Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1982-01-28
1983-10-04
Yasko, John D.
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
A61M 520
Patent
active
044076592
DESCRIPTION:
BRIEF SUMMARY
This invention relates to controllable drive systems and is particularly concerned with such a drive system as applied to syringes as used to deposit samples for chemical analysis. One example application of the invention is in the field of spectroscopic analysis.
Syringe drive systems as used prior to the present invention have involved a motor connected to the syringe through the intermediary of a transmission mechanism such as a rack and pinion mechanism or a cam mechanism. Drive systems of that kind however, cannot provide a consistently accurate response because of backlash and other inherant characteristics, and consequently are not suited for some applications. For example, they are not satisfactory if a sample is to be deposited in sub-microliter volume with repeatable performance.
It is a principal object of the present invention to provide a syringe drive system which is relatively simple and is consistently accurate by comparison with prior systems.
A basic characteristic of the drive system of the present invention is that a motor is connected to the syringe through a single coupling as distinct from the relatively complicated mechanism of prior systems. Furthermore, the motor applies a drive force in the axial direction of the syringe and along a line substantially coincident with the syringe axis. The coupling merely serves as a means of ensuring syringe response to that force in either of two directions in which it may act.
In accordance with the present invention, there is provided a syringe drive system including, support means for receiving and holding the body of a syringe against axial movement, a drive motor connected to said support so as not to be movable relative thereto, a drive shaft connected to said motor and being movable axially in response to energization of said motor, the axis of said drive shaft being substantially parallel to the axis of said syringe body when held by said support means and coupling means connected to said drive shaft for movement therewith in said axial direction and being connectable to the plunger of said syringe so that said plunger moves axially of said syringe body in response to said axial movement of the drive shaft.
The essential features of the invention, and further optional features, are described in detail in the following passages of the specification which refer to the accompanying drawings. The drawings however are merely illustrative of how the invention might be put into effect, so that the specific form and arrangement of the features (whether they be essential or optional features) shown is not to be understood as limiting on the invention.
In the drawings:
FIG. 1 is a plan view (with parts removed) of one embodiment of the invention;
FIG. 2 is a cross sectional view taken along line II--II of FIG. 1;
FIG. 3 is a cross sectional view taken along line III--III of FIG. 1;
FIG. 4 is a cross sectional view taken along line IV--IV of FIG. 1.
In a preferred embodiment of the invention as shown in the drawings, the drive motor 1 is a stepper or incremental advance motor having a drive shaft 2 which moves axially in response to energization of the motor 1. In the form shown, the motor 1 is electrically energized and has an internally threaded rotor (not shown) co-operating with an external thread of the drive shaft 2. Incremental advance or retraction of the shaft 2 is achieved by pulsed energization of the motor 1 and the rate and duration of such pulses may be varied according to circumstances. Accurate control of shaft movement can be achieved however, through appropriate electronics and the shaft 2 will remain fixed in position immediately upon termination of an energizing pulse.
A drive motor 1 as described is secured to a suitable support structure 10 for a syringe 3 so that the axis of the drive shaft 2 is substantially co-axial with the axis of the syringe body 4. In the arrangement shown, the support structure 10 includes two cradle supports 5 and 6 which engage respective opposite end portions of the syringe body 4 and any suitable c
REFERENCES:
patent: 2627270 (1953-02-01), Glass
patent: 3313291 (1967-04-01), Marshall
patent: 3701345 (1972-10-01), Heilman et al.
patent: 3701350 (1972-10-01), Guenther
patent: 4191187 (1980-03-01), Wright
patent: 4255096 (1981-03-01), Coker, Jr. et al.
Berkowitz Edward H.
Cole Stanley Z.
Fisher Gerald M.
Varian Associates Inc.
Yasko John D.
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