Medicinal dosing apparatus and method

Abstract

External manipulation of a prefilled vial to dispense its contents by deforming the vial is disclosed.

Description

FIELD OF THE INVENTION

The following invention relates generally to instrumentalities for administering doses of medicaments. More particularly, the instant invention is directed to a vial formed from elastically deformable material which is externally manipulated in order to squeeze the contents of the vial out of the vial and thus be dispensed.

BACKGROUND OF THE INVENTION

Syringes are well known medicinal dosing devices. In essence, they operate by having a substantially cylindrical bore within which a piston reciprocates. One end of the cylindrical bore admits and dispels fluid from the interior while another end of the cylinder allows a piston plunger to be received for axial translation in providing the propelling force for the introduction and utilization of the liquid. While these devices perform the avowed purpose of dispensing medicine, they have changed little since their inception. Typically, the piston includes a peripheral seal at an end thereof within the cylinder of the syringe and remote from the plunger. This seal is frequently lubricated with silicone to reduce the co-efficient of friction and may include latex, both ingredients of which have been the subject matter of ongoing scrutiny with respect to adverse patient reactions to these two products. In addition, in order for the syringe to receive the fluid, they either must be prefilled which provides an opportunity for contamination during the prefilling process, or they must be subsequently filled at the site of usage which requires that the syringe cooperate with an ampoule or a vial for fluid transferal.

In response to these problems, applicant has devised a series of prefilled syringes which are formed ascepticly and are filled concurrently in a blow-fill seal process. These prefilled, blow-filled seal syringes have dispensed for the need of receiving fluid from another source after the manufacture of the syringe, since the syringe is filled concurrently at its site of fabrication. While this product operates quite efficient and admirably, applicant has developed other devices in order to provide solutions to problems in related areas of this industry.

For example, applicant has devised an ampoule which is elastically deformable and prefilled using blow-fill seal technology which can dock with existing, conventional, known syringes in order to provide a more economical ampoule or vial where preference still exists for a conventional syringe.

The following prior art reflects the state of the art of which applicant is aware and is included herewith to discharge applicant's avowed duty to disclose relevant prior art. It is respectfully submitted, however, that none of the prior art when considered singly or in any conceivable, permissible combination teaches or renders obvious the instant invention set forth hereinafter.

	PATENT NO.	ISSUE DATE	INVENTOR
	829,178	August 21, 1906	Stegmaier
	1,643,531	September 27, 1927	Wolf
	1,762,430	June 10, 1930	Tokita
	2,486,321	October 25, 1949	O'Sullivan
	2,667,165	January 26, 1954	Smith
	2,667,872	February 2,1954	Smith
	2,744,527	May 8, 1956	Barrett, et al.
	2,744,528	May 8, 1956	Barrett, et al.
	2,748,770	June 5, 1956	Moeck
	2,768,623	October 30, 1956	Marchand
	2,881,953	April 14, 1959	Kuschel
	2,911,972	November 10, 1959	Elinger
	3,078,847	February 26, 1963	Wandell, et al.
	3,089,489	May 14, 1963	Dunmire
	3,187,966	June 8, 1965	Klygis
	3,261,381	July 19, 1966	Roach
	3,335,914	August 15, 1967	Strazdins, et al.
	3,340,869	September 12, 1967	Bane
	3,419,007	December 31, 1968	Love
	3,557,788	January 26, 1971	Swartz
	3,712,295	January 23, 1973	Kline
	3,736,933	June 5, 1973	Szabo
	3,938,514	February 17, 1976	Boucher
	3,977,553	August 31, 1976	Cornett, III, et al.
	4,018,222	Apri1 19, 1977	McAleer, et al.
	4,046,145	September 6, 1977	Choksi, et al.
	D 246,321	November 8, 1977	Löfman
	4,130,117	December 19, 1978	Van Eck
	4,168,032	September 18, 1979	Sneider
	4,213,456	July 22, 1980	Böttger
	4,248,227	February 3, 1981	Thomas
	4,282,986	August ll, 1981	af Ekenstam, et al.
	4,357,937	November 9, 1982	Burrell, Jr., et al.
	4,411,656	October 25, 1983	Cornett, III
	4,465,472	August 14, 1984	Urbaniak
	4,502,616	March 5, 1985	Meierhoefer
	4,506,793	March 26, 1985	MacGregor, et al.
	4,548,601	October 22, 1985	Lary
	4,610,670	September 9, 1986	Spencer
	4,643,309	February 17; 1987	Evers
	4,753,638	June 28, 1988	Peters
	4,883,473	November 28, 1989	Thomas
	4,944,736	July 31, 1990	Holtz
	4,955,871	September ll, 1990	Thomas
	4,966,312	October 30, 1990	Waring
	4,994,039	February 19, 1991	Mattson
	5,035,689	July 30, 1991	Schroeder
	5,102,398	April 7, 1992	Farris
	5,215,221	June l, 1993	Dirksing
	5,222,950	June 29, 1993	Eisenberg
	5,242,422	September 7, 1993	Schneberger, et al.
	5,334,l73	August 2, 1994	Armstrong, jr.
	5,356,406	October 18, 1994	Schraga
	5,370,626	December 6, 1994	Farris
	5,374,263	December 20, 1994	Weiler
	5,409,125	April 25, 1995	Kimber, et al.
	5,478,322	December 26, 1995	Farris, et al.
	5,5O9,9O6	April 23, 1996	Poynter
	5,538,506	July 23, 1996	Farris, et al.
	5,716,346	February l0, 1998	Farris
FOREIGN PRIOR ART
	FR 470700	April 7, 1914	Viviez
	DE 446819	July 7, 1927	Gaertner
	DE 556491	August 10, 1932	Meyer
	GB 0386298	February 9, 1933	Charlier
	DE 0577611	June 2, 1933	Schuckertwerke
	GB 557400	November 18, 1943	Wirth
	CH 0279468	March 1, 1952	Burmester
	CH 0092396	October 15, 1959	Merck & Co., Inc.
	FR 1316596	December 26, 1962	Bouet
	FR 1330410	May 13, 1963	Modiano
	AU 278032	December 2, 1965	Calmic Limited
	FR 2058585	May 3, 1971	Darbon
	WO 87/01944	April 9, 1987	Axipac Limited
	FR 2594687	August 28, 1987	Hosnedl
	EU 324257	July 19, 1989	Smith Industries
	EU 350772	January 17, 1990	Hansen
	DE 3827335	February 15, 1990	Pfeiffer E & Co.
	SU 1553135	March 30, 1990	Popov

SUMMARY OF THE INVENTION

The instant invention takes into account the fact that not all syringe related deployments require the elaborate methodologies and structure of the prior art in order to be effective. One common scenario involves catheter flushing which occurs predominately in a hospital environment and requires that a flush be applied in the catheter prior to and subsequent to the utilization of the catheter for the delivery of medicine. Flushes typically include heparin or saline in sufficient quantity to purge the catheter line free from the tendency of blood at the site from clotting.

Other examples where it is not essential to deliver extremely precise dosages include intermuscular and some vaccine injections and situations where exigent circumstances (i.e., time is of the essence) and the portability of the medicine far outweighs the risks associated with time delay (e.g., battle field environments).

The instant invention displays a variety of techniques which offer varying degrees of precision by taking an economical medicine storage device expeditiously and immediately deploying it without intervening manipulations.

At its broadest, the instant invention is directed to a device configured as a vial, preformed with the medication contained therewithin which can serve as the dosage administering device immediately. Initially, the liquid within the vial is sequestered from gas, commonly introduced during the manufacturing process. Once this sequestration has occurred, and perhaps sequestering some of the liquid with the gas, the vial can be oriented to push a quantity of the liquid immediately to its intended site. The outlet of the vial can have any of several contours, some of which are standardized by convention. For example, a luer coupling can be disposed at the outlet, a spike can be deployed at the outlet, or an outlet which is complemental to a luer can be found at the outlet end.

Various instrumentalities can be disposed on t,he exterior in order to act as an external plunger operating on exterior sidewalls of the vial to urge the liquid out from the vial while retaining the gas therewithin. All instrumentalities act on sidewalls of the vial.

OBJECTS OF THE INVENTION

Accordingly, it is a primary object of the present invention to provide a new and improved elastically deformable vial including means to provide external pressure thereto, collapsing the vial to remove the liquid therefrom, thus acting as an external syringe plunger.

A further object of the present invention is to provide a device as characterized above which is economical in construction, asceptic in fact and durable in use.

Viewed from a first vantage point, it is an object of the present invention to provide a dose administering device, comprising, in combination: a closed end wall, a flexible, collapsible sidewall circumscribing the end wall, an outlet coupling at an end of the sidewall opposite the closed end wall, fluid in said device, and plunger means disposed on an exterior of said device's flexible sidewall to eject fluid by constricting the sidewall.

Viewed from a second vantage point, it is an object of the present invention to provide a method for medicinal dosing, the steps including: sequestering gas from liquid in a vial, constricting the vial to sequester the gas in one area, opening the vial at a liquid containing other area and squeezing the liquid from the vial by deforming the vial.

Viewed from a third vantage point, it is an object of the present invention to provide an apparatus for dosing, comprising, in combination: a vial formed from elastically deformable material and having a sealed outlet, liquid contained within the vial, means exterior the vial for distorting an interior of the vial into two zones, one zone with liquid adjacent the outlet, another zone predominately with gas, the exterior means including means for squeezing the liquid from the vial upon unsealing the outlet.

These and other objects will be made manifest when considering the following detailed specification when taken in conjunction with the appended drawing figures.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of the apparatus according to one form of the present invention.

FIG. 2 shows the vial associated therewith.

FIG. 3 shows the vial of FIG. 2 deployed on the device of FIG. 1 .

FIG. 4 is a schematic depiction of the apparatus of FIG. 3 in use.

FIG. 5 shows a second stage of the apparatus of FIG. 3 in use.

FIG. 6 is a detail of one enabling component of that which is shown in FIG. 1 .

FIG. 7 is another enabling component of that which is shown in FIG. 1 .

FIG. 8 shows a first possible outlet on the vial.

FIG. 9 shows a second alternative outlet on the vial.

FIG. 10 shows a third alternative outlet on the vial.

FIG. 11 is an alternative embodiment to FIGS. 1 through 7 .

FIG. 12 is another embodiment compared to FIGS. 1 through 7 .

FIG. 13 shows FIG. 12 in a second deployed state.

FIG. 14 is another embodiment.

FIG. 15 shows FIG. 14 in a deployed configuration.

FIG. 16 shows FIGS. 14 and 15 in use.

FIG. 17 is a schematic depiction of another variation.

FIG. 18 shows FIG. 17 in the deployed configuration.

FIG. 19 shows FIGS. 17 and 18 in another stage.

FIG. 20 shows an adjustment capability of the instrument in FIGS. 17 through 19 .

FIG. 21 shows an initial manipulative step in using the vial.

FIG. 22 shows a stage in manipulating the vial.

FIG. 23 shows a further stage of FIG. 22 .

DESCRIPTION OF PREFERRED EMBODIMENTS

Considering the drawings, wherein like reference numerals denote like parts throughout the various drawing figures, reference numeral 10 is directed to the apparatus according to one form of the present invention.

In its essence, the apparatus includes a rectangular hand grip 2 which transversely supports a pair of rollers 6 , 12 at one end thereof. The rollers 6 , 12 can be oriented to gird a vial 50 , and remove the contents therefrom. Initially, the vial 50 is oriented as shown in FIG. 21 so that the gas appears at a tab end 52 of the vial and the liquid L is adjacent an outlet 54 . At this stage, note the outlet 54 remains closed with a removable opener 56 integrally formed thereto. Once the gas has been sequestered adjacent the tab 52 , the pair of rollers 6 and 12 constrict the vial 50 as shown in FIGS. 3 and 4 . This constriction is sufficiently effective to sequester substantially all of the liquid L to the left of FIG. 4 and all of the gas G to the right of the rollers.

FIGS. 6 and 7 show details of how the rollers cooperate against the vial to facilitate constriction. The left hand side of FIG. 1 is shown in FIG. 6 and includes upper and lower bearing collars 24 , 22 into which roller spindles 8 , 4 are placed. The roller spindles allow rotation of the rollers 12 , 6 thereon. The upper bearing collar 24 is hinged to the lower bearing collar 22 as shown in FIG. 1 by means of a pivot hinge 26 which extends between ears 27 reaching up from the lower bearing collar 22 . A lower portion of the upper bearing collar 24 is necked-down to nest in between the ears 27 . The converse could have also been used for support where the ears are on the upper bearing collar and the necked-down portion on the lower bearing collar. FIG. 6 shows a torsion spring 28 wrapped around the pivot hinge 26 to provide biasing and urge the rollers 6 , 12 to naturally go from the open position of FIG. 1 to the closed position of FIG. 4 . Thus, work has to be done along arrow “A” to separate the rollers.

FIG. 7 reflects details of the right hand side of the rollers of FIG. 1 , and shows a catch mechanism that tightly captures the upper roller to the lower roller. The catch is in the form of a slip hook 16 which when deployed as shown in FIG. 3 overlies the upper roller spindle 8 . When the vial 50 is so captured, minimal clearance exists between the opposite walls of the vial as shown in FIG. 4 . The rollers 6 , 12 themselves may be constructed from any suitable material and may have a durametric value which assures that the opposite walls of the vial are in relatively tight tangential registry. The force B exerted by the hook 16 assures a positive locking between the upper and lower rollers via their respective spindles and is enhanced by a torsion spring 18 wound about the lower spindle 4 and having a free end abutting against the handle 2 . An opposite free end includes a pip 20 that locates on a complementally formed indent on the hook 16 . The spring 18 ensures positive engagement and urges the hook 16 to the closed and latched position so that force is required opposite arrow “B” to unlatch the hook. FIG. 3 shows the position where the rollers are set on to the vial 50 and the vial opening 54 has been exposed by removing the closure 56 . The vial 50 can then be docked onto a fluid receiving device 100 shown to the left of FIG. 4 . This device can be a syringe needle if the vial 50 has a luer coupling as shown in FIG. 9 or may be a complementally formed luer receiver as shown in FIG. 10 which as a dimension X, complemental to the taper of the luer in FIG. 9 upstream from its opening to allow frictional engagement thereover. The outlet 54 may also be configured as shown in FIG. 8 which is termed a cannula spike.

Typically, when the vial 50 is used as a flushing device, the need for a precise amount of liquid dispensed by the vial 50 is not as critical as when one is dispensing certain pharmacological substances. Flushing frequently entails the washing of a catheter site with heparin or saline and is not critical with respect to the precise amount used at the catheter site.

Various other instrumentalities for causing the liquid to be urged from the vial 50 are shown in FIGS. 11 through 20 . In FIG. 11 , the rollers are replaced with upper and lower pressure administering devices 70 which do not rotate, but slide from right to left to remove the liquid. The pressure imposed and the coefficient of friction of such an anvil-type device 70 is designed to provide sure, positive motion. Each anvil has a curved smooth bottom surface to encourage point contact where they address one another. The curve also provides low stress on the vial. FIG. 12 shows a variation in which a triangular frame 80 supports tines or two lower rollers 82 and an upper tine or roller 84 constrained to operate within a trackway 86 which is vertically disposed when in the FIG. 13 orientation. Roller 84 , when moved from its highest elevation to its lowest elevation through the trackway 86 provides the constriction of the vial and allows the rollers to translate from right to left of that drawing figure.

FIGS. 14 through 16 show the roller arrangement of FIG. 1 , and adds a retaining mechanism 90 located above and below the tab 52 . The retaining mechanism 90 replaced the FIG. 4 finger pressure and acts as jaws which allow the tab to remain relatively stationary (compared to the rollers) and therefore the vial when the rollers 6 and 12 are first constricted against the vial and then relatively translated. The retaining mechanism 90 includes teeth 92 which are dimensioned to grip within a narrowed-down waist 53 where the tab 52 affixes to the main body of the vial 50 . FIGS. 15 and 16 show the retaining mechanism 90 engaged on the vial with the rollers 6 , 12 advancing towards the outlet 54 .

FIGS. 17 through 20 show an operation similar to FIGS. 14 through 16 in which the hand tool operates oppositely from that which is shown in FIGS. 14 through 16 . In other words, the retaining jaws 90 in FIGS. 14 and 16 are instead modified and located at the outlet end 54 of the vial. These modified retaining devices 190 are fixed to a first link 192 in a pliers-type of arrangement. It should be appreciated that any link mechanism associated with FIGS. 14 through 16 would operate similar to that which is shown in FIGS. 17 through 20 . In FIGS. 17 through 20 the rollers are attached to a second link 194 of the mechanism and a pivot 196 extends in between them. The pivot 196 is shown as being located on the first link 192 . The second link 194 includes a slot 198 having a plurality of stops 188 depicted as undulations for adjustment of the two links with respect to one another by orientation of the pivot 196 in any of the undulation stops 188 formed in the slot 198 . The upper extremities of each of the links may include hinges 201 , 203 respectively on the first link 192 and second link 194 . These hinges allow articulation as the links move from an open position to a closed position as shown in FIG. 19 . In addition, at least one link, preferably the second link 194 constrains its hinge 203 to operate in a trackway 205 to provide further freedom of motion and prevent tool binding.

FIGS. 21 through 23 schematically depict the process of removing liquid from the vial. First sequester the gas into the vial adjacent the tab 52 . Then crease the vial below the gas and next remove the cap 56 from the opening. Squeeze out the liquid.

Moreover, having thus described the invention, it should be apparent that numerous structural modifications and adaptations may be resorted to without departing from the scope and fair meaning of the instant invention as set forth hereinabove and as described hereinbelow by the claims.

Claims

1. A medicinal dose administering device, comprising, in combination:a closed end wall, a flexible, collapsible sidewall circumscribing said end wall, an outlet coupling at an end of said sidewall opposite said closed end wall, medicinal fluid in said device, and plunger means disposed on an exterior of said device's flexible sidewall to eject the medicinal fluid by constricting said sidewall, wherein said plunger means includes means to sequester substantially all liquid in the fluid adjacent said outlet coupling, wherein said plunger means includes a handle which supports said sequestering means thereon.

2. The device of claim 1 wherein said sequestering means includes a pair of arcuately shaped anvils under and overlying said flexible sidewalls, adapted with means to contact said sidewalls and cause tangential registry between opposing sidewalls thereof, to squeeze liquid from said outlet by translating parallel a long axis of said sidewall.

3. The device of claim 1 wherein said sequestering means includes an upper tine located above said sidewall and a pair of lower tines on an opposite side of said sidewall spaced from said upper tine so that, upon moving said upper tine and lower tines relatively closer to each other, said upper tine is straddled between said lower tines.

4. The device of claim 1 wherein said plunger means is embodied as a plurality of rollers straddling said device.

5. The device of claim 4 wherein two rollers are provided, said rollers oriented in planar registry and having a common end which permits arcuate movement of one roller with respect to another.

6. The device of claim 4 wherein said rollers are attached to a first link mechanism connected by a pivot to a second link, said second link constraining said device at said outlet.

7. The device of claim 5 including an end of said rollers remote from said common end provided with latching means.

8. The device of claim 7 including a tab projecting from said end wall of said device and retaining means located above and below said tab for grasping said tab to facilitate motion of said rollers with respect to said tab.

9. The device of claim 7 wherein said rollers are mounted on spindles, and said spindles are received in collars, said collars interconnected by a pivot defining said common end and including biasing means for urging said rollers into parallel registry.

10. The device of claim 9 wherein said remote end includes a resiliently biased catch which holds said rollers in parallel registry.

11. The device of claim 10 wherein said outlet coupling is formed as a luer coupling.

12. The device of claim 10 wherein said outlet coupling is formed as a spike.

13. The device of claim 10 wherein said outlet is configured as a conical taper narrowing from said sidewalls towards an axial centerline to frictionally overlie a luer coupling.

14. An apparatus for medicinal dosing, comprising, in combination:a vial formed from elastically deformable material and having a sealed outlet, medicinal liquid contained within said vial, means exterior said vial for distorting an interior of said vial into two zones, one zone with the medicinal liquid adjacent said outlet, another zone predominately with gas, said exterior means including means for squeezing the medicinal liquid from said vial upon unsealing said outlet.

15. A dose administering device, comprising, in combination:a closed end wall, a flexible, collapsible sidewall circumscribing said end wall, an outlet coupling at an end of said sidewall opposite said closed end wall, fluid in said device, and plunger means disposed on an exterior of said device's flexible sidewall to eject fluid by constricting said sidewall, wherein said plunger means includes means to sequester substantially all liquid in the fluid adjacent said outlet coupling, wherein said plunger means includes a handle which supports said sequestering means thereon, wherein said plunger means is embodied as a plurality of rollers straddling said device, wherein two rollers are provided, said rollers oriented in planar registry and having a common end which permits arcuate movement of one roller with respect to another, including an end of said rollers remote from said common end provided with latching means, wherein said rollers are mounted on spindles, and said spindles are received in collars, said collars interconnected by a pivot defining said common end and including biasing means for urging said rollers into parallel registry, wherein said remote end includes a resiliently biased catch which holds said rollers in parallel registry, wherein said outlet coupling is formed as a luer coupling.

16. A dose administering device, comprising, in combination:a closed end wall, a flexible, collapsible sidewall circumscribing said end wall, an outlet coupling at an end of said sidewall opposite said closed end wall, fluid in said device, and plunger means disposed on an exterior of said device's flexible sidewall to eject fluid by constricting said sidewall, wherein said plunger means includes means to sequester substantially all liquid in the fluid adjacent said outlet coupling, wherein said plunger means includes a handle which supports said sequestering means thereon, wherein said plunger means is embodied as a plurality of rollers straddling said device, wherein two rollers are provided, said rollers oriented in planar registry and having a common end which permits arcuate movement of one roller with respect to another, including an end of said rollers remote from said common end provided with latching means, wherein said rollers are mounted on spindles, and said spindles are received in collars, said collars interconnected by a pivot defining said common end and including biasing means for urging said rollers into parallel registry, wherein said remote end includes a resiliently biased catch which holds said rollers in parallel registry, wherein said outlet coupling is formed as a spike.

17. A dose administering device, comprising, in combination:a closed end wall, a flexible, collapsible sidewall circumscribing said end wall, an outlet coupling at an end of said sidewall opposite said closed end wall, fluid in said device, and plunger means disposed on an exterior of said device's flexible sidewall to eject fluid by constricting said sidewall, wherein said plunger means includes means to sequester substantially all liquid in the fluid adjacent said outlet coupling, wherein said plunger means includes a handle which supports said sequestering means thereon, wherein said plunger means is embodied as a plurality of rollers straddling said device, wherein two rollers are provided, said rollers oriented in planar registry and having a common end which permits arcuate movement of one roller with respect to another, including an end of said rollers remote from said common end provided with latching means, wherein said rollers are mounted on spindles, and said spindles are received in collars, said collars interconnected by a pivot defining said common end and including biasing means for urging said rollers into parallel registry, wherein said remote end includes a resiliently biased catch which holds said rollers in parallel registry, wherein said outlet is configured as a conical taper narrowing from said sidewalls towards an axial centerline to frictionally overlie a luer coupling.

18. A dose administering device, comprising, in combination:a closed end wall, a flexible, collapsible sidewall circumscribing said end wall, an outlet coupling at an end of said sidewall opposite said closed end wall, fluid in said device, and plunger means disposed on an exterior of said device's flexible sidewall to eject fluid by constricting said sidewall, wherein said plunger means includes means to sequester substantially all liquid in the fluid adjacent said outlet coupling, wherein said sequestering means includes a pair of arcuately shaped anvils under and overlying said flexible sidewalls, adapted with means to contact said sidewalls and cause tangential registry between opposing sidewalls thereof, to squeeze liquid from said outlet by translating parallel a long axis of said sidewall.

19. A dose administering device, comprising, in combination:a closed end wall, a flexible, collapsible sidewall circumscribing said end wall, an outlet coupling at an end of said sidewall opposite said closed end wall, fluid in said device, and plunger means disposed on an exterior of said device's flexible sidewall to eject fluid by constricting said sidewall, wherein said plunger means is embodied as a plurality of rollers straddling said device, wherein said rollers are attached to a first link mechanism connected by a pivot to a second link, said second link constraining said device at said outlet.

20. A dose administering device, comprising, in combination:a closed end wall, a flexible, collapsible sidewall circumscribing said end wall, an outlet coupling at an end of said sidewall opposite said closed end wall, fluid in said device, and plunger means disposed on an exterior of said device's flexible sidewall to eject fluid by constricting said sidewall, wherein said plunger means includes means to sequester substantially all liquid in the fluid adjacent said outlet coupling, wherein said plunger means includes a handle which supports said sequestering means thereon, wherein said plunger means is embodied as a plurality of rollers straddling said device, wherein two rollers are provided, said rollers oriented in planar registry and having a common end which permits arcuate movement of one roller with respect to another, including an end of said rollers remote from said common end provided with latching means, including a tab projecting from said end wall of said device and retaining means located above and below said tab for grasping said tab to facilitate motion of said rollers with respect to said tab.

21. The device of claim 20 wherein said tab includes a narrowed waist portion adjacent said end wall and said retaining means includes upper and lower teeth dimensioned to grip within said narrowed waist portion.

22. A dose administering device, comprising, in combination:a closed end wall, a flexible, collapsible sidewall circumscribing said end wall, an outlet coupling at an end of said sidewall opposite said closed end wall, fluid in said device, and plunger means disposed on an exterior of said device's flexible sidewall to eject fluid by constricting said sidewall, wherein said plunger means includes means to sequester substantially all liquid in the fluid adjacent said outlet coupling, wherein said sequestering means includes an upper tine located above said sidewall and a pair of lower tines on an opposite side of said sidewall spaced from said upper tine so that, upon moving said upper tine and lower tines relatively closer to each other, said upper tine is straddled between said lower tines.

23. The device of claim 22 wherein said tines are constrained to operate on a frame, and a vertical trackway located on said frame constrains said upper tine to move between said lower tines.

24. The device of claim 23 wherein said tines are contoured as rollers.

25. A dose administering device, comprising, in combination:a closed end wall, a flexible, collapsible sidewall circumscribing said end wall, an outlet coupling at an end of said sidewall opposite said closed end wall, fluid in said device, and plunger means disposed on an exterior of said device's flexible sidewall to eject fluid by constricting said sidewall, wherein said plunger means includes means to sequester substantially all liquid in the fluid adjacent said outlet coupling, wherein said plunger means includes a handle which supports said sequestering means thereon, wherein said plunger means is embodied as a plurality of rollers straddling said device, wherein said rollers are attached to a first link mechanism connected by a pivot to a second link, said second link constraining said device at said outlet.

26. The device of claim 25 wherein said links include independent adjustment means including a slot on one said link through which said pivot is allowed to move, said slot having a plurality of undulations to fix said pivot in one of several spots.

27. The device of claim 26 wherein free ends of each said link, adjacent said device are provided with pivots.

28. The device of claim 27 wherein one of said pivots on said link operates in a trackway.