| CPC A61B 5/4533 (2013.01) [A61B 5/0053 (2013.01); A61B 5/0057 (2013.01)] | 3 Claims |
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1. A multi-dimensional broad-spectrum clinical in-situ testing equipment for evaluating mechanical properties of a plantar soft tissue, comprising:
a testing table with a designated testing area corresponding to a sole of a foot;
a vertical reciprocating stress-strain testing unit mounted on the testing table, capable of applying vertical tensile and compressive stresses to the plantar soft tissue and measuring vertical reciprocating stress-strain responses;
a shear stress-strain testing unit, also mounted on the testing table, for applying transverse shear stresses to the plantar soft tissue and measuring shear stress-strain responses;
a torque stress-strain testing unit, positioned on the testing table, for applying torque to the plantar soft tissue and measuring torque stress-strain responses; and
a lifting mechanism that facilitates a vertical movement of the vertical reciprocating stress-strain testing unit, the shear stress-strain testing unit, and the torque stress-strain testing unit;
wherein the vertical reciprocating stress-strain testing unit, the shear stress-strain testing unit, and the torque stress-strain testing unit are arranged to face each other;
each of the vertical reciprocating stress-strain testing unit, the shear stress-strain testing unit, and the torque stress-strain testing unit includes a detection head, wherein the detection heads of the vertical reciprocating stress-strain testing unit, the shear stress-strain testing unit, and the torque stress-strain testing unit are distributed at equal angular intervals on the same circumference;
the shear stress-strain testing unit comprises a second driving motor, a second rotary-to-linear motion mechanism, a second detection probe, a second tension-compression sensor, a third tension-compression sensor, and a second displacement sensor;
the second rotary-to-linear motion mechanism converts a rotational motion output by the second driving motor into horizontal linear reciprocating motion to drive the second detection probe, which is the detection head of the shear stress-strain testing unit and is connected to the plantar soft tissue;
the second tension-compression sensor detects a pressure applied to the second detection probe by the plantar soft tissue in a transverse shear direction;
the third tension-compression sensor detects a pressure applied to the second detection probe by the plantar soft tissue in a vertical direction;
the second displacement sensor detects a displacement of the second detection probe during a testing process;
the second rotary-to-linear motion mechanism comprises a second eccentric wheel, a connecting shaft, a second linear guide rail, a third linear guide rail, an L-shaped plate, and a first square connecting piece;
a center of the second eccentric wheel is connected to an output shaft of the second driving motor that is vertically arranged;
an end of the connecting shaft is fixed to an edge of the second eccentric wheel, and the other end of the connecting shaft is connected to a slider of the second linear guide rail;
an end of the second tension-compression sensor is connected to the slider of the second linear guide rail through the L-shaped plate, and the other end the second tension-compression sensor is connected to a side of the first square connecting piece;
the second detection probe, the third tension-compression sensor, the first square connecting piece, and a slider of the third linear guide rail are connected sequentially;
the second displacement sensor is arranged beside the slider of the second linear guide rail;
the vertical reciprocating stress-strain testing unit comprises a first driving motor, a first rotary-to-linear motion mechanism, a first detection probe, a first tension-compression sensor, and a first displacement sensor;
the first rotary-to-linear motion mechanism converts a rotational motion output by the first driving motor into vertical linear reciprocating motion to drive the first detection probe, which is the detection head of the vertical reciprocating stress-strain testing unit and is connected to the plantar soft tissue;
the first tension-compression sensor detects a pressure applied to the first detection probe by the plantar soft tissue in the vertical direction;
the first displacement sensor detects a displacement of the first detection probe during the testing process;
the first rotary-to-linear motion mechanism comprises a first eccentric wheel, a first connecting rod, a first optical axis, a first linear bearing, a second linear bearing, and a first support frame;
a rotation center axis of the first eccentric wheel is connected to an output shaft of the first driving motor that is horizontally arranged, and an eccentric axis of the first eccentric wheel is connected to the first connecting rod that is horizontally arranged;
the first optical axis is connected to the first connecting rod;
the first linear bearing and the second linear bearing are respectively sleeved on both ends of the first optical axis, and the first linear bearing is connected to the first support frame;
the first detection probe is arranged at an upper end of the first optical axis;
the first tension-compression sensor is connected between the first detection probe and the first optical axis;
the first displacement sensor is installed on the first support frame and arranged beside the first optical axis;
the torque stress-strain testing unit comprises a third driving motor, a rotary-to-torsion motion mechanism, a third detection probe, a torque sensor, an angle sensor, and a fourth tension-compression sensor;
the rotary-to-torsion motion mechanism converts a rotational motion output by the third driving motor into horizontal torsional reciprocating motion to drive the third detection probe, which is the detection head of the torque stress-strain testing unit and is connected to the plantar soft tissue to be tested;
the torque sensor detects a torque applied to the third detection probe by the plantar soft tissue;
the angle sensor detects a rotation angle of the third detection probe during the testing process;
the fourth tension-compression sensor detects a pressure applied to the third detection probe by the plantar soft tissue in the vertical direction;
the rotary-to-torsion motion mechanism comprises an eccentric turntable, a fourth linear guide rail, a first pulley, a second pulley, a synchronous belt, a torsion spline, and a torsion coupling;
a center of the eccentric turntable is connected to an output shaft of the third driving motor that is vertically arranged;
a slider of the fourth linear guide rail is installed on an edge of the eccentric turntable;
a guide rail of the fourth linear guide rail is arranged horizontally and connected to an end of the torque sensor that is vertically arranged;
the other end of the torque sensor is connected to the first pulley;
the first pulley is connected to the second pulley through the synchronous belt;
the second pulley is sleeved on the torsion spline;
the third detection probe, the torsion spline, the torsion coupling, and the angle sensor are connected sequentially;
the fourth tension-compression sensor is arranged directly below the angle sensor;
the lifting mechanism comprises a driving component and a Z-axis screw slider module;
the driving component that is vertically arranged is connected to a screw of the Z-axis screw slider module; and
a slider of the Z-axis screw slider module is connected to and drives the vertical reciprocating stress-strain testing unit, the shear stress-strain testing unit, and the torque stress-strain testing unit to move up and down in the vertical direction.
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