Devices for detecting or filtering tumor cells

1. A micro-device comprising a micro-trench, a probe embedded alongside the trench's side walls or bottom floor, and a controlling circuitry, wherein the micro-device is capable of trapping, measuring, detecting, sorting, counting, analyzing, modifying, correcting, or communicating diseased cells in a biological subject by measuring a property of the diseased cells at microscopic level; wherein the probe comprise a flexible supporting structure, embedded alongside the trench's side walls or bottom floor, to support the probe and to extend or contract the probe relative to the trench's side walls or bottom floor, and the flexible supporting structure comprises a piezoelectric material.

2. The micro-device of claim 1 , wherein the width of the micro-trench ranges from about 0.5 nm to about 200 μm or from about 0.5 nm to about 50 μm, the depth of the micro-trench ranges from about 0.5 nm to about 200 μm or from about 0.5 nm to about 50 μm, and the length of the micro-trench ranges from about 1 nm to about 50 mm or from about 1 nm to about 10 mm.

3. The micro-device of claim 1 , wherein the probe comprises a conductive material and optionally a bio-compatible coating.

4. The micro-device of claim 1 , further comprising an array of trenches.

5. The micro-device of claim 1 , wherein the biological entity is a blood sample, a urine sample, a saliva sample, a tear sample, a sweat sample, or a lymph sample.

6. The micro device of claim 1 , wherein the probe is connected to the controlling circuit, and capable of receiving and executing instructions from the controlling circuit.

7. The micro device of claim 1 , wherein the probe is extended or contacted by the supporting structure in order to be able to move the biological subject.

8. The micro device of claim 1 , wherein the property to be measured at the microscopic level is 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.

9. The micro device of claim 8 , wherein the electrical property is surface charge, surface potential, resting potential, electrical current, electrical field distribution, surface charge distribution, cell electronic properties, cell surface electronic properties, dynamic changes in electronic properties, dynamic changes in cell electronic properties, dynamic changes in cell surface electronic properties, dynamic changes in surface electronic properties, electronic properties of cell membranes, dynamic changes in electronic properties of membrane surface, dynamic changes in electronic properties of cell membranes, electrical dipole, electrical quadruple, oscillation in electrical signal, electrical current, capacitance, three-dimensional electrical or charge cloud distribution, electrical properties at telomere of DNA and chromosome, capacitance, or impedance; the thermal property is temperature or vibrational frequency; the optical property is optical absorption, optical transmission, optical reflection, optical-electrical property, brightness, or fluorescent emission; the radiation property is radiation emission, signal triggered by radioactive material, or information probed by radioactive material; the chemical property is pH value, chemical reaction, bio-chemical reaction, bio-electro-chemical reaction, reaction speed, reaction energy, speed of reaction, oxygen concentration, oxygen consumption rate, ionic strength, catalytic behavior, chemical additives to trigger enhanced signal response, bio-chemical additives to trigger enhanced signal response, biological additives to trigger enhanced signal response, chemicals to enhance detection sensitivity, bio-chemicals to enhance detection sensitivity, biological additives to enhance detection sensitivity, or bonding strength; the physical property is density, shape, volume, or surface area; the biological property is surface shape, surface area, surface charge, surface biological property, surface chemical property, pH, electrolyte, ionic strength, resistivity, cell concentration, or biological, electrical, physical or chemical property of solution; the acoustic property is frequency, speed of acoustic waves, acoustic frequency and intensity spectrum distribution, acoustic intensity, acoustical absorption, or acoustical resonance; the mechanical property is internal pressure, hardness, flow rate, viscosity, fluid mechanical properties, shear strength, elongation strength, fracture stress, adhesion, mechanical resonance frequency, elasticity, plasticity, or compressibility.

10. The micro-device of claim 1 , wherein the diseased cells are circulating tumor cells 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.