Surgery – Truss – Pad
Patent
1989-08-04
1991-07-23
Hafer, Robert A.
Surgery
Truss
Pad
128763, 604411, 604413, 604415, A61B 500
Patent
active
050334760
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a blood collecting tube used for blood collection or the like.
BACKGROUND ART
A blood collecting tube of the type shown in FIG. 7 has heretofore been used for blood collection which is typically performed in clinical or biochemical testing. FIG. 7 is a cross-sectional view of a conventional type of blood collecting tube before use while FIG. 8 is a cross-sectional view of the same blood collecting tube after use. In the general form of usage, the blood collecting tube is combined with a holder 12 provided with a needle 16 having opposite sharp-pointed ends.
As shown in FIG. 7, s blood collecting tube 10 includes a tubular body 11 and a plug 14 fitted into the opening of the tubular body 11. In general, the tubular body 11 is formed of a material such as glass or a transparent resin, and the plug 14 is made of a rubber material such as vulcanized butyl rubber. The pressure inside the tubular body 11 is maintained in a reduced state. It is possible to stick a hollow needle into the plug 14 as described later and, the addition, it is necessary to maintain the liquid-tightness of the blood collecting tube 10 by stopping up the needle hole which may remain after the hollow needle has been extracted therefrom. In this respect, it has hitherto been considered suitable to use the plug 14 made of a sealing material such as rubber.
On the other hand, a blood collecting holder 12 has a cylindrical holder body 15 which is open at its lower end, and a hollow needle 16 is attached to the upper end portion of the holder body 15. Attachment of the needle 16 is performed by screwing a hub 17 of the needle 16 onto a threaded portion 18 which is formed on the upper end portion of the holder body 15. The forward end 16A of the needle 16 is provided with a shart-pointed end which is so formed as to pierce the skin while the rearward end 16B of the needle 16 is provided with a sharp-pointed end capable of piercing the plug 14 attached to the tubular body 11. In addition, the rearward end 16B is enclosed in a sheath-like resilient body; for example, a rubber tip 19.
In a case where blood is to be collected using the blood collecting tube 10 and the blood collecting holder 12 each having the aforesaid construction, the forward end 16A of the needle 16 secured to the holder 12 is first stuck into a blood vessel. The blood collecting tube 10 is then inserted into the holder body 15. As shown in FIG. 8, at this time, the needle 16 is stuck through the rubber tip 19 and then into the plug 14 fitted into the blood collecting tube 10, and thus the hollow needle 16 is stuck at its rearward end 16B into the interior of the tubular body 11 having a reduced level of internal pressure. In this state, the rubber tip 19 is collapsed in a bellows-shaped form in the space between the plug 14 and the holder body 15. In consequence, it becomes possible to introduce blood through the forward end 16A of the hollow needle 16 toward the rearward end 16B thereof owing to the fact that the internal pressure of the blood collecting tube 10 is maintained in a reduced state. The thus-introduced blood is allowed to flow into the blood collecting tube 10 and this completes the blood collection.
When a predetermined amount of blood is collected in the interior of the blood collecting tube 10, the blood collecting tube 10 is removed from the holder 12 in the direction indicated by an arrow B (refer to FIG. 8). In this state, the shape of the rubber tip 19 is restored to its original form. If an additional quantity of blood is to be collected, a new tubular body 11 may be inserted into the holder body 15. After completion of the blood collection, the blood collecting holder 12 is removed from the skin.
It is to be noted that the internal pressure of the blood collecting tube 10 is not necessarily be maintained in a reduced state.
In order to take the thus-collected blood out of the blood collecting tube 10 having the aforesaid construction for the purpose of testing, it is necessary to perform an operation t
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patent: 4420517 (1983-12-01), Ali
patent: 4559052 (1985-12-01), Babson
patent: 4808381 (1989-02-01), McGregor et al.
patent: 4813426 (1989-03-01), Haber et al.
patent: 4856533 (1989-08-01), Anraku et al.
patent: 4863453 (1989-09-01), Berger et al.
patent: 4920976 (1990-05-01), Calzi et al.
Hafer Robert A.
Owens Kerry
Terumo Kabushiki Kaisha
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