An adjustable outer sheath
By designing an adjustable external sheath and utilizing a combination of knobs and tightening wires, the inward retraction function of the sheath is achieved, solving the problem of difficulty in retrieving traditional sheaths during vascular spasm or dilation, and improving the safety of interventional treatment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHONGSHAN HOSPITAL FUDAN UNIV
- Filing Date
- 2024-12-31
- Publication Date
- 2026-06-12
AI Technical Summary
In cardiovascular interventional therapy, traditional sheaths are difficult to retrieve during vasospasm or initial passive dilation of blood vessels, which may lead to vascular detachment and serious consequences.
An adjustable outer sheath was designed, comprising a sheath, a knob, and a tightening wire in a spiral channel. By rotating the knob and pulling the tightening wire, the sheath is retracted, thus solving the problem of difficult retrieval.
This effectively avoids difficulties in sheath retrieval, reduces vascular damage, and improves the safety and success rate of interventional treatment.
Smart Images
Figure CN224345265U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of medical device technology, and in particular to an adjustable outer sheath tube. Background Technology
[0002] Cardiovascular interventional therapy, compared to traditional open surgery, offers advantages such as minimal invasiveness and faster recovery, making it highly favored by both doctors and patients. In recent years, with advancements in innovative cardiovascular medical devices, cardiovascular interventional surgery has shown a continuous growth trend. A crucial aspect of cardiovascular interventional therapy is the selection of the vascular access route; among various routes, the femoral artery is the most commonly used. As patients age, their blood vessels often harden, become tortuous, and lose elasticity, making the protection of the vascular access route paramount during interventional treatment.
[0003] Typically, during interventional procedures, interventional treatment devices (such as TAVR and TEVAR systems) cannot directly reach the treatment site via the femoral artery. A sheath must first be implanted from the femoral artery to the iliac artery segment, and then the interventional device is delivered through the sheath. Early sheaths primarily served to protect the access route, but situations arose where the implanted system was too large, making implantation difficult. The advent of dilatable sheaths has alleviated this problem to some extent while also protecting the vascular access route. However, another situation has arisen clinically: after the interventional device has been implanted, vasospasm or initial passive vascular dilation can make sheath retrieval difficult. Forced withdrawal can easily lead to vascular sleeve detachment, resulting in catastrophic consequences. Utility Model Content
[0004] Therefore, the purpose of this utility model is to provide an adjustable outer sheath tube to solve the technical problems mentioned in the background art.
[0005] This utility model proposes an adjustable outer sheath tube, including a sheath tube and a knob rotatably disposed at the tail end of the sheath tube. The inner wall of the sheath tube is provided with a spiral channel, which is arranged along the axial direction of the sheath tube. A tightening wire is inserted into the spiral channel. One end of the tightening wire is fixedly connected to the front end of the sheath tube, and the other end of the tightening wire passes through the outer wall of the sheath tube and is connected to the knob.
[0006] Furthermore, in the adjustable outer sheath, the axial end face of the sheath is provided with a through hole communicating with the spiral channel, and the end of the tightening wire away from the knob passes through the through hole and is connected to a limiting end.
[0007] Furthermore, in the adjustable outer sheath, the size of the limiting end is greater than the through hole and less than the wall thickness of the sheath.
[0008] Furthermore, in the adjustable outer sheath, the tightening wire is fixed to the front end of the sheath by a heat-fusion connection.
[0009] Furthermore, the adjustable outer sheath has a plurality of support bars on its inner wall, and the plurality of support bars are arranged at intervals along the circumference of the inner wall of the sheath.
[0010] Furthermore, the adjustable outer sheath has two limiting rings on its outer wall, and the two limiting rings are located on both sides of the knob.
[0011] Furthermore, in the adjustable outer sheath, the diameter of the front port of the sheath is smaller than the diameter of the tail port.
[0012] Furthermore, the adjustable outer sheath is made of silicone or rubber material.
[0013] Furthermore, in the adjustable outer sheath, the tightening wire is made of a polymer material or a metal material.
[0014] Furthermore, the adjustable outer sheath is provided with a hydrophilic coating on both its inner and outer walls.
[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:
[0016] Postoperatively, by turning the knob to pull the tightening wire, the sheath can be retracted under the action of the tightening wire, effectively avoiding the problem of difficulty in sheath retrieval due to vasospasm or initial passive vasodilation. Attached Figure Description
[0017] Figure 1 This is a perspective view of the adjustable outer sheath tube in this utility model from a first-view perspective;
[0018] Figure 2 This is a perspective view of the adjustable outer sheath tube in this utility model from a second perspective.
[0019] Figure 3 for Figure 1 A magnified view of a portion of position A in the diagram;
[0020] Figure 4 This is a cross-sectional view of the sheath tube in this utility model;
[0021] Figure 5 This is a distribution diagram of the support strips in this utility model;
[0022] Explanation of key component symbols:
[0023] 11. Sheath; 12. Knob; 13. Tightening screw; 14. Through hole; 15. Limiting end; 20. Support bar; 30. Limiting retaining ring.
[0024] The following detailed description, in conjunction with the accompanying drawings, will further illustrate this utility model. Detailed Implementation
[0025] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. Several embodiments of this utility model are shown in the drawings. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this utility model will be more thorough and complete.
[0026] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.
[0027] Unless otherwise defined, 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 invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.
[0028] Please see Figures 1 to 5 The adjustable outer sheath of this utility model includes a sheath 11 and a knob 12 rotatably disposed at the tail end of the sheath 11. The inner wall of the sheath 11 is provided with a spiral channel, which is arranged along the axial direction of the sheath 11. A tightening wire 13 is inserted into the spiral channel. One end of the tightening wire 13 is fixedly connected to the front end of the sheath 11, and the other end of the tightening wire 13 passes through the outer wall of the sheath 11 and is connected to the knob 12.
[0029] After the operation, by rotating the knob 12 to pull the tightening wire 13, the sheath 11 can be retracted under the action of the tightening wire 13, which effectively avoids the problem of difficulty in retracting the sheath 11 due to vasospasm or initial passive vasodilation.
[0030] See Figure 1 In this embodiment, the diameter of the front end of the sheath 11 is smaller than the diameter of the tail end. The overall structure is a tapered tube, a design that makes it easier to insert the sheath 11 into blood vessels or other lumens, reducing resistance during insertion and damage to surrounding tissues.
[0031] Additionally, it should be noted that in this embodiment, the sheath 11 is made of an elastic material with a certain degree of expandability, so as to realize a certain degree of expandability and retraction of the sheath 11. Specifically, the elastic material can be medical silicone, rubber, etc., and in this embodiment, medical silicone is preferred.
[0032] For details, please refer to Figure 1 and Figure 3 The sheath 11 has a through hole 14 communicating with the spiral channel on its axial end face. The end of the tightening wire 13 away from the knob 12 extends out of the through hole 14 and is connected to a limiting end 15. Understandably, when medical personnel rotate the knob 12 to pull the tightening wire 13, the limiting end 15 at the front end of the tightening wire 13 abuts against the axial end face of the sheath 11, forming a stable fixed point. Then, as the rotation angle of the knob 12 increases, the tightening wire 13 gradually tightens the sheath 11, causing the sheath 11 to detach from contact with the blood vessel wall, facilitating its removal.
[0033] Furthermore, in another embodiment of this invention, the tightening wire 13 can also be fixed to the front end of the sheath tube 11 by means of heat fusion connection.
[0034] Additionally, it should be noted that in this embodiment, the tightening wire 13 is preferably made of a polymer material. Of course, it can also be made of a metal material, and the choice can be made according to actual needs. This embodiment is only an example and not a limitation.
[0035] Furthermore, the size of the limiting end 15 is larger than the wall thickness of the through hole 14 and smaller than that of the sheath 11, so as to ensure the limiting effect without appearing too abrupt.
[0036] See Figure 5 The inner wall of the sheath 11 is provided with a plurality of support strips 20, which are arranged at intervals along the circumference of the inner wall of the sheath 11. Specifically, in this embodiment, there are three support strips 20. The purpose of the support strips 20 is to maintain a certain strength of the sheath 11 and to ensure the stable operation of the tightening function of the sheath 11, so as to avoid insufficient support of the sheath 11, which would cause the front end of the sheath 11 to tilt upward when the knob 12 is turned.
[0037] For further details, please refer to [link / reference]. Figure 1 and Figure 2 The outer wall of the sheath 11 is provided with two limiting rings 30, which are located on both sides of the knob 12 to limit the rotation position of the knob 12.
[0038] Furthermore, the inner and outer walls of the sheath 11 are coated with a hydrophilic coating. Understandably, the hydrophilic coating has lubricating properties and can reduce friction. The hydrophilic coating on the inner wall of the sheath 11 facilitates the smooth passage of instruments inside the sheath 11, while the hydrophilic coating on the outer wall of the sheath 11 can protect blood vessels and reduce unnecessary damage caused by friction between the sheath 11 and blood vessels.
[0039] In practical applications, the insertion method of the adjustable external sheath is the same as that of the traditional sheath. It also requires inserting a guide wire by puncturing the target blood vessel, inserting the guide core into the adjustable external sheath, and then implanting the expandable sheath 11 system along the guide wire. The guide core is then removed to complete the establishment of the cardiovascular interventional access. After the operation is completed, the sheath 11 can be tightened by rotating the knob 12, making it easy to remove the sheath 11.
[0040] In summary, the adjustable external sheath in the above embodiments of this utility model allows the sheath 11 to retract under the action of the tightening wire 13 by rotating the knob 12 after surgery, effectively avoiding the problem of difficulty in retracting the sheath 11 due to vasospasm or initial passive vasodilation.
[0041] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0042] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.
Claims
1. An adjustable outer sheath, characterized in that, The device includes a sheath and a knob that is rotatably located at the tail end of the sheath. The sheath has a spiral channel inside its wall, which is arranged along the axis of the sheath. A tightening wire passes through the spiral channel. One end of the tightening wire is fixedly connected to the front end of the sheath, and the other end of the tightening wire passes through the outer wall of the sheath and connects to the knob.
2. The adjustable outer sheath according to claim 1, characterized in that, The axial end face of the sheath is provided with a through hole communicating with the spiral channel, and the end of the tightening wire away from the knob passes through the through hole and is connected to a limiting end.
3. The adjustable outer sheath according to claim 2, characterized in that, The size of the limiting end is greater than the thickness of the through hole but less than the wall thickness of the sheath.
4. The adjustable outer sheath according to claim 1, characterized in that, The tightening wire is fixed to the front end of the sheath by heat fusion connection.
5. The adjustable outer sheath according to claim 1, characterized in that, The inner wall of the sheath is provided with a plurality of support bars, which are arranged at intervals along the circumference of the inner wall of the sheath.
6. The adjustable outer sheath according to claim 1, characterized in that, The outer wall of the sheath is provided with two limiting rings, which are located on both sides of the knob.
7. The adjustable outer sheath according to claim 1, characterized in that, The diameter of the front end of the sheath is smaller than the diameter of the tail end.
8. The adjustable outer sheath according to claim 1, characterized in that, The sheath is made of silicone or rubber.
9. The adjustable outer sheath according to claim 1, characterized in that, The tightening wire is made of polymer or metal materials.
10. The adjustable outer sheath according to claim 1, characterized in that, The inner and outer walls of the sheath are coated with a hydrophilic coating.