Liquid injection needle element capable of jetting a liquid in a predetermined angle range and method of producing the same
First Claim
1. 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.
2 Assignments
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Accused Products
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.
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Citations
16 Claims
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1. 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:
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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. - View Dependent Claims (2, 3, 4)
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5. 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:
the nozzle orifices are spaced from one another in the direction of the center axis, the cannula having a base extending along the center axis and a curved portion extending from one end of the base towards the front part of the cannula and bent around the center axis. - View Dependent Claims (6, 7, 8, 9)
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10. 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:
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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. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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Specification