Contact seal, seal assembly, and thumb drive

Abstract

The application relates to a contact seal, a sealing assembly and a card, which comprises a first sealing flange and an annular sealing body, wherein at least one first through hole is arranged on the first sealing flange, and the annular sealing body is correspondingly connected at the first through hole, and an arc-shaped sealing part is arranged on the inner side of the side wall of the annular sealing body. The contact seal has the advantages that the outer contour of the sealing part arranged on the annular sealing body is arc-shaped, when an operating instrument is inserted into the sealing part, the outer wall of the operating instrument is in linear contact sealing with the outer contour of the sealing part, the contact area between the operating instrument and the sealing part is reduced, the friction between the sealing part and the operating instrument is reduced, the operating instrument is more convenient to insert into or pull out from the sealing part, and the operation efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to a trocar structure, in particular to a contact seal, a sealing assembly and a trocar. BACKGROUND

[0002] The trocar is a commonly used tool in the abdominal surgery of a robot. During the surgery, a gas filling needle is first inserted into the abdomen of a patient, and gas is filled into the abdominal cavity to expand the space of the abdominal cavity. Then, the trocar is inserted into the abdominal cavity to form a channel for the operation, and the importance of the gas tightness is obvious in this process. In order to ensure that the gas in the abdomen of the patient does not leak during the operation, the existing trocar is provided with a sealing structure, which includes a sealing assembly for sealing when an operating instrument is used and a leakage prevention seal when no operating instrument is used. The sealing assembly includes a sealing part with a circular hole in the center, and the diameter of the circular hole is slightly smaller than the outer diameter of the instrument, so that the sealing part can be tightly fitted on the outer wall of the instrument to form a contact seal when the instrument passes through the circular hole.

[0003] Since the operating instrument needs to be repeatedly inserted or pulled out of the center circular hole during the operation, the sealing part generally tightly holds the outer wall of the operating instrument for consideration of the sealing performance, which undoubtedly increases the friction between the sealing part and the operating instrument, causing the operating instrument to be difficult to insert or pull out of the center hole, which is not conducive to the smooth passage of the operating instrument through the sealing part, and affects the efficiency of the operation. SUMMARY

[0004] Therefore, it is necessary to provide a contact seal with smaller friction between the sealing part and the operating instrument.

[0005] The present application provides a contact seal, which comprises a first sealing flange and an annular sealing body, wherein at least one first through hole is arranged on the first sealing flange, and the annular sealing body is correspondingly connected at the first through hole, and an arc-shaped sealing part is arranged on the inner side of the side wall of the annular sealing body.

[0006] In one embodiment, the side wall of the annular sealing body is recessed towards the axis of the annular sealing body, and the sealing part is arranged at the recessed position.

[0007] In one embodiment, the annular sealing body comprises an upper inclined wall inclined towards the axis of the annular sealing body and a lower inclined wall inclined away from the axis of the annular sealing body, and the sealing part is arranged between the upper inclined wall and the lower inclined wall.

[0008] In one embodiment, the wall thickness of the upper inclined wall and the lower inclined wall gradually decreases from the end away from the axis of the annular sealing body to the end close to the axis of the annular sealing body.

[0009] In one embodiment, a plurality of ribs substantially parallel to the axis of the annular seal body are distributed along the circumferential direction on the outer side of the annular seal body.

[0010] In one embodiment, the side wall of the annular seal body is arcuately recessed towards the axis of the annular seal body.

[0011] In one embodiment, it further includes a second sealing flange located below the first sealing flange. The annular seal body is located between the first sealing flange and the second sealing flange. The second sealing flange is provided with a second perforation at a position corresponding to each first perforation. The upper end of the annular seal body is connected to the first perforation, and the lower end is connected to the second perforation.

[0012] In one embodiment, it further includes a sealing jacket that sleeves the annular seal body. The first sealing flange, the second sealing flange, the annular seal body, and the sealing jacket enclose a sealed cavity. The second sealing flange is provided with a first air inlet channel communicating with the cavity.

[0013] In one embodiment, the annular seal body is an annular airbag, and the sealing portion is provided on the inner side of the annular airbag.

[0014] In one embodiment, the annular airbag is provided with a second air inlet channel.

[0015] To solve the same problem, the present invention also provides a sealing assembly, including a lower housing, an upper cover covering the upper opening of the lower housing, and the contact seal of any of the above solutions. Among them, the contact seal is provided in the upper cover, and the upper cover is provided with a third perforation at a position corresponding to each first perforation.

[0016] In one embodiment, it further includes an anti-backflow seal provided in the lower housing, and the anti-backflow seal is located directly below the annular seal body.

[0017] In one embodiment, the anti-backflow seal includes at least two flexible seal sheets that are inclined downward towards the axis of the anti-backflow seal, and at least one sealing seam is formed at the position where adjacent two flexible seal sheets are butted.

[0018] In one embodiment, the shape formed by the sealing seam is "one", "cross", or "Y".

[0019] In one embodiment, the anti-backflow seal includes a magnetic member and a closed-hole member. The center of the magnetic member is provided with a fifth perforation whose axis coincides with the axis of the annular seal body, and the closed-hole member is adsorbed to seal the fifth perforation.

[0020] To solve the same problem, the present invention also provides a trocar, which includes a trocar tube and the sealing component of any of the above solutions. An installation hole is provided in the lower part of the lower housing, and the upper end of the trocar tube is inserted into the installation hole.

[0021] In one embodiment, an anti-backflow seal is further included and disposed inside the lower housing, and the anti-backflow seal is located directly below the annular seal.

[0022] In one embodiment, the anti-backflow seal includes at least two flexible seal sheets that are inclined downward in the axial direction of the anti-backflow seal, and at least one sealing seam is formed at the position where adjacent two flexible seal sheets are butted.

[0023] In one embodiment, the shape formed by the sealing seams is "one", "cross" or "Y".

[0024] In one embodiment, the anti-backflow seal includes a magnetic member and a closed-hole member. A fifth through hole with an axis coinciding with the axis of the annular seal is provided at the center of the magnetic member, and the closed-hole member is adsorbed to seal the fifth through hole.

[0025] For the contact seal of the present invention, since the outer contour of the sealing portion provided on the annular seal is arc-shaped, when the operating instrument is inserted into the sealing portion, the outer wall of the operating instrument and the outer contour of the sealing portion are in line-contact sealing, which is beneficial to reducing the contact area between the operating instrument and the sealing portion, thereby reducing the frictional force between the sealing portion and the operating instrument, and being more conducive to the insertion or extraction of the operating instrument from the sealing portion, improving the efficiency of surgical operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a schematic diagram of a contact seal according to an embodiment of the present invention;

[0027] Figure 2 is a schematic diagram of a contact seal according to another embodiment of the present invention;

[0028] Figure 3 is an exploded structural schematic diagram of a sealing component of a trocar according to an embodiment of the present invention;

[0029] Figure 4 is Figure 3 a sectional schematic diagram of the assembled state of the sealing component shown in the embodiment;

[0030] Figure 5 [[ID=三十九]]is an exploded schematic diagram of a sealing component of a trocar according to another embodiment of the present invention;

[0031] Figure 6 is Figure 5 a sectional schematic diagram of the assembled state of the sealing component of the trocar shown in the embodiment;

[0032] Figure 7 is a structural schematic diagram of the backflow prevention seal of an embodiment of the present application;

[0033] Figure 8 is a structural schematic diagram of the backflow prevention seal of another embodiment of the present application.

[0034] Wherein, 100, upper cover; 101, first accommodating cavity; 102, third through hole; 200, lower shell; 201, second accommodating cavity; 202, opening; 203, mounting hole; 300, stick card tube; 1, contact seal; 11, first sealing flange; 11a, first through hole; 12, annular sealing body; 12a, upper inclined wall; 12b, lower inclined wall; 13, sealing part; 14, rib; 15, second sealing flange; 15a, second through hole; 15b, first air inlet channel; 16, sealing sleeve; 17, cavity; 18, bushing; 2, backflow prevention seal; 21, flexible sealing sheet; 22, sealing seam; 23, third sealing flange; 23a, fourth through hole; 24, magnetic member; 24a, fifth through hole; 25, closed hole member. DETAILED DESCRIPTION

[0035] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the accompanying drawings. The preferred embodiments of the present application are given in the accompanying drawings. However, the present application can be realized in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided so that the disclosure of the present application can be more thoroughly and completely understood.

[0036] It should be noted that when an element is referred to as being "on" another element, it can be directly on the other element or intervening elements can also be present. When an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements can also be present. The term "vertical", "horizontal", "left", "right", and the like as used herein are used for illustration only and are not intended to be limiting. The terms "proximal" and "distal" as used herein are used as terms of reference in the field of interventional medical devices, in which "proximal" means the end that is further away from the operator during the operation, and "distal" means the end that is closer to the operator during the operation.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description herein is for describing particular embodiments only and is not intended to be limiting of the application. The use herein of the terms "including", "comprising", "having" and the like are meant to encompass the items listed thereafter as well as other items.

[0038] As shown in the figure, the contact seal of an embodiment of the application is schematically shown, which comprises a first sealing flange 11 and an annular sealing body 12, wherein the first sealing flange 11 is provided with at least one first through hole 11a, and the annular sealing body 12 is correspondingly connected at the first through hole 11a, and the inner side of the side wall of the annular sealing body 12 is provided with a sealing portion 13 with an arc-shaped outer contour, which can be a part of the side wall of the annular sealing body 12, or other structures such as annular ribs provided on the side wall of the annular sealing body 12; since the outer contour of the sealing portion 13 is arc-shaped, when the operating instrument is inserted into the sealing portion 13, the outer wall of the operating instrument is in linear contact with the outer contour of the sealing portion 13, which is beneficial to reduce the contact area between the operating instrument and the sealing portion 13, so as to reduce the friction between the sealing portion 13 and the operating instrument, and more facilitate the insertion or extraction of the operating instrument from the sealing portion 13, thereby improving the efficiency of the surgical operation. Figure 1 The side wall of the annular sealing body 12 is recessed towards the axis of the annular sealing body 12, and the sealing portion 13 is arranged at the recess; the recess can provide a deformation space for the outward expansion of the sealing portion 13, so that when the operating instrument is inserted into the sealing portion 13, the sealing portion 13 is more easily expanded outward, and more facilitates the insertion or extraction of the operating instrument from the sealing portion 13.

[0039] More specifically, the annular sealing body 12 comprises an upper inclined wall 12a inclined towards the axis of the annular sealing body 12, and a lower inclined wall 12b inclined away from the axis of the annular sealing body 12, and the sealing portion 13 is arranged between the upper inclined wall 12a and the lower inclined wall 12b; the upper inclined wall 12a and the lower inclined wall 12b can provide support for the sealing portion 13, and when the operating instrument is inserted into the sealing portion 13, the upper inclined wall 12a and the lower inclined wall 12b are pressed and swing or bend outward to reduce the resistance of the outward expansion of the sealing portion 11, and at the same time, the upper inclined wall 12a and the lower inclined wall 12b always have a tendency to restore to the original position under the action of their own restoring force, so as to enable the sealing portion 13 to always hold the operating instrument tightly, so as to ensure that the sealing portion provides good contact sealing performance; in addition, when the operating instrument moves back and forth in the sealing portion 13, the support of the upper inclined wall 12a and the lower inclined wall 12b to the sealing portion 11 can reduce the dragging effect of the operating instrument on the sealing portion 11 due to the influence of the friction force.

[0040]

[0041] ​In addition, the thickness of the upper inclined wall 12a and the lower inclined wall 12b gradually decreases from the end (distal end) far away from the axis of the annular sealing body 12 to the end (proximal end) close to the axis of the annular sealing body 12; that is, the thickness of the upper inclined wall 12a and the lower inclined wall 12b is in the shape of a "V"; the distal end of the upper inclined wall 12a is thick, which is conducive to supporting the sealing part 13 to ensure that the sealing part provides good contact sealing performance and can effectively reset to the original position after the operating instrument is removed from the sealing part 13, and the proximal end of the upper inclined wall 12a is thin, which makes the proximal end of the upper inclined wall 12a tend to be flexible, is conducive to flexible deformation, and makes the sealing part 13 more easily expand outward and can be close to the operating instrument when the operating instrument is inserted; the lower inclined wall 12b also has similar effects, which will not be described herein.

[0042] Of course, a plurality of ribs 14 substantially parallel to the axis of the annular sealing body 12 can also be distributed on the outer side of the annular sealing body 12 along the circumferential direction thereof; the ribs 14 can increase the overall rigidity of the contact sealing member 1, so as to ensure that the sealing part 13 has sufficient holding force on the penetrating operating instrument and improve the contact sealing performance of the sealing part 11; in addition, the ribs 14 can prevent the lower inclined wall 12b from being turned over together with the operating instrument during the process of removing the operating instrument from the sealing part 11.

[0043] In other embodiments, the side wall of the annular sealing body 12 is arc-shaped recessed towards the axis of the annular sealing body 12, which is preferably circular arc-shaped recessed, and can also be elliptical or parabolic recessed; since the side wall of the annular sealing body 12 is arc-shaped recessed, a part of the side wall of the annular sealing body 12 can be used as the sealing part 13, and other structural forms of sealing parts do not need to be additionally provided on the side wall of the annular sealing body 12, so as to simplify the structure of the annular sealing body 12.

[0044] As shown in Figure 2 Another contact sealing member according to an embodiment of the present application is provided, in which a second sealing flange 15 is added, the second sealing flange 15 is located at the lower part of the first sealing flange 11, the annular sealing body 12 is located between the first sealing flange 11 and the second sealing flange 15, the first sealing flange 11, the annular sealing body 12 and the second sealing flange 15 are in an integrated structure, the second sealing flange 15 is provided with a second perforation 15a at a position corresponding to each first perforation 11a, the upper end of the annular sealing body 12 is connected with the first perforation 11a, and the lower end is connected with the second perforation 15a.

[0045] More preferably, in combination with Figure 5 and Figure 6As shown, the contact seal further comprises a sealing sleeve 16, which sheaths the annular sealing body 12, so that the first sealing flange 11, the second sealing flange 15, the annular sealing body 12 and the sealing sleeve 16 form a sealed cavity 17, and the second sealing flange 15 is provided with a first air inlet channel 15b which is in communication with the cavity 17; in this structure, the contact seal can be inflated through the first air inlet channel 15b to fill the cavity 17, and the air pressure generated by the cavity 17 can be used to support the sealing part 13; at this time, the wall thickness of the annular sealing body 12 is generally thin, and the first air inlet channel 15b can be in communication with the tube (see the tube 300 of the trocar in Figure 6 the cavity of the abdomen) which is inserted into the cavity of the abdomen, so as to use the gas in the cavity of the abdomen to inflate the cavity 17, and the air pressure of the cavity 17 is substantially equal to the air pressure in the cavity of the abdomen, so as to ensure that the cavity 17 is always in a state of swelling, so as to support the sealing part 13 and ensure the contact sealing performance of the sealing part 13; in addition, when the operating instrument passes through the sealing part 13, the cavity of the abdomen is in an uninflated state, and the uninflated cavity 17 does not support or weakly supports the sealing part 13, so as to be more conducive to the operating instrument passing through the sealing part 13.

[0046] In addition, in other embodiments, the annular sealing body 12 can be arranged as an annular air bag, the sealing part 13 is arranged on the inner side of the annular air bag, and a second air inlet channel is arranged on the annular air bag, so as to simplify the structure of the contact seal.

[0047] In combination with Figures 3 to 6 As shown, in order to solve the same problem, the embodiments of the present application also introduce two types of sealing assemblies, and the common features of the two types of sealing assemblies both comprise the contact seal 1, the upper cover 100 and the lower shell 200, wherein the upper cover 100 is provided with a first accommodating cavity 101, the contact seal 1 is arranged in the first accommodating cavity 101, the lower shell 200 is provided with a second accommodating cavity 201, the upper part of the second accommodating cavity 201 is provided with an opening 202, the upper cover 100 is arranged on the opening 202, and the upper cover 100 is provided with a third perforation 102 at a position corresponding to each first perforation 11a; the sealing assembly further comprises an anti-backflow seal 2 which is arranged in the second accommodating cavity 201 of the lower shell 200 and is located directly below the annular sealing body 12.

[0048] The anti-backflow seal 2 includes at least two flexible sealing sheets 21 that are inclined downwards in the direction of the axis of the anti-backflow seal 2. At least one sealing slit 22 is formed at the joint position of two adjacent flexible sealing sheets 21. When the operating instrument passes through the anti-backflow seal 2, the operating instrument opens the sealing slit 22 and passes through the sealing slit 22. When the operating instrument is pulled out of the anti-backflow seal 2, the flexible sealing sheets 21 come together to close the sealing slit 22. At the same time, the air pressure in the puncture tube 300 also has the tendency to squeeze the flexible sealing sheets 21 and bring them together, making the sealing slit 22 tighter, thereby effectively preventing the leakage of gas in the surgical area of ​​the abdominal cavity.

[0049] Preferably, if there is one sealing seam 22, the shape formed by the sealing seam 22 can be a straight line; if there are two sealing seams 22, the shape formed by the sealing seams 22 can be a cross shape; if there are three sealing seams 22, the shape formed by the sealing seams 22 can be a Y shape. In short, a larger number of sealing seams 22 can facilitate the operation of instruments passing through the leak-proof seal 2.

[0050] like Figure 3 and Figure 4 As shown, in this type of sealing assembly, the anti-backflow seal 2 and the contact seal 1 are separate structures. This type of anti-backflow seal 2 is suitable for use with... Figure 1 The contact seal 1 of the type shown is assembled, therefore, as Figure 7 As shown, the anti-backflow seal 2 also includes a third sealing flange 23. The third sealing flange 23 has a fourth through hole 23a at the position corresponding to the first through hole 11a. The flexible sheet 21 is connected to the edge of the fourth through hole 23a. When assembling the sealing assembly, a bushing 18 is also required between the first sealing flange 11 and the third sealing flange 23. The bushing 18 completely covers the annular sealing body 12 to provide axial support and prevent the annular sealing body 12 from being crushed.

[0051] like Figure 5 and Figure 6 As shown, in this type of sealing assembly, the anti-backflow seal 2 and the contact seal 1 are integrally structured. This type of anti-backflow seal 2 is suitable for use with… Figure 2 Assemble the contact seal 1 of the type shown, as follows: Figure 2 As shown, the flexible sealing sheet 21 is directly connected to the edge of the second perforation 15a of the second sealing flange 15.

[0052] like Figure 8 As shown, another type of anti-backflow seal 2 is disclosed in this embodiment of the invention. The anti-backflow seal 2 includes a magnetic element 24 and a closed-hole element 25. The center of the magnetic element 24 is provided with a fifth through hole 24a whose axis coincides with the axis of the annular seal body 12. The closed-hole element 24 is attracted and sealed to the fifth through hole 24a.

[0053] Since the fifth through hole 24a is arranged at the center of the magnetic member 24, according to the magnetic line distribution of the magnetic member 24, the magnetic attraction force at the position of the fifth through hole 24a is the largest, thus the closed hole member 25 always has a tendency to move to the position of the fifth through hole 24a, when the operating instrument passes through the fifth through hole 24a, the closed hole member 25 is pushed by the operating instrument to one side of the fifth through hole 24a, and when the operating instrument is pulled out of the fifth through hole 24a, the closed hole member 25 is quickly returned to the fifth through hole 24a due to the large magnetic attraction force at the fifth through hole 24a, thus the fifth through hole 24a is sealed, thereby effectively preventing the leakage of gas in the surgical area in the abdominal cavity.

[0054] In order to solve the same problem, the embodiment of the present application also provides a poke card, which comprises a poke card tube 300 and the sealing assembly of any of the above-mentioned solutions, the poke card tube 300 is detachably connected with the sealing assembly, or is permanently connected, for example, the detachable connection can be that a mounting hole 203 is arranged at the lower part of the lower shell 200, the upper end of the poke card tube 300 is inserted into the mounting hole 203, and an annular sealing ring can be arranged on the outer wall of the poke card tube 300 to improve the sealing performance of the connection between the poke card tube 300 and the mounting hole 203, this connection mode can be applied to the case that the material of the poke card tube 300 is different from the material of the lower shell, for example, the poke card tube 300 is a metal tube, in order to be able to be reused, this connection mode can be considered; the lower shell 200 and the poke card tube 300 can also be integrally formed to realize permanent connection, thereby the structure of the poke card can be simplified, and this connection mode is suitable for the use of disposable poke cards.

[0055] The technical features of the above-mentioned embodiments can be combined arbitrarily, in order to make the description simple, all possible combinations of the technical features in the above-mentioned embodiments are not described, however, as long as the combinations of the technical features do not exist contradictory, they should be considered as the scope of the present application.

[0056] The above-mentioned embodiments only express several implementation manners of the present application, the description is more specific and detailed, but it should not be understood as the limitation of the patent scope of the present application. It should be pointed out that, for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A seal assembly characterized by, The sealing assembly comprises a lower housing, an upper cover arranged on an upper opening of the lower housing, and a contact sealing element arranged in the upper cover; the contact sealing element comprises a first sealing flange and an annular sealing body, wherein at least one first through hole is arranged on the first sealing flange, and the annular sealing body is correspondingly connected at the first through hole; an arc-shaped sealing portion is arranged on the inner side of the side wall of the annular sealing body; further comprising a second sealing flange arranged at the lower part of the first sealing flange, the annular sealing body is arranged between the first sealing flange and the second sealing flange, the second sealing flange is provided with a second through hole at a position corresponding to each first through hole, the upper end of the annular sealing body is connected with the first through hole, and the lower end of the annular sealing body is connected with the second through hole; the second sealing flange is provided with an anti-backflow sealing element below the annular sealing body; the first through hole and the second through hole are configured to pass through an operating instrument; the sealing portion is configured to form a seal with the outer wall of the operating instrument when the operating instrument is inserted through the first through hole; the anti-backflow sealing element is configured to form a seal when the operating instrument is pulled out.

2. The seal assembly of claim 1, wherein, The side wall of the annular sealing body is recessed towards the axis of the annular sealing body, and the sealing portion is arranged at the recessed position.

3. The seal assembly of claim 2, wherein, The annular sealing body comprises an upper inclined wall inclined towards the axis of the annular sealing body and a lower inclined wall inclined away from the axis of the annular sealing body, and the sealing portion is arranged between the upper inclined wall and the lower inclined wall.

4. The seal assembly of claim 3, wherein, The wall thickness of the upper inclined wall and the lower inclined wall gradually decreases from one end away from the axis of the annular sealing body to one end close to the axis of the annular sealing body.

5. The seal assembly of claim 3 or 4, wherein, The outer side of the annular sealing body is provided with a plurality of ribs substantially parallel to the axis of the annular sealing body in the circumferential direction.

6. The seal assembly of claim 2, wherein, The side wall of the annular sealing body is arc-shaped recessed towards the axis of the annular sealing body.

7. The seal assembly of claim 1, wherein, Further comprising a sealing jacket, the sealing jacket covers the annular sealing body, the first sealing flange, the second sealing flange, the annular sealing body and the sealing jacket form a sealed cavity, and the second sealing flange is provided with a first air inlet channel in communication with the cavity.

8. The seal assembly of claim 1, wherein, The annular sealing body is an annular air bag, and the sealing portion is arranged on the inner side of the annular air bag.

9. The seal assembly of claim 8, wherein, The annular air bag is provided with a second air inlet channel.

10. The seal assembly of claim 1, wherein, The upper cover is provided with a third through hole at a position corresponding to each first through hole.

11. The seal assembly of claim 1, wherein, The anti-backflow sealing element is located directly below the annular sealing body.

12. The seal assembly of claim 1, wherein, The anti-backflow sealing element comprises at least two flexible sealing pieces inclined downwardly towards the axis of the anti-backflow sealing element, and at least one sealing seam is formed at the abutting position of the two adjacent flexible sealing pieces.

13. The seal assembly of claim 12, wherein, The sealing seam forms a "one” shape, a "ten” shape or a "Y” shape.

14. The seal assembly of claim 11, wherein, The anti-backflow sealing element comprises a magnetic element and a closed hole element, the center of the magnetic element is provided with a fifth through hole with an axis coinciding with the axis of the annular sealing body, and the closed hole element is adsorbed and sealed to the fifth through hole.

15. A postcard, characterized in that The sealing assembly comprises a lower housing, an upper cover arranged on an upper opening of the lower housing, and a contact sealing element arranged in the upper cover; the contact sealing element comprises a first sealing flange and an annular sealing body, wherein at least one first through hole is arranged on the first sealing flange, and the annular sealing body is correspondingly connected at the first through hole; an arc-shaped sealing portion is arranged on the inner side of the side wall of the annular sealing body; further comprising a second sealing flange arranged at the lower part of the first sealing flange, the annular sealing body is arranged between the first sealing flange and the second sealing flange, the second sealing flange is provided with a second through hole at a position corresponding to each first through hole, the upper end of the annular sealing body is connected with the first through hole, and the lower end of the annular sealing body is connected with the second through hole; the second sealing flange is provided with an anti-backflow sealing element below the annular sealing body; the first through hole and the second through hole are configured to pass through an operating instrument; 16. The sticker of claim 15, wherein, The backflow prevention seal comprises a magnetic part and a closed hole part, the center of the magnetic part is provided with a fifth through hole, the axis of the fifth through hole coincides with the axis of the annular seal body, and the closed hole part is adsorbed to seal the fifth through hole.

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