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WO-2026092749-A1 - NEGATIVE-PRESSURE SUCTION SHEATH

WO2026092749A1WO 2026092749 A1WO2026092749 A1WO 2026092749A1WO-2026092749-A1

Abstract

A negative-pressure suction sheath, comprising a sheath tube (100) and a blocking structure (200), wherein the sheath tube (100) is arranged at a distal end of the negative-pressure suction sheath; a distal end of the sheath tube (100) is provided with a passive bending section (110) that can bend following an active bending section (310) of an endoscope; a side wall of the passive bending section (110) is provided with a through opening (111) that extends in the extension direction of the passive bending section (110), the maximum depth of the through opening (111) being less than half the outer diameter of the passive bending section (110); the blocking structure (200) is connected to the sheath tube (100) and seals the through opening (111); and the passive bending section (110) comprises an expandable portion (112) arranged radially opposite the through opening (111), and when the passive bending section (110) is bent and the side of the expandable portion (112) facing away from the through opening (111) is a tension side, the expandable portion (112) expands outward in a direction perpendicular to the plane in which the bending direction of the passive bending section (110) is located. The negative-pressure suction sheath solves the problem of unsmooth stone removal when an insertion portion is used to bend the distal end of the sheath tube to suction stones laterally.

Inventors

  • ZHOU, Guanhua
  • JIANG, Zhendong

Assignees

  • 湖南省华芯医疗器械有限公司

Dates

Publication Date
20260507
Application Date
20251104
Priority Date
20241104

Claims (10)

  1. A negative pressure suction sheath, characterized in that it comprises a sheath tube (100) and a sealing structure (200), wherein the sheath tube (100) is disposed at the distal end of the negative pressure suction sheath, the distal end of the sheath tube (100) has a passive bending section (110) capable of bending with an active bending section (310) of an endoscope, the sidewall of the passive bending section (110) is provided with a through-hole (111), the through-hole (111) extends along the extension direction of the passive bending section (110), the maximum depth of the through-hole (111) is less than half of the outer diameter of the passive bending section (110), and the sealing structure (200) is connected to the sheath tube (100) and seals the through-hole (111). The passive bending section (110) includes an expandable portion (112) disposed radially opposite to the through opening (111). When the passive bending section (110) bends and the side of the expandable portion (112) away from the through opening (111) is the stretching side, the expandable portion (112) expands outward along a plane perpendicular to the bending direction of the passive bending section (110).
  2. According to claim 1, the negative pressure suction sheath is characterized in that the depth of the middle part of the through-hole (111) along the extension direction of the passively bent section (110) is less than the depth of the other parts of the through-hole (111).
  3. According to claim 2, the negative pressure suction sheath is characterized in that the bottom wall of the through-hole (111) includes an arc-shaped portion (1111), the arc-shaped portion (1111) being located at the middle of the through-hole (111) along the extension direction of the passively bent section (110).
  4. According to claim 3, the negative pressure suction sheath is characterized in that the bottom wall of the through-hole (111) further includes two connecting parts (1112), the two connecting parts (1112) are respectively located on both sides of the arc-shaped part (1111) and are connected to the arc-shaped part (1111), and each connecting part (1112) is a plane.
  5. According to claim 1, the negative pressure suction sheath is characterized in that the inner wall of the through-hole (111) has the outline of a supporting tongue (113) formed on the side wall of the passively bent section (110), the supporting tongue (113) being located at one end of the through-hole (111).
  6. According to claim 5, the negative pressure suction sheath is characterized in that the direction in which the supporting tongue (113) extends from one end to the other end connected to the other part of the passive bending section (110) is a first direction, and the first direction is parallel to the extension direction of the passive bending section (110).
  7. According to claim 6, the negative pressure suction sheath is characterized in that a first cut surface (101) and a second cut surface (102) are formed on the side wall of the passive bending section (110), the first cut surface (101) and the second cut surface (102) intersect each other, and the inner wall of the through opening (111) includes the first cut surface (101) and the second cut surface (102). The first cut surface (101) and the second cut surface (102) are both inclined relative to the axial direction of the passive bending section (110). The angle between the first cut surface (101) and the second cut surface (102) is an acute angle, and the inclination directions of the first cut surface (101) and the second cut surface (102) are opposite. The plane of the inner wall of the support tongue (113) coincides with the second cut surface (102).
  8. According to claim 1, the negative pressure suction sheath is characterized in that the number of the through-holes (111) includes two, the two through-holes (111) are respectively provided on opposite sides of the passive bending section (110), and the two through-holes (111) are spaced apart along the extension direction of the passive bending section (110).
  9. According to claim 1, the negative pressure suction sheath is characterized in that, when the passive bending section (110) bends and squeezes the portion of the sealing structure (200) that seals the through opening (111), the squeezed portion of the sealing structure (200) bulges outward toward the through opening (111).
  10. According to claim 9, the negative pressure suction sheath is characterized in that, when the passive bending section (110) is in a straightened state, the portion of the sealing structure (200) that seals the through-hole (111) is pre-bulged toward the outside of the through-hole (111). When the passive bending section (110) bends and compresses the pre-bulging portion of the sealing structure (200), the pre-bulging portion of the sealing structure (200) bulges outward toward the through opening (111).

Description

Negative pressure suction sheath Technical Field This application belongs to the field of medical device technology, specifically relating to a negative pressure suction sheath. Background Technology Negative pressure suction sheaths are commonly used in urological endoscopic examinations or surgeries. They can create a surgical channel within the urinary system to assist endoscopes and surgical instruments in passing through cavities such as the urethra and ureters, thereby improving the effectiveness and safety of examinations and treatments. When using a negative pressure suction sheath to remove kidney stones, a guidewire is used to insert the sheath into the kidney, and then the insertion part of the endoscope is inserted into the sheath to observe and break up the stone. When the stone is located to the side of the sheath, the insertion part can be used to bend the distal end of the sheath, bringing the sheath towards the stone and aspirating it into the gap between the insertion part and the sheath, thus expelling the stone. However, in practice, when using the insertion part to bend the distal end of the sheath to aspirate stones from the side, problems with stone expulsion are common. Summary of the Invention The purpose of this application is to provide a negative pressure suction sheath that can solve the problem of poor stone expulsion when using the insertion part to bend the distal end of the sheath tube to suction stones from the side. To solve the above-mentioned technical problems, this application is implemented as follows: This application provides a negative pressure suction sheath, including a sheath tube and a sealing structure. The sheath tube is located at the distal end of the negative pressure suction sheath. The distal end of the sheath tube has a passive bending section that can follow the bending of the active bending section of the endoscope. The side wall of the passive bending section is provided with a through-hole. The through-hole extends along the extension direction of the passive bending section. The maximum depth of the through-hole is less than half of the outer diameter of the passive bending section. The sealing structure is connected to the sheath tube and seals the through-hole. The passive bending section includes an expandable portion disposed radially opposite to the through opening. When the passive bending section bends and the expandable portion is on the stretching side away from the through opening, the expandable portion expands outward along a plane perpendicular to the bending direction of the passive bending section. The beneficial technical effects of this application are as follows: In this application, a through-hole is provided on the passively bent section. This through-hole disrupts the continuity of the passively bent section, causing stress concentration near the through-hole during bending. The area of stress concentration is more prone to deformation due to excessive local stress. This causes the expandable portion, radially opposite the through-hole, to expand outwards along a plane perpendicular to the bending direction of the passively bent section, releasing the stress accumulated during bending. The outward radial expansion of the expandable portion increases the distance between its inner wall and the active bent section, thereby increasing the flow area and the minimum of the maximum distances. This allows the target material to pass smoothly through the gap between the bent active and passive sections, thus solving the problem of difficulty in expelling stones and awaiting suction. When the passive bending section of this application does not bend along with the active bending section, the portion of the sealing structure located at the penetration opening will not be squeezed. Therefore, the sealing structure will not bulge outward from the penetration opening. In other words, when the passive bending section is in a straight state, the outer diameter of each part of the passive bending section in its own extension direction is small, which is beneficial for inserting the sheath into the human body. Attached Figure Description Figure 1 is an exploded schematic diagram of a portion of the structure of the guidance sheath disclosed in the first embodiment of this application; Figure 2 is an exploded schematic diagram of a portion of the structure of the guide sheath when the passive bending segment disclosed in the first embodiment of this application is bent. Figure 3 is an exploded schematic diagram of a portion of the guiding sheath structure disclosed in the second embodiment of this application; Figure 4 is an enlarged schematic diagram of point A in Figure 3 of this application; Figure 5 is an exploded schematic diagram of a portion of the structure of the guide sheath when the passive bending segment disclosed in the second embodiment of this application is bent. Figure 6 is an exploded schematic diagram of a portion of the guid