a plurality of springs axially disposed in a tube, said plurality of springs having an Austenite state having a temperature T_1A, an Austenite final temperature A_fA and Martensite state having a temperature M_fA;

said tube having an Austenite state having a temperature T_1B, an Austenite final temperature A_fB and Martensite state;

said plurality of springs and said tube having a parent stage, compressed stage and dilated stage;

in said parent stage, said plurality of springs are at a temperature T_1A that is higher than said Austenite final temperature A_fA (T_1A>A_fA) with a spring diameter D₀₁;

in said parent stage, each of said plurality of springs define a first circumference;

in said parent stage, said tube is in said Austenite state at a temperature T_1B that is higher than said Austenite final temperature A_fB (T_1B>A_fB) with a tube diameter D₀₂ which is smaller than said spring diameter D₀₁;

in said compressed stage, said plurality of springs transform to said Martensite state by having a temperature lower than said Martensite temperature M_fA and are compressed to a diameter D₂ under external pressure P₂ created by said tube;

in said compressed stage, each of said plurality of springs define a second circumference which is smaller than said first circumference;

in said dilated stage, said plurality of springs transform to said Austenite stage by having a temperature T₃ greater than said Austenite final temperature A_fA;

in said dilated stage, said plurality of springs radially expand to a third circumference which may be the same as said first circumference, larger than said first circumference, or smaller than said first circumference but larger than said second circumference due to pressure exerted by said tube;

in said dilated stage, said tube transforms to said Martensite state due to internal pressure caused by said radial expansion of said plurality of springs and

wherein spring height increases when transitioning from said dilated stage to said compressed stage.