Neural intervention intravascular stent protection sheath tube
By adopting a double-layer structure protective sheath, the inner and outer tubes are combined, the inner tube is a PTFE etched tube, and the outer tube is a PA12 tube, the stent damage caused by the eccentricity of the protective sheath in the prior art is solved, and the smooth transfer and protection of the stent is achieved.
Patent Information
- Application Number
- CN202421527863.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-28
- Publication Date
- 2025-07-08
- Estimated Expiration
- 2034-06-28
AI Technical Summary
During the metastasis of existing neurovascular stents, the protective sheath of the monolayer polymer material can easily lead to eccentricity and different axes, resulting in scratching and damage to the stent and failing to match.
The protective sheath tube with a double-layer structure is composed of an inner tube and an outer tube. The hardness of the inner tube is smaller than that of the outer tube. The outer tube forms a tip by heat shrinkage. The inner tube is a PTFE etched tube, the outer tube is a PA12 tube, and there is a lubricating layer in the center of the inner tube to reduce friction.
It improves the strength of the protective sheath tip of the vascular stent, reduces the probability of deformation, prevents stent damage, and ensures smooth transfer.
Smart Images
Figure CN223068659U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of medical devices, and particularly to a protective sheath for a neurointerventional vascular stent. Background Technique
[0002] The neurovascular stent interventional technique is a common minimally invasive treatment method, which avoids surgical operations. Through puncture of the femoral artery or radial artery and intravascular catheter operation, the treatment stent is delivered to the vascular lesion site, enabling vascular recanalization in a short time. The patient has a small risk during the operation and a quick recovery after the operation, and the interventional treatment has a good development prospect. The vascular stent product is an essential product for thrombectomy in ischemic stroke, intracranial artery stenosis, and interventional surgery for hemorrhagic stroke. Whether the vascular stent can be smoothly transferred to the microcatheter to reach the lesion site determines the success or failure of the operation and the length of the operation time;
[0003] At present, the transfer of the neurovascular stent to the microcatheter is mainly achieved by connecting the protective sheath made of a single-layer polymer material to the base of the microcatheter through tip diameter reduction by heat shrinkage; among them, when the single-layer polymer material protective sheath is implanted, it is necessary to consider that the wall thickness is too thin and lacks hardness after the tip of the single-layer polymer material protective sheath shrinks in diameter, and it is also easy to cause a tolerance between the protective sheath and the microcatheter, resulting in eccentricity and non-coaxiality, which may cause abrasion between the neurovascular stent and the microcatheter and damage the stent, thus leading to a failure in matching with the microcatheter. Content of the Utility Model
[0004] The utility model provides a protective sheath for a neurointerventional vascular stent, which adopts a double-layer structure and can solve at least one problem pointed out in the background technique.
[0005] A protective sheath for a neurointerventional vascular stent includes an inner tube and an outer tube. There is a channel for accommodating a vascular stent at the center of the inner tube. The outer tube is wrapped around the outer surface of the inner tube and has a tip portion formed on the surface of the inner tube. The hardness of the inner tube is less than that of the outer tube.
[0006] Preferably, a lubricating layer is provided in the central channel of the inner tube.
[0007] Preferably, the minimum single-side wall thickness of the tip portion is 0.05 mm.
[0008] Preferably, the wall thickness of the inner tube is 0.002 mm to 0.03 mm, and the length is 200 mm to 800 mm.
[0009] Preferably, the inner tube is a PTFE etched tube.
[0010] Preferably, the outer tube is a PA12 tube.
[0011] Preferably, the outer tube forms the tip portion on the surface of the inner tube by heat shrinkage.
[0012] Compared with the prior art, the beneficial effects of the present utility model are as follows: The protective sheath of the present utility model adopts a double-layer structure, which can not only prevent the vascular stent from being damaged, but also enable the tip of the protective sheath (i.e., the pointed end portion) to have sufficient strength, reducing the probability of deformation of the protective sheath. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 It is a schematic structural diagram of the present utility model.
[0014] Description of the reference numerals:
[0015] 1 - inner tube, 2 - outer tube, 3 - pointed end portion. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0016] The following will describe in detail a specific embodiment of the present utility model with reference to the drawings, but it should be understood that the protection scope of the present utility model is not limited by the specific embodiment.
[0017] As Figure 1 shown, a neurointerventional vascular stent protection sheath provided by an embodiment of the present utility model includes an inner tube 1 and an outer tube 2. A channel for accommodating a vascular stent is provided at the center of the inner tube 1. The outer tube 2 is wrapped around the outer surface of the inner tube 1 and has a pointed end portion 3 formed on the surface of the inner tube 1. Specifically, the outer tube 2 forms the pointed end portion 3 on the surface of the inner tube 1 by heat shrinkage. The hardness of the inner tube 1 is less than that of the outer tube 2;
[0018] In some embodiments, in order to make the outer tube 2 have sufficient hardness, a PA12 tube is selected. When the heat-shrunk pointed end portion is formed on the inner tube 1, it still has sufficient hardness with a single-sided wall thickness of 0.05 mm.
[0019] In some embodiments, to avoid damaging the vascular stent, the inner tube 1 is made of a polymer material tube with a hardness lower than that of the outer tube 2, such as PT, PTFE, PE, etc. When the inner tube 1 is a polymer material tube with a relatively high coefficient of friction, a lubricating layer should be provided in its central channel to reduce friction. If a PTFE etched tube is selected, in order to save costs, a lubricating layer may not be provided in its internal channel;
[0020] In some embodiments, the wall thickness of the inner tube 1 is 0.002 mm to 0.03 mm, and the length is 200 mm to 800 mm.
[0021] The protective sheath of the present utility model adopts a double-layer structure, which can not only prevent the vascular stent from being damaged, but also enable the tip of the protective sheath (i.e., the pointed end portion) to have sufficient strength, reducing the probability of deformation of the protective sheath.
[0022] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above-described exemplary embodiments, and without departing from the spirit and basic characteristics of the present utility model, the present utility model can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present utility model. Any reference signs in the claims should not be construed as limiting the claims involved.
[0023] In addition, it should be understood that although this specification is described according to the embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.
Claims
1. A neurointerventional vascular stent protection sheath tube, characterized in that It includes an inner tube and an outer tube. There is a channel for accommodating a vascular stent at the center of the inner tube. The outer tube is wrapped around the outer of the inner tube and has a pointed end formed on the surface of the inner tube. The hardness of the inner tube is less than that of the outer tube.
2. The neurointerventional vascular stent protection sheath tube according to claim 1, characterized in that, There is a lubricating layer in the central channel of the inner tube.
3. The neurointerventional vascular stent protection sheath tube according to claim 1, characterized in that, The minimum unilateral wall thickness of the pointed end is 0.05 mm.
4. The nerve intervention blood vessel stent protection sheath tube according to claim 1, wherein, The wall thickness of the inner tube is 0.002 mm to 0.03 mm, and the length is 200 mm to 800 mm.
5. The nerve intervention blood vessel stent protection sheath tube according to claim 1, characterized in that, The inner tube is a PTFE etched tube.
6. The neurointerventional vascular stent protection sheath tube according to claim 1, characterized in that, The outer tube is a PA12 tube.
7. The neurointerventional vascular stent protection sheath tube according to claim 1, wherein, The outer tube forms the pointed end on the surface of the inner tube by heat shrinkage.