Surgery – Instruments – Cutting – puncturing or piercing
Patent
1998-01-22
2000-05-23
Dawson, Glenn K.
Surgery
Instruments
Cutting, puncturing or piercing
604 22, A61B 1732
Patent
active
06066150&
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a surgical dissection instrument using a high-pressure liquid jet, also called a lancet, comprising a handpiece provided with means of generating and controlling a fine jet of said liquid, notably made up of physiological salt solution, and a device for supplying said handpiece with this high-pressure liquid.
BACKGROUND OF THE INVENTION
There are numerous known instruments of this type called lancets using a liquid jet. One of these instruments is for example described in the European publication No. 0 303 557 A3. The hand-operated instrument is equipped with a a manual control valve which is used to stop the pressurized flow of liquid during an operation. These valves are usually of complex construction due to the fact that they comprise at least one moving piece and a release spring designed to bring the moving piece back to its initial position. Due to this relative complexity, the handpiece becomes a costly piece which does not lend itself to being used once. However, the sterilisation requirements which are imposed on this type of instrument, and the problems posed when reusing it, particularly as regards the risks of contagion, make it virtually obligatory to use it once only.
Handpieces to be used only once already exist and are used in devices for irrigating and washing cuts, being supplied with a low-pressure or even air pressure liquid. Such handpieces are described for example in the American publications U.S. Pat. No. 4,519,385 and U.S. Pat. No. 5,147,292. Their design is completely incompatible with the technical constraints imposed in an instrument designed to dissect tissues and in which the pressure of the liquid can reach 70 bar.
Furthermore, the handpiece must have a ergonomic shape, fit in one hand and have all the function controls which can be operated easily using this hand's fingers. It must be possible to control it with one hand wearing a surgeon's glove, without the glove being subjected to constraints which might injure it. Furthermore, the fingers must be able to control the partial or total opening and closing of the jet of pressurised liquid instantaneously, quite effortlessly. The control manoeuvre has to be very flexible and quick given the precision requirements linked to the use of a lancet.
The main function of the handpiece is to control the supply and stop the supply of high-pressure liquid.
One advantageous secondary function is locking the liquid supply control in the stop position.
Finally, a third function is the suction function.
SUMMARY OF THE INVENTION
The surgical dissection instrument using a high-pressure liquid jet according to the invention, which overcomes the drawbacks of prior art and which offers an efficient and inexpensive way of fulfilling the main function, consisting in opening and stopping the liquid supply, is characterized in that: body extending from a near end-cap to a far end-cap, both ends being located significantly on the same axis, said body and extending from the far end-cap up to the near end-cap in a significantly rectilinear manner, said tube being designed to withstand a high pressure of at least 40 to 70 bar. comprise: high-pressure liquid jet and comprising, in an area close to the near end-cap, a fixed squeezing projection secured to said body, supporting said tube and arranged perpendicular to the latter, and a movable squeezing projection arranged opposite said fixed projection on the other side of said tube perpendicular to the latter, the two projections defining between them a space for said tube to pass, the movable projection being designed to move in relation to the fixed projection so as to reduce said space until it is cancelled, thus ensuring that said tube is fully squashed in a significantly perpendicular direction to the latter, a user, mounted in a corresponding housing located in the periphery of said body and articulating on a swivel pin in said body, this swivel pin being located between the near end-cap and the fixed squeezing projection, the control lever being provided wit
REFERENCES:
patent: 3713443 (1973-01-01), Fertik
patent: 4519385 (1985-05-01), Atkinson
patent: 5147292 (1992-09-01), Kullas et al.
patent: 5191881 (1993-03-01), Beck
patent: 5254083 (1993-10-01), Gentelia et al.
patent: 5254117 (1993-10-01), Rigby et al.
patent: 5336170 (1994-08-01), Salerno et al.
patent: 5496267 (1996-03-01), Drasler et al.
patent: 5643299 (1997-07-01), Bair
Dawson Glenn K.
Saphir Medical S.A.
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