Blood collecting apparatus and blood-collecting method using blood collecting apparatus

In a blood collecting apparatus comprising:

• a blood collecting needle for collecting blood from a donor;
• a blood collecting bag for accommodating collected blood;
• a first duct whose one end communicates with said blood collecting bag and other end communicates with said blood collecting needle, and introducing said collected blood into said blood collecting bag;
• a second duct branching from said first duct through a branch portion and having a blood take-out port;
• and
• a pressure buffering means for suppressing fluctuation of a pressure of said second duct.

A blood collecting method to be carried out by using a blood collecting apparatus comprising:

• a blood collecting needle for collecting blood from a donor;
• a blood collecting bag for accommodating collected blood;
• a first tube whose one end communicates with said blood collecting bag and other end communicates with said blood collecting needle;
• a branch portion provided on a portion of said first tube;
• a second tube connected with said branch portion at one end thereof and having a blood take-out port at the other end thereof;
• and a flexible resin bag and having a third tube communicating with said second tube,
• said blood collecting method comprising the steps of:
• piercing a blood collecting needle into a donor when a portion of said first tube positioned between said branch portion and said blood collecting bag is sealed;
• removing air inside said first and second tubes by introducing an initial flow blood from said donor into a portion of said first tube between said blood collecting needle and said branch portion and into said second tube and by accommodating air inside said portion of the first tube positioned between said blood collecting needle and said branch portion and air inside said second tube in said flexible resin bag;
• and
• collecting a predetermined amount of blood from said donor in said blood collecting bag by intercepting communication between said first tube and said flexible resin bag and by communicating said portion of said first tube between said blood collecting needle and said branch portion with a portion of said first tube between said branch portion and said blood collecting bag.

A blood collecting method to be carried out by using a blood collecting apparatus comprising a blood collecting needle for collecting blood from a donor;

• a blood collecting bag for accommodating collected blood;
• a first tube whose one end communicates with said blood collecting bag and other end communicates with said blood collecting needle;
• a branch portion provided on a portion of said first tube;
• a second tube connected with said branch portion at one end thereof and having a blood take-out port at the other end thereof;
• and a filter gas-permeable and blood-unpermeable and communicable with an interior of said second tube,
• said blood collecting method comprising the steps of:
• piercing a blood collecting needle into a donor when a portion of said first tube positioned between said branch portion and said blood collecting bag is sealed;
• exhausting air inside said first and second tubes from said filter by introducing an initial flow blood from said donor into a portion of said first tube between said blood collecting needle and said branch portion and into said second tube;
• collecting a predetermined amount of blood from said donor in said blood collecting bag by intercepting communication between said first tube and said filter and by communicating said portion of said first tube between said blood collecting needle and said branch portion with a portion of said first tube between said branch portion and said blood collecting bag.

A blood collecting apparatus comprising:

• a blood collecting needle for collecting blood from a donor;
• a blood collecting bag for accommodating collected blood;
• a first tube having one end communicating with said blood collecting bag and another end communicating with said blood collecting needle;
• a first branch portion provided on a portion of said first tube;
• a second tube having one end connected with said first branch portion and having a second branch portion provided on a portion of said second tube,
• a blood take-out port communicating to one branch port of the second branch portion;
• a third tube having one end connected with another branch port of said second branch portion,
• a filter gas-permeable and blood-unpermeable and provided on said third tube;
• and
• a duct-sealing member provided on said third tube and positioned in a region between said second branch portion and said filter and adapted to intercept a duct inside said third tube.