Article

[merrix]

It's a few years old, but gives a very thorough overview.

http://www.garber-online.com/pdf/Garber ... w_2008.pdf

[alibaba]

Page 5 graphic on the right shows pump volume on an AMS momentary squeeze pump to be 26.5 ml. My understanding of metrics is 1 ml is equal to 1 cc. The reservoir large size holds 100 cc. Given those numbers a person should be able to pump full hard with slightly less than 4 pumps. 100 divided by 26.5. Displacement is shown similar on other pumps. Who can empty the large size reservoir in less than 4 pumps? Who is harder than a fence post in less than 4 pumps? Corrections? Having used syringes for almost 50 years, I believe the correct volume to be 2.65 ml. Given the size of a 3cc syringe and converting that shape in my mind to a bulb, 2.65ml seems appropriate. 40 pumps to hard and reservoir empty seems more accurate too assuming full wall to wall pumps which one seldom succeeds beyond 20 pumps.

[JerGeezer]

40 pumps to hard and reservoir empty seems more accurate too assuming full wall to wall pumps which one seldom succeeds beyond 20 pumps.

This is the way it is for me.

[PFracture]

Wow!! Just wow! Thank you for sharing this. Gave it a quick look and was amazed at the technical content. I will definitely give it another look, but this time thoroughly.

[alibaba]

There is a lot of interesting information.

[Lost Sheep]

Page 5 graphic on the right shows pump volume on an AMS momentary squeeze pump to be 26.5 ml. My understanding of metrics is 1 ml is equal to 1 cc. The reservoir large size holds 100 cc. Given those numbers a person should be able to pump full hard with slightly less than 4 pumps. 100 divided by 26.5. Displacement is shown similar on other pumps. Who can empty the large size reservoir in less than 4 pumps? Who is harder than a fence post in less than 4 pumps? Corrections? Having used syringes for almost 50 years, I believe the correct volume to be 2.65 ml. Given the size of a 3cc syringe and converting that shape in my mind to a bulb, 2.65ml seems appropriate. 40 pumps to hard and reservoir empty seems more accurate too assuming full wall to wall pumps which one seldom succeeds beyond 20 pumps.

I did the math. The "pump displacement" figures for all three pumps are the rectangular volume of the box in which the entire pump and valve would fit. Most definitely NOT the amount of fluid the bulb could hold. I multiplied the height times width times depth. Simple.

If half the height of the assembly is bulb and the width and depth of the bulb match the rectangular width and depth dimensions, the volume of the bulbs would be 10.4 cc, 9.4 cc and 11.9 cc. I consider my estimate of the height guess to to be somewhat generous becaust the bulb is not a cylinder, but somewhat spherical.

I opine that even a "wall to wall" bulb compression would not deliver anywhere near the full bulb volume. I guess maybe half.

So, I will suggest a full squeeze of one of these pumps would deliver 4 to 5 cc to the implant.

Now, the implant inflatable cylinders. A cylinder 18mm x 20 cm is a volume of 51cc. 102cc for two cylinders. I will guess that a man who can deflate implant cylinders more than 95% is rare.

So fluid transfer (by my calculations) of under 100cc for a 20cm AMS CX for example seems reasonable. At (half capacity pumps) 2 to 2.5 cc per pump from completely empty to 100% full, 40 to 50 pumps seems reasonable. If we assume flaccidity of he imolant at 30% fill and full erection at 85% full, a fluid transfer of 55cc is seen. If we believe a man can get a full 4cc per pump, 10 pumps to get erect is expected.

All this is academic because I like to crunch numbers sometimes. But my estimates and calculations fo seem to match reality faily well I think.

Lost Sheep

[Lost Sheep]

Merrix,

GREAT FIND! Even though the article is 8-9 years old it answers a LOT of questions I have had no luck answering up to now.

THANK YOU for postng the link.

Lost Sheep

[alibaba]

Interesting find on the pump overall dimensions being called displacement. I deal with hydraulic pumps all the time and displacement is the volume per stroke not the overall dimensions of the pump. What were they thinking? Who cares how much ball sack volume is displaced by their glob of plastic? Goes back to the question I have asked here many times in the past several years. What is the actual volume of fluid pumped (displacement) per stroke of saline?

[Lost Sheep]

Interesting find on the pump overall dimensions being called displacement. I deal with hydraulic pumps all the time and displacement is the volume per stroke not the overall dimensions of the pump. What were they thinking? Who cares how much ball sack volume is displaced by their glob of plastic? Goes back to the question I have asked here many times in the past several years. What is the actual volume of fluid pumped (displacement) per stroke of saline?

By the reckoning outlined in my post, somewhere between 2 to 5 cc per squeeze.

Refinement to more cetainty would require better measurements than provided in the article.

Or, getting a pump bulb and actually measuring the flow. The empirical method.

Lost Sheep

[merrix]

One thing nobody mentions is the fact that a 20 cm cylinder does not have 20 cm inflatable length. There are fixed parts both in the rear and in the tip. I remember Eid showing me calculations on all 3 most commonly used implants and what ratio of inflatable length they had.
Two things were clear: Titans had higher inflatable ratio than CX and LGX. Longer cylinders had higher inflatable ratio than shorter cylinders.
Hence, the implants with the highest inflatable ratio is the Titan XL line, i.e. the 24, 26 and 28 cm models.
It was a year ago now, so I don't remember the exact numbers, but the inflatable ratio was surprisingly low. Even for the top models (Titan XL) it was not higher than 75% as I remember, and for the shorter AMS models as low as 65-70%.

So using myself as an example:
Titan XL 24 cm.
Inflatable ratio 75%
Inflatable length: 0.75*24=18 cm
Cylinder diameter: 2.1 cm
Cylinder radius: 1.05 cm
Cylinder volume (two cylinders): 2*1.05*1.05*3.14*18=125 cm^3=125 ml.
Reservoir size: 125 ml

I can do about 30 full pumps and 10 gradually lesser pumps. Let's assume the last 10 pumps on average are half pumps. So I do 35 full pumps.
Fluid per pump = 125/35=3.6ml.

Another example:

AMS LGX or CX
Cylinder length: 15 cm
Diameter: 1.4 cm
Radius: 0.7 cm
Inflatable length: 70%
Volume: 2*0.7*0.7*3.14*15*0.7=32 cm^3 = 32 ml
If we assume the fluid pumped with 1 pump is same as above (3.6 ml), then it would take 32/3.6=9 pumps to full inflation.
Massive difference, but so is the difference in volume between a long thick implant and a shorter thinner one.

Still in the same ballpark as your calculations.

And as a side note, Eid was convinced that a high inflatable ratio is a key performance indicator for a good implant. And, since RTEs effectively do decrease the inflatable proportion of the total implant, they should be avoided if possible and minimised when needed.