DE102018200303A1 - Rolling bearings, in particular for a medical or cosmetic instrument - Google Patents

Abstract

The invention relates to a Wälzlager- with a bearing inner ring and a first bearing ring and a second bearing ring and a plurality of rolling on the first bearing ring and the second bearing ring rolling elements, which are positioned between the first bearing ring and the second bearing ring in a bearing gap; wherein at least one of the bearing rings is positioned circumferentially about an axis of rotation and a sealing disk is provided for sealing the bearing gap, which rotates about the axis of rotation with the encircling bearing ring and defines a sealing gap together with a mating surface. The rolling bearing according to the invention is characterized in that Sealing disc is made of an elastic material and / or is elastically mounted and extends in the direction of the counter surface, that in dependence on a speed of the sealing disc, the sealing disc and / or its storage is elastically deformed by centrifugal force and thereby the sealing gap is increased or decreased.

Description

The present invention relates to a rolling bearing, in particular for a medical or cosmetic instrument, such as hand instrument or minimally invasive surgical instrument, and a corresponding medical or cosmetic instrument with a rotating shaft with such a rolling bearing.

In rolling bearings is generally the risk that between the bearing outer ring and the bearing inner ring, in particular in the region of the raceways of the rolling elements penetrating dirt particles lead to premature wear, which reduces the life of the bearing. In rolling bearings in medical or cosmetic instruments there is also the danger that when a necessary disinfection of the instrument with a more or less aggressive disinfectant grease or lubricant is flushed out of the bearing, which also leads to increased wear and a reduced life of the bearing. It is therefore customary, at least in the case of the instruments, to seal or minimize the bearing gap between the bearing inner race and the bearing outer race in order to minimize the entry of foreign substances or undesired media.

In rolling bearings in dental hand instruments or in surgical instruments, as particularly relates to the present invention may also be desirable that in certain applications, body fluids such as saliva or blood to flow through the instrument and then disposed of properly. Again, a particle deposition in the bearing, which can lead to a blocking of the drive shaft, must be avoided. Furthermore, the above with respect to the penetration of disinfectants said. In such instruments, it is therefore advantageous if a seal is provided which seals the bearing gap with stationary, that is non-rotating rolling bearing or non-rotating bearing in the rolling bearing of the bearing and reveals the bearing gap more or less in rotating rolling bearing or rotating shaft ,

EP 0 689 801 A2 Accordingly, disclosed for a medical or dental treatment instrument with drive a bearing seal with straight sealing washers or angled labyrinth rings on the bearing outer ring and bearing inner ring, which seal the bearing gap largely by forming a labyrinth seal. Further, a slinger may be provided on the shaft carrying the tool upstream of the seal on the attack side of body fluids such as blood or saliva.

DE 10 2012 000 757 A1 discloses an elastically deformable sealing washer for sealing the bearing gap between the bearing outer ring and the bearing inner ring. The stationary in the bearing outer ring held sealing disc is lifted by a pressure difference with rotating bearing inner ring of a counter surface and lies down when the bearing inner ring as a result, the pressure difference drops away to the opposite surface. This achieves the above-described functionality of the contacting seal at standstill and the non-contacting seal in the operating state with a rotating shaft.

EP 0 497 139 B1 proposes to achieve the same functionality to provide in the handpiece head around the tool shank an elastic and resting on the tool shank all around and sealing it outward disc that lifts as far from the tool shank under the effect of forming in the handpiece head overpressure in the operation that no contact more occurs. When switching off the drive air and the resulting collapse of the overpressure in the handpiece head, the elastic disc rests again on the still rotating tool shank and thereby brakes it while at the same time the penetration of contaminants along the tool shank is prevented due to the forming negative pressure in the housing.

The rolling bearings mentioned have the disadvantage that they either do not allow the desired change in the sealing gap between the sealing disc and a counter surface depending on the operating state, in particular as a function of the rotational speed, or that a change in the size of the sealing gap caused by said pressure difference and thus is susceptible to failure in operation, if the necessary pressure difference can not be reliably maintained.

The present invention is therefore an object of the invention to provide a rolling bearing of the type shown, in which a change in the sealing gap between a sealing disc and a counter surface in dependence on the bearing speed is achieved and this sealing gap change is reliable and accurately repeatable. The rolling bearing should also advantageously have a particularly effective sealing of the bearing gap.

The object of the invention is achieved by a rolling bearing having the features of claim 1. In the dependent claims advantageous and particularly expedient embodiments of a rolling bearing according to the invention and a medical or cosmetic instrument, in particular hand instrument or surgical instrument, indicated with at least one rolling bearing according to the invention.

An inventive rolling bearing has a first bearing ring, in particular bearing inner ring, and a second bearing ring, in particular bearing outer ring, and a plurality of rolling on the first bearing ring and the second bearing ring rolling elements. The first bearing ring and the second bearing ring can each be made in one or more parts, so that the invention is not limited to rolling bearings with a single first bearing ring, in particular bearing inner ring, and / or a single second bearing ring, in particular bearing outer ring, but it can also be several first Bearing rings or bearing inner rings and / or second bearing rings or bearing outer rings may be provided.

The rolling elements are positioned between the bearing inner ring (or generally the first bearing ring) and the bearing outer ring (or generally the second bearing ring) in a bearing gap. The rolling bearing can be designed as a single-row roller bearing with a single row of rolling elements, which are positioned one behind the other in the circumferential direction of the rolling bearing, or as a multi-row roller bearing with a corresponding plurality of juxtaposed in the axial direction or radial direction of the rolling bearing rows of rolling elements. The rolling elements can be kept in a cage or rest against each other or to intermediate pieces. Other designs are possible.

At least one of the at least two bearing rings, that is, the first bearing ring / bearing inner ring and / or the second bearing ring / bearing outer ring, are circumferentially positioned about a rotation axis. For example, the second bearing ring / bearing outer ring is stationary and is held in particular in a stationary housing or formed by this and the first bearing ring / bearing inner ring runs around the axis of rotation.

Further, a sealing disc for sealing the bearing gap is provided, which rotates about the axis of rotation with the encircling bearing ring and defines a sealing gap together with a mating surface. This does not exclude that several sealing washers are provided. The at least one sealing disc, so that it rotates with the bearing ring, for example, the bearing inner ring, be attached directly to the corresponding bearing ring or be formed by this, that is, be integral with this, or only be mounted in such a way in the camp, for example on a in the bearing ring mounted shaft that it rotates together with the corresponding bearing ring. As a rule, the sealing disk will rotate at the same speed as the corresponding bearing ring. However, the invention is basically applicable to more complicated constructions in which the sealing disc rotates at a different speed than the bearing ring.

According to the invention the sealing disc is made of an elastic material and / or so elastically supported and extends in the direction of the counter surface, that in dependence of the speed of the sealing disc, the sealing disc and / or its storage is elastically deformed by a centrifugal force acting on the basis of the speed and thereby changing the sealing gap, that is, increased or decreased.

In contrast to the prior art with rolling bearings with elastically deformable seals initially described thus the deformation of the sealing disc or a displacement of the sealing disc is caused by deformation of the elastic bearing at least not only by a pressure difference across the sealing disc, but the deformation is particularly accurate repeatable by causes a centrifugal force acting on the sealing disc due to the rotation of the sealing disc. This does not exclude that in addition a pressure difference across the sealing disc is used to cause the desired deformation to change the sealing gap. In principle, however, such a pressure difference can be omitted.

Preferably, the sealing disc in an axial section through the rolling bearing on a curved, angled and / or uneven shape. This shaping causes a reliable desired change in the sealing gap as a result of the centrifugal force acting on the sealing disc. An uneven shape is understood, for example, to mean a shape in which the thickness of the sealing disk varies along a radial direction of extent of the sealing disk in the axial direction, in one embodiment with a radially extending sealing disk, such as a tilting moment or bending moment on the sealing disk by the centrifugal force , At least a predetermined portion thereof is effected to effect the desired change of the sealing gap as a function of the rotational speed.

According to one exemplary embodiment, it is provided that the sealing disc has a base body connected to or formed by the circumferential bearing ring and an angularly connected section which delimits the sealing gap with the mating surface, wherein the section extends in the direction of the axis of rotation and has a comparatively greater thickness and / or mass as a part of the sealing disc adjoining it in the direction of the main body.

The sealing disc is preferably at a speed below a predetermined limit speed, in particular at a standstill of the bearing, on the counter surface and is lifted when reaching the limit speed or at least at a speed above the limit speed by the centrifugal force of the counter surface.

For example, the sealing disc is mounted at least indirectly on the first bearing ring, in particular bearing inner ring, and / or in the first bearing ring, in particular bearing inner ring, mounted shaft or is formed integrally with this shaft or this bearing ring.

According to one embodiment of the invention, the mating surface is formed by a mating element mounted on the second bearing ring, in particular bearing outer ring. Another embodiment provides that the counter surface is formed by the second bearing ring, in particular bearing outer ring itself.

According to an embodiment of the invention, the mating surface extends at least partially or completely in the axial direction of the rolling bearing, that is, in the direction of the axis of rotation. Additionally or alternatively, the mating surface may also extend at least partially or completely in the radial direction of the rolling bearing. In principle, a sealing of the bearing gap along an axial, radial or axial-radial sealing surface is possible.

According to one embodiment of the invention, the sealing disc extends in the direction of the first bearing ring, in particular bearing inner ring and / or from the shaft, preferably starting from the first bearing ring, in particular bearing inner ring and / or the shaft, radially outwardly and surrounds a counter-surface forming component. This component may be, for example, the aforementioned counter element or part of the bearing outer ring. The mating surface can be directed radially outwards, thus extending partially or exclusively in the axial direction.

In particular, in the last-mentioned embodiment, the sealing disc has a circumferential groove into which the component forming the counter-surface engages in the axial direction. In this way, a lifting off of the section of the sealing disk resting against the mating surface is effected in the radial outward direction, preferably by an axial-radial tilting movement of the corresponding section of the sealing disk due to the centrifugal force acting on this section.

Preferably, the sealing disc is made of an elastomer. However, there are also other elastic materials into consideration.

Due to the fact that the sealing disk rotates, it also acts advantageously as a centrifugal disk. To enhance this effect, according to a preferred embodiment of the invention, the sealing disc may have a surface profile with notches and / or projections extending in the radial direction.

The rolling bearing according to the invention is designed in particular as a radial or radial-axial bearing, wherein the bearing gap is a radial gap. In principle, however, the invention is also applicable to thrust bearings and / or an axial bearing gap. In this respect, the bearing inner ring may have a smaller outer diameter than the bearing outer ring, in particular an outer diameter which is smaller than the inner diameter of the bearing outer ring, wherein the outer bearing ring preferably surrounds the bearing inner ring, but does not have. Therefore, the bearing inner ring may also be referred to as the first bearing ring and the bearing outer ring as the second bearing ring.

In particular, in the case of a radial or radial-axial bearing, the sealing disk will generally extend, at least for the most part, in the radial direction. However, the effect according to the invention can also be achieved in the case of a sealing disk extending largely or exclusively in the axial direction. In the latter case, the sealing disc may for example have a sleeve shape and expand to increase the sealing gap in the radial direction when it is acted upon by the centrifugal force. Also, a plurality of particular arcuate sealing discs could be arranged one behind the other in the circumferential direction to seal the bearing gap. The sealing disks can then be formed, for example, by a sleeve cut at an axial end in the axial direction, in particular with a multiplicity of notches distributed over the circumference.

In a medical or cosmetic instrument, in particular a hand instrument, such as a dental hand instrument, or a surgical instrument, such as a minimally invasive surgical instrument, according to the present invention, a rotating shaft for receiving a tool or a tool is provided and the shaft is stored in at least one rolling bearing according to the invention.

Due to the design of the rolling bearing according to the invention, adequate lubrication, which is preferably carried out by oil or grease, of the Rolling be ensured. This minimizes the risk that the lubricant will be washed out of the bearing during a disinfection process, for example with steam disinfection, to which the rolling bearing or the entire instrument is subjected. Even during operation of the rolling bearing, the penetration of deposits or dirt particles, for example when using the surgical instrument in a bloodstream, is avoided. As shown, the corresponding bearing gap between bearing inner ring and bearing outer ring is preferably completely sealed by abutment of the bearing on the counter surface by abutment of the sealing disk, but with a rotating shaft the sealing disk lifts off from the counter surface and a generally comparatively small gap, in particular a labyrinth, releases. This minimizes losses due to bearing friction.

The fact that the sealing disc according to the invention not only minimizes the sealing gap, but preferably also has the function of a centrifugal disc, which ejects harmful particles to the outside and thus keeps away from the bearing interior, a particularly good sealing of the bearing can be achieved.

According to the invention it can be provided that the sealing disk "runs in" during the commissioning of the rolling bearing, that is to say that it initially rests against the counter-surface even in the peripheral state. In the course of time, however, the sealing disk and / or the mating surface will wear out in such a way due to wear that the desired lifting takes place.

The invention will be described by way of example with reference to exemplary embodiments and the figures.

• 1a den Zustand einer Dichtscheibe in einem erfindungsgemäßen Wälzlager bei der Drehzahl Null;
• 1b den Zustand der Dichtscheibe in dem erfindungsgemäßen Wälzlager bei umlaufendem Lagerinnenring;
• 2a eine alternative Gestaltung einer Dichtscheibe in einem erfindungsgemäßen Wälzlager bei stehendem Lagerinnenring;
• 2b die Dichtscheibe aus der 2a bei umlaufendem Lagerinnenring;
• 2c eine weitere Gestaltung einer Dichtscheibe;
• 3 eine exemplarische Darstellung eines zahnärztlichen Handinstrumentes (Dentalhandstücks), bei dem wenigstens ein erfindungsgemäßes Wälzlager vorgesehen werden kann;
• 4 eine exemplarische Darstellung eines chirurgischen Instruments, bei dem wenigstens ein erfindungsgemäßes Wälzlager vorgesehen werden kann.

Show it:

• 1a the state of a sealing washer in a rolling bearing according to the invention at zero speed;
• 1b the state of the sealing disc in the rolling bearing according to the invention with circulating bearing inner ring;
• 2a an alternative design of a sealing washer in a rolling bearing according to the invention with the bearing inner ring;
• 2 B the sealing washer from the 2a with circumferential bearing inner ring;
• 2c another design of a sealing washer;
• 3 an exemplary representation of a dental hand instrument (dental handpiece), in which at least one inventive rolling bearing can be provided;
• 4 an exemplary representation of a surgical instrument in which at least one inventive rolling bearing can be provided.

In the rolling bearing according to the 1 are between a bearing inner ring (first bearing ring) 1 and a bearing outer ring (second bearing ring) 2 a variety of rolling elements 3 in a storage gap 4 between the bearing inner ring 1 and the bearing outer ring 2 positioned, the bearing gap 4 through a sealing washer 6 on the bearing inner ring 1 is connected, for example, the front side, is sealed.

The bearing inner ring 1 runs around the axis of rotation 5 around. The bearing outer ring 2 is in particular stationary. Because the gasket 6 together with the bearing inner ring 1 revolves, acts on this one centrifugal force, which increases with speed of the sealing disc 6 increases.

With stationary bearing inner ring 1 and thus without exposure to the centrifugal force is the sealing disc 6 with a section 6.1 on the opposite surface 7 of a counter element 8th , here radially inside the bearing outer ring 2 is mounted on. This is in the 1a shown.

If, however, the bearing inner ring 1 and thus the sealing disc 6 is circulated, the centrifugal force acts on the section 6.1 and pulls it radially outward. By doing that section 6.1 angled on the remaining body 6.2 the sealing disc 6 connected is the section 6.1 radially outwardly and forced so far axially deflected that between the sealing disc 6 or the section 6.1 and the counter surface 7 a small gap is created. As a result, an undesirable braking of the bearing inner ring 1 or avoided unwanted wear. This is in the 1b shown.

Preferably, the section 6.1 , as that part of the gasket 6 , which is on the opposite surface 7 adjacent surface forms due to a corresponding volume and / or a corresponding density on a relatively large mass. In particular, the section 6.1 in an axial section through the rolling bearing on a greater thickness than a subsequent axial section. Preferably, the section forms 6.1 the free end of the sealing washer 6 , The said section adjoining in the axial direction may represent a weakening of the material, which may be a lifting off of the section 6.1 from the opposite surface 7 favored. The subsequent in the axial direction Section with the preferably comparatively smaller thickness extends in particular beyond the angled connection or forms it, as shown by way of example in FIGS 1a and 1b is shown. For example, the section with the comparatively smaller thickness extends from a comparatively thicker foot, the front side of the bearing inner ring 1 is connected or is formed by this, to a comparatively thicker end portion of the sealing disc 6 that is identical to the section 6.1 , which is on the opposite surface 7 abutting surface is, or is in the axial direction by a predetermined amount over the section 6.1 extends beyond.

In the embodiment shown by way of example according to FIGS 1a and 1b dives the counter element 8th in the axial direction in a circumferential groove 6.3 the sealing disc 6 one, so that the counter element 8th from the gasket 6 is encompassed.

Deviating from the representation in the 1a . 1b could the gasket 6 also in one piece with the bearing inner ring 1 be executed. The counter element 8th could be integral with the bearing outer ring 2 be executed. Finally, it is also possible to use the sealing washer 6 on a rotating bearing outer ring 2 connect or train in this to achieve appropriate functionality.

As indicated by the dashed lines in the 1a is suggested, the gasket can 6 in the radial direction notches and / or projections 9 having a slinger function of the sealing disc 6 favor.

In the embodiments according to the 2a to 2c is the counter surface 7 deviating from the in the 1a and 1b axial extent shown extending in the radial direction. This achieves a radial seal, in contrast to an axial seal. An axial-radial seal is possible in principle.

In the embodiment according to the 2a and 2 B the sealing washer deforms 6 elastic. For this purpose, the focus of the gasket 6 set such that by the acting centrifugal force a the sealing disc 6 deforming, the section 6.1 from the opposite surface 7 lifting moment is generated.

Furthermore, in the 2c exemplified that in addition to an elastically deformable sealing washer 6 or alternatively to the elastic deformability of the sealing disc 6 a storage 10 the sealing disc 6 elastically deformable by a on the sealing disc 6 acting centrifugal force can be performed to the desired lifting of the sealing disc 6 from the opposite surface 7 to reach above a limit speed. Again, the center of gravity of the gasket 6 be set such, for example, by a corresponding axial extent of the sealing disc 6 , preferably the section 6.1 and / or with a in the axial direction at the free end of the sealing disc 6 provided part with comparatively greater density that the center of gravity in the direction of the axis of rotation 5 , that is the axial direction, next to the fulcrum of the bearing 10 and in particular outside of the body 6,2 of the sealing disk extending in the radial direction 6 lies.

In the in the 3 exemplified dental hand instrument, the sectional view only the front part with a housing 11 , which is called head housing, shows in which a wave 12 by means of rolling bearings 13 . 14 is rotatably mounted on the shaft 12 a rotor 15 attached in the form of a turbine wheel, which is driven by compressed air. At the axial end of the shaft 12 can be a tool 16 be attached. A rolling bearing or both rolling bearings 13 . 14 can be provided with the seal according to the invention.

In the in the 4 exemplified surgical instrument is a shaft 12 , which is driven by a motor M, by means of the rolling bearing 13 in particular mounted in a floating and rotatable manner, wherein on the shaft 12 a tool 16 is attached in the form of a cutting tool or milling tool. Again, this is the tool 16 as in the dental hand instrument according to the 3 at a free or front end of the shaft 12 stored.

The rolling bearing 13 is in a housing 11 stored, being attached to the housing 11 in the illustrated embodiment, a shaft 12 enclosing section 17 which adjoins this close to the tool 16 extends. In particular, the wave 12 and the section 17 flexibly designed so that they can be bent or elastically bendable. The section 17 For example, it can be designed as a flexible hose, in particular to a rigid housing 11 connected.

In an application of the in 4 The illustrated surgical instrument may be a bloodstream 18 or other body fluid flow within the section 17 along the wave 12 stream and over an outlet 19 be removed from the instrument. This can be a vortex 20 of the blood or, in general, of the body fluid in the region of the outlet 19 or between the outlet 19 and the rolling bearing 13 result. This favors that particles or deposits in the rolling bearing 13 penetrate, but what is reliably avoided by the bearing seal according to the invention.

A surgical instrument having at least one antifriction bearing according to the invention can also be embodied as a minimally invasive surgical instrument which, in its application, is pushed overall through a bloodstream such as a vein or artery, for example to remove deposits in the bloodstream by means of a milling cutter train or cutting tool.

LIST OF REFERENCE NUMBERS

1

first bearing ring

2

second bearing ring

3

rolling elements

4

bearing gap

5

axis of rotation

6

sealing washer

6.1

section

6.2

body

6.3

circumferential groove

7

counter surface

8th

counter-element

9

Grooves / projections

10

storage

11

casing

12

wave

13

Rolling

14

Rolling

15

rotor

16

Tool

17

section

18

bloodstream

19

outlet

20

whirl

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• EP 0689801 A2 [0004]
• DE 102012000757 A1 [0005]
• EP 0497139 B1 [0006]

Claims (16)

Rolling bearing 1.1 having a first bearing ring (1) and a second bearing ring (2) and a plurality of rolling on the first bearing ring (1) and the second bearing ring (2) rolling elements (3) between the first bearing ring (1) and the second bearing ring (2) are positioned in a bearing gap (4); wherein 1.2 at least one of the bearing rings, the first bearing ring (1) and / or the second bearing ring (2), is positioned circumferentially about a rotation axis (5) and with 1.3 a sealing washer (6), which is provided for sealing the bearing gap (4), which rotates with the encircling bearing ring about the axis of rotation (5) and together with a counter-surface (7) defines a sealing gap; characterized in that 1.4 the sealing disc (6) is made of an elastic material and / or is elastically mounted and extends in the direction of the counter surface (7), that the sealing disc (6) and / or the bearing (10) of the sealing disc (6) is elastically deformable as a function of a rotational speed of the sealing disc (6) by a centrifugal force acting on the sealing disc (6), whereby the sealing gap increases or decreases as a function of the rotational speed. Rolling bearing according to Claim 1 , characterized in that the rolling bearing is designed as a radial or radial-axial bearing, with the first bearing ring (1) as a bearing inner ring and the second bearing ring (2) as a bearing outer ring. Rolling bearing according to Claim 1 or 2 , characterized in that the sealing disc (6) in an axial section through the rolling bearing has a curved, angled and / or uneven shape. Rolling bearing according to one of Claims 1 to 3 , characterized in that the sealing disc (6) at a speed below a predetermined limit speed against the counter surface (7) and at a speed above the limit speed by the centrifugal force of the counter surface (7) is lifted. Rolling bearing according to one of Claims 1 to 4 , characterized in that the sealing disc (6) is mounted at least indirectly on the first bearing ring (1) and / or in the first bearing ring (1) mounted shaft (12) or is integral with this / this executed. Rolling bearing according to Claim 5 , characterized in that the counter surface (7) by the second bearing ring (2) or on the second bearing ring (2) mounted counter element (8) is formed. Rolling bearing according to one of Claims 1 to 6 , characterized in that the counter surface (7) extends at least partially or completely in the axial direction of the rolling bearing. Rolling bearing according to one of Claims 1 to 7 , characterized in that the counter surface (7) extends at least partially or completely in the radial direction of the rolling bearing. Rolling bearing according to one of Claims 5 to 8th , characterized in that the sealing disc (6) in the direction of the first bearing ring (1) and / or the shaft (12) extends radially outwardly and the counter surface (7) forming part engages, wherein the counter surface (7) radially to is directed outside. Rolling bearing according to Claim 9 , characterized in that the sealing disc (6) has a circumferential groove (6.3) into which engages the counter surface (7) forming component in the axial direction. Rolling bearing according to one of Claims 1 to 10 , characterized in that the sealing disc (6) is made of an elastomer. Rolling bearing according to one of Claims 1 to 11 , characterized in that the sealing disc (6) has a surface profile with radially extending notches and / or projections (9). Rolling bearing according to one of Claims 1 to 12 , characterized in that the sealing disc (6) connected to a peripheral bearing ring (1, 2) or formed by this base body (6.2) and an angle connected thereto portion (6.1) which limits the sealing surface with the counter surface (7) , wherein the section (6.1) extends in the direction of the axis of rotation (5) and has a comparatively greater thickness and / or mass than a part of the sealing disc (6) adjoining it in the direction of the main body (6.1). Medical or cosmetic instrument, in particular hand instrument or surgical instrument, comprising a rotating shaft (12) for receiving a tool (16) or with a tool (16), characterized in that the shaft (12) in at least one rolling bearing (13, 14 ) according to one of Claims 1 to 13 is stored. Medical instrument according to Claim 14 executed as a dental hand instrument, wherein on the shaft (12) a dental tool (16) is stored or storable. Medical instrument according to Claim 14 executed as a surgical instrument, in particular minimally invasive surgical instrument, wherein on the shaft (12) a surgical cutting tool or milling tool (16) is mounted or storable.

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