US 5,843,043 AGranted

Syringe and process for dispensing treatment fluid

OwnerGeorge Markusinventor

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Abstract

A syringe that includes a barrel with a removable, tapered nozzle having a rounded front end to facilitate its entering a body cavity without the necessity of puncturing the skin. The nozzle has side openings through which the treatment fluid can be expelled against the wall defining the body cavity. The syringe also has a plunger slidably movable in the barrel and provided with a front end shaped to substantially fill the nozzle so that, when the plunger is pushed fully forward, it will displace a selected amount of the treatment fluid safely through the side openings onto an adjacent wall surface of a body cavity. The nozzle is removably attached to the barrel so that it can be removed to place the selected amount of a treatment fluid in a chamber bounded by the barrel, the nozzle, and the front end of the plunger.

Claims19

Dependent claims

A syringe for dispensing a selected amount of a treatment fluid against a side wall surface of a body cavity to treat a pathological condition of the side wall surface, the syringe comprising:

(a) a generally cylindrical barrel having first and second ends spaced apart along the axis of the barrel, the first end having an internal surface of a certain internal cross-sectional configuration and size and an end surface of a certain configuration;
(b) a nozzle having:
(i) first and second ends spaced apart along a nozzle axis by a predetermined distance, the external surface of the first end being smoothly rounded and having a relatively small perimeter perpendicular to the nozzle axis to facilitate entry of the first end of the nozzle into the cavity, the second end being open and having a larger perimeter than the rounded first end,
(ii) a side wall having inner and outer surfaces, the inner surface enclosing, between the first and second ends of the nozzle, a cross-sectional area that increases with increasing distance from the first end of the nozzle toward the second end thereof, the nozzle also having, adjacent the open second end, an intersecting surface that has, at a predetermined distance along the nozzle axis from the rounded first end, a configuration that substantially matches the configuration of the end surface of the barrel, and
(iii) side aperture slots through the sidewall of the nozzle, each of the slots having side edges substantially parallel to the nozzle axis and one end closer to the first end of the nozzle;
(c) attachment means to attach the nozzle releasably to the barrel with the intersecting surface of the nozzle in substantially fluid-tight contact with the first end of the barrel;
and
(d) a plunger movable longitudinally along the barrel and having:
(i) a front portion facing the nozzle and shaped to fit the inner surface thereof, the front end of the plunger forming, with the inner surface of the nozzle and a portion of the barrel adjacent the first end thereof, a chamber into which the selected amount of the treatment fluid can be placed, and
(ii) actuator means to push the front portion of the plunger fully into the nozzle to fit against the inner surface thereof and thereby fill the chamber and displace substantially all of the treatment fluid through the side aperture slots.

7 more elements

A syringe for injecting a selected amount of a treatment fluid into a body cavity that includes a side wall surface to be treated by the fluid, the syringe comprising:

(a) a barrel having:
(i) first end and second ends spaced apart along an axis,
(ii) a first end surface of a certain configuration, and
(iii) an internal surface of a certain configuration and size along its length;
(b) a nozzle having:
(i) a smoothly rounded first end having a relatively small circumference to facilitate entry into the cavity,
(ii) an open second end of larger circumference than the rounded first end and spaced a predetermined axial distance from the rounded end,
(iii) an intersecting surface to abut the first end of the barrel, said intersecting surface having a configuration substantially matching the end surface of the barrel to fit fluid-tight against the end surface of the barrel,
(iv) a side wall having inner and outer surfaces, the inner surface enclosing, between the first and second ends of the nozzle, a cross-sectional area that increases with increasing distance from the first end of the nozzle toward the second end thereof, and
(v) side aperture slots through the sidewall of the nozzle, each of the slots having side edges substantially parallel to the axis of the nozzle;
and
(c) a plunger movable longitudinally along the barrel and defining, with the nozzle and a portion of the barrel adjacent the first end thereof, a chamber, whereby, when the plunger is drawn along the barrel in a direction away from the nozzle, the selected amount of the treatment fluid can be placed in the chamber, the plunger comprising:
(i) a front portion shaped to substantially conform to the inner surface of the nozzle, and
(ii) means to push the front portion fully into the nozzle and against the inner surface of the nozzle to fill the chamber and displace substantially all of the treatment fluid through the side aperture slots.

11 more elements

Dependencies are inferred from the claim text.