Syringe

Details Syringe Syringe

1997-06-03

1999-04-06

Yasko, John D.

Surgery

Means for introducing or removing material from body for...

Treating material introduced into or removed from body...

604232, A61M 500

Patent

active

058911065

DESCRIPTION:

BRIEF SUMMARY
This application is a 371 of PCT/RU95/00261 filed Dec. 4, 1995
1. Technical Field
This invention relates to a medical instruments and specifically to devices and apparatuses for introducing of medical preparations in a process of therapeutical and/or surgical treatment. More specifically the invention relates to a structure of a syringe and can be used, in particular, at dental treatment while providing for intraligamental, intrabonal, intraseptal or endopulpier analgesia, as well as for sealing of root channels of teeth.
Particularly, the invention relates to particulars of syringe details such as a drive unit ensuring strictly dosed and limited movement of a plunger by its blocking; a fastening unit for double-edged needle ensuring mobility of injection part of the needle; as well as to their mutual arrangement and other elements, ensuring simplicity, reliability and universality of the syringe.
2. Background Art
One has to deal in dental treatment with a patient who often suffers a notable pain from the beginning. Therefore there is the need to provide the effective local analgesia at the very beginning of a medical (therapeutical or surgical) interference.
Generally a structure of a syringe used in dental treatment contains a joint casing (a body and a barrel), in which a cartridge with appropriate analgesic means is placed, usually having an elastic face wall on the part of a needle and on the other part--a movable plug interacting with a plunger located coaxial in the back part of the casing. A mechanical drive provides for longitudinal translational motion of the plunger. Such structure is described, for example, in French application FR 2343486, published in 1977. IPC A 61 M May 20.
Exact dosage of an analgesic substance is extremely important when highly efficient medical means are used for to exclude pain feelings of the patient on the one hand, and to prevent excessive introduction (overdosing) of the analgesic on the other. Exact dosing is especially desirable at intraligamental, intrabonal, intraseptal or endopulpier analgesia. In the state of the art such dosing is provided by providing for the structure of a syringe, having a joint casing in which above mentioned cartridge interacting with the plunger is placed, of a ratchet-and pawl mechanism for fixed movement of the plunger. The ratchet-and pawl mechanism includes the plunger provided by ratchet teeth, and a syringe drive system actuated by a handle hinged to the casing, which can be squeezed with the casing by a hand of the dentist carrying out an analgesia.
The closest analogue to the claimed device is a dental syringe, which consists of a body, connected by a bayonet joint with a barrel, a piston with a plunger having ratchet teeth, and a drive system, including a rotary handle fixed on the body, a driver pawl interacting with the handle by means of a rotary lever with a roller, and a sleeve with a bushing having ledges and loaded by a spring.
A lock for preventing the return move of the plunger, which is made in a form of a cylinder with ledges interacting with the ratchet teeth, is rigidly fixed in the sleeve by means of a pin. The lock permits the plunger to be moved in the direction to the barrel only. A cartridge is placed into the barrel, which has an elastic end wall on the one hand, and movable plus interacting with a piston - on the other. There is a needle inside the barrel, piercing the end wall of the cartridge. For fastening of the infection needle the barrel is provided by a bevel (USSR inventor's certificate SU 1591989. IPC A 61 M May 24, 1988).
This structure permits to inject the analgesic liquid by exact dozes, corresponding to movement of the cartridge piston to a distance equal to the step of the ratchet tooth on the plunger. However in some cases there is the need to inject significant quantity of the analgesic liquid in a mode of conducting or infiltration analgesia. Such necessity can be found out after the analgesic treatment already began, that in the known state of the art would require extraction of the needl

REFERENCES:
patent: 4710172 (1987-12-01), Jacklich et al.
patent: 4710178 (1987-12-01), Leonard et al.
patent: 4936833 (1990-06-01), Sams
patent: 5433352 (1995-07-01), Ronvig

Affiliated with

Also associated with

Rating

Syringe does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Syringe, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Syringe will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1366726