Prosthesis (i.e. – artificial body members) – parts thereof – or ai – Arterial prosthesis – Stent structure
Patent
1993-10-01
1996-07-16
Brittingham, Debra S.
Prosthesis (i.e., artificial body members), parts thereof, or ai
Arterial prosthesis
Stent structure
623 12, 606195, 606194, A61F 206, A61F 204, A61M 2902
Patent
active
055362745
DESCRIPTION:
BRIEF SUMMARY
The invention relates to implants for organ pathways, preferably for blood vessels, whose secondary shape is formed either from a primary wire spiral made of metal or a primary tube made of synthetic material by twisting or winding, the secondary shape being extended for introduction and being reformed in association with placement in the organ.
In interventional radiology, metal spirals for vessel occlusion have, for more than 10 years, been implanted using catheters. Spirals of this type are described repeatedly in the literature. In Radiology 136;230-231 (July 1980), W. Castaneda-Zuniga et al. describe an improved form of the so-called Gianturco spirals, which can be introduced using catheters made of polyurethane or polyethylene. The primary spiral is formed by appropriate techniques into a ball or a secondary spiral. In order to be able to implant the spiral in its secondary shape, the latter is extended by drawing up the primary spiral onto a guide wire. When implanting by means of a catheter on the guide wire, a further displaceable spiral is arranged on the guide wire, which spiral serves to push the implant, i.e. the primary spiral, out of the catheter and to push it off from the guide wire, so that the secondary shape is reformed and the secondary spiral or the ball remains in the vessel which is to be occluded.
In Am. J. Roentgenol. 129:795-798 (November 1977) J. Anderson, S. Walace and C. Gianturco describe the advantages of being able to replace the spiral before finally casting it off. However, their helical corkscrew connection has the disadvantage that there is the danger of the vessel being perforated by the sharp end of the spiral. In addition, the spiral can be displaced by rotation while disconnecting. This is also suggested by the numerous complications in the animal experiments.
In Radiology 138;37-46 (January 1981), M. J. Mazer and coworkers describe the disadvantages of the known technique and refer to failures arising from incorrect choice of the size of the secondary spiral and to the risks of using unsuitable stripping devices.
A device for occluding arteries is described in DD-A-223 065, which device comprises a cardiac or angiographic catheter, with a prepared point, a pushing element (pusher), an occluding body and a core wire, on the front end of which wire the occluding body is slid on and is detachably secured. The core wire runs movably in the interior of the pushing element and can be introduced, together with the slid-on occluding body and the pushing element, beyond the opening of the catheter further into the artery in such a way that the occluding body remains on the core wire and is also conveyed by this wire outside of the catheter. By keeping a firm hold on the core wire and by further pushing of the pushing element, the occluding body can be stripped off the core wire. This can take place by retracting the core wire into the pushing element. The occluding body is provided with a textile fibre material over its whole length and over its whole periphery. It possesses a sleeve-shaped part at its posterior end into which the core wire can be introduced in such a way that the occluding body can be detached efficiently from the core wire using the pushing element.
An occluding body suitable for the intra-arterial and intravenous occlusion of blood vessels, is known from DD-A-158 084, in which occluding body a wire spiral is formed, with the use of relatively high degrees of deformation, into a helical spring body, such that the spring body, on the application of an external force, can be elastically reformed into a straight wire spiral and, on partial cessation of this force, assumes a knot-shaped configuration.
It is the object of the present invention to improve the constructional configuration of the implants in such a way that the possibility exists, before finally detaching the implants from the auxiliary means employed for the insertion, of, where appropriate, recovering these implants once again or else altering their position in the organ pathway.
This object is
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Brittingham Debra S.
pfm Produkterfur Die Medizin
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