There are several types of micro pumps, including:

1. **Peristaltic pumps**: These pumps use a flexible tube that is compressed by rollers or a rotor to move the fluid. They are commonly used in medical and laboratory applications.

2. **Diaphragm pumps**: A diaphragm is used to create a pumping action by flexing back and forth. They are suitable for handling corrosive or abrasive fluids.

3. **Piston pumps**: Piston pumps use a reciprocating piston to draw in and push out the fluid. They can provide high pressure and are often used in industrial applications.

4. **Gear pumps**: Two gears mesh together to transfer the fluid from the inlet to the outlet. Gear pumps are known for their high efficiency and are used in various industries.

5. **Vane pumps**: Rotating vanes create a pumping action by trapping and displacing the fluid. They are commonly used in automotive and hydraulic systems.

6. **Jet pumps**: These pumps use a high-velocity jet of fluid to create a vacuum and draw in the fluid to be pumped. They are often used in shallow well applications.

7. **Centrifugal pumps**: Centrifugal force is used to move the fluid from the center of the impeller to the outer edge, creating pressure. They are widely used in many industries.

 

The choice of micro pump depends on factors such as the required flow rate, pressure, fluid compatibility, and application requirements.