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Immunoassay or diagnostic device and method of manufacture

  • US 4,978,502 A
  • Filed: 12/15/1987
  • Issued: 12/18/1990
  • Est. Priority Date: 01/05/1987
  • Status: Expired due to Fees
First Claim
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1. A hand held assay device comprising:

  • a housing means,a movable transport means within the housing means,at least one liquid container within said housing means,said container comprising a molded, flexible blister having an open side,closure means spanning said open side to close and seal said blister,punch means molded integrally with said blister defining with said blister a single, unitary, seamless piece part,said punch means defining a cone having a base, a lateral surface and an apex,the lateral surface of said cone being interrupted by a plurality of grooves of varying depth extending from said base to said apex,the depth of said grooves being greatest at the base of said cone graduating to zero depth at the apex, andsaid cone being operable in response to deformation of the blister to rupture the closure means whereby said cone, by virtue of said grooves, is operable to release liquid from said container in a predictable manner.

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