US 2006/0223026 A1 · Liquid injection needle element capable of jetting a liquid in a predetermined angle range and method of producing the same

Abstract

A cannula has a front part in a direction of a center axis X with its forward end portion closed. The front part has a plurality of nozzle orifices each of which has an orifice axis Y intersecting the center axis X. Each of the nozzle orifices has a first diameter in a first direction parallel to the center axis X and a second diameter in a second direction perpendicular to the first direction. The first diameter ranges between 0.1 mm and 0.5 mm while the second diameter ranges between 0.1 mm and 0.3 mm so that a liquid in the cannula is jetted from the nozzle orifices in an angle range of 45 degrees towards the forward end portion with respect to the orifice axis.

Claims16

Dependent claims

A liquid injection needle element comprising a cannula having a front part in a direction of a center axis with its forward end portion closed, the cannula having a plurality of nozzle orifices formed on the front part and spaced from one another so as to allow a liquid in the cannula to be jetted out of the cannula when the liquid is applied with pressure, wherein:

each of the nozzle orifices has an orifice axis intersecting the center axis;
each of the nozzle orifices having a first diameter in a first direction and a second diameter in a second direction intersecting the first direction, the first diameter ranging between 0.1 mm and 0.5 mm, the second diameter ranging between 0.1 mm and 0.3 mm;
the liquid being applied with pressure ranging between 19.613×103 Pa and 196.133×103 Pa to jet the liquid from the nozzle orifices in an angle range of 45 degrees towards the forward end portion with respect to the orifice axis.

A method of producing a liquid injection needle element comprising a cannula having a front part in a direction of a center axis with its forward end portion closed, the cannula having a plurality of nozzle orifices formed on the front part and spaced from one another so as to allow a liquid in the cannula to be jetted out of the cannula when the liquid is applied with pressure, the method comprising the steps of:

preparing a tubular workpiece, facing a discharge wire to an outer surface of the workpiece in a direction intersecting the center axis of the workpiece, and moving the discharge wire to form the nozzle orifice by wire electric discharge;
moving the discharge wire in the direction of the center axis to successively form the nozzle orifices at a front part of the workpiece with a space kept from one another in the direction of the center axis;
and
sealing and closing a forward end portion of the workpiece in the direction of the center axis.

1 more element

Dependencies are inferred from the claim text.

Liquid injection needle element capable of jetting a liquid in a predetermined angle range and method of producing the same

Life of this patent

Liquid injection needle element capable of jetting a liquid in a predetermined angle range and method of producing the same

Life of this patent

Abstract

Claims16