Digestive endoscope biopsy duct soft plug

Abstract

The utility model discloses a digestive endoscopy biopsy duct soft plug which comprises a tubular soft plug body, a center channel is arranged in the soft plug body, the upper end of the soft plug body extends outwards in the radial direction to form a turnup edge, a valve block used for opening or closing the center channel is arranged in the center channel of the soft plug body, and the valve block is arranged in the center channel of the soft plug body. The valve plate is composed of at least three thin sheets which are evenly distributed in the circumferential direction, the thin sheets are fixed to the soft plug body, any two adjacent thin sheets are oppositely combined to form an attaching seam, and the thin sheets are bent inwards in the axial direction so that the valve plate formed by all the thin sheets can be of an inwards-concave arc-shaped structure. The utility model provides a soft plug for a biopsy pore channel of a digestive endoscope, which does not need to be taken down when related instruments of the digestive endoscope need to penetrate into the biopsy pore channel, so that the actions of taking down and assembling the soft plug are reduced, the biopsy pore channel is more convenient to use, and meanwhile, the sealing performance of the biopsy pore channel can be kept when the biopsy pore channel is not used.

Description

Technical Field

[0001] This utility model relates to the technical field of accessories related to digestive endoscopes, specifically a soft plug for biopsy channels in digestive endoscopes. Background Technology

[0002] A digestive endoscope is a set of devices that acquire images directly through the digestive tract or via ultrasound and X-ray equipment to diagnose and treat digestive system diseases. Digestive endoscopes have a biopsy channel; the lower opening of the biopsy channel is located at the front of the endoscope, and the upper opening is located on the endoscopist's handheld device. Current digestive endoscopes are generally equipped with a plug to seal the upper opening of the biopsy channel. The plug is opened when surgical instruments such as forceps or snares need to be inserted into the biopsy channel, and the plug is resealed after the instruments are removed to prevent the reflux of liquids or gases from the patient's digestive tract.

[0003] However, in actual practice, doctors need to remove and reinstall the stopper every time they use the biopsy channel, which obviously causes inconvenience for doctors using the biopsy channel. Utility Model Content

[0004] The present invention aims to at least partially solve one of the technical problems in the related art: to provide a soft plug for biopsy channels in digestive endoscopy, which does not need to be removed when digestive endoscopy instruments need to be inserted into the biopsy channel, thereby reducing the action of removing and installing the soft plug, making the use of the biopsy channel more convenient, and at the same time maintaining the sealing of the biopsy channel when it is not in use.

[0005] Therefore, one objective of this utility model is to provide a soft plug for biopsy channels in digestive endoscopy, comprising a tubular soft plug body with a central channel. The upper end of the soft plug body extends radially outward to form a flange, and a valve plate for opening or closing the central channel is provided in the central channel of the soft plug body. The valve plate is composed of at least three thin plates evenly arranged circumferentially. The thin plates are fixed to the soft plug body, and any two adjacent thin plates are mated to form a fitting seam. The thin plates are bent axially inward so that the valve plate composed of all the thin plates has an inwardly concave arc-shaped structure. The thin sheet is made of elastic material, so instruments used in gastrointestinal endoscopy, such as forceps and snares, can directly push open the valve and extend into the biopsy channel. This eliminates the need to remove and reinstall the soft plug, making it convenient for endoscopy staff to use the biopsy channel when needed. At the same time, when removing instruments such as forceps and snares, the multiple thin sheets in the valve can come together under their own elastic restoring force to form a complete valve. The valve then covers the central channel again, achieving a seal for the biopsy channel.

[0006] According to one example of this utility model, there are three sheets.

[0007] According to one example of the present invention, the projection of the sheet on the horizontal plane is fan-shaped, and the rear end of the sheet is an integral structure with the soft plug body.

[0008] According to one example of this utility model, the inner wall of the central channel is incised into a conical surface. The diameter d1 of the upper end of the conical surface is larger than the diameter d2 of the lower end of the conical surface, and the upper end of the conical surface extends to the connection between the valve plate and the soft plug body. This conical surface design ensures that when the thin plate is subjected to external force and flips inward, it adheres to the conical surface, preventing it from becoming embedded between the inner wall of the central channel and the outer wall of the external instrument, thus avoiding increased frictional resistance, especially when the outer diameter of the external instrument is approximately the same as the inner diameter of the central channel.

[0009] According to one example of the present invention, the upper end of the conical surface is transitionally connected to the inner surface of the valve plate through an arc surface, and the lower end of the conical surface is transitionally connected to the inner wall of the central channel.

[0010] According to one example of this utility model, the soft plug body has an annular clearance cavity surrounding the valve plate, and a thin-walled structure is formed between the annular clearance cavity and the arcuate surface. This annular clearance cavity allows the connection between the thin plate and the soft plug body to move into the annular clearance cavity as the thin plate is moved towards the central channel by external instruments. This reduces resistance when the thin plate moves inward. When there is backflow pressure in the biopsy channel, and this pressure is applied to the thin plate from the inside out through the central channel, the tension of the thin wall between the annular clearance cavity and the arcuate surface, as well as the concave arcuate structure of the valve plate, allows the valve plate to maintain a better seal when subjected to the outward pressure.

[0011] According to one example of the present invention, the soft plug body is made of rubber.

[0012] According to one example of this invention, the outer surface of the sheet has a smooth layer, the surface friction coefficient of which is less than that of the inner surface of the sheet. This smooth layer can be applied to the outer surface of the sheet by spraying, which not only does not affect the bending and tensile deformation of the sheet, but also allows the outer surface of the sheet to contact the external instrument through the smooth layer when the external instrument is inserted into the central channel and pushes open the sheets, resulting in low friction.

[0013] According to one example of this invention, the outer surface of the sheet has outwardly protruding ridges that extend radially inward along the central channel to form a strip-shaped structure. When an external instrument is inserted into the central channel and pushes open each sheet, the ridges on the outer surface of the sheet contact the external instrument, reducing the contact area and thus minimizing friction.

[0014] The above technical solution has the following advantages or beneficial effects: First, the soft plug can always be installed on the biopsy channel of the digestive endoscope. When the biopsy channel is needed, medical staff can directly insert the relevant external instruments. During this process, because the thin plates constituting the valve are elastic, the external instruments can directly push open the thin plates and thus extend into the biopsy channel. After the external instruments are used and removed from the biopsy channel, the thin plates in the valve can return to their initial state under the action of their own elastic restoring force, and finally re-cover and seal the central channel on the soft plug. This greatly reduces the repeated actions of medical staff to pick up and put down the soft plug during digestive endoscopy, making it more convenient. Second, because the valve is an inwardly concave arc-shaped structure, it is extremely easy for external instruments to push the thin plates from the outside in. When the pressure generated by the gas or liquid in the patient's digestive tract acts on the valve, the concave arc-shaped structure of the valve causes adjacent thin plates to squeeze against each other. This design achieves a better sealing effect. Secondly, the inner wall of the central channel is incised into a conical surface near the valve plate. This allows the thin plate to be positioned on the conical surface when it is rotated inward by the force of an external instrument. Since the conical surface is concave, the thin plate is contained within it, preventing it from embedding in the gap between the external instrument and the inner wall of the central channel, which would increase frictional resistance. This is especially important when the external instrument has a large diameter, which is equal to or slightly smaller than the endoscope in the central channel. This conical surface design allows the external instrument to pass smoothly through the soft plug. Finally, the annular clearance cavity allows the connection between the thin plate and the soft plug to deform and displace into the annular clearance cavity when the thin plate moves inward, reducing frictional resistance between the external instrument and the thin plate. When the thin plate is subjected to pressure from the inside out, the thin wall between the annular clearance cavity and the arc surface can hold the thin plate, allowing it to withstand a larger outward force.

[0015] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0016] Figure 1 This is an axial view of the soft plug for biopsy channels in a digestive endoscope according to this utility model.

[0017] Figure 2This is a top view schematic diagram of the soft plug for biopsy channels in a digestive endoscope according to this utility model.

[0018] Figure 3 for Figure 2 A cross-sectional view along the "AA" direction.

[0019] Figure 4 This is an assembly diagram of the soft plug of this utility model installed on a digestive endoscope.

[0020] Figure 5 This is a schematic diagram of the structure of the soft plug body with a base of this utility model.

[0021] Among them, 1. Soft plug body; 2. Central channel; 3. Valve plate; 3.1 Thin sheet; 3.1.1 Inner surface; 3.1.2 Outer surface; 3.2 Fitting seam; 4. Conical surface; 5. Arc surface; 6. Annular relief cavity; 7. Flanged edge; 8. Digestive endoscope; 8.1 Biopsy channel; 9. Base; 10. Connecting strap. Detailed Implementation

[0022] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0023] The soft plug for biopsy channels in digestive endoscopes according to embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0024] like Figure 4 As shown, the existing digestive endoscope 8 includes a handheld end that can be held by medical personnel and a body connected to the handheld end. The body is a slender tubular structure and is flexible. The body has a biopsy channel 8.1 inside, the lower end of which extends to the end of the body, forming a lower opening adjacent to a camera, lamp, etc. The upper end of the biopsy channel 8.1 is located on the handheld end. During routine work, various auxiliary instruments required by the digestive endoscope 8, such as snares and forceps, are inserted through the upper opening of the biopsy channel 8.1 on the handheld end and exit through the lower opening for biopsy sampling of pathological tissues. When the biopsy channel 8.1 is not in use, it needs to be kept sealed to prevent gas, liquid, or gas-liquid mixtures from flowing back out of the patient's digestive tract under pressure. Therefore, the upper opening of the biopsy channel 8.1 on the handheld end needs to be plugged.

[0025] This invention addresses the shortcomings of existing biopsy channel plugs by proposing an embodiment of a soft plug for biopsy channels in digestive endoscopy, such as... Figure 1-3 As shown, it includes a soft plug body 1, which is configured as a tubular structure that matches the biopsy channel 8.1. The soft plug body 1 has a central channel 2, which axially penetrates the upper and lower end faces of the soft plug body 1. The upper end of the soft plug body 1 extends radially outward to form a flange 3. The central channel 2 of the soft plug body 1 is provided with a valve plate 3 for opening or closing the central channel 2. The valve plate 3 is composed of at least three thin plates 3.1 evenly arranged circumferentially. All the thin plates 3.1 can be spliced ​​together horizontally to form a circular sheet structure that matches the cross-section of the central channel 2. The ends of the thin plates 3.1 near the inner wall of the central channel 2 are fixed to the soft plug body 1, and any two adjacent thin plates 3.1 are joined to form a fitting seam 3.2. The thin plates 3.1 are bent axially inward so that the valve plate 3 formed by all the thin plates 3.1 has an inwardly concave arc-shaped structure. In this embodiment, the sheet 3.1 is made of an elastic material so that the sheet 3.1 can withstand the following conditions: Figure 3 As shown, it can bend and deform downwards when a downward force is applied.

[0026] like Figure 2 As shown, the thin sheet 3.1 is preferably three in number.

[0027] Specifically, the projection of the thin sheet 3.1 on the horizontal plane is fan-shaped. The rear end of the thin sheet 3.1 near the inner wall of the central channel 2 is fixedly connected to the inner wall of the central channel 2. Preferably, the thin sheet 3.1 and the soft plug body 1 are an integral structure.

[0028] Based on the preferred embodiments described above, such as Figure 3 As shown, the inner wall of the central channel 2 is internally tangent to form a conical surface 4. The diameter d1 of the upper end of the conical surface 4 is larger than the diameter d2 of the lower end of the conical surface 4, and the upper end of the conical surface 4 extends to the connection between the valve plate 3 and the soft plug body 1. Specifically, the inclination angle of the conical surface 4 is 5~10° and the conical surface 4 is in... Figure 3 In the longitudinal section shown, its axial length is greater than or equal to the length of the sheet 3.1 in the longitudinal section, so that the entire sheet 3.1 can fit on the conical surface 4 during the downward movement of the sheet 3.1 around the connection.

[0029] Preferably, such as Figure 3 As shown, the upper end of the conical surface 4 is connected to the inner surface 3.1.1 of the valve plate 3 via the arc surface 5, and the lower end of the conical surface 4 is connected to the inner wall of the central channel 2.

[0030] In the above embodiments, due to the presence of the conical surface 4, the thin sheet 3.1 can form a receiving space between the conical surface 4 and the outer surface of the external instrument during the insertion of the external instrument. Therefore, the thin sheet 3.1 will not be squeezed into the narrow gap between the outer wall of the external instrument and the inner wall of the central channel 2, which would increase the frictional resistance. However, since the thickness at the connection between the rear end of the thin sheet 3.1 and the soft plug body 1 is inevitably large, the elastic restoring force at the connection is large during the downward bending deformation of the thin sheet 3.1. Therefore, the resistance when the entire thin sheet 3.1 is bent downward increases. In particular, when the diameter of the external instrument is approximately the same as the inner diameter of the central channel, the large elastic restoring force at the connection of the thin sheet 3.1 will increase the frictional resistance between the thin sheet 3.1 and the external instrument, affecting the smooth passage of the external instrument. It should be understood that for endoscopic instruments, the size of the biopsy channel 8.1 is fixed, while the smaller the size of the auxiliary instruments that allow passage through the biopsy channel 8.1, the greater the manufacturing difficulty and cost. Therefore, such auxiliary instruments are often designed to be as large as possible while still allowing passage through the biopsy channel 8.1. In this case, the elastic restoring force at the connection of the thin sheet 3.1 in this embodiment is large, resulting in a large frictional resistance at the contact point between the thin sheet 3.1 and the external instrument. Therefore, the improvement in this embodiment is that the soft plug body 1 has an annular clearance cavity 6 surrounding the valve plate 3, and a thin-walled structure is formed between the annular clearance cavity 6 and the arc surface 5. Specifically, the sidewall thickness between the annular clearance cavity 6 and the arc surface 5 is less than or equal to the thickness of the thin sheet 3.1. In this embodiment, since the annular clearance cavity 6 is located on the outer side of the horizontal direction at the connection of the thin sheet 3.1, therefore... Figure 3 As shown, during the process of the thin sheet deforming downwards under external force, the connection of the thin sheet 3.1 is also subjected to downward deformation force. At this time, due to the presence of the annular relief cavity 6, the connection of the thin sheet 3.1 can deform into the annular relief cavity 6. During this process, the sidewall between the annular relief cavity 6 and the arc surface 5 also deforms synchronously. Since the wall thickness of this sidewall is relatively thin, the elastic restoring force of the entire thin sheet 3.1 during downward deformation is smaller. Therefore, the friction between the thin sheet 3.1 and the external instrument is smaller, which is conducive to the passage of the external instrument. When the external instrument is removed, the thin sheet 3.1 can return to its initial state by its own elastic restoring force without the action of external force, that is, all the thin sheets 3.1 surround and form the valve plate of the sealing central channel 2. When the valve plate is subjected to upward pressure, due to the presence of the side wall between the annular relief cavity 6 and the arc surface 5, the side wall will exert a downward pulling force on the thin plate 3.1 to resist the upward movement tendency of the thin plate 3.1. This can improve the performance of the thin plate in withstanding outward pressure, and ultimately make the valve plate have a good sealing effect on the biopsy channel 8.1.

[0031] Based on the preferred embodiment described above, the soft plug body 1 is made of rubber. This rubber material can be any rubber material permitted for existing medical products. These types of rubber materials are all conventional materials used in the current medical device industry and will not be listed individually here.

[0032] Based on the preferred embodiments described above, such as Figure 3 As shown, when an external instrument is inserted into the central channel 2 from top to bottom, a portion of the outer surface 3.1.2 of the thin sheet 3.1 is attached to the external instrument. Although the addition of the annular clearance cavity 6 reduces the frictional resistance between the thin sheet 3.1 and the external instrument, it still causes problems with the smooth insertion process of the external instrument. To further reduce the resistance during the insertion process, the improvement in this embodiment is that the outer surface 3.1.2 of the thin sheet 3.1 has a smooth layer, and the surface friction coefficient of this smooth layer is less than that of the inner surface 3.1.1 of the thin sheet 3.1. Specifically, the smooth layer can be formed on the outer surface 3.1.2 of the thin sheet 3.1 by surface spraying, for example, by using polyurethane coating. This surface treatment method is a mature existing technology in the existing spraying process. Therefore, how this spraying process is implemented will not be described in detail in this embodiment. It should be understood that a smooth layer can be formed on the outer surface 3.1.2 of the thin sheet 3.1 through this existing spraying process. The smooth layer does not affect the elasticity of the sheet 3.1 itself. However, due to the presence of the smooth layer, the sheet 3.1 contacts the external instrument through the smooth layer adhering to the outer wall of the external instrument. Therefore, the smaller coefficient of friction can reduce the frictional resistance between the sheet 3.1 and the external instrument.

[0033] Based on the preferred embodiment described above, the outer surface 3.1.2 of the sheet 3.1 has a convex ridge (not shown in the figure), which extends radially inward along the central channel 2 to form a strip structure. The ridge allows the sheet 3.1 to abut against the outer wall of the external instrument when it is inserted into the central channel 2, thus reducing the contact area and minimizing frictional resistance.

[0034] In some digestive endoscopes, the upper opening of the biopsy channel 8.1 located on the handpiece is not conducive to the direct engagement of a soft plug with the upper opening. Therefore, such as Figure 5As shown, the improvement in this embodiment is that a base 9 is also provided below the soft plug body 1. The base 9 is connected to the soft plug body 1 via a connecting strap 10. Specifically, one end of the connecting strap 10 is fixed to the base 9, and the other end is fixed to the flange 7 of the soft plug body 1. The soft plug body 1, the connecting strap 10, and the base 9 are an integral structure. In this embodiment, the base can be configured to match the biopsy channels on different digestive endoscopes based on their models. During use, the lower end of the base is nested into the corresponding biopsy channel 8.1, and then the soft plug body 1 is placed on the base 9. The base 9 has a connecting channel that connects the central channel 2 inside the soft plug body 1 and the biopsy channel 8.1.

[0035] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

[0036] For those skilled in the art, various changes and modifications will undoubtedly be apparent after reading the above description. Therefore, the appended claims should be considered as covering all changes and modifications that encompass the true intent and scope of this utility model. Any and all equivalent scope and content within the scope of the claims should be considered as still falling within the intent and scope of this utility model.

Claims

1. A soft plug for biopsy channels in a digestive endoscope, characterized in that: The soft plug body (1) includes a tubular soft plug body with a central channel (2). The upper end of the soft plug body (1) extends radially outward to form a flange (7). The central channel (2) of the soft plug body (1) is provided with a valve plate (3) for opening or closing the central channel (2). The valve plate (3) is composed of at least three thin plates (3.1) evenly arranged in the circumferential direction. The thin plates (3.1) are fixed to the soft plug body (1), and any two adjacent thin plates (3.1) are joined together to form a fitting seam (3.2). The thin plates (3.1) are bent inward in the axial direction so that the valve plate (3) composed of all the thin plates (3.1) has an inwardly concave arc-shaped structure.

2. The soft plug for biopsy channels in a digestive endoscope according to claim 1, characterized in that: There are three thin slices (3.1).

3. The soft plug for biopsy channels in a digestive endoscope according to claim 2, characterized in that: The projection of the thin sheet (3.1) on the horizontal plane is fan-shaped, and the rear end of the thin sheet (3.1) and the soft plug body (1) are an integral structure.

4. The soft plug for biopsy channels in digestive endoscopy according to claim 3, characterized in that: The inner wall of the central channel (2) is incised to form a conical surface (4), the diameter d1 of the upper end of the conical surface (4) is greater than the diameter d2 of the lower end of the conical surface (4), and the upper end of the conical surface (4) extends to the connection between the valve plate (3) and the soft plug body (1).

5. The soft plug for biopsy channels in a digestive endoscope according to claim 4, characterized in that: The upper end of the conical surface (4) is connected to the inner surface (3.1.1) of the valve plate (3) through the arc surface (5), and the lower end of the conical surface (4) is connected to the inner wall of the central channel (2).

6. The soft plug for biopsy channels in a digestive endoscope according to claim 5, characterized in that: The soft plug body (1) has an annular clearance cavity (6) surrounding the valve plate (3) inside, and the annular clearance cavity (6) and the arc surface (5) form a thin-walled structure.

7. The soft plug for biopsy channels in a digestive endoscope according to claim 6, characterized in that: The soft plug body (1) is made of rubber.

8. The soft plug for biopsy channels in a digestive endoscope according to claim 7, characterized in that: The outer surface (3.1.2) of the sheet (3.1) has a smooth layer with a surface friction coefficient that is less than that of the inner surface (3.1.1) of the sheet (3.1).

9. The soft plug for biopsy channels in a digestive endoscope according to claim 7, characterized in that: The outer surface (3.1.2) of the sheet (3.1) has outwardly protruding ribs that extend radially inward along the central channel (2) to form a strip structure.

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