Front end assembly, insertion part and endoscope

Abstract

The invention discloses a front end assembly, an insertion part and an endoscope, and belongs to the technical field of endoscopes. The front-end assembly comprises a front-end seat, a driven part and a piezoelectric plate; the front end seat is provided with an instrument channel; the driven part is of an annular structure and is provided with a connecting part, the connecting part is fixedly installed in the instrument channel, the far end of the driven part is a moving end, the moving end is provided with at least two moving parts distributed in the circumferential direction of the driven part, and at least parts of the moving parts are located in the instrument channel; the piezoelectric plate is installed between the moving part and the inner wall of the instrument channel, the piezoelectric plate is connected with a power line, and the piezoelectric plate can be electrified to deform to drive the moving part to deform, so that the inner diameter size of the moving end is changed. The piezoelectric plate is arranged to change the inner diameter of the movable end so as to change the water outlet diameter of the instrument channel, and the water outlet diameter is intermittently changed by controlling electrification of the piezoelectric plate, so that water flow is increased, pressure is reduced, pulses are formed, disturbance of liquid in the lower cup is increased, and calculus sediment is conveniently discharged.

Description

Technical Field

[0001] The present invention relates to the technical field of endoscopes, and in particular to a front end component, an insertion portion and an endoscope. Background Art

[0002] An endoscope is a commonly used medical device that can directly enter the natural channels of the human body and provide doctors with sufficient diagnostic information to treat diseases. The endoscope includes an insertion portion that can enter the human body through a human cavity or surgical incision.

[0003] When using an endoscope and a negative pressure suction sheath to treat stones in the renal pelvis, using the negative pressure suction sheath to establish a negative pressure suction channel can cooperate with the endoscope to establish a stable water circulation and promptly discharge the stones that have been broken by the laser. For small stones deposited on the inner wall of the renal calyx, the water flow sprayed by the endoscope is often used to impact the stones, so that the stones can be carried by the water flow and then smoothly sucked away, thereby improving the stone removal efficiency. However, the stone removal effect is still limited, especially for the stones deposited in the lower calyx, which makes it difficult to remove the stones completely. Summary of the invention

[0004] The purpose of the present application is to provide a front end component, an insertion portion and an endoscope to solve the above-mentioned technical problems existing in the prior art.

[0005] This application is implemented as follows: In the first aspect, an embodiment of the present application provides a front end component, which is applied to an endoscope, and includes a front end seat, a passive component and a piezoelectric sheet; the front end seat has an instrument channel; the passive component is an annular structure, the passive component has a connecting portion, the connecting portion is fixedly installed in the instrument channel, the distal end of the passive component is a mobile end, the mobile end has at least two moving parts distributed along the circumference of the passive component, and at least part of the moving part is located in the instrument channel; the piezoelectric sheet is installed between the moving part and the inner wall of the instrument channel, the piezoelectric sheet is connected to a power line, and the piezoelectric sheet can be energized and deformed to drive the moving part to deform, thereby changing the inner diameter size of the mobile end.

[0006] In a second aspect, an embodiment of the present application provides an insertion portion, comprising a front end assembly provided in the embodiment of the first aspect.

[0007] In a third aspect, an embodiment of the present application provides an endoscope, comprising the insertion portion provided by the embodiment of the second aspect.

[0008] The technical solution provided by this application can achieve the following beneficial effects: In the present application, a passive component is installed in the instrument channel, and the distal end of the passive component is a moving end. The moving end includes at least two moving parts distributed along the circumference of the passive component, and a piezoelectric sheet is arranged to cooperate with the moving part. Since the piezoelectric sheet can be deformed after being energized, the deformation of the piezoelectric sheet can be used to drive the deformation of the moving part. Since the moving end corresponding to the moving part is a ring structure, after the moving part is deformed and the position changes, the inner diameter size of the moving end will change accordingly; by changing the inner diameter size of the moving end, the water outlet diameter of the instrument channel is changed, and by controlling the voltage and frequency of the piezoelectric sheet, the water outlet diameter of the instrument channel can be intermittently changed, so that the water flow can quickly increase and decrease the pressure in a short time to form a pulse; the pulsed water flow can cause disturbances in the liquid in the lower cup, so that the stones and sediments at the bottom of the lower cup or close to the wall of the lower cup can change their positions, so as to facilitate the suction of the negative pressure suction sheath, thereby increasing the probability of stones, sediments, etc. being discharged out of the human body. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0010] Figure 1 is a schematic diagram of the overall structure of the front-end components provided in some embodiments of the present application; Figure 2 is a cross-sectional view of a front end assembly provided in some embodiments of the present application Figure 1 ; Figure 3 About Figure 2 Detailed view of point A; Figure 4 is a cross-sectional view of a front end assembly provided in some embodiments of the present application Figure 2 ; Figure 5 It is a schematic diagram of the disassembly of the front-end components provided in some embodiments of the present application; Figure 6 is a cross-sectional view of a front end assembly provided in some embodiments of the present application Figure 3 ; Figure 7 is a cross-sectional view of the front end seat provided in some embodiments of the present application Figure 1 ; Figure 8 is a cross-sectional view of the front end seat provided in some embodiments of the present application Figure 2 ; Fig. 9 This is a schematic diagram of the structure of the passive components provided in some embodiments of the present application. Figure 1 ; Fig.10 This is a schematic diagram of the structure of the passive components provided in some embodiments of the present application. Figure 2 ; Fig.11 This is a schematic diagram of the structure of the passive components provided in some embodiments of the present application. Figure 3 ; Fig.12 This is a schematic diagram of the structure of the passive components provided in some embodiments of the present application. Figure 4 ; Fig.13 It is a schematic diagram of the cooperation between the passive component, the piezoelectric sheet and the sealing component provided in some embodiments of the present application; Fig.14 It is a schematic diagram of the structure of an endoscope provided in some embodiments of the present application.

[0011] In the figure: 100-front end seat, 110-instrument channel, 111-limiting block, 112-limiting groove, 200-passive part, 210-connecting part, 220-moving end, 221-moving part, 221a-installing groove, 221b-abutment section, 222-active gap, 223-through hole, 300-piezoelectric sheet, 400-power cord, 500-seal, 600-glue layer, 710-PCB, 720-camera module, 800-insertion part, 810-instrument tube, 900-endoscope handle. DETAILED DESCRIPTION

[0012] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0013] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0014] In each embodiment of the present application, "proximal end" and "distal end" refer to the position of the endoscope and its accessories relative to the user in the use environment, wherein the end closer to the user is designated as the "proximal end" and the end farther from the user is designated as the "distal end".

[0015] The present application embodiment provides a front-end component, referring to Figures 1 to 6 As shown, the front end assembly includes a front end seat 100, a passive component 200 and a piezoelectric sheet 300. The front end seat 100 is a part of the endoscope insertion part 800, located at the farthest end of the insertion part 800, and has an instrument channel 110. When the endoscope is inserted into the human body, the front end seat 100 is located at the front end and directly contacts the inner wall of the human body cavity.

[0016] During surgery, instruments such as laser fibers enter the human body through the instrument channel 110. At the same time, liquids and the like can also be injected into the human body through the instrument channel 110. The insertion portion 800 also includes an instrument tube 810. The proximal end of the instrument tube 810 is connected to the handle of the endoscope to facilitate the insertion of various instruments. The distal end of the instrument tube 810 extends to the location of the front seat 100 and is inserted into the instrument channel 110. Figures 2 to 4 The instrument tube 810 may not be inserted into the instrument channel 110, but the distal end of the instrument tube 810 may directly connect with the proximal end of the instrument channel 110, the instrument tube 810 and the instrument channel 110 are connected, and the instrument or liquid passing through the instrument tube 810 can be output to the outside of the front end seat 100 through the instrument channel 110.

[0017] The passive component 200 is an annular structure, and has a connecting portion 210, which is fixedly installed in the instrument channel 110, and the passive component 200 is fixedly connected to the instrument channel 110 through the connecting portion 210. The distal end of the passive component 200 is a mobile end 220, which is a part of the passive component 200, and the mobile end 220 is also an annular structure. The mobile end 220 has at least two mobile portions 221 distributed along the circumference of the passive component 200, and at least part of the mobile portion 221 is located in the instrument channel 110.

[0018] When the instrument tube 810 is installed in the instrument channel 110, the connecting portion 210 is indirectly fixed to the instrument channel 110 through the instrument tube 810, the connecting portion 210 is fixed to the instrument tube 810, and the instrument tube 810 is fixed to the instrument channel 110. In other embodiments, the instrument tube 810 and the passive component 200 may be sequentially installed in the instrument channel 110 along the axial direction of the instrument channel 110, see Figure 2 , Figure 4 as well as Figure 6 shown.

[0019] The piezoelectric sheet 300 is installed between the moving part 221 and the inside of the instrument channel 110. The piezoelectric sheet 300 is installed in the space between the passive part 200 and the inner wall of the instrument channel 110. When the endoscope is used, various instruments and liquids to be transported are output from the annular cavity of the passive part 200. Therefore, the inner diameter of the moving end 220 is actually the water outlet diameter of the instrument channel 110, which is the actual liquid outlet.

[0020] The piezoelectric sheet 300 is connected to a power line 400, and the piezoelectric sheet 300 can be energized and deformed when the power line 400 is energized. The piezoelectric sheet 300 is a thin sheet made of piezoelectric material, and its working principle is based on the piezoelectric effect. When an electric field is applied to the piezoelectric material, the piezoelectric material will deform, which is called the inverse piezoelectric effect. When an external voltage is applied to the piezoelectric sheet 300, the piezoelectric sheet 300 will undergo significant mechanical deformation according to the change in the magnitude and frequency of the voltage, and convert electrical energy into mechanical energy.

[0021] The piezoelectric sheet 300 deformed by power on can drive the moving part 221 to deform, thereby changing the inner diameter of the moving end 220. After the piezoelectric sheet 300 is powered on, the piezoelectric sheet 300 will deform. Since it is installed between the moving part 221 and the instrument channel 110, the piezoelectric sheet 300 has no deformation space. Therefore, when the piezoelectric sheet 300 deforms, it will also drive the moving part 221 to deform synchronously.

[0022] The mobile end 220 is an annular structure and is composed of at least two mobile parts 221 distributed along its circumference. After the mobile part 221 is deformed, its position will also change, so that the inner diameter size of the mobile end 220 changes. By changing the voltage and frequency of the piezoelectric sheet 300, the deformation direction of the piezoelectric sheet 300 is controlled. When the piezoelectric sheet 300 is deformed toward the center of the instrument channel 110, the mobile part 221 approaches the center of the instrument channel 110, and the inner diameter size of the mobile end 220 is reduced; when the piezoelectric sheet 300 is deformed toward the inner wall of the instrument channel 110, the mobile part 221 approaches the center of the instrument channel 110, and the inner diameter size of the mobile end 220 increases.

[0023] The outlet of the mobile end 220 changes, and correspondingly, the water outlet diameter of the instrument channel 110 also changes, and the pressure of the liquid output from the instrument channel 110 also changes. By controlling the power-on voltage and frequency of the piezoelectric sheet 300, the water outlet diameter of the instrument channel 110 changes intermittently, so that the water flow increases and decreases the pressure rapidly in a short time, forming a pulse, and the pulse water flow can disturb the accumulated liquid, stones and sediments in the lower cup, so that the stones and sediments located at the bottom of the lower cup or close to the wall of the lower cup can change their positions, which is convenient for the negative pressure suction sheath to perform suction, and the probability of stones, sediments, etc. being discharged out of the human body is increased, solving the problem of unsatisfactory lithotripsy effect in the prior art.

[0024] The moving part 221 is deformed under the drive of the piezoelectric sheet 300. In some embodiments, the piezoelectric sheet 300 and the moving part 221 are fixedly connected to ensure that when the piezoelectric sheet 300 is deformed, the moving part 221 can follow the deformation and movement of the piezoelectric sheet 300. In other embodiments, the piezoelectric sheet 300 and the moving part 221 may be in abutment fit, and the moving part 221 has a good ability to restore deformation. After the piezoelectric sheet 300 drives the moving part 221 to move close to the center of the instrument channel 110, when the piezoelectric sheet 300 is deformed toward the inner wall of the instrument channel 110, the moving part 221 can move close to the piezoelectric sheet 300 under its own ability to restore deformation to restore the deformation.

[0025] In some embodiments, an airbag can be used instead of the above-mentioned piezoelectric sheet 300. After the airbag is inflated, it can also drive the moving part 221 to move, reduce the inner diameter of the moving end 220, and after the airbag is deflated and reduced, expand the inner diameter of the moving end 220. However, compared with the use of the piezoelectric sheet 300, the process of controlling the inner diameter of the moving end 220 by the airbag is longer, and it is not possible to cause the water flow to increase and reduce the pressure quickly in a short time. The pulsed water flow formed has a poor effect, and the disturbance effect on the stone precipitation in the lower cup is poor.

[0026] In some embodiments of the present application, reference Figures 2 to 6 As shown, the front end assembly also includes a seal 500, which is an annular structure made of elastic material. The seal 500 is sleeved outside the moving end 220 and is located at the far end of the piezoelectric sheet 300. The seal 500 is tightly arranged between the moving part 221 and the inner wall of the instrument channel 110. The seal 500 plays a role in sealing the gap between the moving part 221 and the inner wall of the instrument channel 110.

[0027] Since the mobile end 220 includes at least two mobile parts 221, and there is a gap between the two mobile parts 221, the liquid input into the instrument channel 110 will be diverted from the gap between the two mobile parts 221, which will affect the pressure of the output liquid. Therefore, a seal 500 is provided to seal the gap between the mobile part 221 and the inner wall of the instrument channel 110, thereby ensuring that the liquid in the instrument channel 110 is only output from the annular cavity of the mobile end 220. Regardless of whether the mobile part 221 is deformed, the seal 500 is always pressed tightly between the mobile part 221 and the instrument channel 110, filling the gap between the mobile part 221 and the instrument channel 110 to achieve sealing.

[0028] The sealing member 500 and the piezoelectric sheet 300 are both pressed tightly between the moving part 221 and the inner wall of the instrument channel 110, and the sealing member 500 is located at the far end of the piezoelectric sheet 300. The piezoelectric sheet 300 is farther from the end surface of the moving end 220 than the sealing member 500. When the piezoelectric sheet 300 drives the moving part 221 to deform, the deformation degree of the end of the moving part 221 is higher, and the change of the inner diameter of the moving end 220 is greater.

[0029] When the moving part 221 is not deformed, the inner diameter of the moving end 220 is relatively large, and the inner diameter of the sealing member 500 is stretched and expanded to be mounted outside the moving end 220. When the moving part 221 is deformed, the inner diameter of the moving end 220 is reduced, and the inner diameter of the sealing member 500 is reduced, and is tightly mounted outside the moving end 220. Since the sealing member 500 is an annular structure, the sealing member 500 can cause the cross section of the channel formed by the moving end 220 to be roughly circular, so that the liquid output from the passive member 200 can maintain a cylindrical shape, so that the liquid has a better gathering effect after being ejected, and the disturbance effect on the liquid stones in the lower cup is improved.

[0030] It should be noted that even if the piezoelectric film 300 is not energized and deformed, the seal 500 cannot independently drive the movable portion 221 to deform toward the center of the instrument channel 110, thereby ensuring that the movable portion 221 can only deform and move under the drive of the piezoelectric film 300, thereby ensuring the accuracy of the pulse water flow regulation.

[0031] The seal 500 can be made of rubber material, see Figure 3 As shown, the seal 500 may include a plurality of annular structures, which are arranged side by side outside the mobile end 220. The cross section of the annular structure may be square or circular. In some preferred embodiments, the annular structures with a square cross section are located at both ends, and the annular structure with a circular cross section is located in the middle. The annular structure with a circular cross section cannot fit completely, and a certain deformation space can be reserved so that the seal 500 is more snugly installed between the mobile end 220 and the inner wall of the instrument channel 110.

[0032] In some embodiments, reference Figure 5 , Figures 9 to 12As shown, the outer wall surface of the movable part 221 is provided with a mounting groove 221a, and the sealing member 500 is installed in the mounting groove 221a. The sealing member 500 is limited in the axial direction of the passive member 200 with the mounting groove 221a. The mounting groove 221a is used to limit the position of the sealing member 500 in the axial direction of the passive member 200. The movable part 221 is deformed, and the distal end of the movable part 221 is a free end, which is subject to the least constraint. The closer to the distal end of the movable part 221, the smaller the inner diameter of the movable end 220. The sealing member 500 is installed in the mounting groove 221a to avoid the situation that when the movable part 221 moves and the inner diameter of the movable end 220 becomes smaller, the sealing member 500 slides toward the distal end of the movable end 220, causing the sealing member 500 to be separated from the movable end 220.

[0033] The mobile end 220 is a part of the passive component 200 and is an annular structure. In some embodiments of the present application, the passive component 200 has at least two movable gaps 222, and the movable gaps 222 extend from the distal end surface of the mobile end 220 toward the proximal end of the mobile end 220 along the axial direction of the passive component 200. Figures 9 to 13 As shown, part of the movable end 220 between two adjacent movable gaps 222 forms a movable portion 221 .

[0034] The movable end 220 is divided by the movable gap 222, so that at least two movable parts 221 distributed along the circumference of the movable end 220 are formed. The movable gap 222 provides a structural condition for reducing the inner diameter of the movable end 220. After the edges of two adjacent movable parts 221 near the movable gap 222 abut against each other, the inner diameter of the movable end 220 is reduced to a minimum.

[0035] In some preferred embodiments, reference Figures 9 to 12 As shown, the mobile end 220 is provided with a through hole 223 penetrating its side wall, the through hole 223 connects the inner and outer sides of the mobile end 220, and the through hole 223 is connected to the active gap 222 and is located at the proximal end of the active gap 222, and the hole edge of the through hole 223 is in an arc structure. The arc structure can reduce stress concentration points, and when two adjacent mobile parts 221 are deformed and close to each other, stress concentration is not likely to occur at the joint position of the two mobile parts 221, which can effectively avoid the situation where the joint position of the two adjacent mobile parts 221 is torn or damaged.

[0036] Further preferably, the connecting portion 210 of the passive component 200 is a through hole 223 disposed on the moving end 220, and the passive component 200 can be fixed to the instrument channel 110 by using the through hole 223. Figures 9 and 10 As shown, the radial dimension of the through hole 223 is greater than the width dimension of the opening of the through hole 223 communicating with the active gap 222. Figure 7As shown, a limit block 111 is provided on the inner wall of the instrument channel 110. The limit block 111 is embedded in the through hole 223 to fix the relative position of the passive component 200 and the instrument channel 110. Since the limit block 111 is embedded in the through hole 223, the limit block 111 can support the edge of the through hole 223, improve the structural strength of the passive component 200, and avoid damage and tearing at the joint position of two adjacent moving parts 221.

[0037] In other embodiments of the present application, the connecting portion 210 is a protruding structure disposed on the outer wall of the passive component 200. Fig.11 As shown. Corresponding to the raised structure, refer to Figure 8 As shown, the inner wall of the instrument channel 110 is provided with a limiting groove 112. The connecting portion 210 is snapped into the limiting groove 112 to complete the fixation of the passive component 200 and the instrument channel 110.

[0038] The piezoelectric sheet 300 drives the moving portion 221 to deform and move. When the multiple moving portions 221 are all close to the axis of the passive component 200, the multiple moving portions 221 are close to each other, thereby reducing the inner diameter of the moving end 220. Figures 10 to 12 As shown, the distal end of the moving part 221 is provided with an abutment section 221b, and the width of the abutment section 221b gradually decreases from the proximal end of the passive member 200 to the distal end of the passive member 200. When the piezoelectric sheet 300 drives the moving part 221 to deform, the edges of the two adjacent abutment sections 221b can be tightly matched, referring to Fig.12 shown.

[0039] The distal end of the movable portion 221 is a free end and is subject to the least constraint. When the piezoelectric sheet 300 drives the movable portion 221 to deform and move, the distal end of the movable portion 221 moves the largest distance. Therefore, the width dimension of the abutment segment 221b is set to be smaller as it approaches the distal end, to match the moving distance of the movable portion 221, so that the edges of the two adjacent abutment segments 221b can fit tightly together, reducing the risk of liquid leakage from the active gap 222 between the two adjacent movable portions 221.

[0040] In some embodiments of the present application, reference Figures 1 to 4 As shown, the passive component 200 is entirely located in the instrument channel 110. During the process of inserting the endoscope into the human body, the passive component 200 will not affect the insertion process of the endoscope. Figure 6 As shown, the passive component 200 may also be only partially located within the instrument channel 110 .

[0041] The front-end assembly is also provided with a PCB 710, a camera module 720, etc. The camera module 720 is mounted on the distal end surface of the front-end seat 100, the PCB 710 is mounted inside the front-end seat 100, and the PCB 710 is connected to a signal line. Figure 4 and Figure 6 As shown, the PCB 710 is fixed by glue, and the glue forms a glue layer 600 after solidification.

[0042] In some specific embodiments, the power line 400 connected to the piezoelectric sheet 300 extends out from the instrument channel 110, so that the power line 400 is away from the humid environment in the instrument channel 110. When fixing the PCB 710, fill the glue to the position where the power line 400 extends out from the instrument channel 110. Figure 4 and Figure 6 As shown, glue is used to seal the opening of the instrument channel 110 to prevent leakage of the instrument channel 110 .

[0043] In some preferred embodiments of the present application, the mobile end 220 is provided with four mobile parts 221, and the four mobile parts 221 are evenly distributed along the circumference of the passive component 200. Corresponding to the mobile parts 221, four piezoelectric sheets 300 can also be provided, and the four piezoelectric sheets 300 are provided in a one-to-one correspondence with the four mobile parts 221, and at least two power lines 400 are provided, and two adjacent piezoelectric sheets 300 are respectively connected to different power lines 400.

[0044] In the case where two power lines 400 are provided, the same power line 400 is respectively connected to two moving parts 221 located in the same radial direction of the moving end 220. By controlling the voltage and frequency of the two power lines 400, the moving direction of the moving part 221 is controlled, so that the four moving parts 221 are deformed in the same direction, or the adjacent moving parts 221 are deformed in different directions, so that the shape of the outlet of the moving end 220 changes regularly, thereby improving the disturbance ability of the liquid.

[0045] In some embodiments, the power line 400 is a twisted pair line.

[0046] The present application embodiment also provides an insertion portion 800, referring to Fig.14 As shown, it includes the front end component provided by any of the above embodiments, and the front end component is located at the front end position of the insertion part 800.

[0047] The present application also provides an endoscope, referring to Fig.14 As shown, the endoscope comprises the insertion portion 800 provided in the above embodiment. The endoscope further comprises an endoscope handle 900, and the proximal end of the insertion portion 800 is mounted to the endoscope handle 900.

[0048] The endoscope provided in the embodiment of the present application may be a nephroscope, or a bronchoscope, esophagoscope, gastroscope, colonoscope, otoscope, rhinoscope, stomatoscope, laryngoscope, colposcope, laparoscope, arthroscope, etc. The embodiment of the present application does not impose any specific restrictions on the type of endoscope.

[0049] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0050] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A front end assembly, applied to an endoscope, characterized in that: include: A front end seat (100), wherein the front end seat (100) has an instrument channel (110); A passive component (200), the passive component (200) being an annular structure, the passive component (200) having a connecting portion (210), the connecting portion (210) being fixedly mounted in the instrument channel (110), the distal end of the passive component (200) being a moving end (220), the moving end (220) having at least two moving portions (221) distributed along the circumference of the passive component (200), and at least a portion of the moving portion (221) being located in the instrument channel (110); A piezoelectric sheet (300) is installed between the moving portion (221) and the inner wall of the instrument channel (110), the piezoelectric sheet (300) is connected to a power line (400), and the piezoelectric sheet (300) can be deformed by powering on, so as to drive the moving portion (221) to deform, thereby changing the inner diameter of the moving end (220).

2. A front end assembly according to claim 1, characterized in that: The front end assembly further comprises a sealing member (500), the sealing member (500) being an annular structure made of elastic material, the sealing member (500) being sleeved outside the movable end (220), the sealing member (500) being located at the distal end of the piezoelectric sheet (300), the sealing member (500) being tightly arranged between the movable portion (221) and the inner wall of the instrument channel (110) to seal the gap between the movable portion (221) and the instrument channel (110).

3. A front end assembly according to claim 2, characterized in that: The outer wall surface of the movable part (221) is provided with a mounting groove (221a), the sealing component (500) is mounted in the mounting groove (221a), and the sealing component (500) is limitedly matched with the mounting groove (221a) in the axial direction of the passive component (200).

4. A front end assembly according to claim 1, characterized in that: The passive component (200) has at least two movable gaps (222), the movable gaps (222) extending from the distal end surface of the movable end (220) toward the proximal end of the movable end (220) along the axial direction of the passive component (200), and the portion of the movable end (220) between two adjacent movable gaps (222) forms the movable portion (221); The movable end (220) is provided with a through hole (223) penetrating its side wall, the through hole (223) is connected to the movable gap (222) and is located at the proximal end of the movable gap (222), and the hole edge of the through hole (223) is in an arc structure.

5. A front end assembly according to claim 4, characterized in that: The connecting portion (210) is a through hole (223) provided at the movable end (220), and the radial dimension of the through hole (223) is greater than the width dimension of an opening of the through hole (223) communicating with the movable gap (222). A limit block (111) is provided on the inner wall of the instrument channel (110), and the limit block (111) is embedded in the through hole (223).

6. A front end assembly according to claim 1, characterized in that: The connecting portion (210) is a protruding structure arranged on the outer wall surface of the passive component (200), and the inner wall of the instrument channel (110) is provided with a limiting groove (112), and the connecting portion (210) is snap-fitted into the limiting groove (112).

7. A front end assembly according to claim 1, characterized in that: The distal end of the movable part (221) is provided with an abutment section (221b), and the width dimension of the abutment section (221b) gradually decreases along the direction from the proximal end of the passive component (200) to the distal end of the passive component (200), so that when the piezoelectric sheet (300) drives the movable part (221) to deform, the edges of two adjacent abutment sections (221b) can be tightly fitted.

8. A front end assembly according to claim 1, characterized in that: The moving end (220) is provided with four moving parts (221), and the four moving parts (221) are evenly distributed along the circumference of the passive component (200); Four piezoelectric sheets (300) are provided, and the four piezoelectric sheets (300) are provided in one-to-one correspondence with the four moving parts (221). There are at least two power lines (400), and two adjacent piezoelectric sheets (300) are respectively connected to different power lines (400).

9. An insertion portion, characterized in that: Comprising the front end assembly according to any one of claims 1 to 8.

10. An endoscope, characterized in that: Comprising the insertion portion (800) described in claim 9.

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