A pessary can be a simple means of managing pelvic organ prolapse. There are many different types, the simplest being the ring pessary.
The pessary is sized based on the outer diameter (OD) of the ring needed to fit the defined space.
|
Diameter in Inches |
Ring Size |
Diameter in mm |
|
1.75 |
0 |
44.45 |
|
2.00 |
1 |
50.80 |
|
2.25 |
2 |
57.15 |
|
2.50 |
3 |
63.50 |
|
2.75 |
4 |
69.85 |
|
3.00 |
5 |
76.20 |
|
3.25 |
6 |
82.55 |
|
3.50 |
7 |
88.90 |
|
3.75 |
8 |
95.25 |
|
4.00 |
9 |
101.60 |
|
4.25 |
10 |
107.95 |
|
4.50 |
11 |
114.30 |
|
4.75 |
12 |
120.65 |
|
5.00 |
13 |
127.00 |
diameter in inches =
= 1.75 + (0.25 * (ring size))
ring size =
= ((diameter in inches) - 1.75) * 4
diameter in inches =
= (outer cirumference in inches) / PI()
