implanted device is provided with mechanically mov- the respective arterial or venous passage and an oppo
able valve members. These valve members are normally site end adapted to be connected with a respective main
retained in a position within housings provided by the femoral artery or vein side wall in communicating rela
shunt device which maintain the valve members out of tion respectively with the respective interior of the
communicating relation with the blood flow through 5 femoral artery or vein.
the shunt device. The valve members are provided with The elastomeric body is provided with means extendcooperating! surfaces such as square apertures or threads ing from two spaced positions exterior of said elastowhich are operable to initially establish a fluid-tight meric body inwardly thereof to two positions in corncommunication with a hollow needle. The hollow nee- municating relation respectively with the arterial and die is thus capable of being inserted through the skin 10 venous passages operable to move in response to the into fluid contact with the valve member and then after insertion of a cannula-trocar assembly from (1) a closed such fluid coupling has been effected, the hollow needle condition excluding fluid containing space within the is capable of effecting the movement of the valve mem- body between the respective two positions so that blood ber into flow communicating relation with the blood- flowing from the arterial tube through the arterial passtream. 15 sage will pass therefrom through the bypass conduit While the patent describes the utilization of a Fogarty into the venous passage and out of said venous tube (2) catheter for effecting the cleaning and declotting of the an open condition excluding fluid receiving space device, no provision is made for preventing the clotting within the body from the exterior periphery of the porof the blood within the central flow passages of the tions of the respective cannula extending between the valve members when they are disposed in their normal 20 two respective positions each of which also extends closed positions. Moreover, while provision is made for percutaneously and in communicating relation with the circulating blood between the periphery of the valve respective arterial or venous passage so that blood flowmembers and the housing retaining the same when the ing from the arterial tube through the arterial passage valve members are in their opened position, no such will flow through the bypass conduit as aforesaid and, provision is made for the valve members when they are 25 in addition, will also flow into the blood withdrawing in closed position and, indeed, the peripheral passages cannula (with its trocar removed), through the extraprovided for continued flow when the valve members corporeal flow path, through the blood returning canare open are themselves closed when the valve member nula (with its trocar removed), back into the venous is closed, thus presenting, along with the interior pas- passage.
sages of the valve members, spaces where blood would 30 A further object of the present invention is the provi
be trapped and become clotted. sion of an implant device of the type described which is
While it is recognized to be desirable to overcome the simple in construction, economical to manufacture and
disadvantages of the commercially available exterior- effective in operation.
ized shunt device, the arrangement disclosed in the Another object of the present invention is the proviaforesaid patent would appear to present clotting prob- 35 sion of cannula-trocar assemblies particularly conlems equal to, if not worse than the clotting problems structed to cooperate with such implant, which cannoted in the prior art. When it is considered that it is nula-trocar assemblies are simple in construction, ecoquite usual for cancer patients to be hypercongulable, nomical to manufacture and effective in operation, the clotting problems of the prior art assume greater These and other objects of the present invention will proportions when contemplating the utilization of such 40 become more apparent during the course of the followshunts for hyperthermic treatment of a patient for anti- ing detailed description and appended claims, cancer purposes. Moreover, effective hypertharmic The invention may best be understood with reference treatments in accordance with the principles of the to the accompanying drawings,-wherein an illustrative present invention require flow rates considerably in embodiment is shown, excess of that normally provided for kidney dialysis. 45 In the drawings:
Accordingly, it is a further object of the present in- FIG. 1 is a perspective view illustrating the method
vention to provide a shunt device of the totally subcuta- and apparatus embodying the principles of the present
neous type which is particularly suitable for use in hy- invention;
perthermic treatment of a patient for anti-cancer pur- FIG. 2 is an enlarged vertical sectional view taken
poses in accordance with the present invention, which 50 along the line 2-13 2 of FIG. 1;
device overcomes, or at least substantially alleviates, FIG. 3 is a plan view of the implant part of the appa
the clotting problems of the prior art heretofore noted. ratus;
This objective is obtained by providing a totally sub- FIG. 4 is a longitudinal section taken along the line
cutaneous implant for use with the apparatus providing 4—4 of FIG. 3;
the extracorporeal blood flow path, including both a 55 FIG. 5 is an end view of the implant shown in FIG.
blood withdrawing and a blood returning percutaneous 3;
cannula, each of which is cooperable with a trocar for FIG. 6 is an enlarged, fragmentary sectional view
effecting the percutaneous disposition thereof, which illustrating the entry of the blood withdrawing cannula
cannulas cooperate with the implant to achieve the with its cooperating trocar assembled therein into coop
extracorporeal blood flow. The implant comprises a 60 erating relation with the implant and specifically the
body of elastomeric material adapted to be implanted arterial passage thereof;
totally subcutaneously in a femoral extremity, the body FIG. 7 is an enlarged fragmentary sectional view
having an arterial passage therein, a spaced venous taken along the line 7—7 of FIG. 1;
passage, and a bypass conduit extending from one end FIG. 8 is a top plan view of the blood withdrawing
of the arterial passage to one end of the venous passage. 65 cannula with its cooperating trocar assembled therein;
An arterial tube and a venous tube of vascular prosthe- FIG. 9 is side view of the cannula shown in FIG. 8;
sis material are provided, each having one end con- FIG. 10 is an end view of the cannula shown in FIG.
nected in communicating relation with the other end of 8; and