Micro-catheter assembly for conveying self-expanding intracranial drug eluting stent

Abstract

The utility model discloses a self-expanding type intracranial drug eluting stent conveying microcatheter assembly, which belongs to the field of medical instruments and comprises a microcatheter and a base, the base is provided with an access end and a connecting end, and the base comprises a base access section, a base reducing section and a flat direct access section which are sequentially connected; the base variable-diameter section is communicated with the base access section and the flat direct access section, and the inner diameter of the base variable-diameter section is gradually reduced in the direction from the base access section to the flat direct access section; the micro-catheter is provided with the flaring section, so that the protective sheath tube can extend into the near end of the micro-catheter, and the influence of the joint of the micro-catheter base and the micro-catheter on the integrity of a medicine coating is reduced; and the PTFE film layer is arranged in the micro catheter, so that the integrity of the drug coating on the drug eluting stent can be improved.

Description

Technical Field

[0001] The utility model relates to the field of medical devices, and particularly relates to a microcatheter assembly for delivering a self-expanding intracranial drug-eluting stent. Background Art

[0002] Limited by the structure of the microcatheter base of the traditional microcatheter assembly, the protective sheath of the drug-eluting stent cannot enter the bottom end of the microcatheter base. Moreover, due to the expansion performance of the self-expanding stent, at the connection between the microcatheter base and the microcatheter, the drug coating on the surface of the drug-eluting stent is likely to be rubbed off, so that the drug coating cannot be completely delivered to the lesion part, resulting in the treatment effect not meeting the expectation. Summary of the Utility Model

[0003] The utility model provides a microcatheter assembly for delivering a self-expanding intracranial drug-eluting stent to solve the problems pointed out in the background art.

[0004] A microcatheter assembly for delivering a self-expanding intracranial drug-eluting stent includes a microcatheter and a base. The base has an access end and a connection end. The inner diameter of the access end is larger than that of the connection end. The connection end is butt-jointed with the proximal end of the microcatheter and the inner diameter of the connection end is not larger than that of the proximal end.

[0005] The base includes a base access section, a base diameter-changing section, and a straight access section which are connected in sequence;

[0006] The base diameter-changing section connects the base access section and the straight access section, and the inner diameter of the base diameter-changing section decreases along the direction from the base access section to the straight access section.

[0007] The microcatheter includes a straight section and a flared section, and the port diameter of the flared section is not less than the port diameter of the straight access section.

[0008] Preferably, the microcatheter is of an integrally formed structure.

[0009] Preferably, a PTFE film layer is arranged inside the microcatheter.

[0010] Preferably, the microcatheter and the base are fixedly connected by UV glue.

[0011] Compared with the prior art, the beneficial effects of the utility model are as follows: The microcatheter of the utility model has a flared section, which can allow the protective sheath to extend into the proximal end of the microcatheter, reducing the influence of the connection between the microcatheter base and the microcatheter on the integrity of the drug coating;

[0012] A PTFE film layer is arranged inside the microcatheter, which can improve the integrity of the drug coating on the drug-eluting stent. Description of the Drawings

[0013] Figure 1This is a cross-sectional view of the present utility model.

[0014] Explanation of reference numerals in the drawings:

[0015] 1 - Base, 2 - Microcatheter, 3 - Base access section, 4 - Base reduced-diameter section, 5 - Straight access section, 6 - Straight section, 7 - Flared section, 8 - PTFE film layer. Specific embodiments

[0016] The following combines the drawings to describe in detail a specific embodiment of the present utility model. However, 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 microcatheter assembly for delivering a self-expanding intracranial drug-eluting stent provided by an embodiment of the present utility model includes a microcatheter 2 and a base 1. The microcatheter 2 is fixedly connected to the base 1. The base 1 has an access end and a connection end. The inner diameter of the access end is greater than that of the connection end. The connection end is butt-jointed with the proximal end of the microcatheter 2 and the inner diameter of the connection end is not greater than that of the proximal end.

[0018] Specifically, the base 1 includes a base access section 3, a base reduced-diameter section 4, and a straight access section 5 that are connected in sequence. The base reduced-diameter section 4 communicates with the base access section 3 and the straight access section 5. The inner diameter of the base reduced-diameter section 4 decreases along the direction from the base access section 3 to the straight access section 5.

[0019] The microcatheter includes a straight section 6 and a flared section 7. The port diameter of the flared section 7 is not less than the port diameter of the straight access section 5. In this embodiment, taking the port diameter of the flared section 7 being greater than the port diameter of the straight access section 5 as an example, when the base and the microcatheter are not coaxial due to installation errors, the protective sheath of the drug-eluting stent can also extend into the flared section 7 of the microcatheter 2 (here referring to the case where the deviation value is small).

[0020] The design of the flared section 7 can enable the protective sheath to extend into the proximal end of the microcatheter 2, reducing the influence of the connection between the microcatheter base and the microcatheter on the integrity of the drug coating.

[0021] In some embodiments, the microcatheter is an injection-molded integral structure. Of course, it can also be integrally formed by 3D printing.

[0022] In some embodiments, to reduce the friction between the drug-eluting stent and the inner wall of the microcatheter, a PTFE film layer 8 is provided inside the microcatheter, which can improve the integrity of the drug coating on the drug-eluting stent.

[0023] In some embodiments, the microcatheter and the base are fixedly connected by UV glue curing.

[0024] 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 the present utility model can be implemented in other specific forms without departing from the spirit and basic characteristics of the present utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. 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.

[0025] In addition, it should be understood that although this specification is described in terms of embodiments, not every embodiment only contains an independent technical solution. This narrative manner 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 microcatheter assembly for delivering a self-expanding intracranial drug-eluting stent, characterized in that: The micro-catheter comprises a base, wherein the base comprises an access end and a connection end, wherein the inner diameter of the access end is larger than the inner diameter of the connection end, and the connection end is butted with the proximal end of the micro-catheter and the inner diameter of the connection end is not larger than the inner diameter of the proximal end.

2. The self-expanding intracranial drug-eluting stent delivery microcatheter assembly according to claim 1, characterized in that: The base comprises a base access section, a base diameter reducing section, and a flat access section which are connected in sequence; The base reducing section is connected to the base access section and the flat access section, and the inner diameter of the base reducing section decreases along the direction from the base access section to the flat access section.

3. The microcatheter assembly for delivering a self-expanding intracranial drug-eluting stent according to claim 2, characterized in that: The micro-catheter comprises a straight section and a flared section, and the port diameter of the flared section is not less than the port diameter of the straight entry section.

4. The microcatheter assembly for delivering a self-expanding intracranial drug-eluting stent according to claim 1, characterized in that: The microcatheter is an integrally formed structure.

5. The microcatheter assembly for delivering a self-expanding intracranial drug-eluting stent according to claim 1, characterized in that: A PTFE film layer is arranged in the micro-catheter.

6. The microcatheter assembly for delivering a self-expanding intracranial drug-eluting stent according to claim 1, characterized in that: The micro-catheter and the base are connected by curing with UV glue.

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