Retrobulbar needle and methods of use
First Claim
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1. A method of performing an injection into the orbital fat of a patient, the method comprising:
- providing a needle and a cannula, the cannula having a distal end, the needle having a sharpened distal end and a lumen extending proximally from said sharpened distal end, the needle positioned and longitudinally movable within the cannula between a distal position at which the needle sharpened distal end is distal of the cannula distal end, and a proximal position at which the needle sharpened distal end is proximal of the cannula distal end;
moving the needle into the distal position;
inserting the needle and the cannula into the orbital fat;
moving the needle into the proximal position; and
injecting a fluid through the distal end of the needle lumen, through the distal end of the cannula, and into the orbital fat;
wherein providing a needle and a cannula comprises providing a syringe includinga cylindrical barrel having a proximal end, a distal end, an interior wall, and an open interior space between the proximal and distal ends;
a plunger assembly includinga plunger stem having a proximal end and a distal end, anda piston attached to the plunger stem distal end, the piston forming a fluid seal with the barrel interior wall;
wherein the cannula is attached to the barrel, the cannula including a longitudinally extending lumen, a proximal portion, and a distal portion having a flexibility greater than the cannula proximal portion, the distal portion comprising the cannula distal end; and
a needle assembly including said needle, the needle includinga longitudinally extending shaft having a proximal end, said sharpened distal end, and said lumen extending proximally from the needle shaft sharpened distal end, anda proximal body mounted to the needle shaft proximal end, the proximal body sealing the proximal end of the needle shaft lumen, the proximal body positioned proximal of the piston.
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Abstract
A syringe and needle assembly includes a needle that extends through the barrel of the syringe and is attached to a proximal portion of the syringe. The distal end of the needle extends through a sleeve attached to the distal end of the syringe. The proximal end of the needle includes a spring which biases the needle proximally, so that the distal tip of the needle is normally retracted within the sleeve. The assembly can be used for injections in portions of a patient'"'"'s body including delicate tissues that could be damaged if contacted by the needle tip.
13 Citations
22 Claims
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1. A method of performing an injection into the orbital fat of a patient, the method comprising:
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providing a needle and a cannula, the cannula having a distal end, the needle having a sharpened distal end and a lumen extending proximally from said sharpened distal end, the needle positioned and longitudinally movable within the cannula between a distal position at which the needle sharpened distal end is distal of the cannula distal end, and a proximal position at which the needle sharpened distal end is proximal of the cannula distal end; moving the needle into the distal position; inserting the needle and the cannula into the orbital fat; moving the needle into the proximal position; and injecting a fluid through the distal end of the needle lumen, through the distal end of the cannula, and into the orbital fat; wherein providing a needle and a cannula comprises providing a syringe including a cylindrical barrel having a proximal end, a distal end, an interior wall, and an open interior space between the proximal and distal ends; a plunger assembly including a plunger stem having a proximal end and a distal end, and a piston attached to the plunger stem distal end, the piston forming a fluid seal with the barrel interior wall; wherein the cannula is attached to the barrel, the cannula including a longitudinally extending lumen, a proximal portion, and a distal portion having a flexibility greater than the cannula proximal portion, the distal portion comprising the cannula distal end; and a needle assembly including said needle, the needle including a longitudinally extending shaft having a proximal end, said sharpened distal end, and said lumen extending proximally from the needle shaft sharpened distal end, and a proximal body mounted to the needle shaft proximal end, the proximal body sealing the proximal end of the needle shaft lumen, the proximal body positioned proximal of the piston. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification