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Publication numberUS3224445 A
Publication typeGrant
Publication dateDec 21, 1965
Filing dateMar 1, 1956
Priority dateMar 1, 1956
Also published asDE1086013B
Publication numberUS 3224445 A, US 3224445A, US-A-3224445, US3224445 A, US3224445A
InventorsNorman W Melott
Original AssigneeCook Waite Lab Inc
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Aspirating syringe
US 3224445 A
Abstract  available in
Previous page
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Claims  available in
Description  (OCR text may contain errors)

Dec. 21, 1965 N. w. MELOTT ASPIRATING SYRINGE Filed March 1, 1956 INVENTOR FIG. 3

ATTORNEY United States Patent m 3,224,445 ASPIRATING SYRINGE Norman W. Melott, Monndsville, W. Va., assignor to Cook-Waite Laboratories, Inc., New York, N.Y., a corporation of Delaware Filed Mar. 1, 1956, Ser. No. 568,873 3 Claims. (Cl. 128-218) This invention relates to a new and improved plunger rod for use in a syringe with a disposable cartridge having a piston cork, and the principal object of the present invention comprises the provision of a dental-type cartridge syringe having a movable plunger rod provided with a retractible barbed or spearpoint head at the inner end thereof for piercing the piston cork of the conventional disposable cartridge and thereby alfixing the plunger rod of the syringe to the cartridge piston cork, converting the conventional disposable cartridge into an aspirating cartridge.

In a conventional dental cartridge syringe, the plunger rod merely bears upon the piston cork of the cartridge and presses the cork inwardly to expel the cartridge contents through the syringe needle, but this does not provide for an aspirating action, which may be accomplished by a slight retraction of the cartridge piston cork in order to provide the operator with an indication as to whether or not the needle of the syringe has punctured a vein.

This invention provides simple, economical, and easily operated means for quickly affixing the plunger rod of the syringe to the piston cork of the cartridge, so that both aspiration and injection may be provided, merely by thrusting the novel barbed plunger rod inwardly, thereby piercing the piston cork with a sharp arrow or spearpoint, and hence assuring fixation of the plunger rod with respect to the cartridge piston cork; such fixation, however, being easily disrupted when the cartridge has been used and it is desired to throw it away merely by manually retracting the extending spearpoint within a sleeve provided for the purpose, and thus in effect pushing the cartridge piston cork from the spearpoint.

Other objects and advantages of the invention will appear hereinafter.

Reference is to be had to the accompanying drawings, in which FIG. 1 is a view in elevation of a syringe according to the present invention, parts being broken away and in section;

FIG. 2 is an enlarged section in the line 22 of FIG. 1;

FIG. 3 is an enlarged section on line 33 of FIG. 1;

FIGS. 4 and 5 are sections on the respective lines in FIG. 2; and

FIG. 6 is a view similar to FIG. 2 but illustrating the action of the spearpoint.

The invention may be used with any type of syringe presently used with disposable cartridges. The syringe illustrated is provided with a conventional barrel 10 having an observation window or windows 12 therein for viewing the cartridge for information as to content and aspiration. The barrel is provided with the usual needle 14 which extends rearwardly interiorly of the barrel to puncture the forward end 16 of the disposable ampoule or cartridge indicated at 18.

The syringe is provided with an axially movable plunger rod generally indicated at 20 which is used to engage the cartridge piston cork 22 to move the same along the cartridge for expelling the contents thereof through the needle 14.

The syringe also has a locking sleeve 24 which is threaded into the head 26, the latter being hinged as at 28 Patented Dec. 21, 1965 ice to the sides of the barrel. The head is provided with a fingerhold 30. When the locking sleeve is retracted, it becomes disengaged from the inner end of the barrel and thus the head 26 may be pivoted in order to expose the inner end of the barrel. However, when the locking sleeve is tightened with the head in place, the head becomes relatively immovable for use of the syringe in the normal manner.

The plunger rod for any syringe comprises a pair of relatively axially movable parts, one of which is shown as a rod indicated at 32 and the other part being a surrounding elongated sleeve 34 which is provided with an annular lateral flange 36 at the inner end thereof for forming a firm contact with the cartridge plunger 22, see particularly FIG. 2.

The inner end of the rod 32 of the present case is provided with a sharpened spearpoint indicated at 38. This spearpoint may be made integral with the rod 32, or it may be made separable and replaceable as for instance by means of screw-threads such as are shown at 40. The spearpoint is provided with barbs 42 and these may be sharpened at their rear surfaces 44 (see FIG. 6) for a purpose to be described.

The rod 32 has a limited axial motion relative to the surrounding sleeve 34 and limiting means may be provided as for instance by a through crosspin 46 in the rod 32 which engages a shoulder 48 to limit the extent of outward motion of the spearpoint relative to the inner end of the sleeve 34; and it may engage a necked-down or brazed collar 50 forming the limit stop for the other end of relative motion of rod 32 in the sleeve 34. In any event, the spearpoint 38 is provided with approximately the limit of motion between the solid and dotted line showings thereof in FIG. 6. This spearpoint may be completely housed within the sleeve or it may be extended outwardly thereof, so that the barbs 42 are in spaced relation with the inner end surface 52 of the flange or annular abutment 36.

The outer end of rod 32 is provided with an enlargement as at 54, this enlargement providing a guide and abutment for a coil spring 56 which normally serves to maintain the spearpoint in retracted housed position when not in use.

In the use of the device, the locking sleeve 24 is backed off, the head 26 pivoted to one side, the disposable cartridge is inserted in the barrel; the head is then re-positioned, the locking sleeve is tightened and the rod 20 is moved forwardly so as to engage the flange 36 thereof with the exterior surface of the cartridge piston cork 22. Continued thrust on the plunger rod 20 results in the piercing of "the cork 22 by the spearpoint 30 until it becomes completely embedded therein as in FIG. 2. After the plunger is fixed, the needle is attached to the syringe.

The plunger rod of the syringe and the cork of the cartridge are now fixed together and the syringe may be operated both for aspirating and injecting as will be clear to those skilled in the art.

When the cartridge is to be disposed of, the rod 32 is retracted by fingerpiece 58, and this action brings the spearpoint back in sleeve-housed position as shown in solid lines in FIG. 6, thus disrupting the sprearpoint from the cork 22, allowing the entire cartridge to be disposed of, and a new cartridge replaced in the barrel. The spearpoint is more easily withdrawn from the cork due to the sharp edges 44 on the barbs.

It will be seen as in FIG. 2 that when the spearpoint is in its forwardmost position, the flange 36 engages the exposed surface of the piston cork 22. The spring 56, tending to retract the spearpoint maintains this relationship, so that upon aspiration and injection, =but particularly upon the latter operation, the sleeve 34 and rod 32 act as a unit and the sprearpoint alone is not depended upon to provide the motion of the cartridge piston cork 22.

Having thus described my invention and the advantages thereof, I do not wish to 'be limited to the details herein disclosed, otherwise than as set forth in the claims, but what I claim is:

1. An aspirating syringe comprising a generally cylindrical magazine, a plunger reciprocable longitudinally within said magazine, and a substantially flat a'spirator hook rigidly fixed to the forward end of said plunger; said magazine being adapted to receive therein a cylindrical ampoule having a piston stopper slidable forwardly therein to expel a medicament therefrom and retractible to afford aspiration, said hook having substantially similar opposite side faces approximately parallel to the line of reciprocal movement of the plunger; said hook being adapted to become embedded in said stopper without turning relatively thereto, and having a portion opposing its withdrawal from said stopper upon a retraction stroke of the plunger.

2. An aspirating syringe according to claim 1, said hook having a neck portion, and said withdrawal-opposing porportion of the hook being a barb extending laterally from said neck portion.

3. An aspirating syringe according to claim 2, said barb having a rearwardly pointing end.

4 References Cited by the Examiner UNITED STATES PATENTS RICHARD A. GAUDET, Primary Examiner.



RENE D. TEGTMEYER, Assistant Examiners.

Patent Citations
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US2524367 *Mar 8, 1948Oct 3, 1950Arthur E SmithHypodermic ampoule syringe
US2555878 *Jun 6, 1949Jun 5, 1951Drabicki AnthonyHypodermic syringe
US2568173 *Jun 12, 1948Sep 18, 1951Theodore D SpivackAspirating hypodermic syringe
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US2789559 *Aug 30, 1955Apr 23, 1957Hoechst AgSyringe with aspiration device for cylindrical ampoules
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FR1005300A * Title not available
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3460534 *Nov 25, 1966Aug 12, 1969Robert B BlackAspirating cartridge syringe with gas actuation
US3797487 *Oct 27, 1971Mar 19, 1974Woelm Fa MHypodermic syringe with clutch for aspiration
US3838690 *Aug 16, 1973Oct 1, 1974B FriedmanReplaceable cartridge hypodermic syringe having sterile maintenance of needle
US4216771 *Dec 5, 1977Aug 12, 1980Sven ArlersHypodermic syringe with aspiration effect
US4333456 *Feb 9, 1981Jun 8, 1982Sterling Drug Inc.Self-aspirating hypodermic syringe and self-aspirating assembly therefor
US4333457 *Feb 9, 1981Jun 8, 1982Sterling Drug Inc.Self-aspirating syringe with frictionally engaged locking collet
US4381779 *Jul 16, 1981May 3, 1983Sterling Drug Inc.Deformable slidable piston to provide self-aspiration in hypodermic cartridge ampoules
US4407283 *Oct 19, 1981Oct 4, 1983Dale C. GrierSelf-injecting syringe
US4525167 *Aug 4, 1983Jun 25, 1985Goldberg Edward MBody fluid suction device
US4931043 *Aug 8, 1988Jun 5, 1990Sterling Drug Inc.Ratchet connector for hypodermic syringe pistons
US5094148 *May 8, 1989Mar 10, 1992Habley Medical Technology CorporationPiston stem insert for a carpule based piston
US5730729 *Jun 5, 1995Mar 24, 1998Sanofi Winthrop Inc.Self-tapping plunger rod for cartridge needle unit
US8100865 *Jun 14, 2001Jan 24, 2012Hambley LimitedHypodermic syringe with passive aspiration feature
US8986259 *Jun 1, 2010Mar 24, 2015Sanofi-Aventis Deutschland GmbhPiston rod assembly for a drug delivery device
US20030187406 *Jun 14, 2001Oct 2, 2003Spofforth Leonard MorrisHypodermic syringe with passive aspiration feature
US20110245780 *Jun 1, 2010Oct 6, 2011Michael HelmerPiston rod assembly for a drug delivery device
DE2915339A1 *Apr 14, 1979Nov 6, 1980Pajunk Gmbh Feingeraetebau MedHandle locking device for syringe holder - has members engaging annular groove in holder, released by sliding sleeve
EP0016633A2 *Mar 19, 1980Oct 1, 1980Ortho Diagnostic Systems Inc.Blood gas controls composition, method and apparatus
U.S. Classification604/228, D24/114, 102/512
International ClassificationA61M5/24
Cooperative ClassificationA61M5/24, A61M2005/2407, A61M2005/2437, A61M2005/2496
European ClassificationA61M5/24