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Valving slit construction and cooperating assembly for penetrating the same

  • US 4,447,237 A
  • Filed: 05/07/1982
  • Issued: 05/08/1984
  • Est. Priority Date: 05/07/1982
  • Status: Expired due to Term
First Claim
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1. In an implant for use with an apparatus providing an extracorporeal blood flow path extending from a blood withdrawing cannula cooperable with said implant to a blood returning cannula cooperable with said implant, said implant comprising a body of elastomeric material having means therein defining an arterial passage, a spaced venous passage, and a bypass conduit extending from one end of said arterial passage to one end of said venous passage, arterial inlet means for connecting said arterial passage in communicating relation with the interior of an artery, venous outlet means for connecting said venous passage in communicating relation with the interior of a vein, outlet valving slit means in said elastomeric body movable between (1) a closed condition so that blood flowing from said arterial inlet means through said arterial passage will pass therefrom through said bypass conduit into said venous passage and out of said venous outlet means and (2) an open condition in sealing relation with the exterior periphery of the portion of a blood withdrawing cannula extending therethrough so that blood flowing from said arterial outlet means through said arterial passage will flow through said blood withdrawing cannula and said bypass conduit and inlet valving slit means in said elastomeric body movable between (1) a closed condition so that blood flowing from said bypass conduit will pass therefrom into said venous passage and out of said venous outlet means, and (2) an open condition in sealing relation with the exterior periphery of the portion of a blood returning cannula extending therethrough so that said venous passage will receive blood flowing both from said blood returning cannula and said bypass conduit, the improvement which comprises each valving slit means comprising:

  • flattened sleeve means of vascular prosthesis material within said elastomeric body presenting opposed interior surfaces interengaged when said valving slit means is in said closed condition and spaced apart when said valving slit means is in said open condition, andmeans operable in addition to the bias provided by the elastomeric material of said body for yieldably biasing the opposed surfaces of said flattened sleeve means into sealed relation when in said closed interengaged condition and into sealed relation to the exterior periphery of the portion of the cannula extending therethrough when in said open spaced apart condition, said additional biasing means including cavity means having a yieldable material under pressure therein so located with respect to said flattened sleeve means as to transmit the pressure thereof as the additional bias of the opposed surfaces into sealed relation when in said closed interengaged condition and into sealed relation with the exterior periphery of the cannula when in said open spaced apart condition.

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