CN103126764A - Electric cutter pen electrode - Google Patents

Abstract

The invention provides an electric cutter pen electrode. A front cutting edge portion (4) of the electrode is a front cutting edge portion provided with a cutting edge shape, and the front cutting edge portion (4) is so sharp that even on the condition of being not energized, the cutting edge of the front cutting edge portion (4) can be used for a part of cutting and separating. Included angles of two sides of the front cutting edge portion (4) are 55-65 degrees. The sharper the position, where the electric cutter pen electrode is arranged, of an energized conductor is, the larger the surface charge density is, and the stronger the generated electric field intensity is. The electric field intensity is bound to be relatively improved. On the condition of using relative fixed output power, electric slivering effect is improved. On the condition of the same effect, according to a tissue to be cut, the corresponding output power can be reduced by 10%-30%.

Description

The pencil electrode

Technical field

The present invention relates to a kind of high-frequency electrical surgical operating instrument, specifically refer to the electrode that uses on a kind of high-frequency electrotome pen.

Background technology

The use history of the existing many decades of high frequency electric knife (a kind of heat effect of utilizing high frequency electric is completed the surgical apparatus of cutting and blood coagulation).Pencil is its main accessories as operating grip.Now widely use as disposable attachment.Just think at the beginning of using electric knife TURP the shape of coagulation effect and electrode have nothing to do, so the shape of electrode just continues decades consistently.At present, electrode the most commonly used is knife structure electrode, and circle is beaten at " blade " position on its both sides, after switching on, by the heat effect effect of high frequency electric, blood coagulation is cut by biological tissue.

Just there is great risk the high-frequency electrical surgery in itself, its risk has very large some to come from the pair damage that heat effect is brought, how to reduce this risk, one of its effective measures are exactly that International Electrotechnical Commission (IEC) proposes: the output of reduce electric knife, with as far as possible little power, complete safely operation.Therefore, be devoted to research and develop a kind of in art always, how improve the electrode on pencil, can use as far as possible little power, the performing the operation of effective and safe.

Summary of the invention

Pencil electrode of the present invention is to keep original external electrical characteristic, does not change on doctor's the basis of traditional electrical writing of indictments, appeals, etc. structure of operating habit, the geometry of electrode is improved the performing the operation of effective and safe.

In order to realize purpose of the present invention, the technical scheme of proposition is as follows:

A kind of pencil electrode, the front blade of front blade 4 for having knife-edge of described electrode is even the sharpness of its front blade 4 in cold situation, utilizes its blade can carry out fraction ground cutting and separate.

The angle on described front blade 4 both sides is the 55-65 degree, and best angle is 60 degree.

The sharper place of pencil electrode of the present invention shape on energized conductor, the density of surface charge is larger, and the electric field intensity of generation is also stronger, must relatively improve electric field intensity.Using relatively fixedly under the output power value condition, improved the TURP effect.

Description of drawings

Fig. 1 is traditional electrical writing of indictments, appeals, etc. electrode cross-section schematic diagram;

Fig. 2 is pencil electrode cross-section schematic diagram of the present invention.

Blade before 1 electrode cross-section 3 cylinders

The 2 front blades of rear blade 4

The specific embodiment

For making the purpose, technical solutions and advantages of the present invention clearer, below in conjunction with specific embodiments and the drawings, the present invention is described in more detail.

Fig. 1 is traditional electrical writing of indictments, appeals, etc. electrode cross-section schematic diagram; As shown in the figure, the front and back blade of traditional electrode cross section is cylinder, and its length-width ratio is 2.35:0.5; The front blade 3 of cylinder and rear blade can think that a radius is the cylinder of 0.25 equivalent circular.

Fig. 2 is pencil electrode cross-section schematic diagram of the present invention.The change part of the technical program is one of them blade, namely before blade 4 change the front blade of real knife-edge into.Even its sharp journey in cold situation, also can utilize its blade to carry out fraction ground cutting and separate.So sharp front blade 4 is arranged, after energising, under the action effect of high frequency electric, can more effectively cut.Therefore, this product can reduce the output of electric knife under the condition that guarantees equal cutting effect.Cause the pair damage that heat effect is brought greatly to reduce, improved rear effect.

Why produce above effect, its reason is to have certain relation due to the density of surface charge on energized conductor and surface configuration, that is, and and the physical phenomenon of well-known point discharge.When in energized conductor, electric charge accumulation being arranged, charge density σ is relevant with the shape of conductive surface, approach zero in recessed position charge density, little in mild position charge density, maximum in the outstanding position charge density of point, the electric field of charge generation can be very large, after charge density σ reached certain value, electric field can be air ionization, airborne and the charged opposite ion of conductor can with the charging neutrality of conductor, discharge spark occurs, produce airborne point discharge phenomenon.

Help to understand this surperficial charge density of bandy surface more crooked (that is corresponding radius of curvature is less) with a simple calculating larger:

Radius is respectively R is connected with a wire with two Metal Ball of size of r, so two ball equipotentials; If the quantity of electric charge on two ball surfaces is respectively that Q and q, charge density σ are respectively σ A and σ a.For the conducting sphere of uniform charged, its electromotive force formula can obtain a simple form by the definition of Gauss theorem and electric potential energy and electromotive force, the integral and calculating of merit:

Large ball is had: electromotive force U=kQ/R, charge density σ A=Q/ (4 π RR)

Bead is had: electromotive force u=kq/r, charge density σ a=q/ (4 π rr)

U=u; So, k (4 π RR) σ A/R=k (4 π rr) σ a/r

That is: σ AR=σ ar that is to say: ball is less, its curvature larger (also claiming that radius of curvature is less), and its surface density of charge σ is larger.

Define according to Gauss theorem Gauss Law: the electric flux by any closed surface equals the algebraical sum of all quantities of electric charge that this closed surface surrounds and the ratio of electric constant.

Its integral expression is:

Its differential form is:

$\▿.E=4\mathrm{\π\σ}$ (

Be divergence operator)

Get enough little bin Δ S arbitrarily on the energized conductor surface, evenly distribute down to the electric charge with density of surface charge σ on Δ S.Surround Δ S and do cylindric closed cylinder.Make that on it, area of bottom surface is equal to Δ S, and parallel with conductive surface.Upper bottom surface is in the conductor outside, and bottom surface is inner at conductor.Obviously, cylindrical side is parallel with direction of an electric field, and its flux is zero.The conductor internal electric field is zero, and the electric flux of bottom surface is zero.So the electric flux by the face of cylinder just equals the electric flux by upper bottom surface.According to Gauss theorem

Namely have: E Δ S=Q/ ε=σ Δ S/ ε can solve: E=σ/ε, this formula is interpreted as: the size of the electric field strength E of energized conductor near surface is directly proportional to the density of surface charge σ of this place.Meet in classical field theory, electric field is the theory of active.

According to aforementioned conclusion, can obtain following inference:

The sharper place of shape on energized conductor, the density of surface charge is larger, and the electric field intensity of generation is also stronger.

Therefore, change consciously the geometry of electrode, must relatively improve electric field intensity.Using relatively fixedly under the output power value condition, improved the TURP effect.

Evidence: after we changed the equivalent circular cylinder blade that was originally the 0.25mm radius into blade that angle is the 55-65 degree, bus is long shortened 10%.Contact area is corresponding reduces 10%.Texts uses performance number to descend 10%.If angle is less than 55 degree, the cold cut effect is no doubt fine, but easily bears damage because maloperation causes when reality is used, and therefore, best angle is 60 degree.During use, under the condition of same effect, corresponding output depending on cut tissue, as periosteum soft tissue fatty blood vessel skin etc., the scope of minimizing is at 10%--30%.

Above-described specific embodiment; purpose of the present invention, technical scheme and beneficial effect have been carried out further detailed description; institute is understood that; the above is only specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any modification of making, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.

Claims (3)

1. a pencil electrode, is characterized in that, the front blade of the front blade of described electrode 4 for having knife-edge, its front blade (4) though sharpness in cold situation, utilize its blade also can carry out fraction ground and cut and separate.

2. pencil electrode according to claim 1, is characterized in that, the angle of described front blade (4) is the 55-65 degree.

3. pencil electrode according to claim 2, is characterized in that, the angle of described front blade (4) is 60 degree.

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