Electric hand tool

Abstract

Electric hand tool (10), in particular an aseptic surgical saw, comprising: - a housing (20) with a handle (30); - an electric drive (200) with a carrier (210) and a drive element (220); wherein the carrier (210) is arranged in the housing (20) in a rotationally fixed manner, - an electrical energy unit (70) for supplying electricity to the drive (200); - a control unit (90) for controlling the electrical supply of the drive (200); - a switch (80) for actuating the drive (200); wherein the housing (20) has a longitudinal axis (102), wherein the handle (30) has a transverse axis (101) transverse to the longitudinal axis (102), wherein the electrical energy unit (70) is arranged in the handle (30) along the transverse axis (101) so as to be detachable and removable, or in the housing (20) along the longitudinal axis (102) so as to be detachable and removable, wherein the drive element (220) is connected to a tool (60) in a rotationally fixed manner, characterized in that the drive element (220) is set into an oscillating movement by means of the control unit (90) in such a way that the tool (60) is also set into an oscillating movement.

Description

background

[0001] The invention relates to an electric hand tool, in particular an aseptic surgical saw, comprising: - a housing with a handle; - an electric drive with a carrier and a drive element; wherein the carrier is arranged in the housing in a rotationally fixed manner, - an electrical energy unit for the electrical supply of the drive; - a control unit for controlling the electrical supply of the drive; - a switch to operate the drive; wherein the housing has a longitudinal axis, wherein the handle has a transverse axis transverse to the longitudinal axis, wherein the electrical energy unit is arranged in the handle so as to be detachable and removable along the transverse axis or in the housing so as to be detachable and removable along the longitudinal axis, wherein the drive element is connected to a tool in a rotationally fixed manner.

[0002] The invention further relates to a drive for the hand tool described above, comprising: - a carrier; - a bearing associated with the carrier for a rotating bearing of a connecting piece for receiving a ferritic drive element; - at least one coil. State of the art

[0003] US 2023 / 0009552 A1 discloses a surgical tool in which an aseptic power module can be inserted and removed from the tool. This ensures that the power module is removed during disinfection of the surgical tool in an autoclave and is not exposed to thermal stress. The rotary motion of the drive is transmitted to the oscillator via a bevel gear.

[0004] From EP1428625A1 an oscillation drive is known in which the axis of a drive shaft and the axis of an output shaft are parallel to each other.

[0005] DE 11 2021 004 591 T5 discloses an oscillating power tool in which an oscillating member or oscillating fork is coupled to the eccentric bearing to convert a rotary motion of the eccentric bearing into an oscillating motion. A drive shaft is connected to an eccentric shaft, which is connected to the eccentric bearing in such a way that a rotary motion of the drive shaft is converted into a wobbling motion of the eccentric bearing, causing the oscillating member to undergo a reciprocating or oscillating motion.

[0006] EP0267389A2 describes a mechanical scanning device for generating an optical scanning beam by using a rotating mirror, wherein the mirror and its supports act as a resonant galvanometer or torsion bar by means of an inductive oscillating drive. Short description

[0007] The invention relates to an electric hand tool, in particular an aseptic surgical saw, comprising: - a housing with a handle; - an electric drive with a carrier and a drive element; wherein the carrier is arranged in the housing in a rotationally fixed manner, - an electrical energy unit for the electrical supply of the drive; - a control unit for controlling the electrical supply of the drive; - a switch to operate the drive; wherein the housing has a longitudinal axis, wherein the handle has a transverse axis transverse to the longitudinal axis, wherein the electrical energy unit is arranged in the handle so as to be detachable and removable along the transverse axis or in the housing so as to be detachable and removable along the longitudinal axis, wherein the drive element is connected to a tool in a rotationally fixed manner.

[0008] The drive element is set into an oscillating movement by means of the control unit in such a way that the tool is also set into an oscillating movement.

[0009] The invention further relates to a drive for the hand tool described above, comprising: - a carrier; - a bearing associated with the carrier for a rotating bearing of a connecting piece for receiving a ferritic drive element; - at least one coil.

[0010] The drive element is inductively excited by means of at least one coil controlled by a control unit in such a way that the drive element exerts an oscillating movement in the direction.

[0011] The advantage is that when disinfecting the surgical tool in an autoclave, the drive, control unit and electrical power unit can be removed so that they are not exposed to harmful temperatures.

[0012] The drive is an electrically oscillating drive, so that an eccentric is not required and balancing is therefore unnecessary.

[0013] In one variant, the control unit can be arranged in the handle together with the electrical energy unit in a detachable and removable manner, or the control unit can be arranged in the housing together with the drive in a detachable and removable manner.

[0014] The advantage is that there are two alternatives for assigning the control unit.

[0015] In a special variant, the drive, the electrical power unit, and the control unit together form an insert. The insert can be removed from the second opening.

[0016] The advantage is that the removable components form a compact unit that can be more easily removed from the housing.

[0017] In another special variant, the drive, the electrical power unit, and the control unit are enclosed together in a first fluid-tight enclosure. The temperature within the first enclosure can be adjusted below a predetermined value using an external cooling circuit.

[0018] The advantage is that the items within the first shell are protected against the autoclave temperatures, while the remaining components can be disinfected in the autoclave.

[0019] The advantage is that the already disinfected surgical tool is not re-contaminated by the potentially contaminated drive and the potentially contaminated electrical power unit and control unit.

[0020] In another variant, the housing and the handle as well as the remaining components except the electrical power unit, the drive and the control unit will be disinfected in an autoclave.

[0021] The advantage is that when disinfecting the surgical tool in an autoclave, the drive, control unit and electrical power unit can be removed so that they are not exposed to harmful temperatures.

[0022] In a special variant, a first fluid-tight enclosure surrounds the electrical power unit, and a second fluid-tight enclosure surrounds the drive unit and the control unit. The temperature within the first enclosure and the second enclosure can be adjusted below a predetermined value using an external cooling circuit. The advantage is that when the surgical tool is disinfected in an autoclave, the drive unit, the control unit, and the electrical power unit are not exposed to harmful temperatures.

[0023] In one variant, the drive includes a rotary drive.

[0024] The advantage is that the oscillation form is similar to the usual oscillation form from the state of the art.

[0025] In an alternative variant, the drive is a linear drive.

[0026] The advantage is that the cut made by the tool, e.g. a saw, is a straight and precise cut.

[0027] In an alternative variant, the drive is a piezoelectric drive, an induction drive or a belt drive.

[0028] The advantage is that different types of drives are available.

[0029] The above aspects of this disclosure and other aspects are explained in more detail below with reference to the accompanying drawings. Character list Fig. 1 a schematic side view of an electric hand tool, Fig. 2 a schematic plan view of a drive with the same direction for longitudinal axes, Fig. 3 a schematic side view of the drive from Fig. 2, Fig. 4 a schematic plan view of a drive with safe gaps, Fig. 5 a schematic side view of the drive from Fig. 4, Fig. 6 a schematic enlargement of the safe columns from Fig. 4, Fig. 7 a schematic plan view of a drive with a bending drive element, Fig. 7a a schematic plan view of a drive with a bearing, Fig. 8 a schematic side view of the drive from Fig. 7, Fig. 9 a schematic plan view of a drive with unequal direction for longitudinal axes and with an offset of a rotation axis to a longitudinal axis of a drive element, Fig. 10 a schematic side view of the drive from Fig. 9, Fig. 11 a schematic plan view of a drive with unequal direction for longitudinal axes and without an offset of a rotation axis to a longitudinal axis of a drive element, Fig. 12 a schematic side view of the drive from Fig. 11, Fig. 13 a schematic plan view of a drive with unequal direction for longitudinal axes with safe gaps, Fig. 14 a schematic side view of the drive from Fig. 13, Fig. 15 a schematic plan view of a drive with an electric motor, Fig. 16 a schematic side view of the drive from Fig. 15, Fig. 17 a schematic front view of the drive from Fig. 15, Fig. 18 a schematic plan view of a linear drive with rotating action, Fig. 19 a schematic plan view of a linear actuator with linear action, Fig. 20 a schematic side view of the drive from Fig. 19, Fig. 21 a schematic front view of the drive from Fig. 19. Detailed description

[0030] Fig. 1 shows a schematic side view of an electric hand tool 10, which may be a surgical tool, in particular an aseptic surgical saw, comprising the following: a housing 20 with a handle 30; a drive 200 arranged in the housing 20 in a rotationally fixed manner; an electrical power unit 70 for supplying electricity to the drive 200; a control unit 90 for controlling the electrical supply to the drive 200; and a switch 80 for actuating the drive 200.

[0031] The electrical energy unit 70 is arranged in the housing 20 along a longitudinal axis 102 in a detachable and removable manner and can be removed from a second opening 22, which can be closed in a fluid-tight manner by means of a second cover 21. The drive 200 can also be arranged in the housing 20 in a detachable and removable manner. The housing 20 can have a main housing 26 and a secondary housing 25. As in Fig. 1, the drive 200 is located, for example, in the secondary housing 25, which is designed as a separate housing that can be connected to the main housing 26 and can be connected to the main housing 26, for example, via a screw connection, a clamp connection, or a plug connection. In this case, the secondary housing 25 together with the drive 200 can be removed from the main housing 26. It is expedient for the control unit 90 to also be arranged in the secondary housing 25, so that when the secondary housing 25 is removed from the main housing 26, the control unit 90 is also removed from the main housing 26. The main housing 26 and the handle 30 are now suitable for a disinfection process in an autoclave. Fig. 1 further shows that the electrical energy unit 70 is detachably arranged in the handle 30 along a transverse axis 101 and can be removed via a first opening 32, which can be closed in a fluid-tight manner by means of a first cover 31.

[0032] The surgical saw must typically be externally cleaned and then completely disinfected after each use, i.e., after each operation. For this purpose, the surgical saw is placed in an autoclave after external cleaning and disinfected, usually at a temperature of 121°C to 170°C and a pressure of 2 bar. This temperature range of 121°C to 170°C can be harmful to the standard components of the surgical saw, namely the drive 200, the control unit 90, and the electrical power unit 70.

[0033] According to a further embodiment of the invention, the drive 200, together with the control unit 90 and the electrical power unit 70, are removed from the housing 20 so that the housing 20 and the components remaining therein can be disinfected in an autoclave. The control unit 90, the drive 200, and the electrical power unit 70 are cleaned separately and reinserted into the autoclaved housing 20 or the disinfected handle 30. The surgical saw is now disinfected and ready for the next use.

[0034] In the Fig. In the embodiment illustrated in Figure 1, the surgical tool 10 additionally comprises a first sheath 311 that surrounds the electrical energy unit 70. The first sheath 311 comprises a first line 302 for the inflow of a cooling fluid into the first sheath 311 and a second line 303 for the outflow of the cooling fluid from the first sheath 311. The directions of the inflow 312 and the outflow 313 are indicated for illustrative purposes. The cooling fluid can be, for example, a gaseous disinfectant or any other cooling fluid. The surgical tool 10 can be connected to a cooling fluid supply device to provide a cooling effect for the electrical energy unit 70. The entire surgical tool 10, together with the cooling fluid supply device, can be placed in an autoclave for disinfection. The objects outside the first sheath 311 are disinfected as described above.The objects within the first enclosure 311 are protected from the autoclave temperatures. Depending on the location of the electrical power unit 70, the enclosure 311 can be arranged along the longitudinal axis 102 in the main housing 26 or along the transverse axis 101 in the handle 30. In the embodiment shown in . Fig. In the further embodiment illustrated in Figure 1, the surgical tool 10 additionally comprises a second sheath 321 that surrounds the drive 200. The second sheath 321 comprises a third line 304 for the inflow of a cooling fluid into the second sheath 321 and a fourth line 305 for the outflow of the cooling fluid from the second sheath 321. The directions of the inflow 322 and the outflow 323 are indicated for illustrative purposes. The cooling fluid can be, for example, a gaseous disinfectant or any other cooling fluid. The surgical tool 10 can be connected to a cooling fluid supply device to provide a cooling effect for the drive 200. The sheath 321 can also surround the control unit 90. If the drive 200, the control unit 90 and the electrical energy unit 70 are all arranged along the longitudinal axis 102 in the housing 20, then they can all be surrounded by a single shell such as the second shell 321.The drive 200 and the control unit 90 can be arranged in the housing 20 and simultaneously in the handle 30 if space requirements dictate. This means that the space shared by the housing 20 and the handle 30 is available for the drive 200 and the control unit 90. Suitable examples of this are shown in the . Fig. 13, Fig. 15 and Fig. 18 shown.

[0035] According to Fig. 13, the drive 200 may, for example, be partially arranged in the handle 30. At least one coil 233, 234 and at least a part of a drive element 220 may be arranged in the handle 30. According to Fig. 15, an electric motor 85 can be arranged, for example, in the handle 30 and a connecting piece 52 in the housing 20. A direction of oscillation 221 of a driver 82 or a plane in which the oscillation takes place must then be parallel to a longitudinal axis 64 of the tool, and tines of a fork 65 must be oriented perpendicular to the longitudinal axis 64 of the tool. According to Fig. 18, the drive 200 can be arranged, for example, in the handle 30 and the connecting piece 52 in the housing 20. The oscillation direction 221 of the drive element 220 must then be parallel to the longitudinal axis 64 of the tool, and the tines of the fork 65 must be oriented perpendicular to the longitudinal axis 64 of the tool.

[0036] Fig. 2 shows a schematic plan view of the drive 200 from Fig. 1. In one embodiment of the invention according to Fig. 2, the drive 200 comprises a carrier 210, which is arranged in a rotationally fixed manner in the housing 20. The carrier 210 has a bearing 51 that can rotate about a rotation axis 54. A drive element 220 made of a magnetically attractable material is connected to the bearing 51 via a connecting piece 52. At least one coil 231, 232 is assigned to the carrier 210 and is arranged laterally to the drive element 220 at a distal distance from the bearing 51. When an electric current flows through the coil 231, 232, a magnetic field is created that attracts or repels the drive element 220. When a first coil 231 and then the second coil 232 are alternately supplied with electric current, an oscillation is created at the drive element 220, which oscillates around the rotation axis 54 in the direction 221.Two stoppers 225 and 226 located on the carrier 210, which are arranged closer to the drive element 220 than the coil 231, 232, prevent the drive element 220 from coming into contact with the coil 231, 232. The rotationally oscillating movement of the drive element 220 is transmitted by means of the connecting piece 52 and via the bearing 51 to a tool 60 connected to the connecting piece 52, so that the tool 60 also experiences an oscillating pivoting in direction 71. The tool 60 can be a saw with a cutting edge 63 having a sawtooth. The connection between the connecting piece 52 and the tool 60 is known from the prior art and can be, for example, a plug connection, a clamp connection or a screw connection. Fig. 3 is a schematic side view of the drive 200 of Fig. 2. Fig. 3 shows a schematic plan view of the drive 200 from Fig. 2. A control unit 90 controls the flow of electrical current through the coil 231, 232.

[0037] A further embodiment of the invention according to Fig. 4 differs from the embodiment according to Fig. 2 by the fact that, as in Fig. 6, a detailed enlargement V shows that at a distal end of the drive element 220 relative to the bearing 51, the drive element 220 has a circular contour 250. A first gap 251 is formed between the first coil 231 and the circular contour 250 of the drive element 220, preventing contact between the drive element 220 and the first coil 231. Several coils can be arranged at this end of the drive element 220. Several such circular contours can be formed at this end of the drive element 220, opposite which several coils are arranged. Fig. 5 is a schematic side view of the drive 200 of Fig. 4. In the Fig. 6, a detailed enlargement V shows a first iron core 241 for the first coil 231, which is arranged in the first coil 231 in order to thereby enhance the electromagnetic effect of the coil 231. This causes an increase in the force generated at the cutting edge 63. Analogously, a second iron core 242 can be surrounded by the second coil 232. A further embodiment of the invention according to Fig. 7 differs from the embodiment according to Fig. 2 in that the drive element 220 is mounted at a distal end relative to the bearing 51. The bearing allows rotation and also translation at this point. For example, the drive element 220 comprises a fork 65. A support 66 with a longitudinal support axis 67 is assigned to the carrier 210. The fork 65 is in contact with the support 66 such that local rotation and local translation of the drive element 220 are possible at this point. A first coil 231 is arranged centrally on the carrier 210 with respect to the axes 54 and 67. The coil 231 is spaced from the drive element 220 by a gap. A control unit 90 controls the electrical current flow through the coil 231, creating an electromagnetic field that attracts or repels the drive element 220 in the linear direction 221. A second coil 232 may enhance the attraction and repulsion effect of the drive element 220.The electrical current flow is controlled by the control unit 90 such that an alternating current flow creates an alternating magnetic field around the drive element 220, which causes an oscillating movement of the drive element 220 in direction 221 and thus an oscillating movement of the tool 60 in direction 71. The drive element 220 comprises ferritic or soft magnetic material that can be attracted and repelled by the alternating magnetic field. To further enhance the attraction and repulsion effect of the drive element 220, a permanent magnet can be arranged in the drive element 220 in the immediate vicinity of the coils 231 and 232 and / or the coils 231 and 232 can be equipped with iron cores. Fig. 8 is a schematic side view of the drive 200 of Fig. 7. The drive element 220 from Fig. 7 is a flexible element that bends back and forth in direction 221 under the influence of the alternating magnetic field generated by coils 231 and 232. The drive element 220 is a bending drive element.

[0038] In the previous embodiments, the main axis 64 of the tool 60 and the main axis 224 of the drive element 220 are substantially parallel to each other. Alternatively to this embodiment according to Fig. 7 may according to Fig. 7a, instead of the support 66, the bearing 51 at this end of the drive element 220 is connected to the drive element 220 in a rotationally fixed manner. A fork 65 is also omitted here. Excitation of the coils 231, 232 causes a rotational oscillation of the connecting piece 52 in the direction 71.

[0039] A further embodiment of the invention according to Fig. 9 differs from the previous embodiments in that the main axis 64 of the tool 60 and the main axis 224 of the drive element 220 are not substantially parallel to each other, but perpendicular or skewed. In the embodiment according to Fig. 9, the drive 200 comprises a carrier 210, which is arranged in a rotationally fixed manner in the housing 20. The carrier 210 has a bearing 51 rotatable about a rotation axis 54. A drive element 220 made of a ferritic material is connected to the bearing 51 via a connecting piece 52. The connecting piece 52 is connected in a rotationally fixed manner to the drive element 220 essentially in the center of the drive element 220. The connecting piece 52 is arranged essentially perpendicular to the drive element 220. Fig. 9 shows that the first coil 231 and the second coil 232 are arranged near one end of the drive element 220 on the support 210, and the third coil 233 and the fourth coil 234 are arranged near another end of the drive element 220 on the support 210. When an electric current flows through the coils 231, 232, 233, 234, a magnetic field is created that attracts or repels the ferritic drive element 220. When a first coil 231 and then the second coil 232 are alternately supplied with electric current, an oscillation occurs at the drive element 220, which oscillates around the rotation axis 54 in the direction 221. The rotationally oscillating movement of the drive element 220 is transmitted by means of the connecting piece 52 and via the bearing 51 to a tool 60 connected to the connecting piece 52, so that the tool 60 also experiences an oscillating pivoting in the direction 71.Since the axis 54 and the longitudinal axis 224 of the drive element 220 do not intersect, a lever arm results between the bearing 51 and the axis 224, which, in addition to the rotational movement of the drive element 220, also causes a translational movement along the longitudinal axis 224 of the drive element 220. Fig. 10 is a schematic side view of the drive 200 of Fig. 9. The control unit 90 can be integrated into the drive 200.

[0040] An embodiment of the invention according to Fig. 11 differs from the embodiment according to Fig. 9 in that the main axis 224 of the drive element 220 intersects the rotation axis 54. This means that no lever arm is created between the main axis 224 and the rotation axis 54. Fig. 12 is a schematic side view of the drive 200 of Fig. 11. The embodiment according to Fig. 13 includes features from Fig. 4 or Fig. 6 and Fig. 11. Fig. 13 shows that the first coil 231 and the second coil 232 are arranged near one end of the drive element 220 on the support 210, and the third coil 233 and the fourth coil 234 are arranged near another end of the drive element 220 on the support 210. The drive element 220 has a circular contour at each end, which is always spaced apart by a gap from the coils 231, 232, 233, 234, thus preventing contact of the drive element 220 with the coils 231, 232, 233, 234. Fig. 14 is a schematic side view of the drive 200 of Fig. 13.

[0041] The embodiment of the drive 200 comprises according to Fig. 15 a carrier 210, to which a bearing 51 and an electric motor 85 are assigned. The electric motor 85 drives a drive shaft 81. The drive shaft 81 is connected in a rotationally fixed manner to a driver 82. A connecting piece 52 is connected to the bearing 51. At one end, the connecting piece 52 has a fork 65. At the other end, the connecting piece 52 is connected to a tool 60. The fork 65 is in contact with the driver 82 in such a way that an oscillating rotational movement of the drive shaft 81 causes a back and forth movement of the fork 65 in the direction 221, so that this movement causes an oscillating rotational movement of the tool 60 in the direction 71. The control unit 90 controls the inductive electric motor 85 such that the drive shaft 81 oscillates back and forth within a predetermined angular range and does not perform complete revolutions.With the aid of a gear (not shown here), complete revolutions of the drive shaft 81 can be converted into a back-and-forth movement of the fork 65 in direction 221 within a predetermined angular range. Fig. 16 is a schematic side view of the drive 200 of Fig. 15. Fig. 17 is a schematic front view of the drive 200 of Fig. 15.

[0042] The embodiment of the drive 200 comprises according to Fig. 18 a carrier 210, to which a bearing 51 and a drive element 220 are assigned. The drive element 220 is driven linearly, e.g., inductively. For this purpose, the drive element 220 is surrounded at least at one end by a coil 231, 232. The control unit 90 controls the current flow through the coils 231, 232 such that they are alternately supplied with electrical current, thus creating an oscillation at the drive element 220 and the drive element 220 oscillates linearly in the direction 221. A driver 82 is connected to the drive element 220 in a rotationally fixed manner. Analogous to Fig. 15, a fork 65 of the connecting piece 52 is in contact with the driver 82 in such a way that an oscillating linear movement of the drive element 220 causes a back and forth movement of the fork 65 in the direction 221, so that this movement causes an oscillating rotational movement of the tool 60 in the direction 71.

[0043] The embodiment of the drive 200 comprises according to Fig. 19 a carrier 210 to which a drive element 220 is assigned. The drive element 220 is driven linearly, for example inductively. For this purpose, the drive element 220 is surrounded at least at one end by a coil 231, 232. The control unit 90 controls the current flow through the coils 231, 232 such that they are alternately supplied with electrical current, thus creating an oscillation at the drive element 220 and the drive element 220 oscillating linearly in direction 221. A connecting piece 52 is connected at one end in a rotationally fixed manner to the drive element 220 and at the other end in a rotationally fixed manner to the tool 60, so that an oscillating linear movement of the drive element 220 causes an oscillating linear movement of the tool 60 in direction 61. Fig. 20 is a schematic side view of the drive 200 of Fig. 19. Fig. 21 is a schematic front view of the drive 200 of Fig. 19.

[0044] For all embodiments, the tool 60 is connected to the connector 52 according to the prior art, e.g., with a plug connection, a screw connection, or a clamp connection. This has the advantage that the connection between the tool 60 and the connector 52 can be made simply and according to the prior art.

[0045] For all embodiments, the tool 60 is a commercially available saw blade formed as an elongated metal strip with saw teeth at one end. The saw blade has a receiving arrangement at the other end for connection to the connector 52.

[0046] For all embodiments, the drive means for driving the drive element 220 can be electrically driven, for example by means of a piezoelectric drive, an induction drive or a belt drive.

[0047] For all embodiments, the connecting piece 52 is operatively connected to the tool 60 such that an oscillating movement of the connecting piece 52 is converted into an oscillating movement of the tool 60.

[0048] The advantage of these described embodiments is that no eccentric is required to generate an oscillation and thus eccentric vibrations are avoided and the weight is reduced.

[0049] Any sensible combination of the embodiments is possible.

[0050] The stopper 225, 226 can be used wherever there is a need to prevent contact between the drive element 220 and a coil 231, 232. Examples of this are, for example, the embodiments shown in Fig. 2, Fig. 3, Fig. 9, Fig. 10, Fig. 11 and Fig. 12 are shown.

[0051] The iron core 241, 242 can be used wherever there is a need to amplify the electromagnetic field. Examples of this are, for example, the embodiments shown in Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 9, Fig. 10, Fig. 11 and Fig. 12 are shown.

[0052] The control unit 90 is necessary for all embodiments. However, it was only used as an example in Fig. 1, Fig. 3, Fig. 5, Fig. 10, Fig. 12, Fig. 15 and Fig. 18. The control unit 90 can be integrated into the drive 200. The advantage is that the drive 200 and the control unit 90 integrated therein can be removed from the housing 20 as a unit or can be enclosed and cooled by the second casing 321 during autoclave disinfection.

[0053] According to the state of the art, all moving parts can be lubricated with a lubricant, such as grease or oil. For this purpose, the areas to be lubricated must be enclosed in a fluid-tight lubricating sleeve filled with the lubricant.

[0054] Soft magnetic or ferritic materials are magnetically attractive materials that can be easily magnetized in a magnetic field. A soft magnetic material amplifies an external magnetic field. An example of this is the iron core for a coil. A permanent magnet, on the other hand, is a hard magnetic material.

[0055] Elastic bearings, such as rubber-metal bearings, are known from the prior art; they allow for torsion and simultaneously function as damping. In all embodiments, an elastic bearing can be used instead of the bearing 51. List of reference symbols 10 surgical tools 20 housings 25 secondary housings 26 Main housing 30 handle 51 Storage 52 connecting piece 54 Rotation axis of the bearing 60 tools 61 linear movement direction of the tool 63 Cutting edge 64 Longitudinal axis of the tool 65 fork 66 support 67 Column longitudinal axis 70 electrical energy units 71 Direction of vibration of the tool 80 electric motor 81 Drive shaft 82 drivers 90 Control unit 101 Transverse axis 102 Longitudinal axis 200 drive 210 carriers 220 drive element 221 Direction of vibration of the drive element 224 Longitudinal axis of the drive element 225 first stopper 226 second stopper 231 first coil 232 second coil 233 third coil 234 fourth coil 241 first iron core 242 second iron core 250 contour 251 first gap 252 second gap 311 first shell 302 first line 303 second line 312 directions of flow into the first line 313 directions of outflow from the second line 321 second shell 304 third line 305 fourth line 322 directions of flow into the third line 323 Directions of outflow from the fourth pipe QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This 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

[0000] US 2023 / 0009552 A1

[0003] EP 1428625A1

[0004] DE 11 2021 004 591 T5

[0005] EP 0267389A2

[0006]

Claims

[1] Electric hand tool (10), in particular an aseptic surgical saw, comprising: - a housing (20) with a handle (30); - an electric drive (200) with a carrier (210) and a drive element (220); wherein the carrier (210) is arranged in the housing (20) in a rotationally fixed manner, - an electrical energy unit (70) for supplying electricity to the drive (200); - a control unit (90) for controlling the electrical supply of the drive (200); - a switch (80) for actuating the drive (200); wherein the housing (20) has a longitudinal axis (102), wherein the handle (30) has a transverse axis (101) transverse to the longitudinal axis (102), wherein the electrical energy unit (70) is arranged in the handle (30) along the transverse axis (101) so as to be detachable and removable, or in the housing (20) along the longitudinal axis (102) so as to be detachable and removable, wherein the drive element (220) is connected to a tool (60) in a rotationally fixed manner, characterized by , that the drive element (220) is set into an oscillating movement by means of the control unit (90) in such a way that the tool (60) is also set into an oscillating movement. [2] Drive (200) for a hand tool (10) according to claim 1 comprising: - a carrier (210); - a bearing (51) associated with the carrier (210) for rotatingly supporting a connecting piece (52) for receiving a magnetically attractable drive element (220); - at least one coil (231, 232); characterized by that the drive element (220) is inductively excited by means of the at least one coil (231, 232) controlled by a control unit (90) in such a way that the drive element (220) exerts an oscillating movement in the direction (221). [3] Drive (200) according to claim 2, wherein a tool (60) is connected to the connecting piece (52) in a rotationally fixed manner along a longitudinal axis (64). [4] Drive (200) according to one of claims 2 or 3, wherein the longitudinal axis (64) of the tool coincides with a longitudinal axis (224) of the drive element. [5] Drive (200) according to one of claims 2 to 3, wherein there is an angle between the longitudinal axis (64) of the tool and a longitudinal axis (224) of the drive element. [6] Drive (200) according to one of claims 2 to 5, wherein a contour (250) at one end of the drive element (220) is adapted to fit the coil (231, 232) such that the drive element (220) and the coil (231, 232) do not touch each other. [7] Drive (200) according to one of claims 2 to 5, wherein at least one stopper (225, 226) is associated with the carrier (210) to prevent contact between the drive element (220) and the coil (231, 232). [8] Drive (200) according to one of the preceding claims, wherein an iron core (241, 242) is arranged in the at least one coil (231, 232). [9] Drive (200) according to one of claims 2 to 7, wherein the carrier 210 has a support (66), wherein the drive element (220) comprises a fork (65) which has a contact with the support (66), wherein the drive element (220) is inductively excited by means of the at least one coil (231, 232) controlled by a control unit (90) such that the drive element (220) exerts an oscillating bending movement in the direction (221). [10] Drive (200) for a hand tool (10) according to claim 1 comprising: - a carrier (210); - a bearing (51) associated with the carrier (210) for rotatingly supporting a connecting piece (52) with a fork (65); - an electric motor (85) for driving a drive shaft (81) which is connected in a rotationally fixed manner to a driver (82); wherein the driver (82) is in contact with the fork (65), characterized by , that the drive shaft (81) is moved in an oscillating manner in the direction (221) by means of a control unit (90) such that the connecting piece (52) by means of the driver (82) and the fork (65) performs an oscillating movement around the bearing (51) in the direction (71). [11] Drive (200) for a hand tool (10) according to claim 1 comprising: - a carrier (210); - an electric drive (200) associated with the carrier (210) for driving a drive element (220); - a bearing (51) associated with the carrier (210) for rotatingly supporting a connecting piece (52) with a fork (65); wherein the drive element (220) is connected to a driver (82) in a rotationally fixed manner; wherein the driver (81) is in contact with the fork (65), characterized by , that the drive element (220) is moved in an oscillating manner in the direction (221) by means of a control unit (90) such that the connecting piece (52) exerts an oscillating movement around the bearing (51) in the direction (71) by means of the driver (82) and the fork (65). [12] Drive (200) for a hand tool (10) according to claim 1 comprising: - a carrier (210); - an electric drive (200) associated with the carrier (210) for driving a drive element (220); - connecting piece (52) for connecting to a tool (60); wherein the drive element (220) is connected to the connecting piece (52) in a rotationally fixed manner, characterized by , that the drive element (220) is moved linearly in an oscillating manner in the direction (221) by means of a control unit (90) such that the connecting piece (52) exerts a linear oscillating movement in the direction (61). [13] Drive (200) according to one of claims 2 to 12, wherein the drive (200) is a linear drive or a rotary drive. [14] Drive (200) according to claim 13, wherein the drive (200) is a piezoelectric drive, an induction drive or a belt drive. [15] Hand tool (10) according to one of the preceding claims, wherein the drive and / or the control unit (90) is removably arranged in the housing (20). [16] Hand tool (10) according to one of claims 1 to 14, wherein the control unit (90) is removably arranged in the handle (30).

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