Slide for a microscopic examination of biological fluid

Abstract

A slide for use in microscopic examination of biological fluid is constituted by two plates of transparent material, one plate being a bottom and the other plate being a cover, the plates forming wells which are filled by capillarity with the biological fluid to be examined. A plurality of reliefs form a plurality of computation chambers in each well. The reliefs which define each computation chamber sectioned along a plane perpendicular to the bottom of the well have a shaped section along a profile assimilable to a polygon having at least one right angle.

What is claimed is:  
     
         1 . A slide for use in microscopic examination of biological fluid for a computation of elements in a predefined sample, said slide comprising: 
 a first plate and a second plate of transparent material, said first plate forming a floor and said second plate forming a covering, said plates forming there between at least one well with a bottom; and    a computation chamber defined by a relief extending upwardly from said bottom of said well, said computation chamber having a floor;    wherein: 
 said relief has an internal lateral wall facing said computation chamber and extending from said floor to the upper extremity of said relief; and  
 said floor of said computation chamber and said internal lateral wall of said computation chamber substantially define a right angle.  
   
     
     
         2 . The slide according to  claim 1 , wherein said relief has a cross-section shaped as a polygon.  
     
     
         3 . The slide according to  claim 2 , wherein said internal lateral wall of said computation chamber has a corner at its upper extremity with a radius of curvature of at most 0.002 mm.  
     
     
         4 . The slide according to  claim 3 , wherein said floor of said computation chamber and said internal lateral wall form an angle of said polygon of at most 90°.  
     
     
         5 . The slide according to  claim 1 , wherein said computation chamber has a substantially quadrilateral shape.  
     
     
         6 . The slide according to  claim 1 , wherein said computation chamber has a substantially circular shape.  
     
     
         7 . The slide according to  claim 1 , wherein said relief has a cross-section approximately in the shape of a rectangular trapezium.  
     
     
         8 . The slide according to  claim 1 , wherein said relief has a cross-section approximately in the shape of a right triangle.  
     
     
         9 . A slide for use in microscopic examination of biological fluid for a computation of elements in a predefined sample, said slide comprising: 
 a first plate and a second plate of transparent material, said first plate forming a floor and said second plate forming a covering, said plates forming therebetween at least one well with a bottom; and    a computation chamber formed on said bottom of said well and having a floor, said computation chamber being defined by a relief extending from said bottom of said well, said relief having a side defining an internal lateral wall of said computation chamber;    wherein the entire internal lateral wall of said computation chamber is substantially at a right angle with respect to said floor of said computation chamber.    
     
     
         10 . The slide according to  claim 9 , wherein: 
 said relief has a cross-section shaped as a rectangular trapezium; and    said internal lateral wall of said computation chamber forms the side of the right angle of the rectangular trapezium.    
     
     
         11 . The slide according to  claim 9 , wherein: 
 said relief has a cross-section shaped as a right triangle; and    said internal lateral wall of said computation chamber forms the side of the right angle of the right triangle.    
     
     
         12 . The slide according to  claim 9 , wherein the top of said internal lateral wall is rounded with a radius of curvature of at most 0.002 mm.  
     
     
         13 . The slide according to  claim 9 , wherein: 
 said relief has a cross-section shaped as a polygon with at least one right angle defined by said floor of said computation chamber and said internal lateral wall of said computation chamber.    
     
     
         14 . The slide according to  claim 9 , wherein said relief extends rectilinearly, whereby said computation chamber has a substantially quadrilateral shape.  
     
     
         15 . The slide according to  claim 9 , wherein said relief extends circularly, whereby said computation chamber has a substantially circular shape.