Endoscope

Abstract

To provide an endoscope that can be used as a disposable tool.SOLUTION: An endoscope includes an insertion pipe device and a control device. The insertion pipe device includes an elastic support unit, a lens unit, and a tubular sleeve unit. The elastic support unit includes a distal disk, a proximal disk, an intermediate disk, and a first and second springs connected between the disks. The lens unit includes a lens seat and a lens module. The tubular sleeve unit is covered on the lens seat and the elastic support unit. The control device includes a grip and an angle control module connected to the insertion pipe device. The angle control module can be operated to move the distal disk and bend the first spring, thus controlling the angle of the distal disk.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present disclosure relates to medical instruments, and more particularly to endoscopes. [Background technology]

[0002] Endoscopes are used to perform various medical examinations, such as intestinal examination, bronchial examination, abdominal examination, and thoracic examination. Conventional endoscopes include a fiberscope or videoscope that is inserted into a cavity of a patient (including humans and animals) to capture images of the patient's organs or other tissues. Some endoscopes have very complicated structures to obtain clear images or to perform some surgical procedures, which results in high manufacturing costs for the endoscope. To reduce costs, it is common to reuse endoscopes after sterilization.

[0003] However, when using endoscopes on patients with highly contagious diseases such as acquired immune deficiency syndrome (AIDS) or coronavirus disease 2019 (COVID-19), the sterilization procedures for endoscopes must be performed thoroughly for higher safety standards, which is time-consuming and costly, while the use of disposable endoscopes raises concerns about costs. Summary of the Invention [Problem to be solved by the invention]

[0004] It is therefore an object of the present disclosure to provide an endoscope that can alleviate at least one of the disadvantages associated with the prior art discussed above. [Means for solving the problem]

[0005] According to the present disclosure, an endoscope includes an insertion tube device and a control device. The insertion tube device includes a resilient support unit, a lens unit, and a tubular sleeve unit. The resilient support unit includes a distal disk, a proximal disk, an intermediate disk disposed between the distal disk and the proximal disk, a first spring that is bendable and connected between the distal disk and the intermediate disk, and a second spring that is bendable and connected between the intermediate disk and the proximal disk. The distal disk, the first spring, the intermediate disk, the second spring, and the proximal disk are coaxially disposed with each other when the first spring and the second spring are not bent. The distal disk has a front surface and a rear surface. The rear surface of the distal disk faces the first spring. The lens unit includes a lens seat attached to the front surface of the distal disk, and a first lens module attached to the lens seat for capturing an image. The tubular sleeve unit is placed over the lens seat and the resilient support unit. The control device includes a grip connected to the proximal disk of the elastic support unit, an angle control module installed on the grip and connected to the insertion tube device, and a signal line module attached to the grip and electrically connected to the first lens module for signal transmission and power transmission. The angle control module is operable to move the distal disk relative to the middle disk and bend the first spring, thereby controlling the angle of the distal disk relative to the middle disk.

[0006] Other features and advantages of the present disclosure will become apparent in the following detailed description of the embodiments, which proceeds with reference to the accompanying drawings. [Brief description of the drawings]

[0007] [Figure 1] 1 is a partial side view showing one embodiment of an endoscope according to the present disclosure. [Diagram 2] FIG. 2 is a partial perspective view showing the insertion tube device of the embodiment. [Diagram 3] FIG. 2 is a partial cross-sectional side view showing the insertion tube device of the embodiment. [Figure 4]FIG. 2 is a partial perspective view showing the insertion tube device of the embodiment with the tubular sleeve unit omitted. [Diagram 5] FIG. 4 is a partially enlarged view of FIG. [Figure 6] FIG. 2 is a partially exploded perspective view showing the embodiment. [Figure 7] FIG. 2 is a partial cross-sectional side view showing the insertion tube device of the embodiment. [Figure 8] FIG. 8 is a partial enlarged view of FIG. [Figure 9] FIG. 2 is a partial side view showing an angle control module of the control device of the embodiment. [Figure 10] 8 is a view similar to FIG. 7, but showing the insertion tube device of the embodiment being driven and bent by the angle control module. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] Referring to FIG. 1, an embodiment of an endoscope 100 according to the present disclosure includes a flexible insertion tube apparatus 2 for insertion into a patient's lumen, and a control device 8 connected to an end of the insertion tube apparatus 2.

[0009] 2, 3 and 4, the insertion tube device 2 includes an elastic support unit 3, a lens unit 4, a nozzle unit 5, a suction unit 6 and a tubular sleeve unit .

[0010] The elastic support member 3 includes a distal disc 31, a proximal disc 33, an intermediate disc 32 disposed between the distal disc 31 and the proximal disc 33, a first spring 34 that is bendable and connected between the distal disc 31 and the intermediate disc 32, and a second spring 35 that is bendable and connected between the intermediate disc 32 and the proximal disc 33. The distal disc 31, the first spring 34, the intermediate disc 32, the second spring 35, and the proximal disc 33 are coaxially arranged with each other when the first spring 34 and the second spring 35 are not bent. With further reference to FIG. 5, the distal disc 31 has a front surface 311 and a rear surface 312. The rear surface 312 of the distal disc 31 faces the first spring 34.

[0011] Each of the distal disc 31, the intermediate disc 32 and the proximal disc 33 has an outer peripheral surface with a circular groove 301 formed therein extending around the circumference of the outer peripheral surface. With further reference to FIG. 6, the distal disc 31 has two conduit passage holes 302 extending parallel to the central axis of the distal disc 31 and disposed on either side of the first spring 34, respectively. The intermediate disc 32 has two conduit passage holes 302 extending parallel to the central axis of the intermediate disc 32 and disposed on either side of the first spring 34 and the second spring 35, respectively. The intermediate disc 32 further has two wire passage holes 303 extending parallel to the central axis of the intermediate disc 32 and disposed on either side of the first spring 34 and the second spring 35, respectively. The proximal disc 33 has two conduit passage holes 302 extending parallel to the central axis of the proximal disc 33 and disposed on either side of the second spring 35, respectively. The proximal disc 33 further has two wire passage holes 303 extending parallel to the central axis of the proximal disc 33 and disposed on either side of the second spring 35, respectively.

[0012] In this embodiment, the first spring 34 and the second spring 35 are coil springs that bendably support the distal disc 31 and the intermediate disc 32. The first spring 34 has a larger elastic modulus than the second spring 35, so the first spring 34 can bend more easily than the second spring 35.

[0013] 2, 3, and 5, the lens unit 4 includes a lens seat 41, a first lens module 42, and a second lens module 43. The lens seat 41 is attached to the front surface 311 of the distal disc 31, and has a front surface 411, a rear surface 412 opposite to the front surface 411 and in contact with the front surface 311 of the distal disc 31, and a side surface 413 interconnecting the front surface 411 and the rear surface 412. The first lens module 42 is attached to the front surface 411 of the lens seat 41. The second lens module 43 is embedded in the lens seat 41 via the side surface 413 of the lens seat 41.

[0014] Specifically, the first lens module 42 includes a front lens 421 for capturing a front image, a plurality of front illumination members 422 arranged around the front lens 421 for illuminating an area in front of the front lens 421, and a transparent cover member 423 attached to the lens seat 41 and covering the front lens 421 and the front illumination members 422. The second lens module 43 includes a side lens 431 for capturing a side image, and a side illumination member 432 arranged around the side lens 431 for illuminating an area around the side lens 431.

[0015] 4, 6, and 7, the nozzle unit 5 includes a nozzle ring 51 that is fitted over the lens seat 41, and a first flexible conduit 52 that is fluidly connected to the nozzle ring 51 and extends through the distal disc 31, the intermediate disc 32, and the proximal disc 33. As shown in FIGS. 4 and 6, the nozzle ring 51 has an annular front surface in which a plurality of jet orifices 510 that are angularly spaced apart from one another are formed. The first flexible conduit 52 extends through one of the conduit passage holes 302 of the distal disc 31, one of the conduit passage holes 302 of the intermediate disc 32, and one of the conduit passage holes 302 of the proximal disc 33, and is connected to the control device 8 to introduce liquid or air provided to the control device 8 into the nozzle ring 51.

[0016] The suction unit 6 includes a suction ring 61 that is placed on the lens seat 41, and a second flexible conduit 62 that is fluidly connected to the suction ring 61 and extends through the distal disc 31, the intermediate disc 32, and the proximal disc 33. As shown in Figures 4 and 6, the suction ring 61 has an annular side surface in which a plurality of suction holes 610 that are angularly spaced apart from one another are formed. The second flexible conduit 62 extends through another of the conduit passing holes 302 of the distal disc 31, another of the conduit passing holes 302 of the intermediate disc 32, and another of the conduit passing holes 302 of the proximal disc 33, and is connected to the control device 8 to introduce negative pressure of the control device 8 to the suction ring 61.

[0017] 2, 4, 5, and 7, the tubular sleeve unit 7 has flexibility and is fitted over the lens seat 41 and the elastic support unit 3. The tubular sleeve unit 7 includes a first silicone tube 71 fitted over the distal disc 31 and the lens seat 41, a second silicone tube 72 connected to the first silicone tube 71 and fitted over the distal disc 31 and the intermediate disc 32, a third silicone tube 73 connected to the second silicone tube 72 and fitted over the intermediate disc 32 and the proximal disc 33, and two silicone gasket rings 74 fitted over the joint portion of the first silicone tube 71 and the second silicone tube 72 and the joint portion of the second silicone tube 72 and the third silicone tube 73 to seal these joint portions.

[0018] Specifically, as shown in Figures 3, 5, and 7, the first silicon tube 71 is disposed to cover the nozzle ring 51 and the suction ring 61, and fits into and occupies half of the circular groove 301 of the distal disk 31. The first silicon tube 71 has a plurality of first through holes 711 each fluidly communicating with the injection port 510 of the nozzle ring 51, a plurality of second through holes 712 each fluidly communicating with the suction port 610 of the suction ring 61, and an opening 713 aligned with the second lens module 43, so that the second lens module 43 can capture an image through the opening 713.

[0019] The second silicone tube 72 has opposite ends that fit into the circular groove 301 of the distal disc 31 and the circular groove 301 of the intermediate disc 32, respectively, and occupy the other half of the circular groove 301 of the distal disc 31 and the other half of the circular groove 301 of the intermediate disc 32, respectively. The second silicone tube 72 further has two helical grooves 720 formed on the inner and outer surfaces of the second silicone tube 72, respectively, to facilitate bending. In other embodiments, the second silicone tube 72 may have only one helical groove 720 formed on one of the inner and outer surfaces of the second silicone tube 72.

[0020] The third silicone tube 73 fits into the circular groove 301 of the intermediate disc 32 and the circular groove 301 of the proximal disc 33, respectively, and has opposite ends which occupy the other half of the circular groove 301 of the intermediate disc 32 and the circular groove 301 of the proximal disc 33, respectively. The third silicone tube 73 further has a spiral groove 730 formed in the inner surface of the third silicone tube 73 to facilitate bending.

[0021] 1, 5 and 9, the control device 8 includes a grip 81 connected to the proximal disk 33 of the elastic support unit 3, a liquid valve 82 and an air valve 83 attached to the grip 81 and fluidly connected to the first flexible conduit 52, a suction valve 84 attached to the grip 81 and fluidly connected to the second flexible conduit 62, an angle control module 85 installed in the grip 81 and connected to the insertion tube device 2, and a signal line module 86 attached to the grip 81.

[0022] The liquid valve 82 is adapted to be coupled to a liquid pump (not shown) and configured to be operable to allow a flow of liquid generated by the liquid pump to be introduced into the first flexible conduit 52. The air valve 83 is adapted to be coupled to an air pump (not shown) and configured to be operable to allow a flow of air generated by the air pump to be introduced into the first flexible conduit 52. The suction valve 84 is adapted to be coupled to a negative pressure source (not shown) and configured to be operable to allow a negative pressure generated by the negative pressure source to be introduced into the second flexible conduit 62.

[0023] The angle control module 85 includes a sprocket member 851 attached to the grip 81, a chain 853 disposed within the grip 81 and engaged with the sprocket member 851, and two tension wires 852. One of the tension wires 852 extends through one of the wire passage holes 303 of the intermediate disk 32 and one of the wire passage holes 303 of the proximal disk 33, and has both ends connected to one end of the chain 853 and the rear surface 312 of the distal disk 31, respectively. The other of the tension wires 852 extends through the other of the wire passage holes 303 of the intermediate disk 32 and the other of the wire passage holes 303 of the proximal disk 33, and has both ends connected to the other end of the chain 853 and the rear surface 312 of the distal disk 31, respectively. The ends of the tension wire 852 connected to the rear surface 312 of the distal disk 31 are disposed on both sides of the first spring 34, respectively.

[0024] The sprocket member 851 is rotatable to release one of the tension wires 852 while pulling the other one of the tension wires 852, thereby moving the distal disc 31 relative to the intermediate disc 32 and bending the first spring 34, thereby controlling the angle of the distal disc 31 relative to the intermediate disc 32.

[0025] The signal line module 86 is electrically connected to the first lens module 42 and the second lens module 43, and is adapted to be signally connected to an external display device (not shown) for transmitting power to the first lens module 42 and the second lens module 43 and transmitting signals from the first lens module 42 and the second lens module 43 to the display device, thereby enabling the display device to display images captured by the first lens module 42 and the second lens module 43.

[0026] 5, 9, and 10, in use, the endoscope 100 of the present disclosure can be used in the same manner as a conventional endoscope. Specifically, by inserting the insertion tube device 2 into a patient's internal cavity, the first lens module 42 can capture a front image along the insertion direction of the insertion tube device 2, and the second lens module 43 can capture a side image along the lateral direction of the insertion tube device 2. Since the third silicon tube 73 has a spiral groove 730 formed therein, when the insertion tube device 2 is inserted, the third silicon tube 73 can be easily bent along the shape of the internal cavity of the patient, such as the esophagus or oral cavity.

[0027] 9 and 10, when the user of the endoscope 100 needs to change the imaging direction of the lens unit 4, the user changes the imaging direction of the lens unit 4 by rotating the sprocket member 851 according to a desired direction so as to control the angle of the distal disc 31 relative to the intermediate disc 32 and the angle of the lens seat 41 relative to the intermediate disc 32. Since the spiral groove 720 is formed in the second silicon tube 72 so as to be easily bent and the elastic coefficient of the first spring 34 is greater than the elastic coefficient of the second spring 35, when the user controls the imaging direction of the lens unit 4, the user can easily operate the sprocket member 851 so as to bend the portion between the distal disc 31 and the intermediate disc 32 of the insertion tube device 2, thereby controlling the angle of the distal disc 31 and the lens seat 41 relative to the intermediate disc 32.

[0028] When a user wishes to wash tissue or the transparent cover member 423 in the patient's cavity, the liquid valve 82 is opened to introduce pressurized liquid into the first flexible conduit 52, and a liquid jet is ejected from the nozzle port 510 of the nozzle ring 51 through the first through hole 711 of the first silicon tube 71 to wash away blood or mucus on the tissue or to clean the transparent cover member 423. The air valve 83 is opened to introduce pressurized air into the first flexible conduit 52, and an air stream is ejected from the nozzle port 510 of the nozzle ring 51 through the first through hole 711 of the first silicon tube 71 to supply air to the cavity. The suction valve 84 is opened to introduce negative pressure into the second flexible conduit 62 to perform drainage of bodily fluids and liquids, and to perform air suction through the suction port 610 of the suction ring 61 and the second through hole 712 of the first silicon tube 71.

[0029] In this embodiment, the lens unit 4 is configured to include the first lens module 42 and the second lens module 43, but in other embodiments, the lens unit 4 may include only one of the first lens module 42 and the second lens module 43. For example, the lens unit 4 may include only the first lens module 42. Even in such a configuration, the user can still control the direction of the first lens module 42 as described above to change the shooting direction as required.

[0030] In this embodiment, the tubular sleeve unit 7 is configured to include three silicone tubes, namely a first silicone tube 71, a second silicone tube 72 and a third silicone tube 73, however, in other embodiments, the tubular sleeve unit 7 may be integrally formed into a single elongated silicone tube.

[0031] The configuration of the endoscope 100 according to the present embodiment allows the manufacturing cost of the endoscope 100 to be significantly reduced. Therefore, when the endoscope 100 is used on a patient suffering from a highly contagious disease, the lower-cost endoscope 100 can be used as a disposable instrument without much consideration of cost. Also, when the endoscope 100 is used on a patient not suffering from a highly contagious disease, the user can selectively discard some components of the endoscope 100 that cannot withstand high-temperature sterilization. For example, after use of the endoscope 100, the elastic support unit 3 can be reused after sterilization, but the tubular sleeve unit 7, the lens unit 4, the nozzle unit 5, and the suction unit 6 are removed and discarded. The partially disposable configuration of the endoscope 100 promotes the reduction of medical costs.

[0032] In summary, the configuration of the elastic support unit 3, the tubular sleeve unit 7, and the lens unit 4 allows the manufacturing cost of the endoscope 100 to be significantly reduced without sacrificing its basic functions. Thus, the endoscope 100 of the present disclosure can be used as a disposable instrument when used on patients with highly contagious diseases, thereby reducing the risk of infection. Meanwhile, the endoscope 100 of the present disclosure can be used as a partially reusable instrument when used on patients without highly contagious diseases, thereby reducing medical costs.

[0033] Although the embodiments and modified examples of the present disclosure have been described above, the present disclosure is not limited to these, and is intended to encompass all modifications and equivalent configurations as various configurations falling within the spirit and scope of the broadest interpretation. [Explanation of symbols]

[0034] 100 Endoscope 2 Insertion tube device 3 Elastic support unit 301 Circular Groove 302 Conduit passage hole 303 Wire passage hole 31 Distal disc 311 Front 312 Rear 32 Intermediate Disk 33 Proximal disc 34 First Spring 35 Second Spring 4 Lens unit 41 Lens seat 411 Front 412 Rear 413 Side 42 First Lens Module 421 Front lens 422 Front lighting component 423 Transparent cover material 43 Second Lens Module 431 Side Lens 432 Side lighting member 5 Nozzle unit 51 Nozzle ring 510 Nozzle 52 First flexible conduit 6 Suction unit 61 Suction Ring 610 Suction port 62 Second flexible conduit 7 Tubular sleeve unit 71 First Silicone Tube 711 First through hole 712 Second Through Hole 713 Aperture 72 Second Silicone Tube 720 Spiral Groove 73 Third Silicone Tube 730 Spiral Groove 74 Silicone Gasket Ring 8 Control device 81 Grip 82 Liquid Valve 83 Air Valve 84 Suction valve 85 Angle Control Module 851 Sprocket parts 852 Pull Wire 853 Chain 86 Signal Line Module

Claims

1. An insertion tube device (2) and a control device (8), The insertion tube device (2) includes an elastic support unit (3), a lens unit (4), and a tubular sleeve unit (7); The elastic support unit (3) includes a distal disc (31), a proximal disc (33), an intermediate disc (32) disposed between the distal disc (31) and the proximal disc (33), a first spring (34) that is bendable and connected between the distal disc (31) and the intermediate disc (32), and a second spring (35) that is bendable and connected between the intermediate disc (32) and the proximal disc (33). wherein the distal disc (31), the first spring (34), the intermediate disc (32), the second spring (35) and the proximal disc (33) are coaxially arranged with each other when the first spring (34) and the second spring (35) are not bent, and the distal disc (31) has a front surface (311) and a rear surface (312), and the rear surface (311) of the distal disc (31) faces the first spring (34); The lens unit (4) includes a lens seat (41) attached to the front surface (311) of the distal disk (31), and a first lens module (42) attached to the lens seat (41) for capturing an image; The tubular sleeve unit (7) is fitted over the lens seat (41) and the elastic support unit (3), the control device (8) includes a grip (81) connected to the proximal disc (33) of the elastic support unit (3); an angle control module (85) installed on the grip (81) and connected to the insertion tube device (2); and a signal line module (86) attached to the grip (81) and electrically connected to the first lens module (42) for signal transmission and power transmission, the angle control module (85) being operable to move the distal disc (31) relative to the intermediate disc (32) and bend the first spring (34), thereby controlling the angle of the distal disc (31) relative to the intermediate disc (32). An endoscope (100).

2. The endoscope (100) of claim 1, wherein the tubular sleeve unit (7) includes a first silicone tube (71) that is fitted over the distal disc (31) and the lens seat (41), a second silicone tube (72) that is connected to the first silicone tube (71) and that is fitted over the distal disc (31) and the intermediate disc (32), and a third silicone tube (73) that is connected to the second silicone tube (72) and that is fitted over the intermediate disc (32) and the proximal disc (33), and the second silicone tube (72) has a spiral groove (720) formed on at least one of its inner and outer surfaces to facilitate bending.

3. 3. The endoscope (100) of claim 2, wherein the third silicone tube (73) has a spiral groove (730) formed on its inner surface to facilitate bending.

4. The endoscope (100) of claim 2 or 3, wherein the tubular sleeve unit (7) further includes two silicone gasket rings (74) respectively covering the joint portion between the first silicone tube (71) and the second silicone tube (72) and the joint portion between the second silicone tube (72) and the third silicone tube (73).

5. The endoscope (100) of claim 1, wherein the first lens module (42) includes a front lens (421) for capturing a front image and a plurality of front illumination members (422) arranged around the front lens (421).

6. The endoscope (100) of claim 5, wherein the first lens module (42) is attached to the lens seat (41) and further includes a transparent cover member (423) that covers the front lens (421) and the front illumination member (422).

7. The lens seat (41) has a front surface (411), a rear surface (412) opposite the front surface and in contact with the distal disc (31), and a side surface (413) interconnecting the front and rear surfaces; The lens unit (4) further includes a second lens module (43) embedded in the lens seat (41) via the side surface (413) of the lens seat (41); the tubular sleeve unit (7) has an opening (713) aligned with the second lens module (43); The endoscope (100) of claim 5, wherein the second lens module (43) includes a side lens (431) for capturing a side image through the opening (713) and a plurality of side illumination members (432) arranged around the side lens (431).

8. The insertion tube device (2) further includes a nozzle unit (5) including a nozzle ring (51) that fits over the lens seat (41) and a first flexible conduit (52) that is fluidly connected to the nozzle ring (51), extends through the distal disc (31), the intermediate disc (32), and the proximal disc (33), and is connected to the control device (8); The nozzle ring (51) has an annular front surface on which a plurality of jets (510) are formed, the jets being angularly spaced apart from one another; the first silicon tube (71) covers the nozzle ring (51) and has a plurality of first through holes (711) each fluidly communicating with the nozzle orifices (510) of the nozzle ring (51); The endoscope (100) of claim 2 or 3, wherein the control device (8) further includes a liquid valve (82) and an air valve (83) attached to the grip (81) and fluidly connected to the first flexible conduit (52).

9. The insertion tube device (2) further includes a suction unit (6) including a suction ring (61) that is placed over the lens seat (41) and a second flexible conduit (62) that is fluidly connected to the suction ring (61), extends through the distal disc (31), the intermediate disc (32), and the proximal disc (33), and is connected to the grip (81); The suction ring (61) has an annular side surface in which a plurality of suction holes (610) are formed, the suction holes being angularly spaced apart from one another; the first silicon tube (71) further covers the suction ring (61) and further has a plurality of second through holes (712) each fluidly connected to the suction port (610) of the suction ring (61); 9. The endoscope (100) of claim 8, wherein the control device (8) further comprises a suction valve (84) attached to the grip (81) and fluidly connected to the second flexible conduit (62).

10. The distal disc (31) has two conduit passage holes (302) extending parallel to the central axis of the distal disc (31) and disposed on either side of the first spring (34), The intermediate disc (32) has two conduit passage holes (302) extending parallel to a central axis of the intermediate disc (32) and arranged on either side of the first spring (34) and the second spring (35), respectively; The proximal disc (33) has two conduit passage holes (302) extending parallel to the central axis of the proximal disc (33) and disposed on either side of the second spring (35), the first flexible conduit (52) of the nozzle unit (5) extends through one of the conduit passage holes (302) of the distal disc (31), one of the conduit passage holes (302) of the intermediate disc (32) and one of the conduit passage holes (302) of the proximal disc (33); The endoscope (100) of claim 9, wherein the second flexible conduit (62) of the suction unit (6) extends through another of the conduit passing holes (302) of the distal disc (31), another of the conduit passing holes (302) of the intermediate disc (32), and another of the conduit passing holes (302) of the proximal disc (33).

11. The intermediate disc (32) has two wire passage holes (303) extending parallel to the central axis of the intermediate disc (32) and arranged on either side of the first spring (34) and the second spring (35), respectively; The proximal disc (33) has two wire passage holes (303) extending parallel to the central axis of the proximal disc (33) and arranged on either side of the second spring (35), The angle control module (85) includes a sprocket member (851) attached to the grip (81), a chain (853) disposed within the grip (81) and engaging with the sprocket member (851), and two tension wires (852); one of the tension wires (852) extends through one of the wire passage holes (303) of the intermediate disc (32) and one of the wire passage holes (303) of the proximal disc (33), and has both ends connected to one end of the chain (853) and the rear surface (312) of the distal disc (31), respectively; another of the tension wires (852) extends through another of the wire passage holes (303) of the intermediate disc (32) and another of the wire passage holes (303) of the proximal disc (33), and has both ends connected to the other end of the chain (853) and the rear surface (312) of the distal disc (31), respectively; An endoscope (100) as described in claim 2 or 3, wherein the sprocket member (851) is rotatable to pull one of the tension wires (852) while releasing the other one of the tension wires, thereby moving the distal disk (31) relative to the intermediate disk (32) and bending the first spring (34).

12. The endoscope (100) of claim 1, wherein the first spring (34) has a modulus of elasticity greater than a modulus of elasticity of the second spring (35).

Images