Design – ComfortLift

Initial Designs for the ComfortLift:

Device A – Patient Transfer

Design Solution A.01 – Inflatable Roll

Variable inflatable tubes that create an initial slope for the transportation of that patient across the table.

Design Solution A.02 – Conveyer Belt

Conveyer belt on top of table with initial pull of patient across from belt rotation.

Design Solution A.03 – Winch Hook

Winch That attaches to a fabric underneath patient and pulls them across transfer surface

Chosen Design: Design Solution A.03 – Winch Hook

Decision Matrix

Design Criteria	Manpower Reduction	Overall Cost	Expected Comfort	Complexity	Ease of Use	Patient Safety	Total
Design A.01	01	02	02	03	03	02	13
Design A.02	02	03	01	03	02	02	13
Design A.03	02	01	02	01	01	01	08

Device B – Bridge/Support

Design Solution B.01 – Lift Center Table

Transfer table with 2 adjustable supports at the front and end of the table.

Design Solution B.02 – Lift Corner Table

Table with adjustable legs located at each corner of the table.

Chosen Design: Design Solution B.01 – Lift Center Table

Decision Matrix

Design Criteria	Manpower Reduction	Overall Cost	Expected Comfort	Maneuverability	Ease of Use	Safety	Total
Design B.01	01	02	01	02	01	01	08
Design B.02	03	02	01	02	01	01	11

Material Analysis

Option A: Stainless Steel: Factor of Safety: 2

Option B: Aluminum Alloy: Factor of Safety: 2

Option C: Polyethylene: Factor of Safety: 2

Device B Material Selection – Decision Matrix

Design Criteria	Strength (MPa)	Overall Cost ($/ft²)	Expected Comfortability	Ability to Sanitize	Expected Deformation (mm)	Total
Stainless Steel	500	187	1	1	0.4	7
Aluminum Alloy	420	8.81	1	1	1.2	8
Polyethylene	20	3.75	1	2	70.6	10

Best Material Overall: Stainless Steel

Best Materials On Budget: Polyethylene & Stainless Steel

ANSYS Test For Combined Material Selection

Winch Selection

Haul Master Manual Strap Winch:

$27.99
S-Hook
900 lb
20 ft

Haul Master Manual Strap Winch:

$27.99
S-Hook
900 lb
20 ft

Haul Master Manual Strap Winch:

$27.99
S-Hook
900 lb
20 ft

Winch Material Selection – Decision Matrix

Design Criteria	Strength to Cost Ratio	Gear Ratio	Total Weight	Crank Design	Hook Type	Cost	Total
Stainless Steel	32.1	4:25:1	900	Stick	S-type	28.0	10
Aluminum Alloy	28.5	3:1	600	Handle	Spring gate	22.0	11
Polyethylene	53.3	4:1	1400	Handle	Spring gate	31.0	8

Best Winch Choice: Yulizhe

Initial Designs for the ComfortLift:

Device A – Patient Transfer

Chosen Design: Design Solution A.03 – Winch Hook

Decision Matrix

Device B – Bridge/Support

Chosen Design: Design Solution B.01 – Lift Center Table

Decision Matrix

Material Analysis

Option A: Stainless Steel: Factor of Safety: 2

Option B: Aluminum Alloy: Factor of Safety: 2

Option C: Polyethylene: Factor of Safety: 2

Device B Material Selection – Decision Matrix

ANSYS Test For Combined Material Selection

Winch Selection

Final Design: A.03: Winch Hook, B.01: Center Table, Options C: Stainless Steel & Option A: Polyethylene