Active bending section, insertion part and endoscope

Abstract

The utility model provides an active bending section, an insertion part and an endoscope, and belongs to the technical field of endoscopes. The driving bending section is provided with two steering notch sets arranged in the first radial direction of the driving bending section and two guiding structure sets arranged in the second radial direction of the driving bending section. The steering notch set comprises a plurality of steering notches distributed in the axial direction of the active bending section, and the steering notches penetrate through the pipe wall of the active bending section. The guide structure group comprises a plurality of guide structures which are arranged in the axial direction of the active bending section, and each guide structure is formed by deforming a part of the pipe wall of the active bending section towards one side of the inner surface of the active bending section and is provided with a traction channel through which a traction rope of the endoscope penetrates; the first radial direction and the second radial direction are not parallel, the guide structure is connected with a stop part, and the stop part is used for supporting the traction rope arranged in the guide structure in a penetrating mode so as to prevent the traction rope from deviating towards the first radial direction. In the application, the backstop part is arranged to prevent the traction rope from deviating towards the first radial direction, so that the traction rope is prevented from influencing the bending of the active bending section.

Description

Technical Field

[0001] The utility model belongs to the technical field of endoscopes, and in particular relates to an active bending section, an insertion part and an endoscope. Background Art

[0002] As a medical diagnostic instrument, an endoscope can enter the body and take images of the lesion through a camera packaged at the far end, providing doctors with sufficient diagnostic information to treat the disease. The endoscope includes an insertion part, which can enter the body through a human cavity or a surgical incision.

[0003] The insertion portion includes an active bending section, and the traction rope of the active bending section is generally set on the bending side of the active bending section to better control the bending of the active bending section. In some active bending sections, in order to make the pipeline instruments inside the active bending section more reasonably arranged, the traction rope will be set offset relative to the rotation side of the active bending section. However, under this structure, in the process of using the traction rope to control the bending of the active bending section, the traction rope is easy to deviate toward the rotation side of the active bending section, thereby affecting the traction rope's control of the bending of the active bending section and affecting the doctor's intraoperative operation. Utility Model Content

[0004] The purpose of the present application is to provide an active bending section, 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:

[0006] In the first aspect, the present application provides an active bending segment, which has two groups of steering incision groups arranged along its first radial direction and two groups of guide structure groups arranged along its second radial direction; the steering incision group includes a plurality of steering incisions arranged along the axial direction of the active bending segment, and the steering incisions penetrate the tube wall of the active bending segment; the guide structure group includes a plurality of guide structures arranged along the axial direction of the active bending segment, and the guide structure is formed by deformation of part of the tube wall of the active bending segment toward one side of its inner surface, and the guide structure has a traction channel for a traction rope for passing an endoscope; the first radial direction and the second radial direction are not parallel, and the guide structure is connected to a stop portion, which is used to support the traction rope passing through the guide structure to prevent the traction rope from deviating toward the first radial direction.

[0007] In a second aspect, the present application provides an insertion portion, comprising the active bending segment provided in the first aspect.

[0008] In a third aspect, the present application provides an endoscope, comprising the insertion portion provided in the second aspect.

[0009] The technical solution provided by this application can achieve the following beneficial effects:

[0010] In the present application, the active bending section has two groups of steering incision groups arranged along its first radial direction and two groups of guide structure groups arranged along its second radial direction. By setting the first radial direction and the second radial direction to be non-parallel, the layout position of the guide structure is changed, so that the instruments inside the active bending section can be arranged more reasonably; and the guide structure has a stopper. When the traction rope drives the active bending section to bend, even if the traction rope has a tendency to deviate toward the first radial direction due to the non-parallelism of the first radial direction and the second radial direction, the stopper can prevent the traction rope from deviating toward the first radial direction, thereby avoiding the movement of the traction rope position affecting the operator's control over the active bending section and avoiding affecting the control accuracy of the active bending section; the stopper can also support the traction rope to avoid the traction rope being stuck between the guide structure and the tube wall of the active bending section, thereby ensuring that the traction rope can move smoothly under the drive of the operator and respond to the operator's control in a timely manner. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments of the utility model or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0012] Figure 1 The overall structure of the active bending section provided in some embodiments of the present application is shown in FIG. Figure 1 ;

[0013] Figure 2 This application is about Figure 1 Detailed view of point A;

[0014] Figure 3 The left view of the active bending segment provided in some embodiments of the present application Figure 1 ;

[0015] Figure 4 The left view of the active bending segment provided in some embodiments of the present application Figure 2 ;

[0016] Figure 5 The overall structure of the active bending section provided in some embodiments of the present application is shown in FIG. Figure 2 ;

[0017] Figure 6 This application is about Figure 5 Detail of point B;

[0018] Figure 7 It is a schematic diagram of the coordination between the active bending section and the traction rope provided in some embodiments of the present application.

[0019] In the figure: 100-active bending section, 110-steering incision, 120-guiding structure, 121-stop portion, 121a-stop surface, 130-first pipe section, 131-tube segment unit, 132-clamping structure, 132a-clamping protrusion, 132b-clamping groove, 140-second pipe section, 141-snake bone unit, 142-riveted structure, 200-traction rope. DETAILED DESCRIPTION

[0020] The following description provides many different embodiments or examples for implementing different features of the present invention. The components and arrangements described in the following specific examples are only used to simplify the present invention and are only used as examples, not to limit the present invention.

[0021] It should be noted that, 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".

[0022] An embodiment of the present application provides an active bending segment 100, and the active bending segment 100 has two groups of steering incision groups arranged along its first radial direction. The steering incision group includes a plurality of steering incisions 110 arranged along the axial direction of the active bending segment 100, and the steering incisions 110 penetrate the tube wall of the active bending segment 100. The active bending segment 100 can bend toward the side where one of the steering incision groups is located, and the steering incisions 110 in the steering incision group are compressed, while the steering incisions 110 in the steering incision group on the opposite side are stretched to adapt to the morphological changes of the active bending segment 100 after bending. Since the active bending segment 100 can be rotated and bent toward the side where the steering incision 110 is located, the side where the steering incision 110 is located can be called the rotation side. The first radial direction is one of the radial directions of the active bending segment 100, and specific reference can be made to Figure 3 , Figure 4 as well as Figure 7 The direction is shown by the dotted line cc.

[0023] The active bending segment 100 also has two groups of guide structure groups arranged along its second radial direction. Any guide structure group includes a plurality of guide structures 120 arranged along the axial direction of the active bending segment 100. The guide structure 120 is formed by deformation of part of the tube wall of the active segment toward one side of its inner surface. The guide structure 120 is located inside the active bending segment 100 and has a traction channel for a traction rope 200 for passing an endoscope. In the embodiment provided in the present application, the active bending segment 100 is connected to two traction ropes 200, and the two traction ropes 200 correspond one-to-one to the two groups of guide structure groups. The traction ropes 200 pass through the traction channels of the guide structures 120 located on the same side in turn, and the guide structure 120 is used to limit the traction ropes 200. The second radial direction is one of the radial directions of the active bending segment 100, and specific reference may be made to Figure 3 , Figure 4 as well as Figure 7 The direction is shown by the dotted line dd.

[0024] Set the first radial direction and the second radial direction to be non-parallel, refer to the figure Figure 3 , Figure 4 as well as Figure 7 As shown, under such a layout, the first radial direction and the second radial direction are prevented from being in the same plane, so that the guide structure 120 is offset, so as to facilitate the re-planning and layout of the space inside the active bending section 100. In addition, the guide structure 120 is also connected to a stopper 121, which can support the traction rope 200 passing through the guide structure 120, thereby limiting the range of movement of the traction rope 200 on the cross section of the active bending section 100, and preventing the traction rope 200 from deviating toward the first radial direction, resulting in the traction rope 200 being stuck between the guide structure 120 and the tube wall of the active bending section 100.

[0025] The diameter direction of the active bending section 100 perpendicular to the first radial direction is set as the third radial direction. The third radial direction is one of the radial directions of the active bending section 100. For details, please refer to Figure 3 , Figure 4 as well as Figure 7 Since the steering cutouts 110 are arranged on the tube walls on both sides of the active bending section 100 in the first radial direction, the pivot center of the active bending section 100 is located at the part of the tube wall of the active bending section 100 in the third radial direction. The position of the pivot center is related to the setting position of the steering cutouts 110 and has no necessary relationship with the setting position of the guide structure 120.

[0026] Since the first radial direction and the second radial direction are not parallel, the guide structure 120 is not at the midpoint of the steering cut 110. When the traction rope 200 is pulled to control the bending of the active bending section 100, the steering cut 110 will not be compressed into place. The steering cut 110 also has a certain compression margin. Since the position of the pivot center of the active bending section 100 will not change, when the traction rope 200 is continuously pulled, the traction rope 200 will shift toward the first radial direction, and has a tendency to shift to the midpoint of the steering cut 110, so that the steering cut 110 can continue to be compressed.

[0027] Since the guide structure 120 is formed by the deformation of part of the tube wall of the active bending section 100, the closer to the edge of the guide structure 120, the smaller the size of the traction channel of the guide structure 120. If the traction rope 200 deviates toward the turning midpoint, the traction rope 200 is likely to be pressed against the inner wall of the guide structure 120 and the tube wall of the active bending section 100 at the same time, causing the traction rope 200 to be squeezed between the guide structure 120 and the tube wall of the active bending section 100, making it difficult to pull the traction rope 200, and causing friction between the guide structure 120 and the active bending section 100, resulting in structural damage to the traction rope 200. In addition, since the position of the traction rope 200 moves, the bending accuracy of the active bending section 100 will also be affected.

[0028] Therefore, in the embodiment of the present application, the guide structure 120 is connected with a stopper 121, and the stopper 121 has two functions: one is to limit the traction rope 200 passing through the guide structure 120, and the other is to support the traction rope 200 passing through the guide structure 120. Specifically, the stopper 121 is generally arranged on the side of the guide structure 120 close to the first radial direction. In the case that the traction rope 200 has a tendency to deviate, the guide structure 120 can prevent the traction rope 200 from deviating, thereby avoiding the change of the position of the traction rope 200 in the radial direction of the active bending section 100, avoiding the movement of the position of the traction rope 200 affecting the operator's control of the active bending section 100, and avoiding affecting the control accuracy of the active bending section 100. The stopper 121 can also support the traction rope 200 while limiting the position of the traction rope 200, thereby preventing the traction rope 200 from being stuck between the guide structure 120 and the tube wall of the active bending section 100 and being supported by the guide structure 120 and the tube wall of the active bending section 100, reducing the friction force on the traction rope 200 during movement, thereby increasing the driving force applied to the traction rope 200 by the operator, and the traction rope 200 can respond to the operator's operation in a timely manner.

[0029] In some preferred embodiments, the surface of the stopper 121 used to support the traction rope 200 is a stopper surface 121a, Figure 1 and Figure 2As shown, the stop surface 121a is a curved surface structure. When the stop surface 121a contacts the traction rope 200, the contact area between the two can be increased, the support effect of the stop surface 121a on the traction rope 200 can be increased, and the force per unit area of ​​the traction rope 200 can be reduced, thereby reducing the possibility of stress concentration in the traction rope 200. The stop surface 121a and the inner surface of the guide structure 120 for contacting the traction rope 200 have a smooth transition, and the connection position between the two is a smooth curved surface structure without corners or protrusions. The position of the traction rope 200 in the guide structure 120 is not fixed, and it can contact any inner surface of the guide structure 120. Therefore, the inner surface of the guide structure 120 and the stop surface 121a are set to smoothly transition to avoid the traction rope 200 being worn at the junction of the two when the traction rope 200 moves in the guide structure 120.

[0030] In some preferred embodiments, along the axial direction of the active bending section 100, the inner surface of the guide structure 120 for contacting the traction rope 200 and the projection of the stop surface 121a are arc structures, Figure 3 and Figure 4 As shown. On the one hand, the projection is an arc structure, the contact area between the traction rope 200 and the guide structure 120 can be increased, and the guide structure 120 has a better support effect on the traction rope 200. On the other hand, the projection is an arc structure, which means that the connection between the stop surface 121a and the inner surface of the guide structure 120 for contacting the traction rope 200 is also an arc structure. Even if the traction rope 200 moves to the connection position, the connection position can contact the outer peripheral wall of the traction rope 200 to support the traction rope 200, thereby avoiding the situation where the traction rope 200 cannot contact the connection position, causing the traction rope 200 to be stuck between the stop surface 121a and the guide structure 120.

[0031] In order to save the internal space of the active bending section 100, the traction channel of the guide structure 120 for passing the traction rope 200 is generally not too large, and the movable margin of the traction rope 200 in the traction channel is small. The corresponding central angle of the arc structure is set to be greater than or equal to 180 degrees. When the traction rope 200 is pulled and the traction rope 200 is offset toward the first radial direction, the reference Figure 7 As shown, the traction rope 200 can be constrained to the area corresponding to the arc surface of the guide structure 120, so as to prevent the radial position movement of the traction rope 200 from affecting the control accuracy of the active bending section 100, and the restraint and support effect of the traction rope 200 is better.

[0032] The stopper 121 has a variety of configurations. In some embodiments, refer to Figure 3As shown, one end of the stopper 121 is fixed to the guide structure 120, and the other end extends to the tube wall of the active bending section 100, and is fixedly arranged with the active bending section 100. The stopper 121 extends to the tube wall of the active bending section 100, isolating the traction channel of the guide structure 120 into two parts, so as to improve the limiting effect of the stopper 121 on the traction rope 200, and avoid the traction rope 200 being squeezed and sliding toward the first radial direction around the stopper 121. Further preferably, the stopper surface 121a of the stopper 121 smoothly transitions with the inner surface of the active bending section 100. The connection position of the stopper 121 and the active bending section 100 is a smooth curved surface structure, without corners or protrusions. Even when the traction rope 200 is pulled, the traction rope 200 deviates to the connection position between the two, and the traction rope 200 is not easy to wear. The curved surface structure may also be set as an arc curved surface, which can better fit with the outer peripheral wall of the traction rope 200 and improve the supporting and limiting effect on the traction rope 200.

[0033] In other embodiments, the stopper 121 may be formed by bending a portion of the guide structure 120, so that the available space in the active bending section 100 is increased. Figure 4 As shown, along the circumference of the active bending section 100, the portion of the guide structure 120 close to the first radial direction is extended in a direction away from the first radial direction to form a stopper 121. Since the guide structure 120 is formed by deformation of a portion of the tube wall of the active bending section 100, the closer it is to the first radial direction, the smaller the size of the traction channel of the guide structure 120, and the angle between the inner surface of the guide structure 120 and the active bending section 100 is an acute angle, which makes it easy for the traction rope 200 to be stuck between the guide structure 120 and the active bending section 100. In some embodiments provided by the present application, part of the guide structure 120 is extended in a direction away from the first radial direction, so that the angle between the inner surface of the guide structure 120 and the inner wall surface of the active bending section 100 is an obtuse angle, so that the bent guide structure 120 has a limiting effect on the traction rope 200, and the traction rope 200 is not easy to be stuck between the guide structure 120 and the active bending section 100.

[0034] The active bending section 100 may be a snake-bone riveted structure 142, or an integrally formed cut snake-bone, or a combination of two snake-bone structures. In some embodiments of the present application, the active bending section 100 includes a first tube section 130, the first tube section 130 is a cut snake-bone, the first tube section 130 has a plurality of turning cuts 110, and a tube section unit 131 located between the turning cuts 110, Figure 1 , Figure 2 , Figure 5 as well as Figure 6As shown, some of the pipe segment units 131 are provided with a guide structure 120 , and a traction rope 200 is provided to pass through the guide structure 120 , and the traction rope 200 is used to control the bending of the first pipe segment 130 .

[0035] In order to improve the coaxiality of the first pipe section 130, a clamping structure 132 is provided between two adjacent pipe section units 131. The clamping structure 132 includes a clamping groove 132b and a clamping protrusion 132a. The clamping protrusion 132a is located in one of the two adjacent pipe section units 131, and the clamping groove 132b is located in the other of the two adjacent pipe section units 131. The clamping protrusion 132a can be clamped into the clamping groove 132b. When the traction rope 200 is pulled to control the bending of the first pipe section 130, the steering cutout 110 between the two adjacent pipe section units 131 is compressed, so that the clamping protrusion 132a can be clamped into the clamping groove 132b. The groove wall of the clamping groove 132b is used to limit the clamping protrusion 132a, so as to prevent the two adjacent pipe section units 131 from twisting.

[0036] There is no restriction on the specific position of the clamping structure 132 between two adjacent pipe segment units 131, but it should be noted that along the circumference of the first pipe segment 130, the guide structure 120 needs to be staggered with the clamping structure 132, so that the grooves of the guide structure 120 and the clamping structure 132 are not in the same straight line. The guide structure 120 and the clamping groove 132b will both reduce the structural strength of the pipe segment unit 131. When the two are staggered, when the traction rope 200 is pulled to drive the first pipe segment 130 to bend and the pipe segment unit 131 is squeezed by the adjacent pipe segment unit 131, the force of the part of the pipe segment unit 131 with the clamping groove 132b is not in the same straight line as the force of the part of the pipe segment unit 131 with the guide structure 120, so that the pipe segment unit 131 is not prone to stress concentration, and the pipe segment unit 131 is not easily damaged, and its structure can remain intact, and the bending accuracy of the first pipe segment 130 will not be affected.

[0037] In order to ensure the overall structural strength of the first pipe section 130 during use, only some of the pipe segment units 131 are provided with guide structures 120, and the number of pipe segment units 131 between two adjacent guide structures 120 is generally greater than or equal to two, so as to avoid the guide structure 120 excessively affecting the structural strength of the first pipe section 130.

[0038] In other embodiments of the present application, the active bending section 100 includes a second tube section 140, the second tube section 140 is a riveted snake bone structure, the second tube section 140 includes a plurality of snake bone units 141 arranged along its axial direction, a turning cut 110 is formed between two adjacent snake bone units 141, and two riveted structures 142 arranged along the radial direction of the second tube section 140 are connected between the two adjacent snake bone units 141, refer to Figure 7As shown, two riveted structures 142 are arranged along the third radial direction, and are arranged perpendicularly to the arrangement direction of the two groups of steering cutouts. The riveted structures 142 serve as the pivot center, and the adjacent snake bone units 141 are rotated through the riveted structures 142. The snake bone unit 141 also has a guide structure 120 for the traction rope 200 to pass through. Compared with the integrated cutting snake bone, the riveted snake bone has a higher bending accuracy. At the same time, the riveted structure 142 will occupy part of the space in the active bending section 100. The offset setting of the guide structure 120 is more conducive to the layout of the space of the active bending section 100.

[0039] In some embodiments of the present application, the active bending section 100 may include a first tube section 130 and a second tube section 140 at the same time, and the second tube section 140 is located at the distal end of the first tube section 130. Figure 5 and Figure 6 The schematic diagram of the active bending section 100 and the traction rope 200 can be referred to Figure 7 As shown, the traction rope 200 passes through the two guide structures 120 in the second radial direction of the active bending section 100, and the instrument channel, image fiber, light guide fiber, etc. in the active bending section 100 are compactly arranged. When the traction rope 200 is pulled, the traction rope 200 has a tendency to deviate toward the first radial direction, that is, the side where the dotted line cc is located. The traction rope 200 is stopped by the stop portion 121 to prevent the traction rope 200 from being stuck.

[0040] The embodiment of the present application further provides an insertion portion, comprising the active bending segment 100 provided in any of the above embodiments.

[0041] The embodiment of the present application also provides an endoscope, including the insertion portion provided in the above embodiment. The endoscope in the embodiment of the present application can be a bronchoscope, a pyeloscope, an esophagoscope, a gastroscope, an enteroscope, an otoscope, a rhinoscope, a stomatoscope, a laryngoscope, a colposcope, a laparoscope, an arthroscope, etc. The embodiment of the present application does not specifically limit the type of the endoscope.

[0042] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An active bending section, characterized in that: The active bending section (100) has two groups of steering cutouts arranged along a first radial direction thereof and two groups of guide structure groups arranged along a second radial direction thereof; The steering cutout group comprises a plurality of steering cutouts (110) arranged along the axial direction of the active bending section (100), and the steering cutouts (110) penetrate the tube wall of the active bending section (100); The guide structure group comprises a plurality of guide structures (120) arranged along the axial direction of the active bending section (100), the guide structure (120) being formed by deformation of a portion of the tube wall of the active bending section (100) toward one side of the inner surface thereof, and the guide structure (120) having a traction channel for passing a traction rope (200) of an endoscope; The first radial direction and the second radial direction are not parallel, and the guide structure (120) is connected to a stopper (121), the stopper (121) being used to support a traction rope (200) passing through the guide structure (120) to prevent the traction rope (200) from deviating towards the first radial direction.

2. An active bending section according to claim 1, characterized in that: The surface of the stop portion (121) used to support the traction rope (200) is a stop surface (121a), the stop surface (121a) is a curved surface structure, and the stop surface (121a) smoothly transitions with the inner surface of the guide structure (120) used to contact the traction rope (200).

3. An active bending section according to claim 2, characterized in that: Along the axial direction of the active bending section (100), the inner surface of the guide structure (120) for contacting the traction rope (200) and the projection of the stop surface (121a) are arc structures, and the central angle corresponding to the arc structure is greater than or equal to 180 degrees.

4. The active bending section according to claim 1, characterized in that: One end of the stopper (121) is fixed to the guide structure (120), and the other end extends to the tube wall of the active bending section (100) and is fixed to the active bending section (100).

5. An active bending section according to claim 4, characterized in that: The surface of the stop portion (121) used to support the traction rope (200) is a stop surface (121a), and the stop surface (121a) smoothly transitions to the inner surface of the active bending section (100).

6. An active bending section according to any one of claims 1 to 5, characterized in that: Along the circumference of the active bending section (100), a portion of the guide structure (120) close to the first radial direction is extended in a direction away from the first radial direction to form the stop portion (121).

7. An active bending section according to any one of claims 1 to 5, characterized in that: The active bending section (100) comprises a first pipe section (130), the first pipe section (130) comprising a plurality of the steering cutouts (110) and pipe segment units (131) located between the steering cutouts (110), some of the pipe segment units (131) being provided with the guide structure (120), a clamping structure (132) being provided between two adjacent pipe segment units (131), the clamping structure (132) comprising a clamping protrusion (132a) located on one of the pipe segment units (131) and a clamping groove (132b) located on another pipe segment unit (131), wherein along the circumference of the first pipe section (130), the guide structure (120) and the clamping structure (132) are arranged in a staggered manner.

8. An active bending section according to claim 7, characterized in that: In the same guide structure group, the number of pipe segment units (131) between two adjacent guide structures (120) is greater than or equal to two.

9. An insertion portion, characterized in that: Comprising the active bending segment (100) according to any one of claims 1 to 8.

10. An endoscope, characterized in that: Comprising the insertion portion according to claim 9.

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