Biopsy needle, sample extracting unit, biopsy apparatus, and method of controlling biopsy needle

1. A biopsy needle comprising:

an outer tube having a hollow cylindrical shape; and

an inner tube having a hollow cylindrical shape and which is movably disposed within the outer tube for movement in an axial direction or a circumferential direction;

wherein the inner tube has a plurality of inner openings defined in a side wall thereof; and

the outer tube has a single outer opening defined in a side wall thereof, an opening area of the outer opening being greater than an opening area of each of the inner openings, and in response to movement of the inner tube, the outer opening selectively overlaps one of the plurality of inner openings thereby to define a communication port which communicates with an interior of the inner tube.

2. The biopsy needle according to claim 1 , wherein the inner openings are disposed so as not to overlap each other in the axial direction of the inner tube.

3. The biopsy needle according to claim 1 , wherein the inner openings are disposed in respective positions which are different from each other in the axial direction of the inner tube.

4. The biopsy needle according to claim 1 , wherein the inner openings have respective opening areas which are different from each other and have respective centers of gravity disposed on one circumferential line.

5. The biopsy needle according to claim 1 , wherein the inner openings have respective opening areas which are identical to each other.

6. A sample extracting unit comprising:

a biopsy needle according to claim 1 ; and

an aspirating mechanism for aspirating a mass which is disposed near the communication port defined by the outer tube and the inner tube, into the inner tube.

7. The sample extracting unit according to claim 6 , wherein the aspirating mechanism has a changeable aspirating pressure.

8. The sample extracting unit according to claim 7 , further comprising:

a positional information input section for inputting positional information of the biopsy needle and the mass; and

an aspirating pressure determiner for determining the aspirating pressure for the aspirating mechanism based on the positional information input by the positional information input section.

9. The sample extracting unit according to claim 8 , further comprising:

an opening information recorder for recording opening information about the outer opening and the inner openings; and

an inner tube movement distance determiner for determining a movement distance of the inner tube based on the positional information input by the positional information input section and the opening information recorded by the opening information recorder.

10. A biopsy apparatus comprising:

a sample extracting unit according to claim 6 ;

a radiation source for applying a radiation to an object to be examined of a subject;

a radiation detector for detecting the radiation which has passed through the object and converting the detected radiation into a radiographic image; and

a position calculator for calculating a three-dimensional position of a biopsy region in the object based on two radiographic images which are generated by the radiation detector in an image capturing process which is performed by applying the radiation from at least two angular positions to the object with the radiation source.

11. The biopsy needle according to claim 1 , wherein the outer opening is of a rectangular shape which is elongate in the axial direction.

12. A biopsy needle comprising:

an outer tube having a hollow cylindrical shape; and

an inner tube having a hollow cylindrical shape and which is movably disposed within the outer tube for movement in an axial direction or a circumferential direction;

wherein the inner tube has a plurality of inner openings defined in a side wall thereof;

the outer tube has at least one outer opening defined in a side wall thereof, an opening area of the at least one outer opening being greater than an opening area of each of the inner openings, and in response to movement of the inner tube, the at least one outer opening selectively overlaps one of the plurality of inner openings thereby to define a communication port which communicates with an interior of the inner tube; and

a circumferential length of the outer opening is greater than a circumferential length of each of the inner openings, and/or an axial length of the outer opening is greater than an axial length of each of the inner openings.

13. The biopsy needle according to claim 12 , wherein the inner openings are disposed in respective positions which are different from each other in the axial direction of the inner tube.

14. A biopsy needle comprising:

an outer tube having a hollow cylindrical shape;

an inner tube having a hollow cylindrical shape and which is movably disposed within the outer tube for movement in an axial direction or a circumferential direction; and

a tube cutter movable in the axial direction and having a cutting face on a distal end;

wherein the inner tube has a plurality of inner openings defined in a side wall thereof; and the outer tube has at least one outer opening defined in a side wall thereof, an opening area of the at least one outer opening being greater than an opening area of each of the inner openings, and in response to movement of the inner tube, the at least one outer opening selectively overlaps one of the plurality of inner openings thereby to define a communication port which communicates with an interior of the inner tube.