Prosthesis (i.e. – artificial body members) – parts thereof – or ai – Arterial prosthesis – Stent structure
Patent
1992-05-22
1994-07-19
Isabella, David
Prosthesis (i.e., artificial body members), parts thereof, or ai
Arterial prosthesis
Stent structure
623 12, 606194, A61F 206
Patent
active
053305280
DESCRIPTION:
BRIEF SUMMARY
The invention is concerned with improvements in or relating to devices suitable for use in vascular surgery, particularly but not exclusively for use in substitution for or replacement of a damaged or malformed region of vessel or other conduit normally adapted to carry a fluid flow in mammals.
As an example of such damaged or deformed vessels, it has apparently become increasingly common over recent years for patients to suffer dilatation or sacculation of arteries, especially the aorta, to produce aneurysms which are liable to rupture. Unless suitably prompt surgery is performed, the condition is fatal. Another condition which requires surgical attention is the correction of blood flow irregularities caused by fistulae resulting from congenital deformity or from damage occurring to organs and blood vessels. In each of these two examples one of the immediate requirements is to restore a through-flow of fluid through the vessel so that fluid-pressure is not lost through leakage or other unwanted passage from the vessel.
It has generally been considered advantageous to prepare for surgery to repair or replace a region of a damaged vessel by blocking the flow of fluid to the vessel at a point slightly upstream of the region. While it is feasible in some circumstances as part of the surgical procedure to arrange an external by-pass conduit for the fluid flow during the repair procedure, in others this is virtually impossible to achieve.
While aneurysms may occur at any region of the aorta, those situated below the diaphragm, i.e. the abdominal aortic aneurysms, give the most pressing instances in which urgent surgery should be carried out if the patient is to survive. Nevertheless the general condition of the patient will probably be at a poor level due to deep shock associated with blood loss, anuria and/or low blood pressure.
It is one of the objects of the invention to provide an internal by-pass arrangement capable of maintaining, in the short, medium or long term, a fluid flow normally carried by a region of vessel or conduit rendered more or less incapable of carrying such flow.
It is another object of the invention to provide an insertion device adapted for use to connect two portions of a sound fluid flow passageway which flank a damaged or otherwise unsound region of said passageway.
The invention provides a surgical device suitable for insertion into a body fluid passageway to span a damaged or deformed portion thereof by forming communication between two relatively sound portions of said passageway spaced apart by the intervening damaged or deformed region of the passageway, said device comprising a substantially tubular body portion having open end portions, and an outer sleeve member secured at one end thereof to the body portion adjacent to one of said open end portions and secured at the other end thereof to the body portion adjacent the second of said Open end portions so as to define an annular outer chamber around said body portion, said outer sleeve member being formed from flexible material in order to allow inflation of said annular outer chamber, the body member comprising a tubular wall arrangement adapted to be in an inoperative, flaccid, condition immediately before use, means being provided for rendering the flaccid wall arrangement into a relatively rigid condition when the device is in position for use within the body fluid passageway, means also being provided for the concomitant comprising a tubular wall arrangement adapted to be in an inoperative, flaccid, condition immediately before use, means being provided for rendering the flaccid wall arrangement into a relatively rigid condition when the device is in position for use within the body fluid passageway.
The invention provides, in another of its several aspects, a surgical device suitable for insertion into a body fluid passageway to span a damaged or deformed portion thereof by forming communication between two relatively sound portions of said passageway spaced apart by the intervening damaged or deformed region of the pass
REFERENCES:
patent: 3435824 (1969-04-01), Gamponia
patent: 4183102 (1980-01-01), Guiset
patent: 4705517 (1987-11-01), DiPisa, Jr.
patent: 5156620 (1992-10-01), Pigott
patent: 5171261 (1992-12-01), Noishiki et al.
British Technology Group Limited
Brittingham Debra S.
Isabella David
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