CN219681429U

CN219681429U - Ureter guiding sheath tube

Info

Publication number: CN219681429U
Application number: CN202223360798.XU
Authority: CN
Inventors: 荀皓; 王皓; 何健
Original assignee: Medco Medical Technology Shanghai Co ltd
Current assignee: Medco Medical Technology Shanghai Co ltd
Priority date: 2022-12-13
Filing date: 2022-12-13
Publication date: 2023-09-15
Anticipated expiration: 2032-12-13

Abstract

The utility model provides a ureter guiding sheath tube, and belongs to the field of medical appliances. The guiding sheath tube is formed by compounding a catheter outer layer, a metal middle layer and a catheter inner layer, and is divided into a sheath tube front end and a sheath tube rear end along the length direction. The introducer sheath is changeable between a curved state and a flat state following the shape of the lumen after entering the lumen. When in use, the front end of the sheath tube of the guiding sheath tube can be bent into a required angle according to the requirement due to the flexibility, so that the guiding sheath tube can enter the lower cup of the renal pelvis and protect the human body from being injured, and meanwhile, the rear end of the sheath tube has certain rigidity, a working channel can be established, the guiding sheath tube is convenient for medical instruments to enter, and the use requirement of clinicians is met.

Description

Ureter guiding sheath tube

Technical Field

The utility model belongs to the technical field of medical instruments, and particularly relates to a ureter guiding sheath tube.

Background

In endoluminal urological surgery or examination, ureteral introducer sheaths are often used to dilate and support the ureter, creating a working channel for the entry of an endoscope or other device.

In actual clinical practice, some patients have a stone position under the renal pelvis and need a large angle to reach, which requires a certain rigidity of the guiding sheath tube of the ureter guiding sheath and a certain softness of the front end of the sheath tube. The rigidity of the sheath tube can be kept to facilitate the insertion of the instrument, and the softness of the front end of the sheath tube can reduce the damage to the viscera and the like of a patient in the advancing process.

Most of the existing ureter guiding sheath pipes are of three-layer composite structures of an outer layer of a catheter, a metal middle layer and an inner layer of the catheter, the rigidity of the guiding sheath pipe is determined by the material and the shape of the metal middle layer, as in the ureter guiding sheath disclosed in patent CN204637260U, the metal middle layer of the guiding sheath pipe is of a spiral spring-shaped structure, the rigidity of the guiding sheath pipe is controlled by the arrangement tightness degree of spiral wires, and the guiding sheath pipe has flexibility to a certain extent by the method, but because the thickness of the used metal wires is the same, the flexibility effect is not obvious, and the guiding sheath pipe has a further lifting space.

Disclosure of Invention

The utility model aims to provide a novel ureter guiding sheath tube, which solves the problem that the guiding sheath tube in the prior art is difficult to consider both rigidity and flexibility, so that the guiding sheath tube can easily enter a ureter, expands and supports a working channel without scratching human organs, and meets the use requirements of clinicians.

Therefore, the utility model provides a ureter guiding sheath tube, which is composed of a three-layer structure in a composite way, and comprises a catheter outer layer 1, a metal middle layer 2 and a catheter inner layer 3 from outside to inside, wherein the metal middle layer 2 is composed of metal wires and is wound on the catheter inner layer 3, the catheter outer layer 1 is covered on the metal middle layer 2, and the guiding sheath tube is divided into a sheath tube front end 4 and a sheath tube rear end 5 along the length direction.

Preferably, the rigidity of the front end 4 of the guiding sheath tube is smaller than that of the rear end 5 of the guiding sheath tube

Preferably, the length ratio of the sheath front end 4 to the sheath rear end 5 ranges from one to three to two.

Preferably, the metal intermediate layer 2 of the sheath front end 4 and the sheath rear end 5 is a spring or a braided wire.

Preferably, the braided wire is composed of one or more groups of springs, each group being two mutually intersecting springs of opposite or identical sense.

Preferably, the spring and the braided wire are made of stainless steel.

Preferably, the diameter of the spring or braided wire at the forward end 4 of the sheath is smaller than the diameter of the spring or braided wire at the rearward end 5 of the sheath.

Preferably, the spring pitch of the spring used at the front end 4 of the sheath tube or the distance between two adjacent turns of the knitting yarn is larger than the spring pitch of the spring used at the rear end 5 of the sheath tube or the distance between two adjacent turns of the knitting yarn.

Preferably, the spring or braided wire at the front end 4 of the sheath is engaged with the spring or braided wire at the rear end 5 of the sheath.

Preferably, the front end 4 of the guiding sheath tube can be bent at random within the range of 0-270 degrees.

The beneficial effects are that:

(1) The utility model provides a ureter guiding sheath tube which can be changed between a bending state and a straight state, and can be bent to a required angle according to the requirement when entering a human body, so that the guiding sheath tube is close to stone fragments of a lower cup of a renal pelvis, and the stone fragments are flushed out along the guiding sheath tube through water flow, thereby meeting the requirement of clinicians.

(2) The rigidity of the front end of the sheath tube of the guiding sheath tube is different from that of the rear end of the sheath tube, the front end of the sheath tube has flexibility, can be bent within an angle of 0-150 degrees, changes the angle along with the shape of the cavity when entering the cavity of a human body, and reduces the probability of cavity injury; the rear end of the sheath tube has high rigidity, so that the device can be conveniently inserted into a catheter, and the precision device is prevented from being damaged.

(3) The braiding wires are braided together in a way that one or more groups of springs with opposite rotation directions are crossed with each other, and when one spring with the rotation direction is acted by a transverse external force, the other springs with the rotation directions provide opposite acting forces so as to improve the rigidity of the guiding sheath tube.

(4) The diameters of the spring or the braided wire used at the front end of the sheath tube and the rear end of the sheath tube are different, so that the rigidity of the guiding sheath tube can be adjusted more easily, and the smaller the diameter of the spring or the braided wire at the front end of the sheath tube is, the better the flexibility is, the larger the diameter is, and the rigidity is larger.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a side cross-sectional view of one embodiment of a ureteral introducer sheath provided by the present utility model.

Fig. 2 is an exploded view of an embodiment of a ureteral introducer sheath provided by the present utility model.

Fig. 3 is a schematic diagram of an overall structure of a ureteral guiding sheath according to an embodiment of the present utility model.

In the figure: 1-catheter outer layer 2-metal middle layer 3-catheter inner layer 4-sheath front end 5-sheath rear end

Detailed Description

The contents of the present utility model can be more easily understood by referring to the following detailed description of preferred embodiments of the present utility model and examples included. Unless defined otherwise, 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 utility model belongs. In case of conflict, the present specification, definitions, will control.

In the description of the present utility model, it should also be noted that, unless explicitly specified and limited otherwise, the terms "connected," "engaged," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

Example 1:

as shown in fig. 1 and 2, the ureter guiding sheath tube is composed of three layers, namely a catheter outer layer 1, a metal middle layer 2 and a catheter inner layer 3 from outside to inside, wherein the total length of the guiding sheath tube is 600mm, the guiding sheath tube is divided into a sheath tube front end 4 and a sheath tube rear end 5 along the length direction, the sheath tube front end is 200mm, and the sheath tube rear end is 400mm. The metal intermediate layer 2 of sheath front end 4 is the spring, and the spring diameter is 0.2mm, and the pitch is 5mm, and the metal intermediate layer 2 of sheath rear end is braided wire, and braided wire diameter is 0.4mm, and the distance of two adjacent ring layers is 2mm. The front end of the sheath tube has better flexibility and the rear end of the sheath tube has higher rigidity.

Example 2:

as shown in fig. 1 and 2, the ureter guiding sheath tube is composed of three layers, namely a catheter outer layer 1, a metal middle layer 2 and a catheter inner layer 3 from outside to inside, wherein the total length of the guiding sheath tube is 800mm, the guiding sheath tube is divided into a sheath tube front end 4 and a sheath tube rear end 5 along the length direction, the sheath tube front end is 200mm, and the sheath tube rear end is 600mm. The metal intermediate layer 2 at the front end 4 of the sheath tube is braided wire, the diameter of the braided wire is 0.2mm, the distance between two adjacent ring layers is 8mm, the metal intermediate layer 2 at the rear end of the sheath tube is braided wire, the diameter of the braided wire is 0.4mm, and the distance between two adjacent ring layers is 5mm. The front end of the sheath tube has better flexibility and the rear end of the sheath tube has higher rigidity.

Example 3:

as shown in fig. 1-3, the ureteral guiding sheath is used in a ureteral guiding sheath, and the specific using method is as follows: the ureteral introducer sheath is first introduced into the body at the site where a passageway is to be established using a guidewire, and then the dilator is removed, leaving the introducer sheath in the patient. The front end 4 of the sheath tube can be freely bent according to the shape of the human body cavity, enters the lower cup of the renal pelvis of the patient, reduces the damage to the cavity of the patient, and the rear end 5 of the sheath tube is kept in a straight state, so that a working channel for operation is established. The surgical instrument can be accessed through the introducer sheath to break up stones in the inferior palace and draw the stones out through the introducer sheath by negative pressure.

The foregoing examples are illustrative only and serve to explain some features of the method of the utility model. The appended claims are intended to claim the broadest possible scope and the embodiments presented herein are merely illustrative of selected implementations based on combinations of all possible embodiments. It is, therefore, not the intention of the applicant that the appended claims be limited by the choice of examples illustrating the features of the utility model. Some numerical ranges used in the claims also include sub-ranges within which variations in these ranges should also be construed as being covered by the appended claims where possible.

Claims

1. The ureter guiding sheath is characterized by being formed by compounding three layers of structures, namely a catheter outer layer (1), a metal middle layer (2) and a catheter inner layer (3) from outside to inside, wherein the metal middle layer (2) is formed by metal wires and is wound on the catheter inner layer (3), the catheter outer layer (1) covers the metal middle layer (2), and the guiding sheath is divided into a sheath front end (4) and a sheath rear end (5) along the length direction; the diameter of the spring or the braided wire at the front end (4) of the sheath tube is smaller than that of the spring or the braided wire at the rear end (5) of the sheath tube; the front end (4) of the guiding sheath tube can be bent at random within the range of 0-270 degrees.

2. Ureteral introducer sheath according to claim 1, characterized in that the sheath front end (4) has a lower rigidity than the sheath rear end (5).

3. Ureteral introducer sheath according to claim 1, characterized in that the length ratio of the sheath front end (4) to the sheath rear end (5) ranges from one to three to one to two.

4. Ureteral guiding sheath according to claim 1, characterized in that the metal wires used for the metal intermediate layer (2) of the sheath front end (4) and the sheath rear end (5) are springs or braided wires.

5. The ureteral introducer sheath of claim 4, wherein the braided wire is comprised of one or more sets of springs, each set being two interdigitated springs of opposite or equal sense of rotation.

6. The ureteral introducer sheath according to claim 4, characterized in that the spring and the braided wire are made of stainless steel.

7. Ureteral guide sheath according to claim 4, characterized in that the spring pitch of the spring used for the sheath front end (4) or the spacing between two adjacent turns of braided wire is greater than the spring pitch of the spring used for the sheath rear end (5) or the spacing between two adjacent turns of braided wire.

8. A ureteral guiding sheath according to claim 3, characterized in that the spring or braided wire of the sheath's front end (4) is joined with the spring or braided wire of the sheath's rear end (5).