P10007: Mechanical Spine Platform
/public/

Establish Target Specifications

Metrics

List of Metrics
Metric No. Metric Importance Units
1 Should be able to fit all required ranges needed by customer vertically 3 millimeters
2 Should be able to fit all required ranges needed by customer horizontally 3 millimeters
3 Must have a tilt in all directions relative to the section below 3 planes
4 Must have a minimum tilt in all directions relative to the section below 3 degrees
5 Must be movable in distinct sections and a fixed base (pelvis) 3 movable sections
6 Angle tolerance 3 degree
7 Minimal infrared reflectivity interference 3 percentage
8 Minimal electromagnetic interference 1 Amperes
9 Minimal electromagnetic interference 1 Coulombs
10 Overall cost 1 dollars
11 Device to measure linear displacement 3 inches
12 Sensors to measure rotation and/or tilt 3 degree
13 Device must mimic a person standing in an upright position 3 millimeters
14 Time needed for training 2 minutes
15 Time needed for adjustment to desired position 2 minutes
16 Time needed to collect all sensor measurements 2 minutes
17 Joint strength 3 psi
18 Durability after repeated movements 2 movement iterations
19 Overall weight 2 lbs
20 Allowable sensor placement area 3 square inches
21 Device has mechanical "zero" position 3 yes/no
22 Needs to stand on its own 3 yes/no
23 Digital output of measurements 3 yes/no
Linear Rating Scale: (Lowest) 0,1,2,3 (Highest)

Metrics vs. Needs

Metric-Needs Relationship

The table above represents the relationships between the engineering metrics and the generalized customer needs. An 'X' represents a relationship exists between them.

Ideal and Marginally Acceptable Target Values

Given the customer needs, awareness of the marketplace, and resource limitations of the current project, assign preliminary engineering specifications on each of the metrics. In addition to setting the nominal or target value or each specification, provide guidance to the team on the ideal value or direction that the team should strive for, once the nominal target values have been realized.

List of Metrics
Metric No. Metric Importance Units Base Plan Value Aggressive Value Outstanding Value
1.1 Should be able to fit all required ranges needed by customer vertically - Lumbar Region 3 millimeters 30 - 150 for each segment
1.2 Should be able to fit all required ranges needed by customer vertically - Thoracic Region 2 millimeters 200 - 300
2 Should be able to fit all required ranges needed by customer horizontally 3 millimeters 150 on each side
3 Must have a tilt in all directions relative to the section below 3 planes 3 (sagittal, transverse, frontal)
4 Must have a minimum tilt in all directions relative to the section below 3 degrees +/- 20
5 Must be movable in distinct sections and a fixed base (pelvis) 3 movable sections 2 (lower lumbar, upper lumbar) 3 (thoracic)
6 Angle resolution 3 degree +/- 0.1
7 Minimal infrared reflectivity interference 3 percentage 1 - 10 < 1
8 Minimal electromagnetic interference 1 Amperes
9 Minimal electromagnetic interference 1 Coulombs
10 Overall cost 1 dollars < 2000
11 Device to measure linear displacement 3 inches 1 inch increments
12 Sensors to measure rotation and/or tilt 3 degree +/- 1.0
13 Device must mimic a person standing in an upright position - Trochanterior Height 3 millimeters 750 - 1000
14 Time needed for training 2 minutes < 5 < 3
15 Time needed for adjustment to desired position 2 minutes < 1 < 0.75
16 Time needed to collect all sensor measurements 2 minutes < 1 < 0.5
17 Joint strength 3 Ft-lbs
18 Durability after repeated movements 2 movement iterations 1800 4000
19 Overall weight 2 lbs < 40 < 25 < 10
20 Allowable sensor placement area 3 square inches 1
21 Device has mechanical "zero" position 3 yes/no Yes
22 Needs to stand on its own 3 yes/no Yes
23 Digital output of measurements 3 yes/no Yes
Linear Rating Scale: (Lowest) 0,1,2,3 (Highest)

Home