Device for treating a blood circulation canal and process for preparing this device

Abstract

This device comprises a hollow support (13) delimiting, in the vicinity of a distal end (19), a transverse retention opening (23A). It comprises an endoprosthesis (11) which can be deployed between a state retracted against the support (13) and an expanded state. The device comprises a filamentary connection (33A) forming a clamping ring (43) surrounding the endoprosthesis (11) and forming a loop (45) engaged in the support (13) through the retention opening (23A). The device comprises a retention rod (31A) mounted to be movable in the support (13). The retention rod (31A) comprises a hook (35) for retaining the loop (45). The displacement of the retention rod (31A) from a release position to a retention position brings about the tightening of the clamping ring (43).

Description

BRIEF DESCRIPTION OF THE FIGURES

The invention will be better understood on reading the following description which is given purely by way of example and with reference to the appended drawings in which:

FIG. 1 is a front view of a first treatment device according to the invention, the endoprosthesis being maintained in its retracted state;

FIG. 2 is a sectioned view, taken on the centre transverse plane II-II, of a detail of FIG. 1;

FIG. 3 is a view analogous to FIG. 1, the endoprosthesis being in its expanded state;

FIG. 4 is a view analogous to FIG. 2 of the endoprosthesis of FIG. 3;

FIG. 5 is a three-quarter perspective view, from the front, of the endoprosthesis of the device of FIG. 1 in its expanded state;

FIG. 6 is a view analogous to FIG. 2 of a detail of a second treatment device according to the invention;

FIG. 7 is a view analogous to FIG. 6 of a third device according to the invention;

FIG. 8 is a view analogous to FIG. 6 of a fourth device according to the invention, the endoprosthesis not being shown; and

FIG. 9 is a view analogous to FIG. 5 of the endoprosthesis of the device of FIG. 8.

Claims

1. Device for treating a blood circulation canal, of the type comprising: a hollow support delimiting, in the vicinity of a distal end, at least one transverse retention opening;an endoprosthesis which can be deployed between a state retracted against a lateral surface of the support and an expanded state in which the endoprosthesis can be released from the support;at least one filamentary connection forming a clamping ring surrounding the endoprosthesis and forming a loop engaged in the support through the retention opening;the clamping ring being extensible between a configuration for maintaining the endoprosthesis in its retracted state and a configuration for deploying the endoprosthesis; and, for the or each filamentary connection,a retention rod which is mounted to be movable in the support between a position for retaining the loop and a position for releasing the loop;wherein the retention rod comprises at least one hook for retaining the loop, the displacement of the retention rod from its release position to its retention position bringing about the tightening of the clamping ring from its configuration for deploying the endoprosthesis to its configuration for maintaining the endoprosthesis.

2. Device according to claim 1, wherein the hook is placed at a distal end of the retention rod.

3. Device according to claim 1, wherein the hook delimits, on the retention rod, a distal section of non-zero length and a proximal section, the hook projecting transversely relative to the distal section and to the proximal section

4. Device according to claim 1, wherein the endoprosthesis delimits, for the or for each filamentary connection, a guide passage for the filamentary connection, the ends of the clamping ring being engaged in the guide passage.

5. Device according to claim 4, wherein the or each filamentary connection is a strand which is closed on itself, the loop being formed by an extension of the clamping ring extending from the guide passage between the ends of the clamping ring.

6. Device according to claim 1, wherein the or each filamentary connection is mounted permanently on the endoprosthesis.

7. Device according to claim 1, wherein the support delimits a proximal retention opening and a distal retention opening, the device comprising, for each retention opening, a separate retention rod comprising a retention hook.

8. Device according to claim 1, wherein the support delimits a proximal retention opening and a distal retention opening, the device comprising a common retention rod comprising a distal hook and a proximal hook.

9. Device according to claim 1, wherein the endoprosthesis is mounted coaxially on the support.

10. Device according to claim 1, wherein the or each filamentary connection is releasable from the endoprosthesis, the retention rod comprising means for retaining at least one retention section of the filamentary connection which is separate from the loop, the section being retained by the retention means when the loop is released from the retention hook, in order to permit the joint displacement of the filamentary connection and the retention rod.

11. Device according to claim 10, wherein the retention section of the filamentary connection forms an auxiliary loop engaged in the support through a retention opening, the retention rod comprising an auxiliary hook for retaining the auxiliary loop, which hook opens proximally relative to the hook for retaining the loop.

12. Process for preparing a device according to claim 1, before it is implanted in a blood circulation canal, wherein it comprises the following steps: (a) preservation of the endoprosthesis in its expanded state, the or each loop being engaged in a hook of a rod for retaining the loop;(b) displacement of the retention rod from its release position to the position for retaining the loop, in order to bring about the tightening of the clamping ring and to bring the endoprosthesis into its retracted state.