Prosthesis (i.e. – artificial body members) – parts thereof – or ai – Corporeal artificial heart – heart assist – control...
Patent
1988-10-14
1990-06-26
Green, Randall L.
Prosthesis (i.e., artificial body members), parts thereof, or ai
Corporeal artificial heart, heart assist , control...
A61F 222
Patent
active
049368575
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates generally to medicine, more specifically to prosthetic organs of the human body and has particular reference to a prosthetic pericardium.
PRIOR ART
Known in the present state of the art is pery-guard the prosthetic pericardium which is in effect a rectangular flap made of the tissue of a bovine pericardium treated appropriately to eliminate the antigenic properties.
The known prosthetic pericardium is employed as patches for closure of a defect of the natural pericardium after surgery on the heart. However, such a patch fails to cover the entire heart and hence adhesions are liable to occur. Moreover, the heterotransplant of a bovine pericardium is rejected by the organism, and calcinosis is thus developed.
One more state-of-the-art prosthetic pericardium is known to comprise sheaths from a biologically neutral elastic material made to suit the heart's dimensins and provided with a means for its being fixed on the heart (SU, A, 1,009,457).
The sheath is shaped to suit the heart's shape and is open on the side of the base of the heart. A number of perforations are made in the sheath over the entire surface thereof. The fixation means of the known prosthetic pericardium is shaped as straps situated on the side of the open sheath end. Once the surgery on the heart has been completed the heart is placed in the hollow space formed by the sheath of the prosthetic pericardium, the aortic arch is encompassed by the straps passed through the transverse sinus, and the ends of the straps are stitched to the edge of the sheath. After the aforesaid manipulations have been completed the sheath of the prosthetic pericardium is reliably fixed on the heart so as to cover the entire surface thereof and establish an interposition between the outer cardiac surface and the inner surface of the natural pericardium, thus preventing formation of any adhesions therebetween. The perforations provide for the exchange with biological fluids between the cardiac surface and the pericardial cavity which may contain, e.g., a serous fluid that facilitates sliding of the cardiac walls during the cardiac contraction.
The prosthetic pericardium of such a construction should be selected to suit the heart's size, therefore a great number of standard sizes of the prosthetic pericardium are required to provide proper selection of an optimum variant. Fixation of the prosthetic pericardium on the heart by stitching it to the surface of the straps is inconvenient with the heart beating. Moreover, withdrawal of the prosthetic pericardium upon termination of the postoperative period involves thoracotomy, which renders the procedure more traumatic and leads to the outflow of the pericardial fluid.
DISCLOSURE OF THE INVENTION
It is an object of the invention to provide a prosthetic pericardium of such a construction that would ensure a possibility of withdrawing a prosthetic pericardium from the thoracic cavity without resorting to thoracotomy which renders the procedure less traumatic, prevents the pericardial fluid from flowing out of the natural pericardial cavity, and provides more versatility and convenience in operation.
The essence of the invention resides in a prosthetic pericardium, comprising a sheathing or membrane from a biologically neutral elastic material sized to suit the heart's size and provided with a means for its being fixed on the heart. According to the invention, the sheathing is shaped as a figure-of-eight platelet, one of whose loops has a larger area than the other and is provided with a reed-shaped projection situated at its top. A fixation means is shaped as a guide channel situated along the contour of the platelet so that a tube from an elastic material may reciprocate along said channel, and a flexible cord accommodated in the tube with the possibility of reciprocating with respect to the tube. The ends of the tube and the cord are brought out of the channel on the side of the reed-shaped projection.
To provide more convenient extraaction of the prosthetic pericardium the tube
REFERENCES:
patent: 3371662 (1966-01-01), Heid et al.
patent: 3513836 (1967-09-01), Sausse
patent: 4497074 (1985-02-01), Rey et al.
patent: 4536893 (1987-08-01), Parravicini
patent: 4690134 (1987-09-01), Snyders
Green Randall L.
Iantorno Stephanie L.
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