Devices for detecting or filtering tumor cells

1. A device comprising:

two micro-filters, each having a well;

a shutter, wherein the shutter is sandwiched between the two micro-filters and is located close to the well of one of the micro-filters, and the shutter is capable of moving and blocking a pathway between the wells of the two micro-filters;

a cell counter, positioned at an entrance or exit of the well of the micro-filter, and capable of detecting a cell passing through the well; and

a timer, capable of controlling the position or movement of the shutter,

wherein the device is capable of filtering circulating tumor cells.

2. The device of claim 1 , wherein the micro-filter filters circulating tumor cells by an electrical, magnetic, electromagnetic, thermal, optical, acoustical, biological, chemical, electro-mechanical, electro-chemical, electro-optical, electro-thermal, electro-chemical-mechanical, bio-chemical, bio-mechanical, bio-optical, bio-thermal, bio-physical, bio-electro-mechanical, bio-electro-chemical, bio-electro-optical, bio-electro-thermal, bio-mechanical-optical, bio-mechanical thermal, bio-thermal-optical, bio-electro-chemical-optical, bio-electro-mechanical-optical, bio-electro-thermal-optical, bio-electro-chemical-mechanical, physical, or mechanical property, or a combination thereof.

3. The device of claim 1 , wherein each micro-filter is integrated with two cell counters with one of which installed at the entrance of each well, while the other installed at the exit of each well.

4. The device of claim 1 , wherein the timer is capable of resetting the shutter to a default position, from which the shutter moves at a preset speed toward the pathway, thereby blocking the pathway.

5. The device of claim 4 , wherein the cell counter is configured to trigger the timer.

6. The device of claim 1 , wherein the shape of the well is rectangle, ellipse, circle, or polygon.

7. The device of claim 1 , wherein the micro-filter's dimension ranges from about 0.1 μm to about 500 μm.

8. The device of claim 1 , wherein the micro-filter's dimension ranges from about 5 μm to about 200 μm.

9. The device of claim 1 , wherein the micro-filter is coated with a biological or biocompatible film.

10. The device of claim 1 , wherein the tumor cells are from prostate cancer, lung cancer, colon cancer, breast cancer, brain cancer, cervical cancer, Hodgkin's lymphoma, non-Hodgkin's lymphoma, kidney cancer, leukemia, liver cancer, ovarian cancer, skin cancer, testicular cancer, thyroid cancer, pancreatic cancer, endometrial cancer, esophageal cancer, or uterine cancer.

11. A device comprising:

at least two micro-filters, each of the two micro-filters having a well, wherein each well is integrated with two cell counters, including one cell counter installed at the entrance of the well and another cell counter installed at the exit of the well;

a shutter, located close to the well of one of the micro-filters; and

a timer, capable of controlling the position or movement of the shutter,

wherein the shutter is sandwiched between the two filters and is controlled by the timer;

wherein at least one of the cell counters is capable of triggering the timer when a cell passes through the well of the filter;

wherein the timer is capable of resetting the shutter to the default position, and the shutter is capable of moving at a preset speed toward the pathway formed between the two wells of the respective filters, thereby allowing only cells with a sufficient speed to get through the pathway before the shutter closes the pathway;

wherein the device is capable of filtering circulating tumor cells.

12. A device comprising:

two micro-filters, wherein each of the two micro-filters has a well and is integrated with two cell counters with one of which installed at the entrance of each well, while the other installed at the exit of each well, and at least one of the cell counters is capable of detecting a cell passing through the well;

a shutter, located close to the well of one of the micro-filters, and capable of moving and blocking a pathway to or from the well; and

a timer, capable of controlling the position or movement of the shutter,

wherein the device is capable of filtering circulating tumor cells.