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Need to Increase Syringe Mech Advantage

10/17/2013 2:19 AM

Need clever ideas to develop a simple mechanism to make it easier to depress a plunger of a large syringe. I volunteer at the worlds largest Raptor Rehab Center. Frequently we use 60cc plastic syringes to administer subcutaneous fluids, to rehydrate our patients. The problem is that many of our female techs have smaller, weaker hands. For that matter, some of our male techs also don't have the hand strength or size to smoothly depress the plunger of this large syringe.

The reasons for the problem is twofold. First off, when the syringe is at maximum capacity, the distance between the top of the plunger (where your thumb goes), and the body of the canister (where 1st & 2nd fingers go), is 5". That's a long stretch for a smallish hand.

Secondly, the pressure that needs to be applied is considerable, because the orifice of the needle is so small compared to body of syringe, which is 1" diameter.

These two things combine to make it very difficult to depress the plunger, for some people. The hand often shakes from the strain and the span, which makes it uncomfortable for the patient. Only one hand can be used, as the other hand is holding the leg, which is full of large sharp talons. I'm trying to come up with a solution.

One idea is something with the same principle of a caulking gun. Another idea is some type of scissor action. Both of these ideas change the orientation of the grip by 90 degrees... akin to the shape of a gun. This might not be ideal, as the tip of the needle must be well controlled, as far as accurate placement. But it's not out of the question.

One caveat to this challenge is that this needs to be somewhat "home-made". I need to be able to make this attachment by myself, with basic tools or OEM parts, without the advantages of an advanced machine shop or molds. It also must be easily removable, to be used on the next syringe.

Any ideas? May not be possible, but I'm giving it a shot. If anyone would like to join me in this challenge, suggestions would be appreciated. They would also be appreciated by our injured hawks, eagles, owls, osprey and vultures.

Perhaps something like this already exists?

Thank you.

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#1

Re: Need to Increase Syringe Mech Advantage

10/17/2013 2:37 AM

Just want to post this as an opener.

This is probably NOT what you need, because the syringe is moving,

http://www.chrisandjimcim.com/index.php?option=com_hwdvideoshare&task=viewvideo&Itemid=199&video_id=46

what you can use however is a battery operated actuator with a course, about the working length of the plunger. You can easily reverse the action when you use a DC type.

electric actuator is a start to google for I guess.

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#2

Re: Need to Increase Syringe Mech Advantage

10/17/2013 2:41 AM

Semco guns/tubes. They will require some small investment, and a small air compressor. The tubes are reusable. They make mechanical versions, also. And there are syringe needle adapters, too.

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#14
In reply to #2

Re: Need to Increase Syringe Mech Advantage

10/17/2013 11:31 AM

You could adapt a small dive tank, or an SCBA tank, to supply the air. I think one tank would last a long time. You may be able to talk your local fire station or dive shop into refilling it for free since it is for a good cause.

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#3

Re: Need to Increase Syringe Mech Advantage

10/17/2013 2:46 AM

http://www.servocity.com/html/12v_linear_actuators.html
This is a good start too. Just for your info. I have plenty of those in the house to adjust flaps in the central AC outlets. They come in many weights, strengths and sizes.This needs power.

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#4

Re: Need to Increase Syringe Mech Advantage

10/17/2013 2:58 AM

I can't use power. Not always in a location where it is available. But I'm going to read up on the mechanical version of lyn's suggestion.

Oh... and the air compressor wouldn't work, because of the noise. These birds are normally stressed out, in pain, and sometimes in some form of shock. So silence is required, in order to not stress them any more than necessary.

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#5
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Re: Need to Increase Syringe Mech Advantage

10/17/2013 3:04 AM

Something different is a rubber band that can be put over the syringe and plunger to give a pre- tension and takes a big part of the load of your fingers. Eventually you can just make it that strong that you need to hold the plunger from sliding automatically? Elastic wide band.

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#6
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Re: Need to Increase Syringe Mech Advantage

10/17/2013 3:08 AM

Hmmm... interesting train of thought. Might be some possibilities in that direction. I hadn't considered that. I was thinking levers. But tension/compression might be worth some thought.

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#13
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Re: Need to Increase Syringe Mech Advantage

10/17/2013 11:27 AM

You could use surgical tubing as the rubber band. Many grades/strengths.

http://www.mcmaster.com/#surgical-tubing/=oz5l7u

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#7

Re: Need to Increase Syringe Mech Advantage

10/17/2013 3:14 AM
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#8

Re: Need to Increase Syringe Mech Advantage

10/17/2013 5:09 AM

I think it's the distance of the span that's getting them.

Look at this part...

the top of the plunger (where your thumb goes), and the body of the canister (where 1st & 2nd fingers go), is 5".

....and create a small plastic part, (PVC pipe?), that hooks to the body of the syringe where the fingers go, use some heat to create a stepper ledge at about 2.5", (where the 1st & 2nd fingers go), so they can can empty the top half of the syringe as if the whole thing was 2.5 inches long, remove the plastic adapter, and finish the last half of the syringe.

Here's a horrible picture, but hopefully close enough:

The top is the plunger, and the opening on the bottom would slide over the syringe body, (from the side), and hook under the finger part. I think by cutting the span in half, they could comfortably use the ball of their thumb to do the pressing, which is much stronger than the end of the thumb.

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#9
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Re: Need to Increase Syringe Mech Advantage

10/17/2013 6:29 AM
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#10

Re: Need to Increase Syringe Mech Advantage

10/17/2013 6:45 AM

Another idea would be to run a piece of flexible IV tubing between the syringe and the needle. This would allow the workers to use two hands on the syringe, and alleviate the need to keep it perfectly still.

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#11

Re: Need to Increase Syringe Mech Advantage

10/17/2013 8:23 AM

Did you try googling 'battery powered syringe'? Here's one example. I saw a bunch on ebay.

http://www.coleparmer.com/Category/ProSpense_Battery_Powered_Syringe_Pumps/58440

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#12

Re: Need to Increase Syringe Mech Advantage

10/17/2013 10:55 AM

I would use some mounting device for the syringe that had a wind up spring mechanism, that would upon release depress the plunger of the syringe....the rate of delivery being controlled by geared mechanism controlled by compression force....

This is something that maybe it might look like....without the tubing....maybe the wheel for spring windup, a push button release, with a screw in brake mech....

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#15
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Re: Need to Increase Syringe Mech Advantage

10/17/2013 11:35 AM
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#16
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Re: Need to Increase Syringe Mech Advantage

10/17/2013 11:42 AM

Too bad they don't have a button for Cool Answer

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#26
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Re: Need to Increase Syringe Mech Advantage

10/18/2013 11:25 AM
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#17

Re: Need to Increase Syringe Mech Advantage

10/17/2013 5:26 PM

Sounds to me like your syringe would fit in an ordinary caulking gun (9 or 13 inch is standard) - wouldn't need much modification, and should give reasonable flow control for a smooth delivery of the fluids. Maybe a rubber grip on the plunger end to prevent slipping; a smaller diameter ring to fit the syringe into the tube ring..

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#18

Re: Need to Increase Syringe Mech Advantage

10/17/2013 11:22 PM

How large is the pad at the end of the plunger? Would it be possible to drill a hole and loop a stiff wire through the hole? If you manufactured out of stiff wire such as a coat hanger into a shape similar to an "S" if the index and middle fingers on the "T" of the syringe them thumb would be free to slip into a loop on the opposite end of the wire. It might require repositioning after the initial push of the plunger but the ease of operation might be maintained. We did something similar with some meds we needed to give our Horses through large syringes and it made things much easier on my Wife if I wasn't there.

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#19

Re: Need to Increase Syringe Mech Advantage

10/17/2013 11:52 PM

Try this mob

If the link doesn't work, google Tulip power injector

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#20
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Re: Need to Increase Syringe Mech Advantage

10/18/2013 12:47 AM

Well. I'm not sure there could be a more perfect solution than this.

Not yet sure if it is the answer I'm looking for... until I get some pricing information (I'm doing this on my own dime), but this is quite literally exactly the existing product I was asking about. Nice one, bwilko!

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#23
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Re: Need to Increase Syringe Mech Advantage

10/18/2013 4:18 AM

Don't be too proud to beg, I work with a local charity & have found that companies can be extremely generous with their products when you explain that it's for a good cause. You may end up with an ex-demonstrator model but as long as it works............

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#29
In reply to #23

Re: Need to Increase Syringe Mech Advantage

10/18/2013 6:14 PM

I just did... and they did

Tulip Medical is sending me a $700+ Universal Power Injector! Free of charge.

Situation solved! Thanks to everybody, for use of your grey matter.

And thanx again to bwilko, for finding the exact product I needed.

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#30
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Re: Need to Increase Syringe Mech Advantage

10/18/2013 9:29 PM

Fantastic result.

Glad to see that they are a community minded company who are willing to assist those who put themselves out there.

Hope it does the job.

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#31
In reply to #23

Re: Need to Increase Syringe Mech Advantage

10/21/2013 11:02 AM

Exceptional suggestion, Nigh!

.

Many great answers come as descriptions of realistic effective solutions to a problem. Your suggestion prompted the necessary steps to actually procure the best solution.

.

Great work!

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#21

Re: Need to Increase Syringe Mech Advantage

10/18/2013 12:54 AM

Okay, a lot of good food for thought here. Some more practical than others, but all good out of box thinking. I appreciate the input and effort. I'm looking into and considering several of your ideas. There is no rush on this project, but if and when I end up with something suitable, I'll keep y'all up to date.

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#22

Re: Need to Increase Syringe Mech Advantage

10/18/2013 3:04 AM

you could try THIS

or THIS

failing my two suggestions, local pub darts team!!

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#24

Re: Need to Increase Syringe Mech Advantage

10/18/2013 7:18 AM

Try contacting your local hospital medical electronics department and see if they no longer need a battery powered syringe pump or dosing pump. Your application is standard practice. The pumps can be set to run at different speeds

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#25

Re: Need to Increase Syringe Mech Advantage

10/18/2013 10:53 AM

http://www.jindalmedical.com/Opthalmic/silicon-oil-injector.htm

This appears to be too small for your requirement, nevertheless give a possible idea...

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#27

Re: Need to Increase Syringe Mech Advantage

10/18/2013 1:44 PM

My wife, a Registered Nurse of 36 years, suggested that you use a smaller syringe and inject twice. No need for complicating things. No need for fancy costly gadgets.

That's how the nurses do in the hospital.

***KISS***

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#28
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Re: Need to Increase Syringe Mech Advantage

10/18/2013 2:05 PM

KISS is good, but first you have to be sure what qualifies as Simple. The nurses at the hospital are probably injecting into a tube that's already intravenously installed... and not stabbing the patient's flesh twice.

In either case, a raptor's skin is extremely thin in the web area where subcutaneous injections are given. Making two holes instead of one, during each treatment means twice as many holes to leak back out of. Some birds would soon be perforated to the extent that you'd need to use unconventional sites to inject, or you'd just have all the fluid leak back out. And that just complicates things. And with a strong bird struggling, the first stick can sometimes go wrong. So that would be twice the chance of a bad placement. Additionally, you'd have to prepare two syringes each time, which takes more time and uses more resources.

So, a fancy gadget would still probably help.

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#32

Re: Need to Increase Syringe Mech Advantage

10/28/2013 6:11 PM
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