In context
In late 2024, unmanned rescue robotics was a growing focus for military and disaster-response applications, particularly for tasks too dangerous for human medics. Rapid control of severe limb bleeding—a leading cause of preventable death on the battlefield—remained a critical challenge, and existing pneumatic tourniquets required manual placement. This paper from the State Key Laboratory of Robotics in Shenyang addressed that gap by proposing a robotic end-effector capable of autonomous compression hemostasis.
What was reported
Researchers designed a rigid-soft hybrid hemostatic manipulator mountable on a rescue robotic arm. The device combines a rigid underactuated gripper with two inner TPU airbags (0.3 mm thick). The gripper, driven by a cable and torsion springs, adaptively envelops limbs up to 180 mm in diameter, with a maximum opening of 290 mm. A locking mechanism using push-pull electromagnets stabilizes the gripper during airbag inflation.
The airbags inflate to compress the wound, with the rigid structure constraining radial expansion. Kinematic and static models were derived using D-H parameters and virtual work principle, relating cable tension to contact forces. A finite element model in Abaqus simulated airbag deformation and contact with a simplified limb (soft tissue modeled as elastic, E=1.0e5 Pa). At 50 kPa airbag pressure on a 140 mm limb, tissue displacement reached about 11 mm.
A theoretical model estimated squeezing pressure based on limb diameter, predicting a usable range between D_min and D_max. Experiments on human upper and lower limbs confirmed reliable clamping and hemostatic performance.
Why it mattered
This work demonstrated a practical approach to automating compression hemostasis in hazardous environments, potentially reducing medic exposure and improving survival rates. The hybrid design balanced safety and force, offering a template for future rescue end-effectors that require both gentle contact and high holding capability.
"The experimental results show that the manipulator has reliable clamping and hemostatic abilities, which verifies its effectiveness."
Source: 《机器人》期刊 (robot.sia.cn) · Published 2024-11-15 · “刚柔混合止血机械手的设计与分析”