CN116138709A - Insertion part and endoscope - Google Patents

Abstract

The application discloses an insertion part and an endoscope, and relates to the technical field of medical instruments. The insertion part disclosed by the application is used for an endoscope and comprises a front end seat, an instrument tube and an active bending section, wherein the distal end of the instrument tube is fixedly arranged on the front end seat, the instrument tube applies traction force to the front end seat, and the front end seat is in pretightening abutting connection with the distal end of the active bending section through the traction of the instrument tube; the insertion part further comprises at least one elastic piece, the elastic piece is arranged on the first abutting surface of the front end seat and/or the second abutting surface of the active bending section, and the elastic piece is positioned on the offset side of the instrument tube in the circumferential direction of the insertion part. The scheme can optimize the stress distribution between the front end seat and the active bending section.

Description

Insertion part and endoscope

Technical Field

The present application relates to the technical field of medical instruments, and in particular, to an insertion portion and an endoscope.

Background

With the continuous development of medical technology, endoscopes are widely used in the diagnosis and treatment process of diseases. In the process of using the endoscope, the direction of the front end can be adjusted by bending the insertion part, so that the image information of the target part can be obtained.

In the related art, a traction force may be applied to the front end seat of the front end assembly through the instrument tube to pre-tighten the front end seat against the distal end of the active bending section to achieve a secure assembly of the two. However, when the insertion part with the structural layout is actually used, the front end seat and the active bending section are easy to relatively deflect, and even the butt joint of the front end seat and the active bending section is obviously damaged mechanically.

Disclosure of Invention

The embodiment of the application provides an insertion part and an endoscope, which can optimize stress distribution between a front end seat and an active bending section.

In order to solve the above problems, the embodiment of the present application adopts the following technical solutions:

in a first aspect, embodiments of the present application provide an insertion portion for an endoscope. The insertion part comprises a front end seat, an instrument tube and an active bending section, wherein the distal end of the instrument tube is fixedly arranged on the front end seat, the instrument tube applies traction force to the front end seat, and the front end seat is in pretightening abutting connection with the distal end of the active bending section through the traction of the instrument tube;

the insertion part further comprises at least one elastic piece, the elastic piece is arranged on the first abutting surface of the front end seat and/or the second abutting surface of the active bending section, and the elastic piece is positioned on the offset side of the instrument tube in the circumferential direction of the insertion part.

In a second aspect, embodiments of the present application provide an endoscope, including a handle and an insertion portion according to the first aspect of embodiments of the present application, the handle being connected to the insertion portion.

The technical scheme adopted by the embodiment of the application can achieve the following beneficial effects:

in the insertion portion and the endoscope disclosed by the embodiment of the application, the elastic piece is arranged between the front end seat and the active bending section and on one biased side of the instrument tube, and in the pretightening and abutting process of the front end seat and the active bending section, the elastic piece can consume the action of the front end seat on the biased side of the instrument tube through elastic deformation, so that the problem of uneven stress distribution between the front end seat and the distal end of the active bending section is relieved, and the situation of relative deflection between the front end seat and the distal end of the active bending section is avoided.

Meanwhile, the elastic piece is extruded between the front end seat and the active bending section to store energy, and the elastic characteristic of the elastic piece determines that the elastic piece can apply resilience force to the front end seat or the distal end of the active bending section through energy release, so that the pre-tightening effect between the front end seat and the active bending section can be enhanced.

Compared with the prior art, the insertion part disclosed by the embodiment of the application can avoid the condition of relative deflection between the front end seat and the active bending section, so that the coaxiality of the insertion part is improved, mechanical damage caused by stress concentration is prevented, and meanwhile, the pre-tightening effect between the front end seat and the active bending section can be enhanced due to the rebound characteristic of the elastic piece, so that the assembly reliability between the front end seat and the active bending section can be improved.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute an undue limitation to the application.

In the drawings:

FIG. 1 is a schematic illustration of an insert disclosed in some embodiments of the present application;

fig. 2 is a schematic structural view (hidden part front end seat) of an insertion part disclosed in the first embodiment of the present application and a partial enlarged view at a therein;

FIG. 3 is a schematic view of the structure of a distal snake bone according to the first embodiment of the invention;

FIG. 4 is a schematic view of a distal snake bone according to the second embodiment of the invention;

FIG. 5 is a schematic view of a distal snake bone according to the third embodiment of the invention;

FIG. 6 is a schematic view of a distal snake bone according to the fourth embodiment of the invention;

FIG. 7 is a schematic view of a distal snake bone according to the fifth embodiment of the invention;

FIG. 8 is a schematic view of a distal snake bone according to the sixth embodiment of the invention;

FIG. 9 is a schematic layout view of an elastic member in an insertion portion according to a seventh embodiment of the present disclosure;

fig. 10 is a schematic layout view of an elastic member in an insertion portion according to an eighth embodiment of the present application.

Reference numerals illustrate:

100-front end component, 110-front end seat, 111-main body, 111 a-first step part, 112-partition board, 120-camera, 130-light source, 140-circuit board,

200-active bending section, 210-distal snake bone, 211-second step, 212-second abutment surface, 220-engaging snake bone,

300 a-first elastic member, 300 b-second elastic member, 310-notch, 320-arm,

C-deformation gap, 400-instrument tube and R-traction rope.

Detailed Description

For the purposes, technical solutions and advantages of the present application, the technical solutions of the present application will be clearly and completely described below with reference to specific embodiments of the present application and corresponding drawings. It will be apparent that the described embodiments are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.

In the various embodiments of the present application, "proximal" and "distal" refer to the endoscope and its accessories in the environment of use, relative to the user's proximal-distal position, 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".

The following describes in detail the technical solutions disclosed in the embodiments of the present application with reference to the accompanying drawings.

In the related art, the inventor applies a traction force to the front end seat through the instrument tube by means of pretensioning the instrument tube, thereby pretensioning the front end seat against the distal end of the active bending section to improve the assembly efficiency of the insertion portion. However, in practical use of the endoscope based on the above technology, it has been found that the distal end of the active bending section and the front end assembly are prone to relative deflection, which may be at least manifested by poor coaxiality of the insertion portion, and meanwhile, there is relatively obvious mechanical damage at the junction between the front end seat and the distal end of the active bending section.

As a result of further research, the inventors have found that the above-described problem is caused by the offset arrangement of the instrument tube at the front end seat. In particular, in view of the structural layout of the front end assembly, the instrument tube needs to be arranged offset from the central axis of the insertion portion, i.e. offset in the front end seat, whereas the instrument tube needs to apply a traction force to the front end seat, which is a biasing force with respect to the front end seat, in the case of pulling the front end seat pre-fastened to the distal end of the active bending section, the force distribution of the two at the abutment is not uniform, resulting in a relative deflection; meanwhile, because the stress distribution between the two parts is uneven, the parts with larger stress are easy to be mechanically damaged due to stress concentration.

In this regard, some embodiments of the present application provide an insertion portion for an endoscope.

Referring to fig. 1 to 10, the insertion portion disclosed in the embodiments of the present application includes a front end seat 110, an instrument tube 400 and an active bending section 200, wherein a distal end of the instrument tube 400 is fixedly mounted on the front end seat 110, the instrument tube 400 applies traction force to the front end seat 110, and the front end seat 110 is preloaded against a distal end of the active bending section 200 by traction of the instrument tube 400.

Specifically, the insert includes a front end assembly 100, and the front end mount 110 is the basic structure of the front end assembly 100, which provides a mounting base for the camera 120, the light source 130, the circuit board 140, etc., and of course, also protects these structures. Of course, the front end housing 110 is also the mounting base for the distal end of the instrument tube 400.

The camera 120 may be provided at a front end surface side of the front end seat 110 to photograph a target site (e.g., a lesion) in case that the insertion portion enters a human body cavity. The light source 130 is also provided on the front end face side of the front end group, and is capable of illuminating the area toward which the front end module 100 is directed. The circuit board 140 can power the camera 120 and the light source 130, and also be used to implement signal interaction. The instrument tube 400 is used to deliver a treatment instrument into a body lumen and to aspirate tissue fluid.

The front end assembly 100 may be assembled by various methods, as shown in fig. 2, the front end base 110 includes a main body 111 and a partition 112, the partition 112 may isolate an installation space inside the main body 111, the distal ends of the camera 120, the light source 130, the circuit board 140 and the instrument tube 400 may be disposed in the installation space, and the integral formation of the structures such as the main body 111, the partition 112, the camera 120, the light source 130, the circuit board 140 and the distal end of the instrument tube 400 may be achieved by injecting glue into the installation space. In further embodiments, the front end assembly 100 and the distal end of the instrument tube 400 may be integrally injection molded to provide a machined assembly.

As for the active bending section 200, as the bending action body 111 of the insertion portion, a snake bone structure may be adopted, or an integral cutting structure may be adopted, and the type thereof is not limited in the embodiments of the present application.

In the embodiment of the active bending section 200 with a snake bone structure, the front seat 110 is in pre-tightening abutting connection with the distal side of the distal snake bone 210; the active bending section 200 further comprises a plurality of connected snake bones 220 which are connected in turn in a rotating manner, wherein the connected snake bone 220 at the foremost end is connected with the distal snake bone 210 in a rotating manner and rotates along with the distal snake bone 210. Specifically, the active bending section 200 is pulled by the traction rope R to perform the bending operation.

It will be appreciated that since the instrument tube 400 is fixedly coupled to the front end housing 110, the instrument tube 400 may transmit forces to the front end housing 110. In the present embodiment, the instrument tube 400 is adapted to bear a traction force F (see the dashed arrow in the drawing), and by conducting the traction force F to the front end seat 110, the front end seat 110 and the distal end of the active bending section 200 are brought close to each other and the proximal side of the front end seat 110 is pulled to abut against the distal end of the active bending section 200 during the assembly of the front end assembly 100 and the active bending section 200. Of course, during the process of transmitting the traction force F to the front end seat 110, there may be a loss of the traction force F, that is, the front end seat 110 is stressed less than the traction force F or approximately the traction force F, but for convenience of the travel, the front end seat 110 is still subjected to the traction force F.

It should be noted that, the traction force F applied to the instrument tube 400 according to the embodiment of the present application can make the front end seat 110 pretension against the distal end of the active bending section 200, specifically can achieve the effect of pretension fixation between the proximal side of the front end seat 110 and the distal end of the active bending section 200, so that the front end seat 110 and the active bending section 200 can bear a certain external force at the abutting joint without detachment, that is, the traction force F makes a certain connection reliability between the proximal side of the front end seat 110 and the distal end of the active bending section 200. Of course, the instrument tube 400 may be pre-tensioned on its proximal side to maintain the instrument tube 400 in a more tensioned state while ensuring that it is always capable of pulling the front end mount 110 pre-tensioned against the distal end of the active bending section 200.

Based on the above analysis, when the front end assembly 100 of the embodiment of the present application is assembled with the active bending section 200, the traction force F can be applied to the front end seat 110 by pulling the instrument tube 400 while the instrument tube 400 is inserted into the active bending section 200, and the front end seat 110 is pretensioned against the distal end of the active bending section 200, which can, of course, adjust the alignment of the front end seat 110 and the active bending section 200 in good time during the pulling process.

Meanwhile, in the embodiment of the present application, the insertion portion further includes at least one elastic member (including the first elastic member 300a and/or the second elastic member 300b shown in the drawings), the first abutment surface of the front end seat 110 and/or the second abutment surface 212 of the active bending section 200 are provided with elastic members, and the elastic members are located at the offset side of the instrument tube 400 in the circumferential direction of the insertion portion.

It will be appreciated that the insert may comprise a plurality of resilient members, or may comprise only one resilient member; in the abutting surface of the front end seat 110 and the abutting surface of the active bending section 200, only one or both of the abutting surfaces may be provided with an elastic member, and as shown in fig. 2, the elastic member may be provided on the second abutting surface 212 of the active bending section 200. The first abutment surface of the front end seat 110 refers to an abutment surface that is in pre-tightening abutment with the active bending section 200, and the second abutment surface 212 of the active bending section 200 refers to an abutment surface that is in pre-tightening abutment with the front end seat 110.

With this arrangement, the elastic member can provide elastic support between the front end seat 110 and the opposite abutment surface of the active bending section 200.

Specifically, during the process of pulling the front end seat 110 by the instrument tube 400, the elastic member is pressed by the biased side of the instrument tube 400 on the front end seat 110, along with the continuous increase of the traction force F of the instrument tube 400, the elastic member is compressed, and absorbs part of the traction force F of the front end seat 110 on the biased side of the instrument tube 400 through elastic deformation to store energy, so that the elastic member can consume part of the acting force of the front end seat 110 on the biased side of the instrument tube 400, and the problem of uneven stress distribution between the front end seat 110 and the distal end of the active bending section 200 is relieved to a certain extent, thereby avoiding the situation of relative deflection between the front end seat and the active bending section 200.

Meanwhile, since the elastic member is compressed between the front end seat 110 and the distal end of the active bending section 200 to store energy, the elastic property of the elastic member determines that the elastic member can exert a resilience force on the front end seat 110 or the distal end of the active bending section 200 through energy release, and in the case that the front end seat is in pre-tightening abutment with the active bending section, the pre-tightening effect between the front end seat 110 and the active bending section 200 includes the traction force exerted by the instrument tube 400 to the front end seat 110, and the resilience force of the elastic member is superimposed, so that the abutment stability between the front end seat 110 and the distal end of the active bending section 200 can be significantly improved.

Compared with the related art, the insertion part disclosed in the embodiment of the present application has the elastic supporting function between the front end seat 110 and the active bending section 200 and on the biased side of the instrument tube 400 by arranging the elastic element between the abutting surfaces of the front end seat 110 and the active bending section 200, so that the problem of uneven stress between the front end seat 110 and the active bending section 200 can be relieved, the coaxiality of the insertion part is improved, and the mechanical damage caused by stress concentration can be prevented; meanwhile, the resilience characteristic of the elastic member can further strengthen the pre-tightening effect between the front end seat 110 and the active bending section 200, so as to improve the abutting stability between the front end seat and the active bending section, i.e. improve the assembly reliability between the front end seat and the active bending section.

In embodiments of the present application, the type of resilient member may be various, for example, it may be a separate member such as a spring.

In another embodiment, as shown in fig. 2 and 3, the elastic member is integrally formed on the front end seat 110 or the active bending section 200, so that the number of components of the insertion portion can be reduced, the machining assembly process can be reduced, and meanwhile, the installation strength of the elastic member integrally formed with the front end seat 110 or the active bending section 200 is better.

Further, as shown in fig. 2 and 3, a deformation gap C is provided between the elastic member and the front end seat 110 or the active bending section 200. It can be appreciated that the deformation gap C can reduce the rigidity of the elastic member, and avoid the elastic member from making rigid contact with the abutment surface of the front end seat 110 or the active bending section 200, so that the elastic member is easier to elastically deform and plays a role in elastically supporting during the pre-tightening installation process of the front end seat 110 and the active bending section 200.

Optionally, the deformation gap C can be formed by laser cutting, so that the processing efficiency can be remarkably improved, and the cost is reduced.

As shown in fig. 4, 5 and 7, in some embodiments of the present application, the elastic member is provided with a notch 310, and the notch 310 communicates with the deformation gap C. With this arrangement, the notch 310 allows the elastic member to be in an open configuration, which further reduces the stiffness of the elastic member to make it easier to elastically deform. Of course, as shown in fig. 3, the elastic member is of a closed structure.

In the open elastic member, the structural characteristics of the elastic member may be different according to the different arrangement positions of the notch 310. As shown in fig. 4, the notch 310 is disposed adjacent to the second abutment surface 212 of the active bending section 200, such that the elastic member includes an arm 320; as shown in fig. 5, the notch 310 is disposed in the middle of the elastic member, and the notch 310 and the deformation slit C define two opposite arms 320 of the elastic member.

In the embodiments of the present application, there are various arrangements of the elastic members, as shown in fig. 3 to 5, at least one of the elastic members includes a first elastic member 300a disposed on a first radial line l of the insertion portion, where the first radial line l of the insertion portion passes through an axis of the insertion portion and an axis of the instrument tube 400, so as to perform an elastic supporting function at a maximum biasing force component of the traction force F applied by the instrument tube 400; as shown in fig. 6 and 7, at least one elastic member includes a plurality of second elastic members 300b disposed at both sides of a first radial line l of the insertion portion, so that the plurality of second elastic members 300b at both sides of the first radial line l together function as an elastic support, reducing stress loss of a single second elastic member 300 b; as shown in fig. 8, in the circumferential direction of the insertion portion, a first elastic member 300a and a second elastic member 300b are provided at the same time.

It should be noted that, the second elastic member 300b can share the pre-tightening and pressing action of the first elastic member 300a, so as to avoid the first elastic member 300a from being damaged due to stress concentration.

As shown in fig. 5, in some embodiments of the present application, the two arms 320 of the first elastic member 300a are symmetrically disposed with respect to the first radial line l. Under such a layout, the two support arms 320 can also share the stress uniformly under the condition of playing a role of elastic support together, so that the problem of relative deflection at the first elastic element 300a can be avoided when the front end seat 110 is in pre-tightening abutting with the active bending section 200.

And/or, as shown in fig. 10, in some embodiments of the present application, in the same second elastic member 300b, the arm 320 near the first radial line l is higher than the arm 320 far from the first radial line l; the first radial line l passes through the axis of the insertion portion and the axis of the instrument tube 400.

It should be noted that fig. 10 is a schematic layout view of the elastic member in the insertion portion, and the elastic member is shown in the circumferential direction of the front end seat 110 or the active bending section 200, so as to facilitate the display of the difference between different elastic members.

It will be appreciated that in the circumferential direction of the insertion portion and in the direction away from the first radial line l, the biasing force component of the traction force of the instrument tube 400 pulling the front end seat 110 will gradually decrease, that is, in the same second elastic member 300b, the arm 320 closer to the first radial line l is subjected to a larger pre-tightening pressure, and the arm 320 further from the first radial line l is subjected to a smaller pre-tightening pressure, so that the heights of the two arms 320 in the second elastic member 300b of this embodiment have a height difference, the arm 320 closer to the first radial line l can achieve an elastic supporting effect between the front end seat 110 and the active bending section 200 earlier, the arm 320 further from the first radial line l can achieve an elastic supporting effect between the front end seat 110 and the active bending section 200 later through a larger elastic deformation, and the arm 320 further from the first radial line l can significantly help to avoid the problem of uniformly biasing the two arms 320 b in the pre-tightening of the front end seat 110 and the active bending section 200 at the second elastic member 300b.

As shown in fig. 8 and 9, the elastic member is plural, and the number or cross-sectional area of the deformation slits C in the elastic member gradually decreases in the circumferential direction of the insertion portion and in the direction away from the first radial line l of the insertion portion.

It should be noted that fig. 9 is a schematic layout view of the elastic member in the insertion portion, and the elastic member is shown in the circumferential direction of the front end seat 110 or the active bending section 200, so as to facilitate the display of the difference between different elastic members.

It will be appreciated that, in the elastic member integrally formed with the front end seat 110 or the active bending section 200, the size of the deformation slits C directly correlates with the rigidity of the elastic member, and the number of the deformation slits C and the cross-sectional area are larger in the elastic member closer to the first radial line l, so that the overall rigidity thereof is smaller, which is beneficial to consuming a larger biasing force component in traction force through larger-amplitude elastic deformation, while the number of the deformation slits C and the cross-sectional area are smaller in the elastic member farther from the first radial line l, the overall rigidity thereof is larger, which can be used to consume a smaller biasing force component in traction force, which is beneficial to improving the uniformity of the stress distribution of different elastic members in the circumferential direction of the insertion portion, so as to prevent the occurrence of relative deflection between the front end seat 110 and the active bending section 200.

As shown in fig. 4, 5 and 7, in some embodiments of the present application, the deformation slit C is at least partially disposed below the respective abutment surface of the front end seat 110 or the active bending section 200 in the axial direction of the insertion portion. It can be understood that under such a structural layout, when the front end seat 110 is in pre-tightening abutment with the active bending section 200, the elastic member is under the abutment surface when being pressed into the deformation gap C, as shown in fig. 4, 5 and 7, the arm 320 is pressed beyond the second abutment surface 212, so that the elastic member can be prevented from forming a protrusion between the first abutment surface of the front end seat 110 and the second abutment surface 212 of the active bending section 200, thereby ensuring that the abutment surfaces therebetween achieve smooth abutment, and improving the stability and reliability of the abutment therebetween.

As shown in fig. 2, in some embodiments of the present application, the proximal end of the front end seat 110 is provided with a first step portion 111a, the distal end of the active bending section 200 is provided with a second step portion 211, and the step surface of the first step portion 111a and/or the step surface of the second step portion 211 is provided with an elastic member.

It is understood that only one of the first step portion 111a and the second step portion 211 may be provided with an elastic member, as shown in fig. 2, which is provided on a step surface of the second step portion 211; of course, the first step 111a and the second step 211 may each be provided with an elastic member.

With this arrangement, the front end seat 110 and the active bending section 200 can be axially abutted by the first step portion 111a and the second step portion 211 to achieve an abutting fit relationship that the front end seat 110 is preloaded and abutted against the distal end of the active bending section 200, that is, the first abutting surface of the front end seat 110 includes the step surface of the first step portion 111a, and the second abutting surface 212 of the active bending section 200 includes the step surface of the second step portion 211. Meanwhile, the matching of the first step portion 111a and the second step portion 211 ensures that the front end seat 110 and the distal end of the active bending section 200 are in a sleeved matching relationship, so that the front end seat 110 and the active bending section 200 are prevented from being separated radially. Of course, in other embodiments, the distal end of the active bending section 200 may be directly inserted into the front end housing 110 to achieve a socket fit.

As shown in fig. 8, in some embodiments of the present application, the number of elastic members is plural, and the height of the elastic members gradually decreases in the circumferential direction of the insertion portion and in a direction away from the first radial line l of the insertion portion; the first radial line l passes through the axis of the insertion portion and the axis of the instrument tube 400. For example, in the embodiment shown in fig. 8, the first elastic member 300a located on the first radial line l has a height h1, and the second elastic members 300b on both sides thereof have a height h2, where h2 is smaller than h1.

It will be appreciated that the biasing force component of the traction force F of the instrument tube 400 pulling the front end seat 110 in the circumferential direction of the insertion portion and away from the first radial line l will be gradually reduced, in which embodiment there is a height difference between the resilient members distributed in the circumferential direction of the insertion portion, the resilient members closer to the first radial line l of the insertion portion can achieve a resilient supporting effect between the front end seat 110 and the active bending section 200 earlier, which may consume the biasing force component of the traction force F by a larger resilient deformation, and the resilient supporting effect between the front end seat 110 and the active bending section 200 can achieve a resilient supporting effect between the resilient members farther from the first radial line l later, which may consume the biasing force component of the traction force F by a smaller resilient deformation, which obviously helps to uniformly share the stress of the different resilient members during the pre-tightening abutment of the front end seat 110 and the active bending section 200, thereby avoiding the occurrence of a relative deflection problem in the circumferential direction of the insertion portion.

In this embodiment, the elastic member may be a separate member such as a spring.

And/or, in some embodiments of the present application, the elastic member is plural, and the rigidity of the elastic member gradually increases in the circumferential direction of the insertion portion and in a direction away from the first radial line l of the insertion portion; the first radial line l passes through the axis of the insertion portion and the axis of the instrument tube 400.

It will be appreciated that the biasing force component of the traction force F of the instrument tube 400 pulling the front end seat 110 in the circumferential direction of the insertion portion and away from the first radial line l will gradually decrease, and in this embodiment, with such an arrangement, the spring closer to the first radial line l will have a smaller stiffness, which may consume a larger biasing force component of the traction force F by a larger magnitude of elastic deformation, while the spring farther from the first radial line l will have a larger stiffness, which is used to consume a smaller biasing force component of the traction force F, which is beneficial for improving the balance of the force distribution of the different spring members in the circumferential direction of the insertion portion, thereby preventing the occurrence of relative deflection between the front end seat 110 and the active bending section 200.

In this embodiment, the elastic member may be a separate member such as a spring.

As shown in fig. 3 to 8, in some embodiments of the present application, at least one elastic member includes a first elastic member 300a disposed on a first radial line l of the insertion portion, and/or at least one elastic member includes a plurality of second elastic members 300b disposed at both sides of the first radial line l of the insertion portion, the plurality of second elastic members 300b being symmetrically distributed with respect to the first radial line l; the first radial line l passes through the axis of the insertion portion and the axis of the instrument tube 400.

It can be appreciated that in the embodiment in which the plurality of second elastic members 300b are symmetrically distributed with respect to the first radial line l, the second elastic members 300b can uniformly share the pre-tightening and pressing action between the front end seat 110 and the active bending section 200 on both sides of the first radial line l, which is beneficial to optimizing the stress distribution balance of the insertion portion in the circumferential direction, so as to prevent the front end seat 110 and the active bending section 200 from being relatively deflected.

Referring to fig. 1 to 10, an embodiment of the present application further provides an endoscope, which includes a handle and an insertion portion according to any one of the foregoing embodiments, so that the endoscope has the beneficial effects of the insertion portion, which are not described herein.

Wherein, the handle is connected with the insertion portion, in a specific installation process, through pulling the instrument tube 400, a traction force F can be applied to the front end seat 110 to pull the front end seat 110 and pre-tighten the distal end of the active bending section 200, meanwhile, the instrument tube 400 is arranged in the insertion portion in an extending manner, and the proximal end thereof extends into the handle, in the embodiment of the application, the proximal end of the instrument tube 400 can be pre-tightened in the handle to make the instrument tube 400 in a relatively tightened state, thereby ensuring that the front end seat 110 always bears the traction force F and pre-tightens the distal end of the active bending section 200.

Of course, it should be noted that the endoscope instrument tube 400 is made of a flexible material that is capable of accommodating bending movements of the insertion portion even if a traction force F is applied to the front end seat 110 in the embodiment of the present application.

Under the condition that the front end seat 110 is in pre-tightening abutting connection with the active bending section 200, the elastic element can play a role in elastic support between the front end seat 110 and the active bending section 200 and positioned on the offset side of the instrument tube 400, so that relative deflection of the front end seat 110 and the active bending section 200 is effectively avoided, and the assembly reliability between the front end seat and the active bending section is improved.

The endoscope in the embodiment of the application may be a bronchoscope, a pyeloscope, a esophagoscope, a gastroscope, a enteroscope, an otoscope, a nasoscope, a stomatoscope, a laryngoscope, a colposcope, a laparoscope, an arthroscope, and the like, and the type of the endoscope is not particularly limited in the embodiment of the application.

In the embodiments described above, the differences between the embodiments are mainly described, and as long as there is no contradiction between the different optimization features between the embodiments, the different optimization features may be combined to form a better embodiment, and in consideration of brevity of line text, the description is omitted here.

The foregoing is merely exemplary of the present application and is not intended to limit the present application. Various modifications and changes may be made to the present application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc. which are within the spirit and principles of the present application are intended to be included within the scope of the claims of the present application.

Claims (10)

1. An insertion section for an endoscope, characterized in that the insertion section comprises a front end seat, an instrument tube and an active bending section, the distal end of the instrument tube is fixedly mounted on the front end seat, the instrument tube can apply traction force to the front end seat, and the front end seat is preloaded against the distal end of the active bending section by traction of the instrument tube;

the insertion part further comprises at least one elastic piece, the elastic piece is arranged on the first abutting surface of the front end seat and/or the second abutting surface of the active bending section, and the elastic piece is positioned on the offset side of the instrument tube in the circumferential direction of the insertion part.

2. The insert according to claim 1, wherein the elastic member is integrally formed on the front end seat or the active bending section, and a deformation gap is formed between the elastic member and the front end seat or the active bending section.

3. The insert of claim 2, wherein the resilient member defines a notch, the notch being in communication with the deformation gap.

4. An insert according to claim 3, wherein the notch and the deformation gap define two oppositely disposed arms of the resilient member;

the at least one elastic piece comprises a first elastic piece arranged on a first radial line of the insertion part, two support arms of the first elastic piece are symmetrically arranged relative to the first radial line, and/or the at least one elastic piece comprises a plurality of second elastic pieces arranged on two sides of the first radial line of the insertion part, and in the same second elastic piece, the support arm close to the first radial line is higher than the support arm far away from the first radial line; the first radial line passes through an axis of the insertion portion and an axis of the instrument tube.

5. An insert according to claim 2, wherein the number of elastic members is plural, and the number or cross-sectional area of the deformation slits in the elastic members gradually decreases in a circumferential direction of the insert and in a direction away from the first radial line of the insert.

6. An insert according to claim 2, wherein the deformation gap is at least partially provided under the respective abutment surface of the front end seat or the active curved section in the axial direction of the insert.

7. The insert according to any one of claims 1 to 6, wherein the proximal end of the front end socket is provided with a first step, the distal end of the active bending section is provided with a second step, and the step surface of the first step and/or the step surface of the second step is provided with the resilient member.

8. The insertion portion according to any one of claims 1 to 6, wherein the elastic member is plural, a height of the elastic member is gradually reduced, and/or a rigidity of the elastic member is gradually increased in a direction of a circumferential direction of the insertion portion and away from a first radial line of the insertion portion; the first radial line passes through an axis of the insertion portion and an axis of the instrument tube.

9. The insert according to any one of claims 1 to 6, wherein the at least one elastic member comprises a first elastic member provided on a first radial line of the insert, and/or wherein the at least one elastic member comprises a plurality of second elastic members provided on both sides of the first radial line of the insert, the plurality of second elastic members being symmetrically distributed with respect to the first radial line; the first radial line passes through an axis of the insertion portion and an axis of the instrument tube.

10. An endoscope comprising a handle and the insertion portion of any one of claims 1 to 9, the handle being connected to the insertion portion.

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