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Counter pressure device for ophthalmic drug delivery

  • US 7,402,156 B2
  • Filed: 08/18/2005
  • Issued: 07/22/2008
  • Est. Priority Date: 09/01/2004
  • Status: Expired due to Fees
First Claim
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1. A counter pressure device for minimizing drug reflux during ophthalmic drug delivery with a cannula, comprising:

  • a handle;

    a head coupled to a distal end of said handle, said head comprising a curved, concave surface for contacting a conjunctiva and a notch centrally disposed on said curved, concave surface for removably receiving a cannula, wherein;

    said head is made of silicone;

    said curved, concave surface has a radius of curvature of about 10 mm to about 14 mm and a thickness of about 1.2 mm to about 3 mm;

    said notch has a radius of curvature of about 0.2 mm to about 1 mm; and

    a portion of said curved, concave surface outside of said notch is formed with a slippage preventing texture comprising a plurality of knurls, each of said knurls having a pyramidal geometry.

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