Serum separating device and apparatus for serum separation

An apparatus for use in serum separation for separating blood into serum and clot by means by centrifugal separation, said apparatus comprising:

• a cylindrical blood collection tube having an opening at one end thereof;
• a cylindrical member, which fits to an opening of said blood collection tube and which has an inner diameter which is slightly smaller than an inner diameter of said opening;
• and
• a movable member, said movable member comprising:
• a member main portion which is inserted into said cylindrical member and which presses against inner walls of said cylindrical member, and
• an annular isolating member which is annular-shaped and fits to an outer circumferential portion of said member main portion;
• wherein:
• said movable member has a specific gravity between that of serum and that of clot;
• and
• said annular isolating member comprises:
• a material possessing elasticity, liquid permeability, and the quality of swelling in response to immersion in liquid.

An apparatus for use in serum separation for separating blood into serum and clot by means of centrifugal separation, said apparatus comprising:

• a blood collection tube formed with a reduced-diameter portion having a reduced inner diameter at an opening of the blood collection tube;
• and
• a movable member, said movable member comprising:
• a member main portion which is inserted into said reduced-diameter portion and which presses against inner walls of said reduced-diameter portion, and
• an annular isolating member which is annular-shaped and fits to an outer circumferential portion of said member main portion;
• wherein:
• said movable member has a specific gravity between that of serum and that of clot, and
• said annular isolating member comprises:
• a material possessing elasticity, liquid permeability, and the quality of swelling in response to immersion in liquid.