Insertion part of transnasal endoscope and transnasal endoscope

Abstract

The invention discloses an insertion part of a transnasal endoscope and the transnasal endoscope, and relates to the technical field of medical instruments.The insertion part of the transnasal endoscope comprises a head end part, a bent part and an insertion tube assembly, and the end face of the far end of the head end part is provided with a steam nozzle, an image transmission objective lens window, an illumination window, an auxiliary water supply outlet and an instrument channel outlet; an image transmission board card is arranged in the head end part, an electronic wire harness, a water vapor pipeline, a light guide assembly, an instrument channel pipeline and an auxiliary water supply pipeline are arranged in the bending part and the insertion pipe assembly in a penetrating manner, and the diameters of the electronic wire harness and the instrument channel pipeline are larger than those of the water vapor pipeline, the light guide assembly and the auxiliary water supply pipeline; the distance between the connecting line of the center of the instrument channel pipeline and the center of the electronic wire harness and the center of the head end part, the bending part or the insertion pipe assembly is 0-1 mm, and the steam pipeline and the auxiliary water supply pipeline are located on the two sides of the connecting line of the center of the instrument channel pipeline and the center of the electronic wire harness respectively. The nasal endoscope has the auxiliary water supply function, and water supply is stable.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, in particular to an insertion part of a transnasal endoscope and the transnasal endoscope. BACKGROUND

[0002] The transnasal gastroscope is suitable for old and weak, poor heart and lung function, throat / esophageal stenosis and pediatric patients, and the super-thin scope body (diameter less than 6mm) significantly reduces the pharyngeal reflex and cardiovascular stimulation, has the advantages of high diagnostic rate and low complication rate, and improves the safety of examination and patient tolerance.

[0003] The digestive tract endoscope currently used for diagnosis and treatment usually needs to have an auxiliary water feeding function, an external water feeding device of the endoscope is connected, and then the pumped water is sprayed out from the head end auxiliary water feeding port through the auxiliary water feeding pipeline in the endoscope, to feed water into the patient's body, lumen, cavity or body cavity, for flushing the viscous bubbles, blood, dirt and other substances affecting the field of view in the patient's digestive tract, which can improve the field of view clarity of the gastrointestinal endoscope, reduce the misdiagnosis rate, and facilitate the operator to quickly find the bleeding point during the endoscopic surgery, so as to reduce intraoperative bleeding. Therefore, the auxiliary water feeding function has important significance in clinical practice.

[0004] However, for the transnasal gastroscope, due to the size limitation, the existing products on the market do not have the auxiliary water feeding function. SUMMARY

[0005] The purpose of the present application is to provide an insertion part of a transnasal endoscope and the transnasal endoscope, so as to solve the problems existing in the prior art, so that the transnasal endoscope has the auxiliary water feeding function, and the water feeding is stable.

[0006] To achieve the above-mentioned purpose, the present application provides the following solutions: An intranasal endoscope insertion part, comprising: a head end, a bending part and an insertion tube assembly, which are sequentially connected; a water and gas nozzle, an image transmission objective window, an illumination window, an auxiliary water outlet and an instrument channel outlet are configured on the end face of the distal end of the head end, an image transmission board card is arranged in the head end, an electronic wire harness, a water and gas pipeline, a light guide assembly, an instrument channel pipeline and an auxiliary water pipeline are arranged inside the bending part and the insertion tube assembly, the electronic wire harness extends into the head end and is connected with the image transmission board card, the water and gas pipeline extends into the head end and communicates with the water and gas nozzle, the light guide assembly extends into the head end and is aligned with the illumination window, the instrument channel pipeline extends into the head end and communicates with the instrument channel outlet, the auxiliary water pipeline extends into the head end and communicates with the auxiliary water outlet, the head end, the bending part and the insertion tube are all cylindrical structures, the diameters of the electronic wire harness and the instrument channel pipeline are greater than the diameters of the water and gas pipeline, the light guide assembly and the auxiliary water pipeline, the distance between the center line of the instrument channel pipeline and the electronic wire harness and the center of the head end, the bending part or the insertion tube assembly is 0-1mm, and the water and gas pipeline and the auxiliary water pipeline are respectively located on the two sides of the center line of the instrument channel pipeline and the electronic wire harness.

[0007] In some embodiments, the light guide assembly and the illumination window are both provided with two, and the two light guide assemblies are respectively arranged on the two sides of the center line of the instrument channel pipeline and the electronic wire harness.

[0008] In some embodiments, the distance between the electronic wire harness and the instrument channel pipeline is less than 2mm.

[0009] In some embodiments, the image transmission board card is provided with an arc-shaped avoidance groove close to one side of the instrument channel pipeline.

[0010] In some embodiments, a steel wire rope traction channel is arranged in the wall surface of the bending part, and a steel wire rope is arranged in the steel wire rope traction channel.

[0011] In some embodiments, the steel wire rope traction channel is provided with four.

[0012] In some embodiments, the diameter of the auxiliary water pipeline is not less than 0.5mm, and the diameter of the electronic wire harness is not greater than 1.4mm.

[0013] In some embodiments, the minimum gap width between the instrument channel pipeline and the electronic wire harness is less than the diameters of the water and gas pipeline, the light guide assembly and the auxiliary water pipeline.

[0014] In some embodiments, the electronic wire harness is a CMOS wire harness.

[0015] In some embodiments, the bending part comprises a series of snake joints, a steel wire rope restraint ring arranged on the outer wall of the snake joint, and a steel wire rope arranged in the steel wire rope restraint ring.

[0016] In some embodiments, the water and gas pipeline and the auxiliary water supply pipeline are provided with a water and gas pipeline bending part and an auxiliary water supply pipeline bending part, respectively, and the water and gas pipeline bending part and the auxiliary water supply pipeline bending part are both deflected towards the inner wall of the head end part.

[0017] In some embodiments, adjacent snake joints are connected by a connecting part, the connecting part comprises a semi-annular insertion part arranged on the snake joint and a receiving part arranged on the adjacent snake joint and matched with the semi-annular insertion part, and the semi-annular insertion part can be deflected in the receiving part.

[0018] A transnasal endoscope comprises an operating part, a connecting part, and an insertion part of the transnasal endoscope as described above, and the insertion part, the operating part, and the connecting part are connected in sequence.

[0019] The present application has the following technical effects compared with the prior art: 1. The present application arranges the relatively hard electronic wire harness and the instrument channel pipeline diagonally, realizes the spatial separation layout of the traction cavity, and guarantees the stability of the auxiliary water supply pipeline in a small space during bending.

[0020] 2. The present application redesigns the snake joint, arranges the traction steel wire fixing ring of the snake outside, integrates the snake joint connecting shaft in the snake wall thickness, cancels the hinge rivet, improves the available space inside, forms a coherent space inside, avoids the protrusion of the rivet and the fixing ring in the snake, and further causes the scraping problem during bending.

[0021] 3. The present application arranges the head end part to meet the clinical use requirements, and under the premise of complementary interference of each functional component including the auxiliary water supply port, arranges the bending water and gas pipeline and auxiliary water supply pipeline in the head end part, i.e. the water and gas pipeline bending part and the auxiliary water supply pipeline bending part, improves the space utilization rate, improves the assembly interference with the snake and the scraping problem of the pipeline with the snake during bending, and thus takes into account the rationality of the head end part layout and the reliability of the use of each component inside. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the accompanying drawings needed in the embodiments will be briefly introduced as follows. Obviously, the accompanying drawings in the following description only are some embodiments of the present application, and for those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0023] Figure 1 The structure schematic diagram of the endoscope provided in Embodiment Two of the present application is shown in the figure. Figure 2 The structure schematic diagram of the endoscope provided in Embodiment Two of the present application is shown in the figure. Figure 1 The structure schematic diagram of the endoscope provided in Embodiment Two of the present application is shown in the figure. Figure 3 (a) is a schematic diagram of the distal end surface of the head end part; (b) is a sectional view of the head end part. Figure 4 The sectional view of the head end part provided in Embodiment Three of the present application is shown in the figure. Figure 5 The structure schematic diagram of the endoscope provided in Embodiment Three of the present application is shown in the figure. Figure 6 The sectional view of the head end part provided in Embodiment Three of the present application is shown in the figure. Figure 7 The sectional view of the head end part provided in Embodiment Three of the present application is shown in the figure. In the figure: 101, insertion part; 102, operation part; 103, connecting part. 10, head end part; 20, bending part; 30, insertion tube assembly. 1, image transfer objective window; 2, water and air nozzle; 3, illumination window; 5, instrument channel outlet; 6, auxiliary water supply outlet; 7, steel wire rope traction channel. 1-1, image transfer board card; 2-1, water and air pipeline; 3-1, light guide assembly; 5-1, instrument channel pipeline; 6-1, auxiliary water supply pipeline. 1-2, electronic wire harness. 20-1, snake bone joint; 20-2, steel wire rope; 20-3, steel wire rope restraint ring; 20-4, bearing part; 20-5, semi-annular insertion part; 20-6, auxiliary water supply pipeline bending part; 20-7, water and air pipeline bending part. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, and not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without any creative effort belong to the scope of protection of the present application.

[0025] The application aims to provide an insertion part of a transnasal endoscope and the transnasal endoscope to solve the problems in the prior art.

[0026] In order to make the above-mentioned objectives, characteristics and advantages of the application more apparent, comprehensible and easier to understand, the application will be further described in detail below with reference to the drawings and specific embodiments.

[0027] The inventor finds that in related solutions, there is a technical solution to integrate the auxiliary water supply assembly on the transnasal endoscope by increasing the diameter of the insertion part, however, this will increase the difficulty of the operation, and some solutions directly integrate the auxiliary water supply assembly in the transnasal endoscope with a diameter less than 6mm, however, in actual use, since the internal pipeline of the insertion part is pressed when it is bent, the water supply is unstable, which cannot achieve the actual water supply effect, and easily affects the work of other components, such as the water and gas delivery assembly, and the water and gas nozzle and the water and gas pipeline in the following embodiments constitute the water and gas delivery assembly. Since the transnasal endoscope enters the upper digestive tract through the nasal cavity of the patient, the size of the insertion part is limited (diameter less than 6mm), so the structure design of the insertion part section becomes a bottleneck. Therefore, the application focuses on the related design of the insertion part.

[0028] In order to solve the above-mentioned problems, the application provides the following embodiments: The embodiments of the application will be described below in combination with Figures 1 to 7 The embodiments of the application will be described below in combination with

[0029] Embodiment one The application provides an insertion part 101 of a transnasal endoscope, which comprises a head end part 10, a bending part 20 and an insertion tube assembly 30, the head end part 10, the bending part 20 and the insertion tube assembly 30 are connected in sequence; a water and gas nozzle 2, an image transmission objective window 1, an illumination window 3, an auxiliary water supply outlet 6 and an instrument channel outlet 5 are arranged on the end face of the distal end of the head end part 10, an image plate card 1-1 is arranged in the head end part 10, an electronic wire bundle 1-2, a water and gas pipeline 2-1, a light guide assembly 3-1, an instrument channel pipeline 5-1 and an auxiliary water supply pipeline 6-1 are arranged in the bending part 20 and the insertion tube assembly 30, the electronic wire bundle 1-2 extends into the head end part 10 and is connected with the image plate card 1-1, The water and gas pipeline 2-1 extends into the head end 10 and communicates with the water and gas nozzle 2, the light guide assembly 3-1 extends into the head end 10 and is aligned with the illumination window 3, the instrument channel pipeline 5-1 extends into the head end 10 and communicates with the instrument channel outlet 5, the auxiliary water supply pipeline 6-1 extends into the head end 10 and communicates with the auxiliary water supply outlet 6, the head end 10, the bending part 20 and the insertion tube are all cylindrical structures, the diameters of the electronic wire bundle 1-2 and the instrument channel pipeline 5-1 are greater than the diameters of the water and gas pipeline 2-1, the light guide assembly 3-1 and the auxiliary water supply pipeline 6-1, the distance between the line connecting the centers of the instrument channel pipeline 5-1 and the electronic wire bundle 1-2 and the center of the head end 10, the bending part 20 or the insertion tube assembly 30 is 0-1mm, that is, the line connecting the centers of the instrument channel pipeline 5-1 and the electronic wire bundle 1-2 passes through the center of the head end 10, the bending part 20 or the insertion tube assembly 30, or there is a small distance between the line connecting the centers of the instrument channel pipeline 5-1 and the electronic wire bundle 1-2 and the center of the head end 10, the bending part 20 or the insertion tube assembly 30, and the water and gas pipeline 2-1 and the auxiliary water supply pipeline 6-1 are respectively located on the two sides of the line connecting the centers of the instrument channel pipeline 5-1 and the electronic wire bundle 1-2.

[0030] The water and gas nozzle 2 in the application has two functions, one is to flush the image-forming objective window 1, and the other is to supply gas to the cavity to support the cavity for convenient observation. The image plate card 1-1 is used to acquire the image outside through the image-forming objective window 1 and transmit the image to the device outside the body, such as a computer, through the electronic wire bundle 1-2. The instrument channel outlet 5 is used for the entry and exit of surgical instruments. The illumination window 3 is used to realize the illumination in the cavity. The auxiliary water supply pipeline 6-1 is used to deliver water to the auxiliary water supply outlet 6, and by flushing the viscous bubbles, blood, dirt and other substances affecting the field of view in the digestive tract of the patient, the visibility of the gastrointestinal endoscope can be improved, the misdiagnosis rate can be reduced, and the operator can quickly find the bleeding point during the endoscopic surgery to reduce intraoperative bleeding.

[0031] In the embodiment of the application, the relatively hard electronic wire bundle 1-2 and the instrument channel pipeline 5-1 are diagonally distributed, which realizes the spatial separation layout of the traction cavity and guarantees the stability of the auxiliary water supply pipeline 6-1 in the narrow space during the bending process.

[0032] In some embodiments, the light guide assembly 3-1 and the illumination window 3 are both provided with two, and the two light guide assemblies 3-1 are respectively arranged on the two sides of the line connecting the centers of the instrument channel pipeline 5-1 and the electronic wire bundle 1-2.

[0033] The light guide assembly 3-1 in the embodiment of the application is an optical fiber, the two light guide assemblies 3-1 are symmetrically distributed, and the two illumination windows 3 are symmetrically distributed, which guarantees the uniformity of illumination and realizes the reasonable distribution of space.

[0034] In some embodiments, the distance between the electronic cable 1-2 and the instrument channel pipe 5-1 is less than 2mm.

[0035] In some embodiments, the side of the sensor board card 1-1 close to the instrument channel pipe 5-1 is provided with an arc-shaped avoidance groove. The sensor board card 1-1 can also be referred to as a sensor package board card.

[0036] In the embodiment, the sensor board card 1-1 of the head end is designed as a special-shaped structure, which is used in cooperation with the instrument channel pipe 5-1, improves the space utilization of the head end part 10, and provides the possibility of increasing the auxiliary water supply passage.

[0037] In some embodiments, the wall surface of the bending part 20 is provided with a steel wire rope traction channel 7, and the steel wire rope traction channel 7 is provided with a steel wire rope. The steel wire rope traction channel 7 is preferably provided with four.

[0038] The embodiment provides a bending driving scheme. In the preferred embodiment, the four steel wire rope traction channels 7 are ideally uniformly distributed around the circumference, but in practice, it is relatively difficult to achieve a uniform 90-degree layout due to the influence of the layout of other channels. Therefore, the design position of the four steel wire rope traction channels 7 allows deviation to adapt to the layout of other channels.

[0039] In some embodiments, the diameter of the auxiliary water supply pipe 6-1 is not less than 0.5mm, and the diameter of the electronic cable 1-2 is not greater than 1.4mm.

[0040] In some embodiments, the minimum gap between the instrument channel pipe 5-1 and the electronic cable 1-2 is less than the diameter of the water and gas pipe 2-1, the light guide assembly 3-1 and the auxiliary water supply pipe 6-1.

[0041] The embodiment can avoid the movement of the water and gas pipe 2-1, the light guide assembly 3-1 and the auxiliary water supply pipe 6-1 to the other side to cause the extrusion damage of the pipes during use.

[0042] In some embodiments, the electronic cable 1-2 is a CMOS cable.

[0043] In some embodiments, the line connecting the four steel wire rope traction channels 7 and the center of the bending part divides the internal space of the bending part into four areas, and the instrument channel pipe 5-1 and the electronic cable 1-2 respectively occupy two areas, and the auxiliary water supply pipe 6-1, the light guide assembly 3-1 and the water and gas pipe 2-1 are distributed in the remaining two areas.

[0044] The embodiment is helpful to further improve the stability of water supply and the stability of the whole device.

[0045] The specific analysis is as follows: According to the hardness analysis, the internal organ electronic wire bundle 1-2 and the instrument channel pipeline 5-1 are the hardest, the water and gas pipeline 2-1 and the auxiliary water supply pipeline 6-1 are the second hardest, and the light guide assembly 3-1 is the softest. Figure 4 As shown in the figure, the electronic wire bundle 1-2 and the instrument channel pipeline 5-1 are distributed in a diagonal line, and since they are the hardest and have a larger size, the electronic wire bundle 1-2 and the instrument channel pipeline 5-1 abut each other during the bending process, and together with the four-way steel wire rope traction channel 7, realize the spatial separation layout of the internal traction cavity of the bending part, and guarantee the limited movement range of the electronic wire bundle 1-2 and the instrument channel pipeline 5-1 during the bending process, so as not to squeeze the movement space of the water and gas pipeline 2-1, the auxiliary water supply pipeline 6-1 and the light guide assembly 3-1. Thus, the stability of the auxiliary water supply pipeline 6-1 during the bending process is guaranteed.

[0046] In summary, through the head-end precise structure layout design and the bending part hardness consideration, the head-end high utilization layout of each component and the spatial separation layout of each internal organ in the traction cavity are realized, so that the integrated auxiliary water supply function under extremely fine scale is realized.

[0047] Embodiment two The embodiment of the present application provides a transnasal endoscope, which comprises an operating part 102, a connecting part 103 and a transnasal endoscope insertion part 101 as described above. The insertion part 101, the operating part 102 and the connecting part 103 are connected in sequence, the auxiliary water supply pipeline 6-1 penetrates through the three components of the operating part 102, the connecting part 103 and the insertion part 101, the auxiliary water supply pipe joint of the connecting part 103 is connected with an external auxiliary water supply device to supply water, and the water successively passes through the internal auxiliary water supply pipeline 6-1 of the operating part 102, the internal auxiliary water supply pipeline 6-1 of the insertion part 101, and is finally sprayed out from the auxiliary water supply port of the head end.

[0048] The embodiment of the present application distributes the relatively hard electronic wire bundle 1-2 and the instrument channel pipeline 5-1 in a diagonal line, realizes the spatial separation layout of the traction cavity, and guarantees the stability of the auxiliary water supply pipeline 6-1 during the bending process in the narrow space.

[0049] Embodiment three The transnasal endoscope provided by the embodiment of the present application comprises an operation part 102, a connecting part 103 and the insertion part 101 of the transnasal endoscope as described above, wherein the bending part 20 comprises a snake bone joint 20-1 connected in sequence, a steel wire rope restraint ring 20-3 arranged on the outer wall of the snake bone joint 20-1, and a steel wire rope 20-2 arranged in the steel wire rope restraint ring 20-3; the water and gas pipeline 2-1 and the auxiliary water supply pipeline 6-1 are arranged with a water and gas pipeline bending part and an auxiliary water supply pipeline bending part, respectively, and the water and gas pipeline bending part and the auxiliary water supply pipeline bending part are both deflected to the inner wall of the head end part; the adjacent snake bone joints 20-1 are connected through the connecting part, and the connecting part comprises a semi-annular insertion part 20-5 arranged on the snake bone joint 20-1 and a receiving part 20-4 arranged on the adjacent snake bone joint 20-1 and matched with the semi-annular insertion part 20-5, and the semi-annular insertion part 20-5 can be deflected in the receiving part 20-4.

[0050] In summary, the snake bone joint is designed in the present application, the traction steel wire fixing ring of the snake bone is arranged outside, the snake bone joint connecting shaft is integrated in the snake bone wall thickness, the rivet for connection is cancelled, the available space inside is improved, the continuous space is formed inside, the rivet and the fixing ring are prevented from forming the protrusion inside the snake bone, and the scratching problem during bending is further avoided; the layout of the head end part meets the clinical use requirements, each functional component including the auxiliary water supply port is complementary to the interference, the water and gas pipeline 2-1 and the auxiliary water supply pipeline 6-1 are arranged in the head end part, that is, the water and gas pipeline bending part and the auxiliary water supply pipeline bending part, the space utilization is improved, the assembly interference with the snake bone and the scratching problem of the pipeline with the snake bone during bending are improved, and the layout rationality of the head end part and the reliability of the use of each component inside are considered.

[0051] The principle and implementation mode of the present application are described by using specific examples in the present application, and the above embodiment is only used to help understand the method of the present application and the core idea thereof; meanwhile, for the general technical personnel in the field, the specific implementation mode and the application range will be changed according to the idea of the present application. In summary, the content of the present application should not be understood as the limitation of the present application.

Claims

1. A transnasal endoscope insertion section, characterized by: include: The head end, the bend, and the insertion tube assembly are connected in sequence; The distal end face of the head end is constructed with a water / air nozzle, an image transmission objective window, an illumination window, an auxiliary water supply outlet, and an instrument channel outlet. An image transmission plate is disposed within the head end. An electronic wire harness, a water / air conduit, a light guide assembly, an instrument channel conduit, and an auxiliary water supply conduit are disposed within the curved portion and insertion tube assembly. The electronic wire harness extends into the head end and connects to the image transmission plate. The water / air conduit extends into the head end and communicates with the water / air nozzle. The light guide assembly extends into the head end and is aligned with the illumination window. The instrument channel conduit extends into the head end and communicates with the... The instrument channel outlet is connected, and the auxiliary water supply pipeline extends into the head end and connects to the auxiliary water supply outlet. The head end, the bend, and the insertion tube are all cylindrical structures. The diameter of the electronic wire bundle and the instrument channel pipeline is larger than the diameter of the water-air pipeline, the light guide assembly, and the auxiliary water supply pipeline. The distance between the line connecting the center of the instrument channel pipeline and the center of the electronic wire bundle and the center of the head end, the bend, or the insertion tube assembly is 0~1mm. The water-air pipeline and the auxiliary water supply pipeline are located on both sides of the line connecting the center of the instrument channel pipeline and the center of the electronic wire bundle.

2. The transnasal endoscopic insertion section according to claim 1, characterized by: Two light guide components and two lighting windows are provided, with the two light guide components respectively located on both sides of the line connecting the center of the instrument channel and the center of the electronic wire bundle.

3. The transnasal endoscopic insertion section according to claim 1, characterized by: The distance between the electronic wire harness and the instrument channel tubing is less than 2 mm.

4. The transnasal endoscopic insertion section according to claim 1, characterized by: The image transmission board is provided with an arc-shaped avoidance groove on the side near the instrument channel pipeline.

5. The transnasal endoscopic insertion section according to claim 1, characterized by: A wire rope traction channel is provided inside the wall of the curved section, and a wire rope is installed inside the wire rope traction channel.

6. The transnasal endoscopic insertion section according to claim 5, characterized by: The steel wire rope traction channel is provided with four channels.

7. The transnasal endoscopic insertion section according to claim 1, characterized by: The diameter of the auxiliary water supply pipeline is not less than 0.5 mm, and the diameter of the electronic wire harness is not greater than 1.4 mm.

8. The transnasal endoscopic insertion section according to claim 1, characterized by: The minimum gap width between the instrument channel and the electronic wire bundle is smaller than the diameter of the water and gas pipeline, the light guide assembly, and the auxiliary water supply pipeline.

9. The transnasal endoscopic insertion section according to claim 1, characterized by: The electronic wire harness is a CMOS wire harness.

10. The transnasal endoscopic insertion section according to claim 1, characterized by: The curved section includes a snake-bone joint that is hinged in sequence and a wire rope restraint ring disposed on the outer wall of the snake-bone joint, wherein a wire rope is threaded through the wire rope restraint ring.

11. The transnasal endoscopic insertion section according to claim 10, characterized by: The portions of the water-gas pipeline and the auxiliary water supply pipeline located inside the head end are respectively provided with a water-gas pipeline bend and an auxiliary water supply pipeline bend, and both the water-gas pipeline bend and the auxiliary pipeline bend are deflected toward the inner wall of the head end.

12. The transnasal endoscopic insertion section according to claim 10, characterized by: The adjacent snake joints are hinged by a connecting part, which includes a semi-circular insertion part disposed on the snake joint and a receiving part disposed on the adjacent snake joint and matching the semi-circular insertion part. The semi-circular insertion part can be bent within the receiving part.

13. A transnasal endoscope, characterized by: include: The instrument comprises an operating part, a connecting part, and an insertion part of a transnasal endoscope as described in any one of claims 1 to 12, wherein the insertion part, the operating part, and the connecting part are connected in sequence.

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