Pre-loaded needle assembly
DCFirst Claim
1. For implanting therapeutic elements, a needle assembly comprising a cannula having a wall and a sharpened distal end, a line of elements in the cannula extending rearward from the distal end, yieldable means, including a plug, for positioning an element more proximate the distal end a predetermined distance from the distal end, and a stylet reciprocable in the cannula and having a distal end engaging an end of the line of elements more remote from the distal end of the cannula.
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Abstract
For implanting a therapeutic element, this needle assembly includes a cannula having a sharpened distal end, a line of elements in the cannula extending rearward from the distal end. A yieldable positioner including an absorbable plug positions the element more proximate the distal end a predetermined distance from the distal end. The positioner may be in various forms including an end plug, a tab in the cannula. The needle assembly may also be pre-loaded with the line of elements and be sterile and a distortion of the wall of the cannula. A stylet is reciprocable in the cannula and engages the end of the line of elements more remote from the distal end of the cannula.
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Citations
21 Claims
- 1. For implanting therapeutic elements, a needle assembly comprising a cannula having a wall and a sharpened distal end, a line of elements in the cannula extending rearward from the distal end, yieldable means, including a plug, for positioning an element more proximate the distal end a predetermined distance from the distal end, and a stylet reciprocable in the cannula and having a distal end engaging an end of the line of elements more remote from the distal end of the cannula.
- 9. For implanting a therapeutic element, a needle assembly comprising a cannula having a wall and having a sharpened distal end, a generally cylindrical end plug frictionally held in the distal end having a rearward end extending from the distal end a pre-determined distance, a line of elements in the cannula contacting the plug and extending rearward thereform, and a stylet reciprocable in the cannula and having a distal end engaging an end of the line of elements more remote from the distal end of the cannula.
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17. A method of making a needle assembly for implanting radiation seeds, comprising the steps of:
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a. providing a cannula having a sharpened distal end and a generally cylindrical plug, b. forcing the plug into the sharpened distal end of the cannula to frictionally reside there.
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18. A method of making a needle assembly for implanting therapeutic elements, comprising the steps of:
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a. providing a cannula having a wall and having a sharpened distal end and providing a generally cylindrical plug, b. placing the plug into the sharpened distal end of the cannula to reside there, and c. modifying the diameter of the plug to enhance its frictional engagement with the wall of the cannula. - View Dependent Claims (19, 20, 21)
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Specification