Implant needle and method
First Claim
1. A subcutaneous implant needle for flexible implant pellets comprising a hollow metal tube having an outer diameter of a significant fraction of an inch and of sufficient rigidity to resist bending when subjected to manual force,one end of the tube being cut on a plane at an angle less than 30°
- with respect to the central axis of the tube to define an end face surrounding an elliptical opening and having an elliptical outer edge, said end being provided with a pair of dimples, one located a fraction of an inch forward of the rear edge of the opening and the other located a fraction of an inch behind the opening.
1 Assignment
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Accused Products
Abstract
An improved subcutaneous implant needle is formed as a hollow tube having its forward end cut on a plane at an acute angle to the central axis of the tube to form an elliptical opening, and an elliptical outer edge having a sharp forward portion. The forward extremity of the needle is dressed to form cutting edges intersecting at an obtuse angle and forming a central point. The dressed edges have a width preferably less than two-thirds the diameter of the tube, and the adjoining side portions of the elliptical outer edge are rendered unsharp and dulled, as by abrasion such as sandblasting or tumbling in abrasive media. The needle is dimpled at two locations closely adjacent the rear of the opening.
255 Citations
14 Claims
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1. A subcutaneous implant needle for flexible implant pellets comprising a hollow metal tube having an outer diameter of a significant fraction of an inch and of sufficient rigidity to resist bending when subjected to manual force,
one end of the tube being cut on a plane at an angle less than 30° - with respect to the central axis of the tube to define an end face surrounding an elliptical opening and having an elliptical outer edge, said end being provided with a pair of dimples, one located a fraction of an inch forward of the rear edge of the opening and the other located a fraction of an inch behind the opening.
- View Dependent Claims (5, 6, 7)
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2. A subcutaneous implant needle comprising a hollow tube formed from stainless steel having an outside diameter of approximately 1/4 inch (6.35 mm) and an inside diameter of approximately 7/32 inch (5.556 mm) and of sufficient rigidity to resist bending when subjected to manual force, one end of the tube being cut on a plane at an angle of from about 15°
- to about 20°
with respect to the central axis of the tube to define an end face surrounding an elliptical opening and having an elliptical outer edge, the forward extremity of the cut portion being dressed to provide two substantially straight sharpened edge portions having a total width less than the outside diameter of the tube and forming an included angle of the order of 135°
, the one end being provided with a pair of dimples, one dimple being located in the wall opposite the opening about 3/16 inch (4.76 mm) forward of the rear edge of the opening and another dimple being located about 3/16 inch (4.76 mm) rearward of the rear edge of the opening. - View Dependent Claims (3, 4)
- to about 20°
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8. A subcutaneous implant needle comprising a hollow metal tube having an outer diameter of a significant fraction of an inch and of sufficient rigidity to resist bending when subjected to manual force, one end of the tube being cut on a plane at an angle less than 30°
- with respect to the central axis of the tube to define an end face surrounding an elliptical opening and having an elliptical outer edge, the forward extremity of the cut end being sharpened over a width less than the diameter of the tube and the adjacent diverging side portions of the elliptical outer edge being treated to dull the sharpness thereof, said end also being provided with a pair of dimples, one located a fraction of an inch forward of the rear edge of the opening and the other located a fraction of an inch behind the opening.
- View Dependent Claims (9, 10)
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11. The method of manufacturing a subcutaneous implant needle comprising
providing a hollow tube of rigid material having a forward end, cutting the forward end of the hollow tube along a plane at an acute angle to its central axis to provide an elongated and closed outer edge, dimpling the hollow tube in two locations closely adjacent the rear edge of the opening, and abrading the cut end of the needle to blunt the sides of its elongated and closed outer edge.
- 13. The method of manufacturing a subcutaneous implant needle comprising the steps of providing a hollow tube of rigid material having a forward end, cutting the forward end of the hollow tube along a plane at an acute angle to its central axis to provide an elongated and closed outer edge, dimpling the hollow tube in two locations closely adjacent the rear edge of the opening, abrading the cut edge of the needle to blunt the sides of its elongated and closed outer edge, dressing the foremost extremity of the cut end of the tube to form a sharp cutting edge thereon of a width less than the diameter of the tube and performing the abrading step so as to avoid dulling such sharp cutting edge.
Specification