CN110115617A - For the sheath of endoscope, sheath end, protective case component and endoscopic apparatus - Google Patents

Abstract

The invention discloses a sheath for an endoscope. The sheath includes a rod part with a first cavity. The inside of the first cavity of the rod part has an inwardly protruding spacer part, and the spacer part is along the rod part. Extend; there are multiple spacers, holes are set in one or more spacers, and the holes extend along the rod to form the first liquid flow path. The present invention also provides a sheath tip, a protective sheath assembly comprising the sheath and the sheath tip, an endoscope device, and a method for maintaining the clarity of an endoscope lens. The protective sheath assembly of the invention reduces the difficulty of processing technology, can more effectively realize gas-liquid separation and transportation, and can allow air and liquid flows to wash the endoscope lens more effectively.

Description

Sheath for endoscope, sheath tip, protective sheath assembly and endoscope equipment

technical field

The invention relates to the field of medical instruments, in particular to a sheath for an endoscope, a sheath end and a protective sheath assembly, and also relates to an endoscope device.

Background technique

Typically, minimally invasive surgery uses an endoscope, such as a laparoscope. Since the endoscope is inside the human body, the environment is generally warm and humid. Also, the use of devices such as harmonic scalpels or other cutting and coagulating instruments can generate fumes and debris. This smoke and debris, as well as fragments of body tissue or other body material, may touch or even adhere to the lens. These conditions can significantly reduce the clarity of the endoscope's field of view, or even cause complete loss of visibility. Generally, to restore clarity and remove debris, the endoscope must be removed from the body cavity and kept clean by wiping with a cloth. And so being forced to interrupt the surgical field of view brings serious hidden dangers to the safety of the surgical operation and delays the effective operation time of the operation.

To solve this problem, Chinese patent application number 200980156794.8 titled "System and method for optimizing and maintaining visualization of surgical field during use of surgical speculum" discloses a system using a field of view optimization assembly with a deflector assembly and method, this deflector assembly has important physical, pneumatic, and optical properties that enable intraoperative defogging, surgical debris deflection, and laparoscopic lens cleaning during minimally invasive procedures, while also maintaining visualization of the surgical site. The field-of-view optimization assembly may have a quick-change nature that enables surgical approaches for maintaining clear visualization, including enabling laparoscopes with different operating characteristics (e.g., with different tip angles, lengths, etc.) all over the sterile surgical field. , or diameter) are quickly changed without disturbing pre-existing surgical arrangements on the sterile surgical field. The field of view optimization component integrates with an existing set of minimally invasive instruments. It does not interfere with surgical scheduling and requires minimal changes in the procedures or habits of the surgical operating room (OR) team.

Although the Chinese patent application No. 200980156794.8 titled "System and Method for Optimizing and Maintaining Visualization of the Surgical Field During Using a Surgical Speculum" effectively solved the problem of operational inconvenience caused by the reduced visibility of the lens during surgery, the Chinese The apparatus and method provided by the patent application still have the following defects: (1) The sheath wall of the product is thick, and a trocar of a larger size needs to be used when using a laparoscope of the same specification. (2) The product structure is complicated and the cost is high. (3) The operation of the product is not flexible enough, and the puncture device connected to the air flow pipeline is in the normally open state of the air circuit, and the air circuit cannot be closed. (4) The air bag of the existing similar product should be located on the air flow pipeline instead of the infusion pipeline.

Contents of the invention

In view of the above-mentioned defects in the prior art, the technical problem to be solved by the present invention is to provide a new sheath for endoscopes and its components, which can overcome the inconvenience of operation caused by the reduction of lens visibility during surgery. In addition, it can reduce the outer diameter of the rod of the entire laparoscopic product to match the trocar with a smaller size, and can better achieve gas-liquid separation.

In order to achieve the above object, the first aspect of the present invention provides a sheath for an endoscope, the sheath includes a shaft with a first cavity, the interior of the first cavity of the shaft has a Inwardly protruding spacers, the spacers extend along the rod; there are multiple spacers, holes are provided in one or more of the spacers, and the holes extend along the rod A first liquid flow path is formed.

Further, the space between two adjacent partitions forms a first gas flow path.

Further, the number of the holes is less than or equal to the number of the spacers.

Further, one or more holes are provided in the same spacer.

Further, the cross-sectional area of the first liquid flow path is not less than 0.4 mm ² .

Further, the shape of the cross-sectional area of the first liquid flow channel is circular or elliptical.

Further, the spacer makes the inner wall of the rod part form a first inner wall segment and a second inner wall segment, and the cross section of the first inner wall segment is arc-shaped.

Further, the cross-section of the second inner segment is arc-shaped.

Further, the stem of the sheath is made of elastic material.

Further, the elastic material is selected from one of soft PVC, soft TPU, soft TPE and rubber.

Further, the diameter of the circle where the cross-section of the first inner wall segment is located is 9.8-10.2 mm, and the diameter of the circle where the cross-section of the second inner wall segment is located is 10.8-11.2 mm.

Further, the stem of the sheath is made of rigid material.

Further, the diameter of the circle where the cross-section of the first inner wall section is located is 10-10.3 mm, and the diameter of the circle where the cross-section of the second inner wall section is located is 11-11.3 mm.

Further, the cross-section of the outer wall of the shaft of the sheath is circular, and the diameter of the cross-section of the outer wall of the shaft of the sheath is 12.24-12.44 mm.

The second aspect of the present invention provides a sheath end, the sheath end is arranged on the first end of any one of the above sheaths, the sheath end has a second cavity, so that the sheath The sheath end has an inner wall and an outer wall, and the inner wall of the sheath end cooperates with the outer wall of the endoscopic lens sheathed in the sheath end to form a first cavity, and the first cavity is along the sheath The length direction of the sheath end extends to form a second gas flow path; a second cavity is provided between the inner wall and the outer wall of the sheath end, and the second cavity extends along the length direction of the sheath end to form A second liquid flow path, the second liquid flow path communicates with the first liquid flow path.

Further, the space between two adjacent partitions forms a first gas flow path, and the second gas flow path communicates with the first gas flow path.

Further, the end of the sheath is made of light-transmitting material.

Further, the number of the holes is less than or equal to the number of the spacers.

Further, the end of the sheath end has an extension, and the extension can block the extension of the sheath protruding from the sheath end.

Further, the extension part extends along the radial direction of the sheath tip or deviates from the radial direction.

Further, the first cavity and the second cavity extend in the extension portion, that is, the second gas flow path and the second liquid flow path extend in the extension portion.

Further, a protrusion is provided at the outlet of the second cavity of the extension, and the protrusion reduces the size of the outlet of the second cavity.

Further, the extension part has a notch, and the notch extends along the thickness direction of the extension part in the longitudinal direction and expands toward the inner wall of the sheath end in the transverse direction.

Further, the notch makes the extension part a semi-closed ring.

Further, the cross-sectional area of the first liquid flow path is not less than 0.4 mm ² .

Further, the shape of the cross-sectional area of the first liquid flow channel is circular or elliptical.

Further, the spacer makes the inner wall of the rod part form a first inner wall segment and a second inner wall segment, and the cross-sections of the first inner wall segment and the second inner wall segment are arc-shaped.

Further, the stem of the sheath is made of elastic material.

Further, the elastic material is selected from one of soft PVC, soft TPU, soft TPE and rubber.

Further, the diameter of the circle where the cross-section of the first inner wall segment is located is 9.8-10.2 mm, and the diameter of the circle where the cross-section of the second inner wall segment is located is 10.8-11.2 mm.

Further, the stem of the sheath is made of rigid material.

Further, the diameter of the circle where the cross-section of the first inner wall section is located is 10-10.3 mm, and the diameter of the circle where the cross-section of the second inner wall section is located is 11-11.3 mm.

Further, the cross-section of the outer wall of the shaft of the sheath is circular, and the diameter of the cross-section of the outer wall of the shaft of the sheath is 12.24-12.44 mm.

Further, the rod part of the sheath also has a second end, the second end is connected with the gas equipment, and the gas discharged from the gas equipment enters the gas flow path through the second end.

A third aspect of the present invention provides a protective sheath assembly for an endoscope, including any one of the above sheaths and any one of the above sheath ends, the sheath end is arranged on the sheath the first end of .

A fourth aspect of the present invention provides an endoscopic device, including an endoscopic assembly, the endoscopic assembly includes a tubular rod, an endoscopic lens is arranged inside the tubular rod, and the endoscopic device It also includes any one of the above-mentioned sheaths and any one of the above-mentioned sheath ends; wherein, the first cavity of the stem of the sheath and the second cavity of the sheath end are used to accommodate the inner The tubular rod of the endoscope assembly, the inner wall of the rod of the sheath and the outer wall of the tubular rod of the endoscope assembly are separated by the spacer, so that a first gas is formed between two adjacent spacers flow path.

A fifth aspect of the present invention provides a method for maintaining the sharpness of an endoscopic lens, the method comprising the steps of:

(1) An endoscope assembly is provided, the endoscope assembly includes a tubular rod, and an endoscopic lens is arranged in the tubular rod;

(2) Provide a protective sheath assembly, the protective sheath assembly includes a sheath and a sheath end disposed at a first end of the sheath, the first cavity and the sheath end that the stem of the sheath has The second cavity of the head is used to accommodate the tubular rod of the endoscope assembly, the inner wall of the rod of the sheath is separated from the outer wall of the tubular rod of the endoscope assembly by the spacer, A first gas flow path is formed between two adjacent spacers; there are multiple spacers, and holes are provided in one or more of the spacers, and the holes extend along the rod to form a second gas flow path. a fluid flow path;

(3) A gas flow is provided such that the gas flow passes through the first gas flow passage to the distal end of the tubular shaft and flows over the outer surface of the endoscopic lens.

Further, the inner wall of the end of the sheath cooperates with the outer wall of the endoscopic lens to form a first cavity, and the first cavity extends along the length direction of the end of the sheath to form a second gas flow path , the second gas flow path communicates with the first gas flow path; a second cavity is provided between the inner wall and the outer wall of the sheath end, and the second cavity is along the sheath end The lengthwise extension of the head forms a second liquid flow path, and the second liquid flow path communicates with the first liquid flow path.

Further, the end of the sheath end has an extension, and the extension can block the extension of the sheath protruding from the sheath end.

Further, the first cavity and the second cavity extend in the extension portion, that is, the second gas flow path and the second liquid flow path extend in the extension portion.

Further, a protrusion is provided at the outlet of the second cavity of the extension, and the protrusion reduces the size of the outlet of the second cavity.

Further, the method further includes the following steps: (4) providing a liquid flow such that the liquid flow sequentially passes through the first liquid flow path and the second liquid flow path to reach the distal end of the tubular rod, and flow over the outer surface of the endoscopic lens.

Compared with the prior art, the present invention has the following advantages:

1. The present invention reduces the difficulty of processing by increasing the wall thickness of the sheath and reducing the number of cavities; by adding independent cavities, the separation of gas and liquid is realized. The sheath of the invention has unique physical and fluid properties, and can provide airflow and cleaning liquid for cleaning the lens when the endoscope is inserted into the body cavity.

2. The end of the sheath of the present invention has unique physical and optical properties, and can make the airflow and cleaning liquid introduced by the sheath accurately and effectively clean the endoscope lens without affecting the field of view of the endoscope lens.

The idea, specific structure and technical effects of the present invention will be further described below in conjunction with the accompanying drawings, so as to fully understand the purpose, features and effects of the present invention.

Description of drawings

Fig. 1 is a schematic structural view of a protective sheath assembly for an endoscope according to a preferred embodiment of the present invention;

Fig. 2 is a schematic cross-sectional view of a first structure of the stem of the sheath of the protective sheath assembly in Fig. 1 (according to A-A in Fig. 1);

Fig. 3 is a schematic cross-sectional view (taken according to A-A in Fig. 1 ) of the first middle structure of the stem of the sheath of the protective sheath assembly in Fig. 1, the tubular stem of the endoscope assembly is not shown in the figure;

Fig. 4 is a schematic cross-sectional view of a second structure of the stem of the sheath of the protective sheath assembly in Fig. 1 (taken according to A-A in Fig. 1);

Fig. 5 is a schematic cross-sectional view of a third structure of the stem of the sheath of the protective sheath assembly in Fig. 1 (according to A-A in Fig. 1);

Fig. 6 is a schematic structural view of the sheath end of the protective sheath assembly in Fig. 1;

Fig. 7 is a schematic structural view of the sheath end of the protective sheath assembly in Fig. 1, showing the tubular rod of the endoscope assembly;

Fig. 8 is a schematic cross-sectional view of Fig. 7;

Fig. 9 is a schematic diagram along the B-B section of Fig. 8;

FIG. 10 is a schematic diagram of the section along C-C in FIG. 8 .

Detailed ways

The term "proximal end" used herein should be understood as the end facing the operator during the operation; the term "distal end" used herein should be understood as the end facing the object to be operated during the operation.

The abbreviation "PVC" used herein refers to polyvinyl chloride; the abbreviation "TPU" used herein refers to thermoplastic polyurethane elastomer; the abbreviation "TPE" used herein refers to thermoplastic polyolefin-based elastomer.

As shown in FIGS. 1-6 , a preferred embodiment of the present invention provides an endoscope device, including an endoscope assembly and a protective sheath assembly 10 . The endoscope assembly is used for imaging and sending image information to the image display device, including a tubular rod 21 , an endoscopic lens is arranged inside the tubular rod 21 , and the endoscopic lens is located inside the distal end of the tubular rod 21 . The arrangement of the endoscope assembly is well known to those skilled in the art, and its structure (including the configuration of the cold light source) will not be described in detail here.

The protective sheath assembly 10 includes a sheath 20 and a sheath tip 30 , and the sheath tip 30 is disposed at a first end (ie, a distal end) of the sheath 20 . Wherein, the sheath 20 includes a rod portion 223 having a first cavity 201, the inside of the first cavity 201 of the rod portion 223 has an inwardly protruding spacer portion 224, and the spacer portion 224 extends along the rod portion 223; the spacer portion 224 is provided There are a plurality of holes 23 arranged in one or more spacers 224 , and the holes 23 extend along the rod portion 223 to form a first liquid flow path. The cross-sectional area of the first liquid flow path is not less than 0.4 mm ² . The space between two adjacent partitions 224 forms the first gas flow passage 22 . The number of holes 23 is less than or equal to the number of partitions 224 . One or more holes 23 may also be provided in the same spacer 224 .

In a preferred embodiment of the present invention, the spacer portion 224 makes the inner wall of the rod portion 223 form a first inner wall segment 221 and a second inner wall segment 222 , and the cross sections of the first inner wall segment 221 and the second inner wall segment are arc-shaped. If the rod portion 223 of the sheath 20 is made of elastic material, and the elastic material is selected from one of soft PVC, soft TPU, soft TPE and rubber, the diameter of the circle where the cross section of the first inner wall section 221 is located is 9.8-10.2 mm, and the diameter of the circle where the cross-section of the second inner wall section 222 is located is 10.8-11.2 mm. If the rod portion 223 of the sheath 20 is made of a rigid material, the diameter of the circle where the cross section of the first inner wall section 221 is located is 10-10.3 mm, and the diameter of the circle where the cross section of the second inner wall section 222 is located is 11-11.3 mm. mm. The cross-section of the outer wall of the stem portion 223 of the sheath 20 is circular, and the diameter of the cross-section of the outer wall of the stem portion 223 of the sheath 20 is 12.24-12.44 mm. The above is a preferred embodiment, in other embodiments, the material and size of the rod member of the sheath 20 can be selected according to needs.

2 to 5 show schematic diagrams of three structures of the rod 223 of the sheath 20, but are not limited thereto. Generally speaking, the sheath 20 cooperates with the tubular rod 21 of the endoscope assembly to form a cavity. Body, and one or more holes 23 are opened on the sheath 20, and the technical solutions for realizing the two-way passage of transporting gas and transporting cleaning liquid all belong to the scope of the sheath 20 of the present invention.

2 and 3 show schematic cross-sectional views of the first configuration of the shaft portion 223 of the sheath 20 . The sheath 20 includes a stem portion 223 having a first cavity 201 , and the interior of the first cavity 201 of the stem portion 223 has three spacers 224 protruding inward, and the spacer portions 224 extend along the stem portion 223 . Preferably, the distances between adjacent spacers 224 are equal. A hole 23 is provided in one of the spacer parts 224 , and the hole 23 extends along the rod part 223 to form a first liquid flow path. The space between two adjacent partitions 224 forms the first gas flow passage 22 . In this structure, the first cavity 201 of the rod portion 223 of the sheath 20 can accommodate the tubular rod 21 of the endoscope assembly, and the tubular rod 21 of the endoscope with a rod diameter of 10 mm fits with the sheath 20 . The inner diameter of the rod part 223 of the sheath 20 is 10.2 mm, and when it is loosely fitted with the tubular rod part 21 of the endoscope, it can be easily inserted and withdrawn. The inner wall of the rod portion 223 of the sheath 20 is separated from the outer wall of the tubular rod 21 of the endoscope assembly by a partition 224 , so that the first gas flow passage 22 is formed between two adjacent partitions 224 . As shown in FIG. 3, three first gas flow passages 22 are formed.

Theoretically, the larger the diameter of the circle where the cross-section of the second inner wall section 222 is located, the better the performance of gas transport, but on the other hand, the sheath 20 will be too thin and difficult to process. In this embodiment, the diameter of the circle where the cross-section of the first inner wall segment 221 of the inner wall of the rod portion 223 of the sheath 20 is 10.2 mm, and the diameter of the circle where the cross-section of the second inner wall segment 222 is 11.2 mm, the sheath The outer diameter of the sleeve 20 is 12.5 mm.

In this embodiment, the shape of the hole 23 , that is, the shape of the cross-sectional area of the first liquid flow path is circular, and the hole diameter is 0.75 mm. But it is not limited thereto, and may also be elliptical in other embodiments. An increase in the size of the hole 23 can improve the liquid passing capacity.

During use, the rod portion 223 of the sheath 20 wraps the tubular rod 21 of the endoscope assembly and enters the human body through the inner hole of the trocar (diameter of the inner hole of the trocar is 12.65 mm). In the state of maintaining penetration, the first gas flow channel 22 can continuously transport anhydrous CO ₂ , and the first liquid flow channel can transport cleaning liquid, thereby realizing gas-liquid separation transport.

FIG. 4 shows a schematic cross-sectional view of the second structure of the rod portion 223 of the sheath 20 . Different from the above-mentioned first structure, the inside of the first cavity 201 of the rod portion 223 has four inwardly protruding spacers 224 , preferably, the distances between adjacent spacers 224 are equal. A hole 23 is provided in one of the spacer parts 224 , and the hole 23 extends along the rod part 223 to form a first liquid flow path. The space between two adjacent partitions 224 forms the first gas flow passage 22 .

In order to improve the liquid passing ability, the number of holes 23 can also be increased. As shown in FIG. 5 , a schematic cross-sectional view of a third structure of the rod portion 223 of the sheath 20 is given. There are four inwardly protruding spacers 224 inside the first cavity 201 of the rod portion 223 , preferably, the distances between adjacent spacers 224 are equal. A hole 23 is disposed in each of the two spacers 224 , and the hole 23 extends along the rod portion 223 to form a first liquid flow path. The space between two adjacent partitions 224 forms the first gas flow passage 22 .

In a preferred embodiment of the present invention, as shown in FIGS. 6-10 , the sheath tip 30 has a second cavity 301, so that the sheath tip 30 has an inner wall and an outer wall, and the inner wall of the sheath tip 30 and the sheath The outer wall of the endoscopic lens sheathed in the end 30 cooperates, and the gap between the inner wall of the sheath end 30 and the outer wall of the endoscopic lens forms a first cavity, and the first cavity is along the length direction of the sheath end 30 Extending to form a second gas flow path 32, the second gas flow path 32 communicates with the first gas flow path 22; a second cavity is provided between the inner wall and the outer wall of the sheath end 30, and the second cavity is along the sheath The length direction of the end 30 extends to form a second liquid flow path 33, and the second liquid flow path 33 communicates with the first liquid flow path. In other embodiments, the above-mentioned first cavity may also be disposed between the inner wall and the outer wall of the sheath tip 30 , but is independent of the second cavity. During use, the anhydrous CO transported by the first gas flow path 22 of the sheath ₂₀ is finally transported to the second gas flow path of the sheath tip 30, and the cleaning solution transported by the first liquid flow path of the sheath 20 is finally transported. is transported into the second liquid flow path 33 of the sheath tip 30 .

In this embodiment, the sheath end 30 is made of high light-transmitting material, which ensures that the illumination intensity of the endoscope is not weakened.

Further, the end of the sheath tip 30 has an extension 35 , and the extension 35 can block the extension 35 of the sheath 20 protruding from the sheath tip 30 . The extension part 35 extends along the radial direction of the sheath head 30 or deviates from the radial direction. The first cavity and the second cavity extend in the extension portion 35 , that is, the second gas flow path 32 and the second liquid flow path 33 extend in the extension portion 35 . A protrusion 322 is provided at the outlet of the second cavity of the extension part 35, and the protrusion 322 makes the size of the outlet of the second cavity smaller. In addition, the extension part 35 has a notch 34 that extends longitudinally along the thickness direction of the extension part 35 and expands laterally toward the inner wall of the sheath tip 30 . The notch 34 makes the extension 35 a semi-closed ring. The notch 34 ensures that the viewing angle of the endoscope is not blocked by the extension 35 of the sheath tip 30 .

During use, the anhydrous _CO2 transported by the first gas flow path 22 of the sheath 20 is blown out from the first cavity of the sheath tip 30, and the cleaning solution transported by the first liquid flow path of the sheath 20 is blown out from the sheath end. The second cavity of the head 30 is sprayed out, and after the sprayed cleaning liquid rinses the lens surface of the endoscope, anhydrous CO ₂ blows away debris from the gap 34 .

Figure 9 and Figure 10 describe the fluid characteristics of the sheath tip 30, the center sprays cleaning liquid (see arrow 401), and the periphery blows out anhydrous CO ₂ gas (see arrow 400), which can be seen from the BB section (Figure 9) To, the hole 23 on the sheath 20 communicates with the second cavity of the sheath tip 30, that is, the first liquid flow path communicates with the second liquid flow path 33, and is directly aligned with the lens surface of the endoscope, and the gap 34.

It can be seen from the CC section ( FIG. 10 ) that the first gas flow path 22 on the sheath 20 communicates with the first cavity of the sheath tip 30 , especially, at the extension part 35 of the sheath tip 30 A protrusion 322 is provided at the outlet of the second cavity, so that the size of the outlet of the second cavity becomes smaller, forming a narrow gap of 0.2mm with the lens surface of the endoscope. The narrow gap allows the blown anhydrous CO ₂ to produce the Coanda effect, allowing the airflow to flow along the lens surface of the endoscope, thereby effectively cleaning the lens surface of the endoscope.

In a preferred embodiment of the present invention, the rod portion 223 of the sheath 20 also has a second end (ie, a proximal end), the second end is connected to the gas equipment, and the gas discharged from the gas equipment enters the gas flow path through the second end.

Preferred embodiment of the present invention also provides a kind of method for maintaining the sharpness of endoscopic lens, and this method comprises the following steps:

(1) provide an endoscope assembly, the endoscope assembly includes a tubular rod 21, the distal end of the distal end of the tubular rod 21 is provided with an endoscope lens;

(2) Provide the protective sheath assembly 10 in the above embodiment, the protective sheath assembly 10 includes the sheath cover 20 and the sheath cover tip 30 arranged at the first end of the sheath cover 20, the first end 223 of the sheath cover 20 has The cavity 201 and the second cavity 301 of the sheath tip 30 are used to accommodate the tubular rod 21 of the endoscope assembly, the inner wall of the rod 223 of the sheath 20 and the outer wall of the tubular rod 21 of the endoscope assembly Spaced by spacers 224, so that the first gas flow passage 22 is formed between two adjacent spacers 224; there are multiple spacers 224, and holes 23 are arranged in one or more spacers 224, and the holes 23 are arranged along the rod. Portion 223 extends to form a first liquid flow path;

(3) The gas flow is provided so that the gas flow passes through the first gas flow passage 22 to the distal end of the tubular rod 21 and flows over the outer surface of the endoscopic lens.

(4) The liquid flow is provided so that the liquid flow passes through the first liquid flow path and the second liquid flow path 33 to the distal end of the tubular rod 21 in sequence, and flows over the outer surface of the endoscopic lens.

The preferred specific embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make many modifications and changes according to the concept of the present invention without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the present invention through logical analysis, reasoning or limited experiments on the basis of the prior art shall be within the scope of protection defined by the claims.

Claims (42)

1. a kind of sheath for endoscope, which is characterized in that the sheath includes the bar portion with the first cavity, the bar portion The inside of the first cavity there is inwardly projecting spacer portion, the spacer portion extends along the bar portion；The spacer portion setting Have multiple, hole is provided in one or more spacer portions, the hole extends to form the flowing of the first liquid along the bar portion Access.

2. sheath according to claim 1, which is characterized in that the space between two neighboring spacer portion forms first gas Flow passage.

3. sheath according to claim 1, which is characterized in that the quantity in the hole is less than or equal to the number of the spacer portion Amount.

4. sheath according to claim 1, which is characterized in that be provided with one or more in the same spacer portion Hole.

5. sheath according to claim 1, which is characterized in that the cross-sectional area of first liquid flow passageway is not less than 0.4mm²。

6. sheath according to claim 1, which is characterized in that the shape of the cross-sectional area of first liquid flow passageway It is round or oval.

7. sheath according to claim 1, which is characterized in that the spacer portion makes the inner wall of bar portion form the first inner wall Section and the second inner wall section, the cross section of first inner wall section are arc-shaped.

8. sheath according to claim 7, which is characterized in that the cross section of second inner section is arc-shaped.

9. sheath according to claim 8, which is characterized in that the bar portion of the sheath is made of elastic material.

10. sheath according to claim 9, which is characterized in that the elastic material is selected from flexible PVC, soft TPU, soft One of matter TPE and rubber.

11. sheath according to claim 9, which is characterized in that circle where the cross section of first inner wall section it is straight Diameter is 9.8~10.2mm, and the diameter of a circle where the cross section of second inner wall section is 10.8~11.2mm.

12. sheath according to claim 8, which is characterized in that the bar portion of the sheath is made of rigid material.

13. sheath according to claim 12, which is characterized in that circle where the cross section of first inner wall section it is straight Diameter is 10~10.3mm, and the diameter of a circle where the cross section of second inner wall section is 11~11.3mm.

14. sheath according to claim 1, which is characterized in that the cross section of the outer wall of the bar portion of the sheath is circle, The diameter of the cross section of the outer wall of the bar portion of the sheath is 12.24~12.44mm.

15. a kind of sheath end, which is characterized in that sheath according to claim 1 is arranged in the sheath end First end, the sheath end have the second cavity, so that the sheath end has inner and outer wall, the sheath end The outer wall for the endoscope being arranged in inner wall and the sheath end cooperates, and forms the first cavity, first cavity is along the sheath The length direction of set end extends to form second gas flow passage；Is provided between the inner and outer wall of the sheath end Two cavitys, length direction of second cavity along the sheath end extend to form second liquid flow passage, and described second Liquid flow passageway is connected with first liquid flow passageway.

16. sheath end according to claim 15, which is characterized in that space between two neighboring spacer portion forms the One gas flow path, the second gas flow passage are connected with the first gas flow passage.

17. sheath end according to claim 15, which is characterized in that the sheath end is made of translucent material.

18. sheath end according to claim 15, which is characterized in that the quantity in the hole is less than or equal to the interval The quantity in portion.

19. sheath end according to claim 15, which is characterized in that the end of the sheath end has extension, The extension that the extension can stop the sheath to be stretched out from the sheath end.

20. sheath end according to claim 19, which is characterized in that radial direction of the extension along the sheath end Or it is radially extended described in deviateing.

21. sheath end according to claim 19, which is characterized in that first cavity and second cavity are in institute It states in extension and extends, i.e., the described second gas flow passage and the second liquid flow passage prolong in the extension It stretches.

22. sheath end according to claim 21, which is characterized in that in the exit of the second cavity of the extension It is provided with protrusion, the protrusion makes the size of the outlet of second cavity become smaller.

23. sheath end according to claim 15, which is characterized in that the extension has notch, and the notch exists On longitudinal direction along the extension thickness direction extend and horizontally to the sheath end inner wall Directional Extension.

24. sheath end according to claim 23, which is characterized in that the notch makes the extension be semiclosed Annular.

25. sheath end according to claim 15, which is characterized in that the cross-sectional area of first liquid flow passageway Not less than 0.4mm²。

26. sheath end according to claim 15, which is characterized in that the cross-sectional area of first liquid flow passageway Shape be round or oval.

27. sheath end according to claim 15, which is characterized in that the spacer portion makes the inner wall of bar portion form the The cross section of one inner wall section and the second inner wall section, the cross section of first inner wall section and second inner section is arc-shaped.

28. sheath end according to claim 27, which is characterized in that the bar portion of the sheath is made of elastic material.

29. sheath end according to claim 28, which is characterized in that the elastic material is selected from flexible PVC, soft One of TPU, soft TPE and rubber.

30. sheath end according to claim 28, which is characterized in that the circle where the cross section of first inner wall section Diameter be 9.8~10.2mm, diameter of a circle where the cross section of second inner wall section is 10.8~11.2mm.

31. sheath end according to claim 27, which is characterized in that the bar portion of the sheath is made of rigid material.

32. sheath end according to claim 31, which is characterized in that the circle where the cross section of first inner wall section Diameter be 10~10.3mm, diameter of a circle where the cross section of second inner wall section is 11~11.3mm.

33. sheath end according to claim 15, which is characterized in that the cross section of the outer wall of the bar portion of the sheath is Circle, the diameter of the cross section of the outer wall of the bar portion of the sheath are 12.24~12.44mm.

34. sheath end according to claim 15, which is characterized in that the bar portion of the sheath also has second end, institute It states second end to connect with gas apparatus, the gas of the gas apparatus discharge enters gas flowing by the second end and leads to Road.

35. a kind of protective case component for endoscope, which is characterized in that including institute according to claim 1~any one of 14 The sheath stated and according to claim 1 sheath end described in any one of 5~34, the sheath end are arranged in the sheath First end.

36. a kind of endoscopic apparatus, including endoscope assembly, the endoscope assembly includes tubular rod segments, the tubular rod segments Inside be provided with endoscope head, which is characterized in that the endoscopic apparatus further include according to claim 1~any one of 14 described in Sheath and sheath end described in any one of 5~34 according to claim 1；Wherein, the first sky that the bar portion of sheath has The second cavity that chamber and the sheath end have is used to store the tubular rod segments of the endoscope assembly, the bar portion of the sheath Inner wall and the endoscope assembly tubular rod segments outer wall by the spacer portion interval so that between two neighboring spacer portion Form first gas flow passage.

37. a kind of method of the clarity for maintaining endoscope lens, which is characterized in that described method includes following steps:

(1) endoscope assembly is provided, the endoscope assembly includes tubular rod segments, is provided with endoscope in the tubular rod segments Head；

(2) protective case component is provided, the protective case component includes the sheath end of sheath with the first end that the sheath is arranged in Head, the second cavity that the first cavity and the sheath end that the bar portion of sheath has have is for storing the endoscope assembly Tubular rod segments, the outer wall of the tubular rod segments of the inner wall of the bar portion of the sheath and the endoscope assembly is by between the spacer portion Every so that forming first gas flow passage between two neighboring spacer portion；The spacer portion be provided with it is multiple, at one or more Hole is provided in a spacer portion, the hole extends to form the first liquid flow passageway along the bar portion；

(3) gas stream is provided, so that gas stream reaches the distal end of the tubular rod segments by the first gas flow passage, and Flow through the outer surface of the endoscope head.

38. according to the method for claim 37, which is characterized in that the inner wall of the sheath end and the endoscope head Outer wall cooperation, forms the first cavity, and length direction of first cavity along the sheath end extends to form second gas stream Dynamic access, the second gas flow passage are connected with the first gas flow passage；The inner wall of the sheath end and The second cavity is provided between outer wall, length direction of second cavity along the sheath end extends to form second liquid stream Dynamic access, the second liquid flow passage are connected with first liquid flow passageway.

39. according to the method for claim 38, which is characterized in that the end of the sheath end has extension, described The extension that extension can stop the sheath to be stretched out from the sheath end.

40. according to the method for claim 39, which is characterized in that first cavity and second cavity prolong described Extend in extending portion, i.e., the described second gas flow passage and the second liquid flow passage extend in the extension.

41. according to the method for claim 40, which is characterized in that be arranged in the exit of the second cavity of the extension There is protrusion, the protrusion makes the size of the outlet of second cavity become smaller.

42. according to the method for claim 41, which is characterized in that the method also includes following steps: (4) provide liquid Stream, so that the liquid flow successively reaches the pipe by first liquid flow passageway and the second liquid flow passage The distal end of shape rod piece, and flow through the outer surface of the endoscope head.