×

Dialysis membrane of cellulose in the shape of a hollow fiber, and process for the production thereof

  • US 4,933,084 A
  • Filed: 01/11/1985
  • Issued: 06/12/1990
  • Est. Priority Date: 10/02/1978
  • Status: Expired due to Fees
First Claim
Patent Images

1. A dialysis membrane comprising cellulose regenerated from a copper-ammonia solution, and shaped as an elongated hollow fiber possessing a longitudinal fiber axis, a continuous hollow cavity and a closed wall with an outer wall surface which forms an outer side of the fiber and an inner wall surface which defines the limits of the continuous hollow cavity, the fiber being formed so that the difference of the distance to the outer wall surface and the distance to the inner wall surface, each measured from a fiber midpoint which is a midpoint of a smallest circle surrounding a fiber cross-section normal to the fiber axis, vary along a fiber periphery when viewed in the fiber cross-section normal to the fiber axis, whereby the fiber cross-section normal to the fiber axis possesses a shape of a circle, the fiber being formed so that a wall thickness of the hollow fiber along its periphery at least once continuously increases to a maximum wall thickness and decreases to a minimum wall thickness, a wall thickness measured between said outer wall surface and said inner wall surface of the hollow fiber so decreases that said outer wall surface and said inner wall surface form substantially two circles and midpoints of both these circles lie eccentric to each other.

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