Patent Application
20250222235
The disclosure belongs to the field of urological medical instruments, in particular to an improved ureteral access sheath.
A ureteral access sheath is used in urological surgery to establish a convenient access for endoscopes and other instruments to enter the urinary tract. In order to improve the service life of the ureteral access sheath and lumen support, spiral steel wires are embedded in walls of the ureteral access sheath, so that the ureteral access sheath has relatively high elasticity and certain hardness, cannot be bent and shaped in a short distance, and the end of the ureteral access sheath cannot approach a lesion area at close range. During surgical operations, the expulsion of blood clots, small stones, and purulent flocculent matter through the ureteral access sheath is less effective; the end of the ureteral access sheath is too hard to bend, which prevents close access to the lesion area and increases the difficulty and time of operation.
In addition, an introducer sheath also has a negative pressure suction function, so the endoscope needs to be sealed and matched with the introducer sheath; when the existing endoscope uses a sealing valve to seal and match with the introducer sheath, since a dilator needs to be inserted or pulled out, there is interference between the existing sealing valve and the installation position of the dilator. As a result, doctors must install the sealing valve after removing the dilator and then insert the endoscope, and the endoscope contacts the sealing valve surface, which easily causes difficulty in inserting the endoscope and making the procedure complex and laborious for doctors.
In addition, the existing ureteral access sheath installation structure is complex and the negative pressure suction function cannot be adjusted.
Based on the above problems, the present disclosure provides an improved ureteral access sheath, the ureteral access sheath includes:
Preferably, the base body is a tube base communicating with the catheter, and the tube base extends outward relative to its central axis, with two elastic arms provided, and the tail ends of the elastic arms form hangers.
Preferably, a cross-sectional area of the tube segment gradually decreases from the proximal end to the distal end; two limiting platforms are symmetrically arranged on the upper side of the tube segment, and the elastic hanger can abut against the limiting platform.
Preferably, the vent groove is arranged to extend along the length of the tube wall, and the sliding cover is clipped on an inner edge of the vent groove through a sliding part; two fixture blocks are symmetrically arranged on the left and right inside the sliding cover, the fixture blocks extend into the vent groove and prop against the inner sides of left and right edges of the vent groove respectively, and the fixture blocks can slide linearly along the two edges of the vent groove.
Preferably, the tapered sealing ring includes a tapered wall defining a tapered passage, the tapered wall has a proximally located first annular edge and a distally located second annular edge, an inner wall of the tapered wall is circumferentially spaced with ribs extending from the first annular edge toward the second annular edge.
Preferably, the gland includes a gland body and a tapered ring pressed against the inner wall of an inlet side of the tapered wall.
Preferably, the tapered sealing ring is a rubber ring, and the second annular edge of the rubber ring defines an aperture capable of sealingly engaging the catheter of the dilator.
Preferably, the deformable tube segment is a hose.
Preferably, the length of the head segment is configured to match the longitudinal length of a bending part of an endoscope.
Preferably, the hard tube segment is integrally molded or adhesively connected with the deformable tube segment.
With the ureteral access sheath provided by the present disclosure, the elastic hangers of the dilator base are clipped in the snap-fit element of the sheath base, and the sheath tube can be taken out by rotating left and right or pinching left and right hangers inward, which is convenient for introduction and operation.
By improving the sealing valve of the sheath tube, the sealing of the negative pressure passage in the sheath tube can be ensured, and the design of the ribs can reduce the tension of the sealing valve on an insertion instrument and reduce the resistance when a user inserts the instrument.
With the ureteral access sheath provided by the present disclosure, it is possible to manually slide the sliding cover to adjust the area of an open-air vent groove, thereby adjusting the negative pressure suction pressure.
With the ureteral access sheath provided by the present disclosure, it can be ensured that the head segment of the ureteral access sheath can bend along with the bending part of the endoscope. In this way, the ureteral access sheath can enter into the depth of a renal pelvis at a negative angle to a ureter, and can efficiently and thoroughly suck up stones, thus reducing the difficulty and time of surgery.
The technical scheme of the present disclosure will be further described in detail below through specific embodiments and in combination with drawings of the specification;
It should be understood in the description of the present disclosure that the directions or position relationships such as “front”, “rear”, “head”, “tail”, “distal”, “proximal”, “axial” and “radial” are based on those shown in the accompanying drawings, and are used only for facilitating the description of the present disclosure and simplifying the description, not for indicating or implying that the target devices or elements must have a special direction and be constructed and operated at the special direction, so they cannot be understood as the restrictions to the present disclosure.
In the description of the present disclosure, it should be noted that the terms “mount” and “connect” should be understood in a broad sense unless otherwise specified and defined. For example, it may refer to mechanical connection or electrical connection, and may also refer to internal connection or direct connection of two elements or indirect connection of two elements by an intermedium. The person of ordinary skill in the art can understand the specific meaning of the above terms according to specific conditions.
Please refer to
The introducer sheath includes a sheath tube 1 and a sheath base mounted on a proximal end of the sheath tube, the sheath base 2 having a tube segment 20 communicating with the sheath tube and a connecting part 21 arranged at a distal end of the tube segment; the connecting part 21 includes at least two snap-fit elements 21 arranged on the distal end of the tube segment, and the snap-fit elements 21 are bent towards the inside with respect to a central axis of the tube segment 20; the sheath tube 1 and the tube segment 20 integrally define a central passage 100 extending from the proximal end to the distal end;
The dilator 3 includes a catheter 31 and a dilator base 32 mounted at the proximal end of the catheter 31 and the catheter 31 is arranged through the central passage 100, and the dilator base 32 includes a base body 320 and at least two elastic hangers 35 symmetrically arranged on the base body 320, and the base body 320 is connected with the distal end of the catheter 31, and the elastic hangers 35 extend outward relative to the base body 320, and the elastic hangers 35 can be in snap connection with the snap-fit element 21; in some embodiments, the base body 320 is a tube base communicating with the catheter 31, and the tube base extends outward relative to its central axis, with two elastic arms 321 provided, and the tail ends of the elastic arms form hangers 35; specifically, Luer connectors 33 are connected to the tube base. In addition, in the embodiment, the cross-sectional area of the tube segment 20 gradually decreases from the proximal end to the distal end so as to facilitate dilator access. In the embodiment, two limiting platforms 21 are symmetrically arranged on the upper side of the tube segment 20, and the two limiting platforms constitute a snap-fit element, and the elastic hanger 35 can abut against the limiting platform 21. In this way, the elastic hangers 35 of the dilator can be fixed on the limiting platform, and the dilator can be taken out by rotating left and right or pinching left and right hangers inward. The whole process is easy to operate and convenient for doctors to apply force. Compared with the prior art that the dilator base is mounted outside an introducer sheath base, the dilator base provided in the present disclosure is mounted inside the introducer sheath, which can be taken out instantaneously by rotating or pinching inward, and mounting inward makes the operation of the dilator easier and allows for a smoother, more effortless operation.
The ureteral access sheath provided in the embodiment also includes a tapered sealing ring 22 and a gland 23. The tapered sealing ring 22 is arranged in the tube segment 20 of the sheath base 2, the tapered sealing ring 22 forming an inlet 220 for the catheter to seal therethrough. It can be seen from
Referring to
In the description of the specification, descriptions with reference to the terms “one embodiment”, “some embodiments”, “example”, “specific example”, or “some examples” mean that specific features, structures, materials or characteristics described in combination with the embodiment or example are contained in at least one embodiment or example of the present disclosure. In the specification, the schematic expressions of the above terms do not necessarily refer to the same embodiments or examples. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.
Although embodiments of the present disclosure have been shown and described, the person of ordinary skill in the art can understand that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principle and purpose of the present disclosure, and the scope of the present disclosure is defined by the claims and their equivalents.
| Number | Date | Country | Kind |
|---|---|---|---|
| 202111601835.9 | Dec 2021 | CN | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/CN2022/118402 | 9/13/2022 | WO |
