Description:3D model is made using CAD software accordingly contains components required for the model is bought and tested. The base was made from the PLA (Polylactic acid)(1) and the sensor circuit structure was made by silver conducting paste(2), which was screen printed according to the 2D model. Pressure sensors 4cm x 4.6cm scale with 4 electrodes are attached to the load cell which is connected to impedance analyzer device which is used detect the resistance variation under suitable load. The degradibility test is conducted in order to understand the rate of degradation with respective time and temperature. The chemical reagents used for the degradibilty test are: Hydrogen Peroxide Solution, Buffer solution, Fenton Reagent. Here the six samples of the sensor are placed in 6 different beakers having 3 types of reagents in which each type of solution will have 2 sensors each. Before placing the sensors in the solution, the weight of the sensor is measured using density measuring instrument and then the Ph values of the solutions are measured after immersing the sensors into the solution. After which the beakers containing the samples will be placed in an oven to maintain a constant temperature of 37℃ to replicate the body temperature. This data will be used to compare the results after 7 days.
This biodegradable pressure sensor will be a huge boon to all humanity as it will be able to provide live data of pressure and strain acting on the injured bone which will be useful in recovery and rehabilitation. With this data the doctor can access the recovery and tailer the activities of the injured bone.
Screen printing process is chosen as the fabrication method for the development of biodegradable pressure sensor as it is of low cost and easily available method.
Screen printing involves 5 major steps:
• Design creation
• Preparing the screen
• Exposing the emulsion
• Creation of the stencil
• Printing
Design creation: The design is either drawn or printed on a transparent acetate film. In this case the design is prepared on Catia V5 according to the calculations and the drawing is printed on a transparent acetate film which will be used to create the screen.
Preparing the screen: The screens are made up of silk or nylon or polyester mesh emulsion liquids undergo reaction when exposed to uv light which allows it to harden. The emulsion liquid is applied on both sides of the mesh equally using a sneeze and this must be done at low light or dark room.
Creation of the stencil: The drawing sheet must be placed over the mesh on one side and a glass pane must be placed on it to ensure if the transparency is flat against the screen. This is then exposed to bright sun light or uv light. The exposed area is hardened, and unexposed area is washed away using water as it is soft.
The microstructure of the sensor sample was observed under the Optical Metallurgical Microscope to observe and analyse the bonding between the silver particles and the base material PLA. It will help us knowing the distribution of sliver paste onto the base material PLA.
, Claims:We claim,
1. A pressure sensor (2) to detect Stress Shielding Effect comprising;
A PLA (Polylactic acid) as base material(1) and silver conducting paste (2) as conducting material which will help in transmitting the accurate readings of strain and pressure acting on the injured bone with periodically degradability to which the doctor can tailor the day-to-day activities and help in faster recovery of the patient.

2. A pressure sensor(2) as claimed in claim 1, wherein device used for monitoring the stress shielding effect that occurs between healing femur bone and internal fixation devices attached.