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PROSTHETICS

Components Of Prosthetic Devices For Children

Hands

The VV series electric hands as shown, are known for their quality and reliability. They have been designed for child amputees in the one to eleven year age range. The "VV 0-3", "VV 2-6", "VV 5-9" and "VV 7-11" are aesthetic and lightweight, and can withstand the active life of a child, because of injection molded construction techniques.

 

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Hand Specifications For Children

Age range (yrs.)

0-3

2-6

5-9

7-11

Model - Basic 'D' hand - does not include wrist or controller

VV 0-3D

VV 2-6D

VV 5-9D

VV 7-11D

Weight (with harness - no wrist unit / no glove)

86gm (3.034oz)

126gm (4.444oz)

190gm (6.702oz)

198gm (6.984oz)

Dimension

Mm.(in.)

Mm.(in.)

Mm.(in.)

Mm.(in.)

 

Max. Width

A

48

1.90

53

2.10

65

2.58

65

2.57

Hand body / thumb tip

B

55

2.19

67

2.63

87

3.45

91

3.60

Lamination ring / thumb tip

C

67

2.67

80

3.15

100

3.94

103

4.09

Overall wrist diameter

D

33

1.31

40

1.57

40

1.57

40

1.57

Lamination ring -- outside diameter

E

29

1.12

37

1.46

37

1.46

37

1.46

Lamination ring -- inside diameter

F

24

0.94

30

1.19

30

1.19

30

1.19

Max. length

(excluding wrist)

G

59

2.35

70

2.77

94

3.73

98

3.80

Max opening

H

53

2.09

51

2.00

70

2.75

69

2.70

Finger opening depth

I

31

1.25

37

1.45

36

1.42

44

1.70

Length of longest finger

J

38

1.49

48

1.89

54

2.12

66

2.60

Quiescent current

<60 A

<60 A

<60 A

<60 A

<20 A

<20 A

<20 A

<20 A

Nominal operation voltage

4.8 v

6 v

4.8 v

6 v

4.8 v

6 v

4.8 v

6 v

Maximum current (motor)

260mA

260mA

340mA

340mA

1.4 A

1.4 A

1.4 A

1.4 A

Pinch force

3.5 LB

4.5 LB

5.0 LB

7.0 LB

6 LB

9.5 LB

6.5 LB

8.0 LB

15.57N

20 N

22.24N

31.14N

26.7N

42.26N

28.91N

35.6N

Maximum open time

1.5 sec

1.1 sec

1.2 sec

0.9 sec

1.4 sec

1.0 sec

1.1 sec

0.9 sec

Maximum close time

1.5 sec

1.1 sec

1.2 sec

0.9 sec

1.4 sec

1.0 sec

1.1 sec

0.9 sec

 

Knee/Leg

The theory in fitting infants with knee amputations has been that they are left without a knee joint and usually have to wait until they are a little older, perhaps around age three or more, before introducing a bending knee into the artificial leg.

The current trend is turning towards fitting young children with a bending knee joint right at the time of their very first fitting. Children seem to quickly and naturally adapt to a bending knee joint when it is provided right from the start.

There are however fewer options for children than adults on the market. Most options for children are single axis and polycentric designs.

The single axis device that a child would receive would be 3R38 and 3R39 by Otto Bock (the 3R39 has a manual lock)

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