WO2013117509A2

WO2013117509A2 - Sonotrode for introducing ultrasonic energy

Info

Publication number: WO2013117509A2
Application number: PCT/EP2013/052118
Authority: WO
Inventors: Dominik Eggert; Falko Schlottig; Marco Stoffel; Uwe Werner
Original assignee: Nexilis Ag C/O Bdo Ag
Priority date: 2012-02-10
Filing date: 2013-02-04
Publication date: 2013-08-15
Also published as: WO2013117509A3

Abstract

The invention relates to a sonotrode (18) for connecting to an ultrasonic vibration transducer (2, 3) having a connection section (4), which extends along a first axis (17) and is fastened or connected to the vibration transducer (2, 3) by means of a first end (21), the connection section (4) being made to vibrate almost exclusively along the first axis (17) by the ultrasonic vibration transducer (2, 3), in particular for use in the medical technology field. The sonotrode is characterized in that, at the distal end of the connection section (4), a transverse element (6) extending along a second axis (20) is arranged in the vicinity of the proximal end (23) of the transverse element, and a sleeve (5) extending along a third axis (8) for introducing ultrasonic vibrations into a processing area is arranged on said transverse element (6) at an offset along the second axis (2). The second axis (20) is arranged substantially perpendicular to the first axis (17), the third axis (8) is arranged substantially perpendicular to the second axis (20) and substantially parallel to the first axis (17), and the sleeve (5) extends to the side of the transverse element (6) opposite the connection section (4). The proximal junction point (14) is now offset from the proximal end (23) of the transverse element (6) such as to form a proximal projection (25), the proximal junction point (14) is offset from the distal junction point by a distance (d₂), the distal junction point (15) is offset from the distal end (24) by a distance (d₃) such as to form a distal projection (26), the total length of the transverse element (6) corresponds to an integer multiple of half the wavelength (λ/2) of an axial ultrasonic natural vibration of the transverse element (6) and/or an integer multiple of half the wavelength (λ/2) of an ultrasonic bending natural vibration of the transverse element (6), and the third distance (d₃) corresponds to an integer multiple of half the wavelength (λ/2) of the axial ultrasonic natural vibration or a quarter of the wavelength (λ/4) of the ultrasonic bending natural vibration.

Description

TITLE

Sonotrode for the introduction of ultrasound energy

TECHNICAL AREA

The present invention relates to sonotrodes for the introduction of ultrasonic energy in particular in porous recesses, sonotrodes tools with such sonotrodes and uses of such devices.

STATE OF THE ART

Ultrasound is increasingly being used to produce connections between workpieces by introducing material liquefying under the influence of ultrasound into a connection point, liquefying it under ultrasound, and then establishing a positive and / or material connection between two workpieces.

In order for the liquefaction to be as efficient as possible, i. using as little vibration energy as possible and localized as possible, it is necessary to provide devices which make it possible to introduce the ultrasonic vibrations with an optimum orientation of the ultrasonic vibration for the corresponding application. In addition, it is important to meet the often difficult space conditions at the point of introduction by a deflection of the vibrations is realized.

Accordingly, there are, from the medical as well as the non-medical field, a variety of special devices, so-called sonotrode tools that allow the introduction of ultrasound.

It is, as for example from US 5,100,321, US 2003/0157458, EP 0 535 542 or US 5,899,693 respectively. EP 1 530 953, a deflection of the ultrasound in the field of application, as far as can be said in these cases at all by an actual targeted diversion of ultrasound ensured by a sonotrode is coupled to a device generating the ultrasound, which has a hook-like shape, with which then adapted to the tight space conditions, specifically the vibration energy can be carried over the top of this hook-like device to the desired location. The problem with such devices is that the deflection of ultrasonic vibrations is a complex matter, and Accordingly, such devices, for example, if an ultrasonic vibration is applied in the axial direction, for example, at the coupling point, not ensure that abuts also at the projecting at an angle to this coupling point tip of the sonotrode also extending only along the axis of the tip ultrasonic vibration. Thus, lateral vibrations, which in turn, for example, especially in the medical field, are extremely undesirable, because they can lead to unpleasant pain when working on the patient, but also because they can possibly permanently damage the surrounding tissue at the top. In addition, this results in an inefficient energy input and thus an undesirable extension of the treatment time.

On the other hand, there are devices that are specifically designed to divert ultrasonic vibrations. This is then done via bending vibrations of correspondingly trained sonotrodes, in other words, an axial vibration, which is applied to the foot or along the mounting axis of the sonotrode, converted into a bending vibration in a normally specifically curved for this purpose intermediate element of the sonotrode, and then on Transposed end of the sonotrode this one bending vibration exporting coupling element in a tip, which is geometrically arranged so that at the tip targeted an axial ultrasonic vibration in this tip element. Devices of this type, which then usually have ring-shaped or circular intermediate elements which take over the flexural vibration, are known, for example, from EP 0 594 541, WO 2005/009256, US 2010/0130867, or from DE 20113692.

Such devices have the disadvantage that the curved, the bending vibration passing intermediate elements are complex, and in particular heavily loaded elements are also susceptible to wear, and also need a lot of space. A construction based on the same principle is known from WO 2007/101362, but here no really ring-shaped intermediate bending vibration element is used, but only a curved bending vibration element designed in the form of a pitch circle.

From DE 10 2007 016353 describes a coupling unit for transmitting high-frequency mechanical vibrations from a vibration generator to a tool. This comprises an input part and an output part, which are connected to each other via two equal mutually offset vibrating beams. These can be the Have a shape of quarter-circle to provide the output movement in a direction which encloses with the direction of the input movement of an angle of 90 degrees. The vibrating beam is deliberately placed in a pure tilting movement, which then also leads to a rocking vibration at the output part, respectively to bending vibrations in this.

PRESENTATION OF THE INVENTION

It is accordingly an object of the present invention to propose an improved sonotrode, in particular one which is able to specifically redirect a deflection of oscillating oscillations along only one axis in a small space by a certain angle, i. so that in turn oscillating ultrasonic vibrations result essentially along this second axis along the second axis only.

Specifically, it is about to propose a sonotrode for connection to an ultrasonic vibrator with a along a first axis extending terminal portion which is attached to a first end of the vibrator or connected thereto, wherein the connecting portion by the ultrasonic vibrator substantially exclusively is placed in a vibration along the first axis.

The object is achieved by the features of claim 1.

In particular, a sonotrode, as proposed herein, is provided for connection to an ultrasonic vibration generator. The sonotrode has a connection section extending along a first axis, which is attached to or connected to a first end of the vibration transmitter. The connection section is offset by the ultrasonic vibration generator substantially exclusively in a vibration along the first axis. But it is also possible that this connection section is not part of the sonotrode, that is, the component to deflection, but part of the vibration generator.

Such a sonotrode is now particularly preferably characterized in that a transverse element extending along a second axis is arranged in the region of its proximal end at the distal end of the connection section opposite the first end at a proximal attachment point. This, preferably designed as a single cross bar, cross member is intended, as a result of selected geometry, etc, selectively absorb the vibration energy so that it is transmitted to the cuff described below so that in turn only one vibration along the axis of this cuff is present in the cuff, ie that the cuff substantially free of bending vibrations is stimulated and does not perform any weighing or tilting movements. The actual ultrasonic vibration in this cross element is very difficult to predict and measure. Without being bound by the scientific explanation that has now been given, it seems as if such an optimal transfer occurs on the basis of two mechanisms, the two mechanisms depending on the geometric interpretation may occur alone or in combination.

A first mechanism seems to be that the transverse element is displaced substantially only by the vibrator into a longitudinal ultrasonic vibration (longitudinal vibration at a natural frequency of the transverse element), i. additional bending vibrations are preferably substantially completely avoided. In this case, the longitudinal ultrasonic vibration in the transverse element seems to be transferred to the cuff to a certain extent in a node of the longitudinal vibration, that is to say the cuff and the proximal attachment point are to be arranged at such a node.

A second mechanism seems to be that the transverse element is placed in a bending vibration, the end points of the transverse element forming nodes or maxima / minima and the location of the coupling at the point of attachment at a first maximum of the oscillation amplitude is arranged and the attachment point of the cuff at a second maximum (in absolute terms, ie it can also be a minimum) is connected.

Common to both mechanisms is that the proximal attachment point of the excitation and the distal attachment point of the cuff are arranged offset from one another by an integer fraction of the wavelength of the respective natural vibration in the transverse element from the end points. In the case of longitudinal vibrations, this offset is in each case a multiple of λ / 2, in the case of bending vibrations a multiple of λ / 4.

At this transverse element, offset in the region of the distal end, along the second axis to the proximal connection point of the connection portion, at a distal Connection point arranged along a third axis extending collar for entering ultrasonic vibrations in a processing area. In other words, results in a somewhat step-like construction, the cuff is in particular also only in longitudinal ultrasonic vibrations, that is bending vibrations should, in particular with regard to the specific method mentioned below, account for the smallest possible proportion. The proportion of vibrations that are non-axial (ie, flexural vibrations in the cuff) should preferably be no more than 20%, preferably not more than 15%, and more preferably no more than 10% or 5% of the total ultrasonic vibratory energy. That is, the majority of the vibrational energy, ie more than 80%, preferably more than 85%, more preferably more than 90% -95% and most preferably at least 98% of the ultrasonic energy in the cuff, in particular at the top of the cuff, in the case a hollow cylindrical configuration of the same at the peripheral edge, ie at the tip of the respective sleeve in the region of the front opening, abuts as an axial vibration.

In order to ensure this oscillation behavior, the second axis is arranged substantially perpendicular to the first axis, and the third axis is arranged substantially perpendicular to the second axis and preferably at the same time also substantially parallel to the first axis. This means that typically connecting portion, cross member and sleeve lie in a plane. In this case, the collar extends to the side of the transverse element opposite the connection section, that is to say from the transverse element the connection section branches off in the region of the proximal end to one side and the collar in the region of the distal end to the opposite side.

According to the invention is the proximal point of attachment of the proximal end of the cross member preferably masses added to form a proximal supernatant by a first distance d _\. In any event, the proximal attachment point is offset from the distal attachment point by a second distance d ₂ , and the distal attachment point is offset from the distal end by a third distance d ₃ to form a distal protrusion. In this case, the total length of the transverse element corresponds to an integral multiple of half the wavelength λ / 2 of an axial ultrasound (intrinsic) oscillation of the transverse element and the third distance d _{3 to} an integer multiple of this half wavelength λ / 2. So couples the longitudinal Ultrasonic vibration in the cross element to some extent in a node of vibration on the cuff over. If the device is specifically designed so that the above-mentioned bending vibrations are present, then the total length of the transverse element corresponds to an integer or half-integer multiple of the wavelength of an ultrasonic bending vibration of the transverse element and the third distance d _{3 to} an integral multiple of the quarter wavelength λ / 4 , in particular an odd integer multiple of the quarter wavelength λ / 4. In this case, it is then not transmitted via a node of the bending vibration, but over the point of maximum deflection to the cuff. These two types of vibrations can be applied either alone or in combination. As a result, the vibration in the cuff is then optimally present as longitudinal vibration in the cuff.

Based on the overall length of the transverse element, according to a further preferred embodiment, the length of the section di and / or that of the section d ₃ is selected such that the total length of the transverse element is an integer multiple of the section. Or in other words, the length of the portion d] and / or that of the portion d ₃ is selected so that they 1/3, 1/4, 1/5, 1/6, 1/7, 1/8, 1 / 9, 1/10, ... the total length of the cross element. For example, if the length of the section d ₃ and that of the section d _{3 are} each 1/4 of the total length G of the transverse element, then the particular sections will be an integer multiple of a half natural oscillation wavelength, ie

G, d ₃ =% G and d ₂ = G. The length of the section d _\ and that of the section d ₃ can be chosen the same, but they can also assume different values.

According to a first preferred embodiment, the first distance d _\ is also designed so that it an integer multiple of half the wavelength (λ / 2), in the case of longitudinal vibrations, respectively, an integer multiple of the quarter wavelength (λ / 4) in the case of bending vibrations, corresponds, preferably half a wavelength in the case of the longitudinal vibrations and a quarter wavelength in the case of bending vibrations. This means that there is a protrusion on the proximal side as well as on the distal side in this design. So is the coupling at a node (longitudinal vibrations) or point maximum deflection (bending vibrations) and correspondingly optimally efficient.

A further preferred embodiment is characterized in that the second Distance d ₂ corresponds to an integer multiple of half the wavelength λ / 2, preferably twice, three times, or four times the half wavelength λ / 2.

The sleeve and / or the cross member may be formed as a circular cylinder with a circular cylindrical outer surface.

Preferably, the sleeve has a central axial cylindrical recess which is open to the free end to form a front opening. The recess may be a through hole with a constant inner diameter, which is preferably additionally accessible at the location of the crossing region between the cross member and sleeves via a rear opening. The through hole may, where it passes through the cross member, also specifically have a smaller diameter than in the region of the sleeve. Such a configuration has the advantage that a guide pin which is inserted into the sleeve (see description of the method below), can only be inserted up to a stop position, but that the guide pin then also by introducing, for example, an auxiliary pin through the back In this way, the smaller diameter opening through the cross member can be ejected from the collars. It may also be advantageous if the through-bore has a larger diameter in the rear, that is preferably in the transverse element facing and through this normally passing region than in the region of the distal opening of the sleeve. In this case, a guide pin can be used with a correspondingly stepped diameter, which is adapted to this stepped opening. This ensures that the guide pin, when the sleeves are pulled out of the machining opening again, does not get stuck in the machining opening, but can be safely pulled out again.

A further particularly preferred embodiment is thus characterized in that the sleeve has a central axial cylindrical recess which is open to the free end to form a front opening. In other words, the sleeve is designed as a hollow cylinder, but it can also be designed as a solid cylinder. For example, such a sonotrode can be used in a method as described in WO 2009/141252. If the collar is formed as a solid cylinder, it takes over the function of the guide pin in the method according to WO 2009/141252, the sleeve is formed as a hollow cylinder, and this is the preferred variant, it is used as a cuff in the sense of the method according to WO 2009/141252. If a hollow cylinder is formed, then the cylindrical interior formed therewith preferably has a constant cross-sectional area over the length. The peripheral edge of the sleeve formed in the region of the front opening is preferably formed tapered, as is apparent from the above-mentioned international publication and the method described therein, in order to ensure an optimal lateral displacement of the liquefiable material in the porous wall structure of the recess ,

A further preferred embodiment of the proposed sonotrode is characterized in that both the connection region and the sleeve, and preferably also the transverse element, are designed as tubular hollow cylinders which converge at respective points of intersection at the points of contact or are connected to one another, preferably through the sleeve accessible from both sides through hole is present.

The connecting portion, the cross member and the collar are normally, as already explained above, arranged in a common plane, and in the cross member are excited when excited via the connecting portion substantially exclusively along the second axis extending longitudinal vibrations, and in the cuff substantially longitudinal oscillations extending exclusively along the third axis, whereby material thickenings and / or material recesses are preferably formed at the attachment points in order to ensure this oscillation behavior at the sonotrode, in particular in the respective crossing regions.

Such a sonotrode is preferably made of a metallic material, preferably selected from the group consisting of: aluminum, iron, titanium, steel and these mainly containing or consisting of these alloys, preferably the sonotrode is formed integrally and machined from a single block of work or preferably wherein the sonotrode is formed from elements screwed or shrunk into one another by screwing together the connection section and / or the crossing regions and / or the sleeve.

With regard to dimensioning it has, in particular for the amelioration of bores, for example in the furniture sector, or generally in the connection of porous materials such as wood, foams (metal foams, plastic foams, etc.), Composite materials, or in the medical field, for example, when drilling in bone or porous tissue, proved to be advantageous if the cuff has certain dimensions. Depending on the field of application, the sleeve may have a length in the range of 5-50 mm, preferably in the range of 10-25 mm, and a diameter in the range of 2-15 mm, preferably in the range of 2.5-10 mm, in particular preferably in Range of 2.5-7 mm.

At the first end of the connection section may further be provided an interface for attachment to the ultrasonic vibrator, preferably in the form of a positive and / or non-positive coupling region, particularly preferably in the form of a thread, a flange, a groove or a bayonet closure.

Preferably, the sonotrode is free of welds, as they can adversely affect the vibration behavior. As explained, coatings can be used, in particular coatings which are e.g. the sliding properties, the hygiene properties, and / or the vibration transmission properties influence. Possible, for example, especially in the field of cuffs, coatings made of plastic such as PTFE.

Furthermore, the present invention relates to a sonotrode tool with an ultrasonic vibrator and a sonotrode as described above, wherein preferably the vibration generator comprises a trained as a handle converter and a booster, wherein the sonotrode is attached to the booster or formed integrally therewith. Such a tool may preferably be characterized in that it is designed as a hand tool for the medical field, in particular for the implant area, in particular for the dental area. A corresponding tool typically also has an electrical connection and a controller with which the applied vibration can be adjusted. Usually, vibrations are applied in the range of 20-120 kHz, preferably in the range of 30-80 kHz, more preferably in the range of 50-80 kHz.

Furthermore, the present invention relates to the use of such a sonotrode or sonotrode tool for amelioration of a recess, namely in the context of a method, as described in detail in WO 2009/141252, for example. It may be a medical procedure or a non-medical procedure. With regard to the procedure, the The disclosure content of WO 2009/141252 is expressly included in this disclosure content. Thus, the present invention also relates to the use of a sonotrode as described above or a sonotrode tool as described above for amelioration of a recess (entirely in the sense of the above-mentioned WO 2009/141252 and the method described therein), in particular a recess in a porous, holey and through the recess exposed voids having material. In this use, the cylindrical cuff is used with a cylindrical outer surface with an outer diameter and a central recess for receiving a guide pin, wherein the guide pin is intended to be introduced before the application of mechanical energy substantially to the bottom of the recess the guide pin is enclosed in the region of its end facing the bottom of the recess by an amelioration sleeve of a material which can be liquefied with mechanical energy, the cylindrical outer surface of the amelioration sleeve having substantially the same outside diameter as the sleeve, and the guide pin being displaceable in the central recess is added that the cuff upon application of mechanical energy relative to the guide pin towards the bottom of the recess with liquefaction and lateral and / or longitudinal displacement of the material of Amelio rationshülse can be moved.

Further embodiments are given in the dependent claims.

BRIEF DESCRIPTION OF THE DRAWINGS

Preferred embodiments of the invention will be described below with reference to the drawings, which are given by way of illustration only and are not to be construed as limiting. In the drawings show:

1 is a side view of a sonotrode tool, in which the

Sonotrode lies in the plane of the paper, and where n = 4;

Fig. 2 is a side view of a sonotrode tool, in which the

Sonotrode lies in the plane of the paper, and where n = 5;

Fig. 3 is a side view of a sonotrode tool, in which the

Sonotrode lies in the plane of the paper, where n = 4, and wherein the guide pin protrudes from the front of the sleeve; and

Fig. 4 in a side view of a sonotrode tool, in which the Sonotrode lies in the plane of the paper, where n = 5, and wherein the guide pin protrudes from the front of the sleeve and rear of the cross member. DESCRIPTION OF PREFERRED EMBODIMENTS

In particular for the medical field, namely for the implant area and in particular for the dental implant area, a method for ameliorating recesses in porous materials is known, for example, from WO 2009/141252. In this case, a substantially cylindrical sleeve made of a material which liquefies under ultrasound is used, as it were, to fill the porosity of the wall regions of the recess with this material in a liquefying manner under the action of ultrasound. This is done so that a guide pin, which is guided in a provided with a corresponding axial recess cuff, is inserted into an already provided hole as a guide element, and then the sliding mounted thereon cuff is pushed down in the direction of the bottom of the recess. Around the guide pin, a hollow cylinder made of a liquefiable material is provided in the tip region, and this is outwardly through the sleeve, which has an outer circumference, which corresponds substantially to the inner diameter of the bore to be ameliorated by the downwardly displacing and simultaneous liquefaction of this material sleeve displaced into the porosity and filled accordingly cavities in the material.

In connection with such a method, it is advantageous if only on the sleeve, which is guided over the guide pin, an ultrasonic vibration is present, so that in some sense the material to be liquefied always only where it is in contact with this sleeve, is liquefied , In addition, lateral ultrasonic vibrations should be avoided on this cuff, i. The ultrasonic vibrations should run as so-called longitudinal vibrations along the axis of this cuff. Since in the dental field, the space is cramped, there is accordingly a need for devices which are capable of deflecting the ultrasonic vibration of a handset in one direction, so that it can then be optimally used in a machining a hole. Such a device will be described below.

FIG. 1 shows a sonotrode tool 1 in a lateral representation. The converter 2, which is usually formed simultaneously as a handle for such a tool is not shown, but only indicated schematically. The converter is used to generate along the course axis of the converter resp. following booster 3 extending ultrasonic vibrations, as indicated schematically by the arrow 9. The booster 3 typically has at its end a coupling point for fastening a connection section 4 of the actual sonotrode 18 described below. This interface can, as already stated above, be formed as a thread or the like, whereby care must be taken with these fastening mechanisms in that the transmission of the ultrasound is not impaired or as little as possible by the mechanism used.

Thus, with its proximal end 23, the connection section 4 adjoins the booster with the connection end 21. With the distal end 22 follows on the connection section 4, a rod-shaped cross member 6, which is along a direction perpendicular to the axis 17 of the converter 2, respectively. the vibration course 9 extending axis 20 extends. At a certain extent other end of this cross member 6, on the connection portion 4 opposite side thereof, a sleeve 5 is arranged, which is also formed rod-shaped.

However, the transverse element 6 is not connected to the connection section 4 at its outermost proximal end 23, but instead is somewhat offset therefrom, specifically at a proximal connection point 15, so that a proximal projection 25 is formed.

Similarly, on the distal side, the cuff 5 is also arranged slightly offset inwardly from the distal end 24, so that a distal projection 26 is formed.

Connection section 4 and sleeve 5 extend with their axes 17 respectively. 8 substantially parallel to each other, and the three axes 17, 20 and 8 are arranged substantially in a plane. The offset of connecting portion 4 and sleeve 5 along the direction of the cross member, shown in the figure with d ₂ , is essential.

In order to ensure for the first case of the appropriate vibrations that in the transverse element 6 exclusively in the longitudinal direction, ie along the axis 20 extending ultrasonic vibration is applied, and corresponding bending vibrations, respectively. Pendulum vibrations can be largely excluded, the sizing is typically made so that the offset between the proximal end 23 and proximal attachment point 14, in the figure represented as di, is a multiple of half the wavelength λ / 2 of a characteristic ultrasonic vibration in the cross member 6 along the axis 20. But the same device also works for the second case of the appropriate vibrations, that is, for the bending vibration in which case the entire length of the transverse element 6 constitutes exactly one integer or half-integer wavelength of the corresponding fundamental natural vibration, and the offset between the proximal end 23 and Proximal Anlmüpfungspunkt 14, which is shown in the figure as di, is then an integer odd multiple of the quarter wavelength λ / 4.

Similarly, the offset of distal end 24 to distal cuff attachment point 15 is selected at a distance d ₃ which is again an integer multiple of one half of that characteristic wavelength λ / 2 for the case of exclusive longitudinal vibration in the cross element and λ / 4 for the case of FIG suitable bending vibration in the transverse element, respectively odd multiples thereof, corresponds. Also, the offset d ₂ is selected as an integer multiple of this half wavelength λ / 2. In other words, the masses d _ls d ₂ and d _{3 are} all selected as integer multiples of the size λ / 2 and λ / 4, respectively, where d _{2 is} always λ / 2. This means that in the case of longitudinal vibrations, the longitudinal oscillation 9 is to a certain extent registered optimally at a node point in the transverse element 6 and is optimally converted into a longitudinal oscillation, as represented schematically by the arrow 10. Equally, however, this also means that the distal connection point 15 is also arranged at such a node and accordingly also an optimal conversion resp. Transmission of the ultrasonic vibration in the sleeve 5 is carried out, so that the ultrasonic vibration in this sleeve 5 then again only axially, ie along the axis 8 or as shown schematically by the arrow 11. In the case of bending vibrations, the two connection points 14 and 15 lie exactly on the maxima or minima of the corresponding natural vibration.

Depending on the room requirements and the desired vibration behavior, it is of course also possible to dimension such a sonotrode differently, subject to the observance of the integer multiples of the size λ / 2 or λ / 4. Thus, FIG. 1 shows a schematic representation of a situation in which di and d ₃ correspond exactly to λ / 2 for the longitudinal oscillations, and d ₂ corresponds to λ. Related to the Bending vibrations, optionally specific can be excited, the total length of the cross member in such a case is equal to the wavelength.

As an alternative, it is possible for the case of longitudinal vibrations but also for the bending vibrations, as shown in Figure 2, the offset d ₂ as 1.5 times the size λ / 2 to design. Even larger multiples are possible, namely a fourfold or fivefold of the size λ / 2. Relevant is usually the wavelength λ of a corresponding natural vibration, as it rests in the rod, this is calculated, based on the total length of the transverse element 6 (ie, d + d ₂ plus d ₃ ) also as an integer multiple of λ / 2. There are different such fundamental vibrations of such a cross element, these can be easily calculated as integer parts of the total length.

In particular, for carrying out a method, as it is known from WO 2009/141252, it may be advantageous if the sleeve 5 is formed as a hollow cylinder. This situation is illustrated schematically in FIGS. 3 and 4, each having a geometry analogous to FIG. 1 in FIG. 3 and analogous to FIG. 2 in FIG. 4. In FIG. 3, the sleeve 5 is designed as a hollow cylinder which has a cylindrical recess 27 and is formed open only at the distal end. At the thereby forming circumferential tip a tapered, stepped or straight, edge 19 is arranged to ensure optimum lateral displacement of liquefiable material. In the exception 27, a guide pin 7, for implementing a method according to WO 2009/141252, can now be inserted and used as a guide element in the amelioration process.

In Figure 4, the recess 27 is now also pulled through the cross member 6, i. through the cross member 6 a Durchfuhrungsausnehmung 16 is provided so that the guide pin 7 is inserted from the rear into the recess 27, respectively. can be pulled out of this.

LIST OF REFERENCE NUMBERS

1 sonotrode tool first working section 2 converter 18, cuff

3 booster cross element,

Connecting section of 18 longitudinal oscillators Guide pin 17 first axis,

Axis of 5 oscillation axis of 2/3/4

Vibration direction in 3 18 sonotrode

Vibration direction in 6 19 distal edge of 5

Direction of vibration at 5 20 second axis,

proximal supernatant of 6 axis of oscillation of 6 distal projection of 6 21 terminal end of 4 proximal 22 distal end of 4

Point of attachment, 23 proximal end of 6

Junction of the 24 distal end of 6

Longitudinal oscillation in 6 25 proximal supernatant distal attachment point, 26 distal supernatant

Junction of the 27 cylindrical recess in

Longitudinal vibration in 6 5

feed-through

in 6 for 7

Claims

A sonotrode (18) for connection to an ultrasonic vibration transmitter (2, 3) with a connecting section (4) extending along a first axis (17) and attached to the vibration transmitter (2, 3) by a first end (21) or is connected thereto, wherein the connection section (4) is offset by the ultrasonic vibration transmitter (2, 3) substantially exclusively in a vibration along the first axis (17),

characterized in that

a transverse element (6) extending along a second axis (20) is arranged in the region of its proximal end (23) at the distal end (43) of the connection section (4) opposite the first end (21) at a proximal connection point (14) , and

offset at this transverse element (6), in the region of its distal end (24), along the second axis (2) to the proximal attachment point (14) of the connection section (4), at a distal attachment point (15) along a third axis (15). 8) extending collar (5) for introducing ultrasonic vibrations is arranged in a processing area, wherein the second axis (20) is arranged substantially perpendicular to the first axis (17),

wherein the third axis (8) is arranged substantially perpendicular to the second axis (20) and substantially parallel to the first axis (17),

wherein the sleeve (5) extends on the side of the transverse element (6) opposite the connection section (4) or on the side of the connection section (4),

wherein the proximal point of attachment (14) from the proximal end (23) of the transverse element (6) to form a proximal projection (25) by a first distance

the distal attachment point (14) is offset from the distal attachment point by a second distance (d ₂ ), and the distal attachment point (15) is formed to form a distal protrusion (26) from the distal end (24) a third distance (i.e. ₃ ) is offset, and

wherein the total length of the cross member (6) is an integral multiple of half the wavelength (λ / 2) of an axial ultrasonic vibration of the Transverse element (6) and / or an integral multiple of half the wavelength (λ / 2) corresponds to an ultrasonic bending inherent vibration of the transverse element (6) and the third distance (d ₃ ) an integer multiple of this half wavelength (λ / 2) of the axial Ultraschallalleigenschwingung respectively corresponds to a quarter wavelength (λ / 4) of the ultrasonic bending natural vibration.

2. sonotrode (18) according to claim 1, characterized in that the first distance

(di) corresponds to an integer multiple of half the wavelength (λ / 2) of the axial Ultraschallalleigenschwingung, preferably one half of such wavelength, or a quarter wavelength (λ / 4) of the ultrasonic bending inherent vibration.

3. sonotrode (18) according to claim 1 or 2, characterized in that the second

Distance (d ₂ ) corresponds to an integer multiple of half the wavelength (λ / 2) of the axial ultrasonic natural vibration or the ultrasonic bending natural vibration, preferably twice, three times, or four times the half wavelength (λ / 2).

4. sonotrode (18) according to any one of the preceding claims, characterized in that the sleeve (5) and / or the transverse element (6) are designed as a circular cylinder with a circular cylindrical outer surface.

5. sonotrode (18) according to any one of the preceding claims, characterized in that the sleeve (5) has a central axial cylindrical recess (27) which is open to the free end to form a front opening, wherein preferably the recess (27) is a through hole with a constant inner diameter, which is preferably additionally accessible at the location of the crossing region between the transverse element (6) and sleeves (5) via a rear opening (16).

6. sonotrode (18) according to claim 5, characterized in that the formed in the region of the front opening peripheral edge (19) of the sleeve (5) is tapered.

7. sonotrode (18) according to any one of the preceding claims, characterized in that both connection region (4) and the sleeve (5), and preferably also the transverse element (6) are formed as tubular hollow cylinder, which in respective crossing regions in the Connecting points (14, 15) converge or are connected to each other, preferably by a through-opening (27) accessible from both sides through the sleeve (5) is present.

8. sonotrode (18) according to any one of the preceding claims, characterized in that the connecting portion (4), the transverse element (6) and the sleeve (5) are arranged in a common plane, and in the transverse element (6) when excited by the Connecting portion (4) substantially exclusively along the second axis (20) extending longitudinal vibrations

(10) are excited, and in the cuffs (5) substantially only along the third axis (8) extending longitudinal vibrations

(11), wherein to ensure this vibration behavior on the sonotrode (18) in particular in the respective crossing regions at the attachment points (14,15) are preferably formed material thickening and / or material recesses.

9. sonotrode (18) according to any one of the preceding claims, characterized in that it consists of a metallic material, preferably selected from the group consisting of: aluminum, iron, titanium, steel and these mainly containing or consisting of these alloys, wherein preferably the sonotrode is formed in one piece and machined from a single block of work, or preferably wherein the sonotrode is formed from one another by screwing together the connecting section (4) and / or the crossing regions (14, 15) and / or the sleeve (5) be bolted together.

10. sonotrode (18) according to any one of the preceding claims, characterized in that the sleeve (5) has a length in the range of 5-50 mm, preferably in the range of 10-25 mm and a diameter in the range of 2-15 mm , preferably in the range of 2.5-10 mm, in particular preferably in the range of 2.5-7 mm.

11. sonotrode (18) according to any one of the preceding claims, characterized in that at the first end (21) of the connection portion (4) an interface for attachment to the ultrasonic vibration transmitter (2, 3) is provided, preferably in the form of a positive and / or non-positive coupling region, particularly preferably in the form of a thread, one Flange, a groove or a bayonet closure.

12. sonotrode tool (1) with an ultrasonic vibration transmitter (2, 3) and a sonotrode (18) according to one of the preceding claims, wherein preferably the vibration sensor comprises a handle formed as a converter (2) and a booster (3), wherein the Sonotrode is attached to the booster or is formed integrally with this.

13. sonotrode tool (1) according to claim 12, characterized in that it is designed as a hand tool for the medical field, in particular for the implant area, in particular for the dental area.

14. Use of a sonotrode (18) according to any one of the preceding claims 1- 11 or a sonotrode tool according to claim 12 or 13 for amelioration of a recess, in particular a recess in a porous, holey and exposed through the recess cavities material, wherein the cylindrical sleeve (5) having a cylindrical outer surface with an outer diameter and a central recess (27) for receiving a guide pin (7) is inserted, wherein the guide pin (7) is provided, prior to the application of mechanical energy substantially to the ground the guide pin (7) is enclosed in the region of its end facing the bottom of the recess by an amelioration sleeve of a material which can be liquefied with mechanical energy, the cylindrical outer surface of the amelioration sleeve having substantially the same outside diameter as the sleeve ( 5) , and wherein the guide pin (7) in the central recess (27) is slidably received such that the sleeve (5) upon application of mechanical energy relative to the guide pin (7) toward the bottom of the recess under liquefaction and laterally and / or longitudinal displacement of the material of the amelioration sleeve can be moved.