What Design Features Make a Cell Adhesion Force Measurement Instrument More Reliable?

　　Cell Adhesion Force Measurement Instrumentis a specialized instrument for precisely measuring interaction forces between cells and a substrate, with important applications in cell biology, biomedical engineering and related fields. By accurately measuring these interactions, it helps researchers understand cell behavior and disease mechanisms and develop new treatments. For example, the CellHesion 200 system from Germany’s JPK measures cell–cell and cell–substrate interactions, quantitatively measures cell elasticity and responses to external mechanical pressure, and provides single-cell quantitative results with single-molecule precision. Its innovative method supports cell-interaction research with high-quality data, and its software automatically determines key parameters related to cell adhesion force.

　　Cell Adhesion Force Measurement Instrumentdetailed structure:

　　1. Main frame and vibration-isolation platform (foundation)

　　Optical vibration-isolation base: a marble vibration-isolation table blocks floor vibration and prevents drift in minute force readings;

　　Vertical gantry frame supporting the probe-motion module and optical imaging system;

　　Leveling feet and a bubble level ensure that the work surface is perfectly level.

　　2. Three-dimensional precision positioning system (core actuator)

　　Z-axis vertical piezoelectric ceramic module: nanometer-scale vertical motion controls probe approach and retraction and acquires adhesion–detachment curves;

　　X/Y-axis precision motorized stage: moves the cell culture dish to switch among individual cells for observation;

　　Closed-loop displacement sensor provides real-time probe-position feedback with nanometer-scale positioning accuracy.

　　3. Microforce sensing and detection unit (force-measurement core)

　　Microcantilever probe (AFM)/microchannel probe (FluidFM): an ultrathin silicon cantilever with cells or bound matrix proteins functionalized at its tip;

　　Laser-emission module + position-sensitive detector (PSD): a laser strikes the end of the cantilever, whose deformation changes the spot position so adhesion force can be calculated;

　　Signal-amplification circuit: amplifies and denoises weak photoelectric signals before transmission to the industrial control computer.

　　4. Inverted optical imaging and observation system

　　Inverted fluorescence/phase-contrast microscope: objective, eyepiece, and light source;

　　CCD high-definition camera: real-time imaging and visual positioning of the target single cell;

　　Fluorescence light-source assembly: supports labeling of the cytoskeleton and adhesion molecules for observation.

　　5. Fluid-flow control module (exclusive to FluidFM models)

　　Precision pressure controller: adjusts positive and negative micropressure to hold a single cell at the probe tip;

　　Microfluidic tubing, buffer reservoir, and waste collection trough;

　　Constant-temperature fluid circulation maintains the cells at the physiological temperature of 37℃.

　　6. Constant-temperature cell culture chamber

　　Sealed culture-dish stage;

　　Temperature-control module + 5%CO₂ mixed-gas supply simulates the in vitro physiological environment;

　　Humidifier prevents medium evaporation and concentration.

　　7. Data acquisition and industrial control system

　　High-speed acquisition card: synchronously acquires force signals, displacement, and images;

　　Industrial control computer;

　　Matched display, operating keyboard, and mouse;

　　Professional analysis software: automatically plots force–distance curves and calculates detachment force, work of adhesion, and stiffness.

　　8. Supporting consumables

　　Probe microcantilevers, cell culture dishes, dedicated matrix-coating reagents, buffer, and waste container.