Patent ID: 7798978

Claim:
A body fluid collecting device comprising: a device body comprising an interior space and a forward end at which is located a contact part against which skin is to be pressed; a tip positioned in the interior space of the device body, the tip comprising a housing and a puncture needle, the puncture needle being positioned in the housing, the housing possessing a front end opening through which the puncture needle of the tip is adapted to pass, the front end opening being located at a front end portion of the housing, the contact part of the device body surrounding the front end opening at the front end portion of the housing, the front end opening of the housing being sealed when the skin is pressed against the contact part; a first tip mounting part movably positioned in the interior space of the device body to move in a longitudinal direction, the first tip mounting part comprising a cylindrical portion possessing a forward end at which is provided an opening, the cylindrical portion also possessing a rearward end portion at an end of the cylindrical portion opposite the forward end, the cylindrical portion surrounding a storage space configured to removably receive the housing and the puncture needle, the storage space communicating with the front end opening of the housing; a second tip mounting part movably positioned in the interior space of the device body to move in the longitudinal direction, the second tip mounting part comprising a cylindrical portion, the rearward end portion of the cylindrical portion of the first tip mounting part being movably positioned in the cylindrical portion of the second tip mounting part so that the first and second tip mounting parts are relatively movable in the longitudinal direction; depressurizing means for depressurizing the storage space surrounded by the cylindrical portion of the first tip mounting part; a spring applying a biasing force to both the first tip mounting part and the second tip mounting part to urge the first and second tip mounting parts away from one another in the longitudinal direction when the depressurizing means is not operating; and a seal member directly contacting both the first and second tip mounting parts to maintain air-tightness of the storage space, the first and second tip mounting parts being movable toward each other along the longitudinal direction against the biasing force of the spring by depressurization of the storage space during operation of the depressurizing means.