| 摘要 |
The present invention embraces an improved pipetting probe wherein a portion of the interior of said probe is etched so as to create fluid turbulence therewithin during use to improve the washing out of residual sample fluid. More particularly, the pipetting probe of the present invention comprises a rigid tubular sheath (11) tightly circumscribing a tubular polymeric liner (12) wherein a portion of the interior of said polymeric liner is etched, particularly that portion excluding the sample region portion. The present invention also embraces a method of improving the internal washing efficiency of a pipetting probe by etching a portion of the interior of the pipetting probe. In addition, the invention embraces a method of making an improved pipetting probe by pulling a tubular polymeric liner, which has a narrowed liner portion formed by a narrowing die, into a rigid tubular sheath, and allowing the narrowed liner portion to expand against screw threads in the tip portion of the sheath so as to become immovably fixed therein. |
