Patent ID: 8562920

Claim:
A micro plate treating device, comprising a micro plate having wells arranged in a first matrix form, the first matrix form comprising a first plurality of rows and a first plurality of columns, at least one pair of adjacent rows in the first plurality of rows defining a first row interval therebetween, at least one pair of adjacent columns in the first plurality of columns defining a first column interval therebetween, one or two or more nozzle heads each having nozzles arranged in a second matrix form, the second matrix form comprising a second plurality of rows and a second plurality of columns, at least one pair of adjacent rows in the second plurality of rows defining a second row interval therebetween, at least one pair of adjacent columns in the second plurality of columns defining a second column interval therebetween, and moving means capable of effecting relative movement between the micro plate and the nozzle heads, wherein tips of all the nozzles arranged in each of the nozzle heads are configured to be permitted to be simultaneously inserted into some of the wells in the micro plate, at least one of the second row interval and the second column interval is set to a natural number multiple of the first row interval or the first column interval, the natural number being two or more, and at least one of the number of rows in the first plurality of rows and the number of columns in the first plurality of columns is one to the natural number of the number of rows in the second plurality of rows or the number of columns in the second plurality of columns, and wherein the micro plate treating device further comprises two or more magnets positioned between said nozzle heads and said micro plate and fitted to be relatively moved either within the second row interval and along a row of nozzles in the at least one pair of adjacent rows in the second plurality of rows, or within the second column interval and along a column of nozzles in the at least one pair of adjacent columns in the second plurality of columns, whereby the magnets can approach respective nozzles in either the row of nozzles or the column of nozzles and separated therefrom in such a manner that the magnets are brought into contact with, or are positioned at respective distances from, the respective nozzles so that a magnetic field is simultaneously applied to the insides of the respective nozzles.