×

Magnetic means for withdrawing magnetic gel beads from an assay fluid

  • US 4,649,116 A
  • Filed: 10/29/1984
  • Issued: 03/10/1987
  • Est. Priority Date: 10/27/1983
  • Status: Expired due to Fees
First Claim
Patent Images

1. A magnetic device for withdrawing magnetic gel beads or the like from a biological fluid and transferring the same into an immunoenzymatic assay medium, comprising in combination:

  • a housing of non-magnetic material which is constructed in the form of an insulating handle of said device and in which is formed a traversing orifice over its entire height, said traversing orifice being eccentric with respect to the vertical axis of the housing,a magnetic eccentrically housed in said housing with respect to the vertical axis of this latter,a rod housed in said eccentric traversing orifice, said orifice constituting a guide track for said rod, wherein said rod comprises an upper portion of non-magnetic material and a lower portion of magnetizable material, the latter having two limiting positions, namely a retracted position, in which the magnetizable portion is under the magnetic influence of said magnet so as to exert a magnetic force, and a projected position, in which the magnetizable portion is beyond the magnetic influence of the magnet, and detachable fixing means for fastening said lower magnetizable portion of the rod to said upper non-magnetic portion of said rod such that said lower magnetizable portion is detachable from said upper non-magnetic portion of said rod,manually operable means for bringing said lower magnetizable portion of said rod into said projected position, andspring means for maintaining said lower magnetizable portion of said rod in said retracted position and to move said rod back into said retracted position after releasing said manually operable means.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×