating the wire drive mechanism on the operating part 100 to move the focusing wire 600.

[0077] In summary, the endoscope wire drive mechanism and ultrasonic endoscope provided by this utility model embodiment, by fixing a groove cam 300 with an arc-shaped groove 310 on the outer periphery of the rotating seat 230, when the rotating seat 230 drives the groove cam 300 to rotate synchronously, the sliding pin 400 can slide along the extension direction of the arc-shaped groove 310. Since the distance from each position of the arc-shaped groove 310 to the central axis of the rotating seat 230 is different, the sliding pin 400 will move closer to or further away from the central axis of the rotating seat 230 when sliding in the arc-shaped groove 310. The sliding component 500 can slide along the straight groove 110 under the drive of the sliding pin 400, thereby driving the focusing wire 600 to move back and forth to adjust the focal length of the zoom lens module. Compared with the existing technology where the rotating seat 230 drives the sliding component 500 and the focusing wire 600 through a multi-link mechanism, this wire drive method for the focusing wire 600 can achieve focal length adjustment of the zoom lens module. Since the space occupied by the sliding cam 300 during rotation on the operating part 100 is significantly less than that occupied by the multi-link mechanism during movement, the size of the wire drive mechanism can be reduced, which is beneficial for the miniaturization design of the wire drive mechanism and also makes it easier to add other components to the operating part 100 to enrich its functions.

[0078] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A wire drive mechanism for an endoscope, characterized in that, The wire drive mechanism is mounted on the operating part (100) of the endoscope, and the operating part (100) is provided with a straight groove (120); the wire drive mechanism includes: A rotating assembly (200) is connected to the operating part (100) and includes a rotating seat (230) rotatable about its own axis; A sliding cam (300) is fixedly connected to the outer periphery of the rotating seat (230), and the sliding cam (300) is provided with an arc-shaped sliding groove (310) located on the outer periphery of the rotating seat (230); A sliding pin (400) is slidably connected to the arc-shaped slide groove (310) along the extending direction of the arc-shaped slide groove (310); A sliding assembly (500) is slidably connected to a linear slide groove (120) of the operation part (100); one end of the sliding assembly (500) is connected to the sliding pin (400) and the other end is connected to a focusing wire (600), the far end of the focusing wire (600) is connected to the focusing lens group of the zoom lens module. When the rotating seat (230) rotates, it drives the sliding cam (300) to rotate synchronously. When the sliding pin (400) slides along the arc-shaped sliding groove (310), it drives the sliding assembly (500) to slide along the straight sliding groove (120) to drive the focusing wire (600) to move.

2. The endoscope wire drive mechanism according to claim 1, characterized in that, The arc-shaped slide (310) includes a first end (310a) and a second end (310b), and the sliding pin (400) can slide between the first end (310a) and the second end (310b) of the arc-shaped slide (310); in the direction from the first end (310a) to the second end (310b), the distance between each position of the arc-shaped slide (310) and the central axis of the rotating seat (230) gradually increases.

3. The endoscope wire drive mechanism according to claim 1, characterized in that, The sliding pin (400) includes a sliding section and a connecting section (430) arranged sequentially along the axial direction. The connecting section (430) is fixedly connected to the sliding assembly (500), and the sliding section is slidably engaged with the arc-shaped groove (310).

4. The endoscope wire drive mechanism according to claim 3, characterized in that, The arc-shaped chute (310) has a recessed step formed inside. The arc-shaped chute (310) includes a first chute section (311) located at the upper part and a second chute section (312) located at the lower part and with a width smaller than the first chute section (311). The first chute section (311) and the second chute section (312) are connected by a recessed step surface (320). The sliding section includes a first sliding section (410) and a second sliding section (420) with an outer diameter smaller than that of the first sliding section (410); the first sliding section (410) and the first sliding groove section (311) are slidably engaged, and the second sliding section (420) and the second sliding groove section (312) are slidably engaged. The sliding section allows the sliding pin (400) to slide along the extension direction of the arc-shaped sliding groove (310), and the recessed step surface (320) provides vertical limiting support for the sliding pin (400).

5. The endoscope wire drive mechanism according to claim 1, characterized in that, At least one of the mating surfaces of the sliding cam (300) and the sliding pin (400) is made of a material with self-lubricating properties, or the mating surfaces of the sliding cam (300) and the sliding pin (400) are provided with a lubricating coating.

6. The wire drive mechanism for an endoscope according to any one of claims 1-5, characterized in that, The sliding component (500) includes; The slide rod (510) is connected at one end to the sliding pin (400); The proximal slider (520) is connected to the other end of the slider (510) and slides in cooperation with the linear groove (120) of the operating part (100); The distal slider (530) is connected to the proximal slider (520) and slides in cooperation with the linear groove (120) of the operating part (100); A wire fixing rod (540) is fixedly connected to the distal slider (530); the proximal end of the focusing wire (600) is fixedly connected to the wire fixing rod (540).

7. The endoscope wire drive mechanism according to claim 6, characterized in that, The proximal slider (520) has an axially extending through hole (521) inside. The proximal end of the distal slider (530) has a connecting shaft (531) extending into the through hole (521). The proximal end of the connecting shaft (531) has a threaded section (532). The threaded section (532) is threadedly connected to a locking nut (550). The proximal slider (520) has a first end face (520a) and a second end face (520b) facing the locking nut (550). The outer periphery of the connecting shaft (531) is fitted with an elastic element (560) that elastically presses against the locking nut (550) and the first end face (520a). The second end face (520b) is located near the first end face (520a), and there is a gap between the side of the locking nut (550) facing the second end face (520b) and the second end face (520b).

8. The endoscope wire drive mechanism according to claim 6, characterized in that, The distal slider (530) has an inner hole (534) inside. One end of the wire fixing rod (540) extends into the inner hole (534). The outer periphery of the wire fixing rod (540) has a fixing groove (541). The distal slider (530) is provided with a locking member (570). One end of the locking member (570) extends into the fixing groove (541) and abuts against the bottom surface of the fixing groove (541). The locking member (570) can adjust the fixed position of the wire fixing rod (540) in the distal slider (530).

9. The wire drive mechanism for an endoscope according to claim 8, characterized in that, The distal slider (530) includes a threaded fixing section (533) located at the distal end. An adjusting nut (580) is threadedly connected to the outer circumference of the threaded fixing section (533). The adjusting nut (580) is provided with an injection hole (581) communicating with its own internal threaded hole. The adjusting nut (580) is glued to the threaded fixing section (533) by the glue injected through the injection hole (581).

10. The wire drive mechanism for an endoscope according to claim 6, characterized in that, The outer periphery of the focusing wire (600) is fitted with a wire sleeve (700), the proximal end of the wire sleeve (700) is connected to the wire fixing rod (540), and the operating part (100) is provided with a limiting component (800) for circumferentially limiting the wire fixing rod (540) and the wire sleeve (700).

11. The wire drive mechanism for an endoscope according to claim 10, characterized in that, The limiting component (800) includes: A proximal fixation bracket (810) is fixed to the operating part (100); The limiting sleeve (820) is fixed on the proximal fixing bracket (810), and its proximal end is coaxially sleeved on the outer periphery of the distal end of the wire fixing rod (540); The distal fixation bracket (830) is fixed to the operating part (100) and located at the distal end of the proximal fixation bracket (810); The steel pipe limiting sleeve (840) is fixed on the proximal fixing bracket (810) and coaxially sleeved and fixed on the outer periphery of the steel wire sleeve (700).

12. The wire drive mechanism for an endoscope according to claim 11, characterized in that, A first sealing ring (850) is provided to seal the gap between the limiting sleeve (820) and the steel wire fixing rod (540). The proximal end of the steel pipe limiting sleeve (840) extends into the inner hole (534) of the limiting sleeve (820). A second sealing ring (860) is provided to seal the gap between the limiting sleeve (820) and the steel pipe limiting sleeve (840).

13. The wire drive mechanism for an endoscope according to any one of claims 1-5, characterized in that, The rotating assembly (200) includes: A rotating base (210) is fixedly connected to the operating part (100); A rotating fixed base (220) is fixedly connected to the rotating base (210); A rotating seat (230) is rotatably connected to the outer periphery of the rotating fixed seat (220) about the axis of the rotating fixed seat (220), and the sliding cam (300) is fixedly connected to the rotating seat (230); An operating handle (240) is fixedly connected to the rotating seat (230). The operating handle (240) is used to drive the rotating seat (230) and the sliding cam (300) to rotate relative to each other around the rotating fixed seat (220).

14. An ultrasonic endoscope, characterized in that, The endoscope includes an operating part (100) and an insertion part. The insertion part includes an insertion tube and an insertion head connected to the distal end of the insertion tube. The insertion head includes a head end seat and an ultrasonic probe connected to the distal end of the head end seat. The head end seat is provided with a zoom lens module. The focusing lens group of the zoom lens module is connected to a focusing wire (600). The proximal end of the focusing wire (600) extends to the operating part (100). The operating part (100) is provided with a wire drive mechanism for the endoscope as described in any one of claims 1-13. The wire drive mechanism is used to drive the focusing wire (600) and the focusing lens group to move, so as to adjust the focal length of the zoom lens module.

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