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Spex
Member
Yes, Dr. Devroye visited my clinic and evaluated the Feller
Motorized instrument favorably. He explained his instrument to me and
while I agree that it produces good grafts , there are disadvantages
with his instrument compared to mine that I m sure he would agree
with.
The first is that it is quite large and bulky. For a few FUE grafts
that s OK, but over time it will increase fatigue.
The second is that there appears to be a set-screw utilized to fasten
the punch. It gets the job done, but mine has a custom made keyless
chuck which makes changing out punches a breeze.
The third is that Dr. Devroye s instrument is powered from an external
power source, mine is completely self contained and powered by an
onboard battery.
The forth is that mine does not need a wire exiting the back of the
unit which creates a leverage force that works against the operator
and just simply gets in the way. Think of the difference between a
corded telephone and a cell phone. No contest.
Another major difference is that my motorized instrument uses my
proprietary punches which reduce the amount of friction acting on the
graft when the tool is scoring down around the graft.
This is not diminish Dr. Devroye s inventiveness however . He is a
brilliant man and excellent surgeon who took the time to create his
own FUE tool that actually works. For that he deserves kudos.
The deeper the punch travels, the greater the chances for
transection or other damage. So it s best to score down as shallow as
possible. In order to cut the tissue deeper than the score we employ a
technique called follicular perforation whereby we simply poke at
the base of the partially freed graft with a needle while the graft is
under mild traction. This needle perforates the deep dermis allowing
the tissue to tear away with far less traction than if it were
brutally yanked out or removed slowly with the 2 forcepts technique
.
There is a variable speed control on the unit, but I prefer for
it to crank as fast as it can go. It goes through the skin like
butter. I put a fresh battery in at the beginning of each surgery and
have never run the battery down. The battery for the unit is available
just about anywhere and cost about $7
Last edited on Fri Jul 3rd, 2009 02:06 pm by Spex
Motorized instrument favorably. He explained his instrument to me and
while I agree that it produces good grafts , there are disadvantages
with his instrument compared to mine that I m sure he would agree
with.
The first is that it is quite large and bulky. For a few FUE grafts
that s OK, but over time it will increase fatigue.
The second is that there appears to be a set-screw utilized to fasten
the punch. It gets the job done, but mine has a custom made keyless
chuck which makes changing out punches a breeze.
The third is that Dr. Devroye s instrument is powered from an external
power source, mine is completely self contained and powered by an
onboard battery.
The forth is that mine does not need a wire exiting the back of the
unit which creates a leverage force that works against the operator
and just simply gets in the way. Think of the difference between a
corded telephone and a cell phone. No contest.
Another major difference is that my motorized instrument uses my
proprietary punches which reduce the amount of friction acting on the
graft when the tool is scoring down around the graft.
This is not diminish Dr. Devroye s inventiveness however . He is a
brilliant man and excellent surgeon who took the time to create his
own FUE tool that actually works. For that he deserves kudos.
The deeper the punch travels, the greater the chances for
transection or other damage. So it s best to score down as shallow as
possible. In order to cut the tissue deeper than the score we employ a
technique called follicular perforation whereby we simply poke at
the base of the partially freed graft with a needle while the graft is
under mild traction. This needle perforates the deep dermis allowing
the tissue to tear away with far less traction than if it were
brutally yanked out or removed slowly with the 2 forcepts technique
.
There is a variable speed control on the unit, but I prefer for
it to crank as fast as it can go. It goes through the skin like
butter. I put a fresh battery in at the beginning of each surgery and
have never run the battery down. The battery for the unit is available
just about anywhere and cost about $7
Last edited on Fri Jul 3rd, 2009 02:06 pm by Spex
Bigmac
Administrator
Staff member
Thanks Spex/Dr Feller for that.
One last question,
Quote
Another major difference is that my motorized instrument uses my
proprietary punches which reduce the amount of friction acting on the
graft when the tool is scoring down around the graft.
What is the difference in the punch which enables it to reduce the friction.
bm.
One last question,
Quote
Another major difference is that my motorized instrument uses my
proprietary punches which reduce the amount of friction acting on the
graft when the tool is scoring down around the graft.
What is the difference in the punch which enables it to reduce the friction.
bm.
Spex
Member
The inside shaft is expanded compared to the cutting surface.
So, for instance, if the punch has a .9mm cutting diameter, just BEHIND the cutting surface the shaft expands to a slightly wider diameter of, say, .95mm. This way a snug fit between the wall of the punch and the side of the graft is much more difficult to produce.
This is certainly important during manual FUE procedures, but is even all the MORE important when dealing with a punch that is motorized at very high speeds.
So, for instance, if the punch has a .9mm cutting diameter, just BEHIND the cutting surface the shaft expands to a slightly wider diameter of, say, .95mm. This way a snug fit between the wall of the punch and the side of the graft is much more difficult to produce.
This is certainly important during manual FUE procedures, but is even all the MORE important when dealing with a punch that is motorized at very high speeds.
Bigmac
Administrator
Staff member
Thanks Spex,much appreciated.
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