Measuring and testing – Sampler – sample handling – etc. – Withdrawing through conduit or receptacle wall
Reexamination Certificate
2000-11-06
2001-08-07
Larkin, Daniel S. (Department: 2856)
Measuring and testing
Sampler, sample handling, etc.
Withdrawing through conduit or receptacle wall
C073S864740, C600S573000, C604S032000, C604S248000
Reexamination Certificate
active
06269704
ABSTRACT:
FIELD OF THE INVENTION
The present invention is in the field of liquid sampling devices and in particular it is concerned with a blood sampling device for mounting on a tubing of an infusion set.
BACKGROUND OF THE INVENTION
In many medical procedures, an individual is connected to an infusion set for administration of medicaments and liquids. However, periodically it is required to obtain a blood sample from the individual for carrying out laboratory tests.
It is thus required that such blood samples contain only so-called fresh blood drawn from the patient, i.e. Without residual medicaments or liquids from the infusion set on the one hand and, on the other hand, be freshly drawn from the individual.
For this purpose, there are a variety of blood sampling devices which are typically used with a suitable blood drawing port or valve as known per se.
A blood sampling device must be capable of first obstructing flow through the infusion set and then drawing a sufficient amount of liquid residual in a portion of the tubing of the infusion set extending between the sampling device and the individual, where the sufficient amount is defined as being at least slightly more than the volume confined within said tubing portion.
Various blood sampling devices are disclosed, for example, in U.S. Pat. Nos. 4,673,386, 5,324,266, 4,105,500, 4,703,763, 4,838,855 and 5,002,066.
It is an object of the present invention to provide a novel and improved sampling device suitable for use in particular in conjunction with an infusion set.
SUMMARY OF THE INVENTION
In accordance with the present invention there is provided a blood sampling device typically to be mounted on an infusion set at a location essentially proximal to an end of the infusion set connected to the patient.
In accordance with a present invention there is provided a liquid sampling device comprising:
a housing defining a confined volume and fitted with an inlet port and an outlet port;
a drawing member formed with a conduit and being displaceable between a flow position in which said conduit communicates between the inlet port and the outlet port, and a drawing position in which communication between the inlet port and the outlet port is interfered and wherein upon displacing the drawing member into the drawing position liquid is drawn into the confined volume via said outlet port.
According to a preferred embodiment, the sampling device is further provided with a sealing member displaceable between a first position corresponding with the flow and drawing positions of the drawing member, and a second position in which the confined volume is sealingly disconnected from the outlet port. When the device comprises a sealing member, it is ensured that during sampling of a liquid from a line connected to the outer port, liquid drawn into the confined volume will not be sampled.
In accordance with an embodiment of the invention, there is provided a sampling port fitted on a tube portion connected to the outlet port, which in said tube portion may be integral or not with the sampling device. The sampling port may be any of a variety of sampling valves as known in the art.
In accordance with a preferred embodiment of the present invention, the housing comprises a cylindrical space; the drawing member and the sealing member each have a sector-like shape snugly received within the housing, the volume of both said drawing member and said sealing member together is less than the volume of the cylindrical space.
By a specific design of the preferred embodiment, the drawing member and the sealing member are rotatably displaceable within the housing about a common axis coaxial with an axis of the cylindrical space of the housing.
Preferably, there is provided a displacing element extending from the housing and useful for displacing the drawing member between its flow position and drawing position. The displacing element is articulated or integrally formed with the drawing member.
In order to retain either or both of the sealing member and the drawing member in either of their respective positions, there may be provided a retaining arrangement. By one application, the retaining arrangement is a snapping-type engagement formed between a wall of the housing and a respective wall portion of either or both of the sealing member and the drawing member.
Preferably, the confined volume comprises an airing port for venting the confined volume during displacement of the drawing member between its respective positions.
By one specific design, the inlet port and the outlet port are co-axially aligned. By other designs, an axis of the conduit within the drawing member extends at a plane essentially perpendicular to a plane of displacement of the drawing member.
In accordance with the preferred embodiment of the present invention, the sealing member is displaced between its first and second positions by displacing the drawing member which in turn is displaced by the displacing element.
The arrangement in accordance with the preferred embodiment of the present invention is such that at the flow position of the drawing member a first side wall thereof is flush with a first side wall of the sealing member; and at the first and second positions of the sealing member a second side wall thereof is flush with a second side wall of the drawing member.
Typically, the displacing element is snappingly articulated to the housing in a manner ensuring smooth rotation thereof.
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Gil Tomer
Ziv David
Elcam Plastic Cooperative Agricultural Association Ltd.
Garber Charles D.
Larkin Daniel S.
Nath Gary M.
Nath & Associates PLLC
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