Blood-drawing device
A blood-drawing device has a specimen tube having a projecting tip having an outer connection region of a predetermined diameter and a guide sleeve fittable over the tip and having an inner resilient part. The inner resilient part has an inside diameter smaller than the diameter of the connection region. A needle fitted to the guide sleeve is surrounded by an elastomeric tubular needle shield inward from the guide sleeve. The sleeve can move between an outer position with the needle shield extending inward past the inner needle end and the resilient part offset outward from the connection region and an inner position with the needle end in the specimen tube, the needle shield compressed between the sleeve and the specimen tube, and the resilient part fitting tightly around the connection region and deformed outwardly thereby such that the resilient part grips the connection region.
1. A blood-drawing device comprising:
a specimen tube having a projecting tip having an outer side surface forming a connection region of a predetermined diameter;
a guide sleeve fittable over the tip and unitarily formed with a generally cylindrical thick and generally rigid outer grip part of predetermined diameter and a thin inner resilient, generally cylindrical, and radially deformable part, the inner resilient part having an inside diameter smaller than the predetermined diameter of the connection region and generally the same as the predetermined diameter of the outer grip part, the inner part being an axial extension of the outer part;
a needle fitted to the guide sleeve and having an inner end; and
an elastomeric tubular needle shield surrounding the needle inward from the guide sleeve, the sleeve being movable between
an outer position with the inner needle end out of the specimen tube, the needle shield extending inward past the inner needle end, and the resilient part offset outward from the connection region and
an inner position with the inner needle end traversing the shield and projecting inward into the specimen tube, the needle shield compressed between the sleeve and the specimen tube, and the resilient part fitting tightly around the connection region and deformed outwardly thereby such that the resilient part grips the connection region.
2. The blood-drawing device defined in claim 1 wherein the specimen tube, sleeve, needle, and needle shield are all generally coaxial.
3. The blood-drawing device defined in claim 2 wherein the connection region is annular and radially outwardly directed.
4. The blood-drawing device defined in claim 3 wherein the inner resilient part is annularly continuous and elastically deformable.
5. The blood-drawing device defined in claim 3 wherein the inner resilient part is formed with a plurality of axially inwardly open slots subdividing the resilient part into a plurality of axially extending and radially elastically deformable fingers.
6. The blood-drawing device defined in claim 3 wherein the connection region is smooth and the resilient part has a complementary smooth inner surface.
7. The blood-drawing device defined in claim 3 wherein the connection region is frustoconical.
8. The blood-drawing device defined in claim 3 wherein the connection region is formed with an annular and radially outwardly projecting ridge.
9. The blood-drawing device defined in claim 3 wherein the outer grip part is tubular.