Uterine cavity endoscope sealing device

Abstract

The utility model provides a sealing device for a uterine cavity endoscope. The sealing device comprises a plug seat and an automatic check valve, a through hole extending in the first direction is formed in the middle of the plug seat. The automatic check valve is connected to the end face of one side of the plug seat, and an opening which is opened and automatically closed in the first direction is formed in the automatic check valve; the arrangement position of the opening is matched with the arrangement position of the through hole in the plug seat, so that the opening and the through hole in the plug seat are communicated with each other when the instrument tube is placed in so as to form a channel for the instrument tube to penetrate through, and a sealing structure is formed at a placement opening of the instrument channel when the instrument tube is not placed in or taken out. According to the sealing device for the uterine cavity endoscope, the air tightness at the position of an instrument channel imbedding opening is improved, liquid seepage is avoided when an instrument tube is replaced or taken out, and the convenience and efficiency of instrument tube replacement operation are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of medical instruments, in particular to a hysteroscopic sealing device. Background Art

[0002] As a commonly used instrument in minimally invasive uterine surgery, the hysteroscope is equipped with a corresponding lighting system and optical imaging system, as well as a fluid inlet and outlet system for injecting and discharging uterine distension fluid into the uterine cavity. In addition, during uterine surgery, it is also necessary to use medical instruments such as soft scissors to perform surgical operations in the uterine cavity.

[0003] For ease of operation, an instrument channel is provided in the existing hysteroendoscopy, which is used to selectively insert surgical instruments or drainage tubes and other instrument pipes according to actual needs. For example, China's domestic patent CN202022668331.6 discloses a hysteroendoscopy and endoscopic treatment system, which uses an overflow tube inserted into the instrument channel to achieve the discharge of the fluid in the uterine cavity, or inserts an internal treatment instrument into the instrument channel to achieve surgical operations. Based on this, a sealing device will be installed at the inlet of the instrument channel accordingly, such as a silicone sealing sleeve at the inlet, which can prevent the leakage of fluid in the uterine cavity during the drainage process or the operation, so that the instrument channel can achieve a sealing effect.

[0004] However, in this type of hysteroscope with an instrument channel, the sealing device can achieve a good sealing effect when the instrument tube is inserted, but when the instrument tube is taken out or replaced, the fluid in the uterine cavity will seep out from the insertion port of the sealing device, resulting in inconvenient operation and easy contamination. Utility Model Content

[0005] In view of the shortcomings of the prior art described above, the purpose of the utility model is to provide a hysteroscope sealing device for solving the problem that, when the instrument tube of the existing hysteroscope is not inserted or replaced, the air tightness of the sealing device is reduced, causing liquid to seep out of the sealing device, resulting in inconvenient operation and easy contamination.

[0006] In order to achieve the above-mentioned purpose and other related purposes, the utility model provides a hysteroscopic sealing device, which is assembled at the entrance of an instrument channel, wherein the instrument channel is used for inserting an instrument tube; the sealing device comprises:

[0007] A plug seat, wherein a through hole extending in a first direction is provided in the middle thereof, and the size of the through hole is not larger than the radial size of the instrument tube;

[0008] An automatic check valve connected to one side end face of the plug seat; the automatic check valve includes a one-way valve body, in which is provided an opening which opens and automatically closes along the first direction; the setting position of the opening matches the setting position of the through hole in the plug seat, so that the opening and the through hole on the plug seat are connected when the instrument tube is inserted to form a passage for the instrument tube to pass through, and the opening is automatically closed to form a sealing structure when the instrument tube is not inserted or removed; wherein the plug seat and the one-way valve body are both made of elastic material; the first direction is the insertion direction of the instrument tube.

[0009] In one embodiment of the present application, the automatic check valve also includes an annular valve body base, one side of which is connected to the end face of the plug seat, and the other side is connected to the bottom of the one-way valve body; the one-way valve body includes a first valve flap and a second valve flap arranged opposite to each other; one end of the two valve flaps is connected to the valve body base, and the other side is a free end; the free ends of the two valve flaps abut against each other, forming a gap at the abutment point, which serves as the opening of the automatic check valve for the instrument tube to pass through.

[0010] In one embodiment of the present application, the first valve flap and the second valve flap have the same size along the first direction, and the sum of the radial sizes of the first valve flap and the second valve flap is adapted to the inner diameter size of the entrance of the instrument channel, so that the first valve flap and the second valve flap are respectively fitted or abutted against the inner wall of the instrument channel.

[0011] In one embodiment of the present application, the one-way valve body is an integral component, and its end away from the plug seat is a free end face; the free end face is provided with a slot for the instrument tube to pass through; the setting position of the slot is adapted to the setting position of the through hole to form a channel for the instrument tube to pass through.

[0012] In one embodiment of the present application, the one-way valve body includes a duckbill valve body, the top of which is a free end face; a slot is provided on the free end face, serving as the opening for the instrument tube to pass through; the setting position of the slot is adapted to the setting position of the through hole to form a channel for the instrument tube to pass through; the free end face is formed with a first docking portion and a second docking portion on both sides of the slot, and when the instrument tube is not inserted or removed, the first docking portion and the second docking portion abut against each other under the pressure of the uterine cavity fluid to form a sealing structure.

[0013] In one embodiment of the present application, the extension length of the insertion slot is not greater than the diameter of the instrument tube.

[0014] In one embodiment of the present application, the duckbill valve body further includes a first pressure-bearing portion and a second pressure-bearing portion for bearing the pressure of the liquid in the uterine cavity; the first pressure-bearing portion and the second pressure-bearing portion are a group of inclined side walls arranged opposite to each other and converged toward the top of the valve body; the first pressure-bearing portion and the second pressure-bearing portion are respectively connected to the free end surface to form a first edge and a second edge correspondingly; the first edge and the second edge are both extended in parallel and parallel to the extension direction of the insertion slit.

[0015] In one embodiment of the present application, the extension lengths of the first edge and the second edge are the same and are not less than the extension length of the insertion slot.

[0016] In one embodiment of the present application, the first pressure-bearing portion and the second pressure-bearing portion are both flat inclined side walls, and the inclination angles of the two are the same; wherein the inclination angle is the inclination angle between the inclined surface where the first pressure-bearing portion or the second pressure-bearing portion is located and the central axis surfaces of the two.

[0017] In one embodiment of the present application, the automatic check valve also includes an annular valve body base, one side of which is connected to the end face of the plug seat, and the other side is connected to the bottom of the one-way valve body; the radial dimension of the valve body base is the same as the radial dimension of the plug seat.

[0018] In one embodiment of the present application, the radial dimension of the plug seat is matched with the inner diameter dimension of the instrument channel entrance, so that when the sealing device is assembled in the instrument channel, the outer wall of the plug seat abuts against the inner wall of the instrument channel.

[0019] As described above, the hysteroscopic sealing device provided by the utility model is provided with a plug seat and an automatic check valve made of elastic material, a through hole adapted to the diameter of the instrument tube is provided in the plug seat, and an opening that opens and automatically closes along the first direction is provided in the valve body of the automatic check valve. Based on the mutual connection between the plug seat and the automatic check valve, a channel running through the through hole and the opening is formed, so that the instrument tube can pass through the channel and be inserted into the instrument channel, and when the instrument tube is taken out or not inserted, the opening can be automatically closed, which greatly improves the air tightness at the entrance of the instrument channel, avoids liquid seepage when the instrument tube is replaced or taken out, and reduces liquid contamination while greatly improving the convenience and efficiency of the instrument tube replacement operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Shown is a schematic diagram of the assembly of the hysteroscopic sealing device in one embodiment of the utility model

[0021] Figure 2 The figure shows a cross-sectional view of the sealing device in one embodiment of the present invention in a front view;

[0022] Figure 3 Shown is a schematic structural diagram of a sealing device in one embodiment of the utility model from a left perspective;

[0023] Figure 4 Shown is a schematic structural diagram of a sealing device in one embodiment of the utility model from a right perspective;

[0024] Figure 5 Shown is a structural schematic diagram of an embodiment of the automatic check valve described in the utility model;

[0025] Figure 6 It is a schematic structural diagram of another embodiment of the automatic check valve of the utility model;

[0026] Figure 7 Shown is a three-dimensional diagram of another embodiment of the automatic check valve of the present invention. DETAILED DESCRIPTION

[0027] The following describes the implementation of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0028] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and thus the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed at will, and the component layout may also be more complicated.

[0029] It should be noted that when a component is referred to as being "connected" to another component, it may be directly connected to the other component or there may be a central component. When a component is referred to as being "disposed on" another component, it may be directly disposed on the other component or there may be a central component at the same time.

[0030] In order to solve the problem that the air tightness of the existing hysteroscopic endoscope sealing device is reduced when the instrument tube is not inserted or replaced, causing liquid to easily seep out of the sealing device, the embodiment of the utility model provides a new hysteroscopic endoscope sealing device, which is adapted to the instrument channel inside the hysteroscopic endoscope. When the instrument tube is not inserted or replaced, the liquid in the uterine cavity can be prevented from seeping out of the sealing device, thereby improving the sealing of the instrument channel insertion port in the hysteroscopic endoscope.

[0031] Wherein, the instrument channel is a channel provided inside the hysteroscopic endoscope and passing through the hysteroscopic endoscope, and is used for inserting the instrument tube;

[0032] The instrument tube includes surgical instruments, drainage tubes or other existing uterine cavity operation instruments.

[0033] See also Figure 1 , is a schematic diagram of the assembly of the hysteroscopic sealing device provided in the present application in one embodiment. Figure 1 As shown, the hysteroscopic sealing device 100 is assembled at the entrance 210 of the internal instrument channel 200 of the hysteroscopic endoscope.

[0034] The insertion port of the instrument channel is an insertion port in the instrument channel for inserting an instrument tube such as a surgical instrument or a mirror tube.

[0035] See also Figures 2 to 4 As shown, the structural schematic diagrams of the hysteroscopic sealing device (hereinafter referred to as "sealing device") provided by the present application in one embodiment are respectively shown (under different viewing angles); wherein, Figure 2 is a cross-sectional view of the sealing device at a frontal perspective, Figure 3 and Figure 4 Corresponding to the structural diagram of the sealing device under left and right viewing angles.

[0036] like Figures 2 to 4 As shown, the sealing device 10 includes: a plug seat 110 and an automatic check valve 120 connected to the plug seat 110, and the plug seat 110 and the automatic check valve 120 are both made of elastic materials; illustratively, the elastic material includes silicone or rubber.

[0037] A through hole 111 extending along a first direction is provided in the middle of the plug seat 110 for inserting an instrument tube; the size of the through hole 111 is not larger than the radial size of the instrument tube, and when the instrument tube passes through the through hole 111, the outer wall of the instrument tube abuts against the through hole 111 to form a first seal.

[0038] Wherein, the first direction is the insertion direction of the instrument tube, that is, Figure 2 The X-axis direction.

[0039] The automatic check valve 120 is connected to one side end face of the plug seat 110, and its radial dimension is adapted to the inner diameter dimension of the instrument channel insertion entrance; the automatic check valve 120 comprises a one-way valve body 121, and the one-way valve body 121 is provided with an opening 1211 along the first direction; the setting position of the opening 1211 matches the setting position of the through hole 111 in the plug seat, and the opening 1211 and the through hole 111 on the plug seat are interconnected to form a channel for the instrument tube to pass through; the opening is opened by force when the instrument tube is inserted to allow the instrument tube to pass through; the opening is automatically closed by force when the instrument tube is not inserted or removed to form a second seal.

[0040] In a specific embodiment, a cavity 1212 is provided inside the one-way valve body 121 , and the cavity 1212 communicates with the opening 1211 and the through hole 111 to achieve communication between the opening 1211 and the through hole 111 .

[0041] The hysteroscopic sealing device provided in the present embodiment is provided with a plug seat and an automatic check valve connected to the plug seat, a through hole adapted to the diameter of the instrument tube is provided in the plug seat, and an opening which can be opened and automatically closed along the first direction is provided in the automatic check valve, so that a passage passing through the through hole and the opening is formed when the opening is opened, so that the instrument tube can pass through the passage and be inserted into the instrument channel, and when the instrument tube is taken out or not inserted, the opening can be automatically closed to form a sealing structure at the instrument channel insertion entrance, thereby greatly improving the air tightness at the instrument channel insertion entrance, avoiding liquid seepage when the instrument tube is replaced or taken out, and reducing liquid contamination while greatly improving the convenience and efficiency of the instrument tube replacement operation.

[0042] In a specific embodiment, the automatic check valve is as follows Figure 5 The one-way valve body 121 and the valve body base 122 are included.

[0043] The valve body base 122 is annular, one side of which is connected to the end surface of the plug seat 110 , and the other side of which is connected to the bottom of the one-way valve body 121 .

[0044] The one-way valve body 121 includes a first valve flap 1213 and a second valve flap 1214 which are arranged opposite to each other; one end of the two valve flaps is connected to the valve body base 122, and the other side has a free end; the free ends of the two valve flaps abut against each other, forming a slot 1211 at the abutment point, which serves as the opening of the automatic check valve 120 for the instrument tube to pass through.

[0045] Specifically, the thickness dimension of the first valve flap 1213 and the second valve flap 1214 along the first direction is the same, and the sum of the radial dimensions of the first valve flap 1213 and the second valve flap 1214 along the same direction is equal to or slightly larger than the inner diameter dimension of the instrument channel at the insertion entrance, so that the first valve flap 1213 and the second valve flap 1214 are respectively fitted or abutted against the inner wall of the instrument channel; when the instrument tube is inserted, the first valve flap and the second valve flap are squeezed and deformed by the instrument tube, so that the insertion gap between the two valve flaps becomes wider to allow the instrument tube to pass through the insertion gap; when the instrument tube is not inserted or removed, the first valve flap and the second valve flap are re-abutted at the insertion gap under the combined action of elastic reset and the limiting action of the inner wall of the instrument channel to form a second seal to prevent liquid from seeping out of the insertion gap.

[0046] The sealing device provided in this embodiment is provided with a first valve flap and a second valve flap having elasticity in the one-way valve body, and the first valve flap and the second valve flap are respectively fitted or abutted against the inner wall of the instrument channel, so that when the instrument tube is not inserted or removed, the first valve flap and the second valve flap can be re-abutted at the insertion gap based on the combined effect of their own elastic reset effect and the limiting effect of the inner wall of the instrument channel to form a second seal.

[0047] It should be noted that, in some other embodiments, the one-way valve body can also be an integral component, that is, the first valve flap and the second valve flap are connected to form an integral structure, and the one-way valve body is a free end face away from the plug seat end, and a slot is provided on the one-way valve body for the instrument tube to pass through; the setting position of the slot is adapted to the setting position of the through hole to form a channel for the instrument tube to pass through.

[0048] In an optional embodiment, the automatic check valve is as follows Figure 6 and Figure 7 As shown, it includes a duckbill valve body, whose radial dimension is no greater than the inner diameter of the instrument channel at the inlet.

[0049] The top of the duckbill valve body (far away from the end of the plug seat) is a free end surface 1215; a slot 1211 for the instrument tube to pass through is formed on the free end surface 1215; the setting position of the slot 1211 is adapted to the setting position of the through hole to form a channel for the instrument tube to pass through.

[0050] The duckbill valve body also includes a first pressure-bearing portion 1217 and a second pressure-bearing portion 1218 for bearing the fluid pressure in the uterine cavity; the first pressure-bearing portion 1217 and the second pressure-bearing portion 1218 are arranged between the base and the top, and are a group of inclined side walls arranged opposite to each other and converged toward the top, that is, they are both inclined from the bottom of the duckbill valve body to the top; the first pressure-bearing portion 1217 and the second pressure-bearing portion 1218 are respectively connected to the free end surface 1215, correspondingly forming a first edge 1215A and a second edge 1215B, both of which are arranged in parallel and parallel to the extension direction of the insertion slit 1211.

[0051] The free end surface is formed with a first docking portion 1215C and a second docking portion 1215D on both sides of the insertion slot 1211; the first docking portion 1215C and the second docking portion 1215D are free end surface sub-areas that are parallel to the insertion slot 1212 and located within a preset range on one side of the insertion slot 1211; when the instrument tube is not inserted or removed, the first docking portion 1215C and the second docking portion 1215D abut against each other to form a second seal.

[0052] Specifically, when the instrument tube is taken out of the instrument channel, the free ends of the first docking portion 1215C and the second docking portion 1215D abut against each other under the action of the elastic restoring force; at the same time, based on the liquid pressure of the intrauterine liquid borne by the first pressure-bearing portion and the second pressure-bearing portion, a group of mutually squeezing forces are respectively formed at the first docking portion and the second docking portion on both sides of the insertion seam, that is, a downward force is formed in the first docking portion (the docking portion located above the insertion seam), and an upward force is formed in the second docking portion (the docking portion located below the insertion seam); under the joint action of the group of forces and the elastic restoring force, the first docking portion and the second docking portion further enhance the airtightness of the second seal to prevent liquid from seeping out of the insertion seam.

[0053] In a preferred embodiment, both the first pressure-bearing portion and the second pressure-bearing portion are flat inclined side walls, and the inclination angles of the two are the same, so that the pressures borne by the two pressure-bearing surfaces are the same or similar.

[0054] Among them, the inclination angle is the angle between the inclined plane where the first pressure-bearing part or the second pressure-bearing part is located and the central axis plane; the central axis plane is the central axis plane between the inclined plane where the first pressure-bearing part is located and the inclined plane where the second pressure-bearing part is located.

[0055] In a more specific embodiment, the inclination angle is any angle between 20 degrees and 80 degrees; preferably, the inclination angle is 45 degrees.

[0056] In a preferred embodiment, the radial dimension of the valve body base is the same as the radial dimension of the plug seat, so that the automatic check valve and the plug seat can be aligned with each other when connected, so that the center points of the through hole and the insertion slot are aligned with each other.

[0057] In a preferred embodiment, the extension lengths of the first edge and the second edge are the same and not less than the extension length of the insertion slit, so that the bearing surface of the first pressure-bearing portion and the second pressure-bearing portion that can bear the liquid pressure is larger, so that the first pressure-bearing portion and the second pressure-bearing portion can bear the liquid pressure more fully, thereby increasing the abutting force between the first butt joint portion and the second butt joint portion.

[0058] In an optional embodiment, the extension length of the insertion slit is slightly smaller than the diameter of the instrument tube, so that when the instrument tube is inserted, the side wall of the insertion slit abuts against the instrument tube, thereby improving the air tightness between the duckbill valve body and the instrument tube and reducing the leakage of liquid in the gap between the valve body and the instrument tube.

[0059] In a specific embodiment, the radial dimension of the plug seat 110 is matched with the inner diameter dimension of the instrument channel entrance, so that when the sealing device is assembled in the instrument channel, the outer wall of the plug seat abuts against the inner wall of the instrument channel to form a third seal.

[0060] In an optional embodiment, the cross-sectional shape of the plug seat along the second direction is the same as the cross-sectional shape of the instrument channel along the second direction, that is, when the cross-section of the instrument channel is circular, the cross-section of the plug seat is also circular; wherein the second direction is a direction perpendicular to the first direction.

[0061] It should be noted that, in other embodiments, the plug seat and the automatic check valve are integrally formed and are both made of elastic material.

[0062] The sealing device provided in this embodiment provides a duckbill valve body and inclined pressure-bearing parts on both sides of the valve body, thereby diverting the liquid in the uterine cavity to both sides of the valve body, so as to form a relative squeezing force at the opening of the valve body based on the liquid pressure borne by the pressure-bearing parts on both sides; through the mutual superposition of the squeezing force and the elastic restoring force, the airtightness at the opening of the valve body is enhanced, thereby further improving the airtightness of the sealing device, avoiding the leakage of liquid at the insertion entrance of the instrument channel when the instrument tube is not inserted into the instrument channel or when the instrument tube is replaced, thereby greatly improving the flexibility of instrument tube replacement and operation.

[0063] The technical features of the above-mentioned embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification. When the technical features in different embodiments are embodied in the same figure, it can be regarded that the figure also discloses the combination examples of the various embodiments involved.

[0064] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed in the present invention shall still be covered by the claims of the present invention.

Claims

1. A hysteroscopic sealing device, characterized in that: Assembled at the entrance of the instrument channel, wherein the instrument channel is for the instrument tube to be inserted; the sealing device comprises: A plug seat, wherein a through hole extending in a first direction is provided in the middle thereof, and the size of the through hole is not larger than the radial size of the instrument tube; An automatic check valve connected to one side end surface of the plug seat; the automatic check valve comprises a one-way valve body, in which an opening is provided that opens and automatically closes along the first direction; the setting position of the opening matches the setting position of the through hole in the plug seat, so that the opening and the through hole on the plug seat are connected when the instrument tube is inserted to form a passage for the instrument tube to pass through, and when the instrument tube is not inserted or removed, the opening is automatically closed to form a sealing structure; Wherein, the plug seat and the one-way valve body are both made of elastic material; the first direction is the insertion direction of the instrument tube.

2. The hysteroscopic sealing device according to claim 1, characterized in that: The one-way valve body comprises a first valve flap and a second valve flap which are arranged opposite to each other; the free ends of the two valve flaps abut against each other, and a slot is formed at the abutting position, which serves as an opening of the automatic check valve for the instrument tube to pass through.

3. The hysteroscopic sealing device according to claim 2, characterized in that: The first valve flap and the second valve flap have the same size along the first direction, and the sum of the radial sizes of the first valve flap and the second valve flap is matched with the inner diameter size of the inlet of the instrument channel, so that the first valve flap and the second valve flap are respectively fitted or abutted against the inner wall of the instrument channel.

4. The hysteroscopic sealing device according to claim 1, characterized in that: The one-way valve body is an integral component, and its end away from the plug seat is a free end face; the free end face is provided with a slot for the instrument tube to pass through; the setting position of the slot is matched with the setting position of the through hole to form a channel for the instrument tube to pass through.

5. The hysteroscopic sealing device according to claim 1, characterized in that: The one-way valve body comprises a duckbill valve body, the top of which is a free end surface; the free end surface is provided with an insertion slot as the opening for the instrument tube to pass through; the setting position of the insertion slot is adapted to the setting position of the through hole to form a passage for the instrument tube to pass through; The free end surface forms a first docking portion and a second docking portion on both sides of the insertion slot. When the instrument tube is not inserted or removed, the first docking portion and the second docking portion abut against each other under the pressure of the uterine cavity fluid to form a sealing structure.

6. The hysteroscopic sealing device according to claim 5, characterized in that: The extension length of the insertion slot is not greater than the diameter of the instrument tube.

7. The hysteroscopic sealing device according to claim 5, characterized in that: The duckbill valve body further comprises a first pressure-bearing portion and a second pressure-bearing portion for bearing the pressure of the fluid in the uterine cavity; the first pressure-bearing portion and the second pressure-bearing portion are a set of inclined side walls arranged opposite to each other and converging toward the top of the valve body; The first pressure-bearing portion and the second pressure-bearing portion are respectively connected to the free end surface to form a first edge and a second edge correspondingly; the first edge and the second edge are both parallel to each other and parallel to the extension direction of the insertion slit.

8. The hysteroscopic sealing device according to claim 7, characterized in that: The extension lengths of the first edge and the second edge are the same and not less than the extension length of the insertion slit.

9. The hysteroscopic sealing device according to claim 7, characterized in that: The first pressure-bearing portion and the second pressure-bearing portion are both flat inclined side walls, and the inclination angles of the two are the same; The inclination angle is the angle between the inclined surface where the first pressure-bearing part or the second pressure-bearing part is located and the mid-axis surface of the two.

10. The hysteroscopic sealing device according to claim 1, characterized in that: The automatic check valve also includes an annular valve body base, one side of which is connected to the end surface of the plug seat and the other side is connected to the bottom of the one-way valve body; the radial dimension of the valve body base is the same as the radial dimension of the plug seat.

11. The hysteroscopic sealing device according to claim 1, characterized in that: The radial dimension of the plug seat is matched with the inner diameter dimension of the inlet of the instrument channel, so that when the sealing device is assembled in the instrument channel, the outer wall of the plug seat abuts against the inner wall of the instrument channel.

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