Skin puncturing device
A safety needle assembly for skin puncturing. A plurality of needles driven by a reciprocating drive shaft extend and retract through an opening in one end of the assembly. Eleven or twelve needles are configured so as to minimize potential surface tension and reduce stress applied to the skin. The opening may be rounded or scalloped to reduce friction on the skin. An elastomeric or mechanical spring is used to assist in retracting the needles. Various alignment tabs and features are used to ensure proper alignment of the drive shaft within the assembly, and alignment of the needle assembly when attached to a handpiece during use. Safety tabs on the needle assembly prevent reuse. A protective sleeve may be used to cover the exterior of the needle assembly.
1. A device for skin puncturing, comprising:
a housing with a proximal end and a distal end and an interior and an exterior, said distal end comprising an opening;
a reciprocating drive shaft with a proximal end and a distal end disposed within said housing;
a needle head directly or indirectly attached to the distal end of the reciprocating drive shaft;
a plurality of needles extending from the needle head, each needle comprising a needle tip, wherein the needle tips periodically extend beyond the opening in the distal end of the housing with motion of the reciprocating drive shaft; and
one or more safety tabs adapted to open when the device is mounted on a handpiece, and adapted to permanently close when the device is removed from said handpiece, and thereby prevent the device from being remounted on said handpiece.
2. The device of claim 1 , wherein there are 11 or 12 needles extending from the needle head.
3. The device of claim 1 , wherein the needles are placed so that the maximum separation between adjacent needles is in the range of 0.075 inches to 0.125 inches.
4. The device of claim 1 , wherein the needles are placed so that each needle tip is equidistant from adjacent needle tips.
5. The device of claim 1 , further comprising a spring affixed to the reciprocating drive shaft.
6. The device of claim 5 , wherein the spring is in a state of tension when the reciprocating drive shaft has moved to a position such that said needle tips extend beyond the opening in the distal end of the housing, such that the tension helps retraction of the reciprocating drive shaft.
7. The device of claim 5 , wherein said spring is an elastomeric spring.
8. The device of claim 5 , wherein said spring is a mechanical spring.
9. The device of claim 1 , further comprising a drive shaft guide affixed to the interior of said housing, said drive shaft guide adapted to receive and guide the reciprocating drive shaft while in motion.
10. The device of claim 9 , said drive shaft guide further comprising at least one alignment key feature adapted to fit with a matching slot on the needle housing.
11. The device of claim 9 , said drive shaft guide further comprising a depth tab to indicate the distance the needle tips extend beyond the opening in the distal end of the housing with full extension of the reciprocating drive shaft.
12. The device of claim 1 , wherein the opening in the distal end of the housing comprises round or scalloped edges, or a combinations thereof.
13. The device of claim 1 , further comprising a protective sleeve adapted to cover some or all of the exterior of the housing, said protective sleeve comprising a proximal end with a large opening and a distal end with a small opening, said small opening adapted to fit securely around the distal end of the housing.
14. The device of claim 13 , wherein said protective sleeve is elastic and water-proof.
15. The device of claim 13 , wherein said protective sleeve is transparent in whole or in part.
16. A device for skin puncturing, comprising:
a housing with a proximal end and a distal end and an interior and an exterior, said distal end comprising an opening;
a reciprocating drive shaft with a proximal end and a distal end disposed within said housing;
a needle head directly or indirectly attached to the distal end of the reciprocating drive shaft;
a plurality of needles extending from the needle head, each needle comprising a needle tip, wherein the needle tips periodically extend beyond the opening in the distal end of the housing with motion of the reciprocating drive shaft; and
an elastomeric spring affixed to the reciprocating drive shaft;
further wherein the elastomeric spring provides a liquid-tight seal preventing liquids from traveling through the device.
17. The device of claim 16 , wherein the elastomeric spring is conical or cylindrical in shape.