WO2010003393A1

WO2010003393A1 - Power-operated handheld instrument, in particular handheld surgical instrument

Info

Publication number: WO2010003393A1
Application number: PCT/DE2009/000822
Authority: WO
Inventors: Julius Reizner
Original assignee: Geister Medizintechnik Gmbh; Kum Consulting & Trading Gmbh
Priority date: 2008-07-10
Filing date: 2009-06-12
Publication date: 2010-01-14
Also published as: DE102008032404A1

Abstract

The invention relates to a power-operated handheld instrument (1), in particular a power-operated handheld surgical instrument, comprising an electric motor (2), a clamping means (3), which is driven by the electric motor (2), for attachment of a tool (4), for example a drill, a cutter or a saw blade (54), an electronic control module (5), a first actuating means (6) and a second actuating means (7) for controlling the electric motor (2), an energy storage means (8), for example a rechargeable battery (15), and a housing (9). In this case, the electric motor (2) is in the form of a three-phase motor (50), wherein the electronic control module (5) for the electric motor (2, 50) can generate from the energy storage means (8) a three-phase current with a frequency which is designed for achieving a desired rotation speed.

Description

"Power-driven hand-held device, in particular surgery hand-held device"

The invention relates to a power-driven hand-held device, in particular a surgical hand-held device according to the preamble of claim 1 and of claim 2.

WO 2007/002180 A1 discloses a power-driven surgical hand-held device which has an electric motor, a tensioning device driven by the electric motor for fastening a tool, such as a drill, a milling cutter or a saw, an electronic control module, two actuating means for controlling the electric motor , an energy storage and a housing. A disadvantage of such a power-driven hand-held device is complicated control and monitoring of the electric motor serving as the drive unit as well as the exclusive use of a specific sensor type for detecting a position of the actuating means.

The invention has for its object to develop an improved power-driven handset, which has increased reliability and low manufacturing and maintenance costs by a simple structure and in which the adjusting means associated sensors are optimally adapted to their tasks.

This object is achieved on the basis of the features of the preamble of claim 1 or 2 by the characterizing features of claim 1 or 2. In the Subclaims are advantageous and expedient developments specified.

The power-driven hand-held device according to the invention has an electric motor, which is designed as a three-phase motor, from the energy storage of the handset by means of the electronic control module, a three-phase current for the electric motor can be generated, the frequency is tuned to achieve a desired speed by the user. Since the control module is operable without supply of motor data arising during operation of the electric motor, such as rotational speed and / or rotor position, which would have to take place by means of additional sensors installed on the electric motor, the construction of the power-driven hand-held device is considerably simplified. The core of the invention is thus a power-driven handset, which by the use of a three-phase motor in conjunction with a suitable control module for a substantial optimization of the handset in terms of a simple technical structure with a few parts and in terms of the cost of the items especially the engine leads.

The power-driven hand-held device according to the invention comprises two sensors, wherein the first sensor, by which the position of the first actuating means is detectable, as a proximity sensor, in particular as a Hall sensor is formed and wherein the second sensor, by which the position of the second actuating means is detected, formed as a reed sensor is. In this case, signal values of the first sensor are processed by the electronic control module to control the speed of the electric motor by these signal values and in this case the second sensor forms an electrical switch, by which a power supply from the power source to the electronic control module and / or from the energy source the electric motor is switched on and / or off. By such a combination of two different sensor types for the control of the handset, it is possible to maintain both the guaranteed by a proximity sensor such as a Hall sensor high ease of use in the speed control as well as by the use of a reed sensor to reduce energy loss at standstill of the electric motor.

Furthermore, the invention provides for detecting a position of the first actuating means of a proximity sensor, in particular a Hall sensor in a power-driven handset with an electric motor designed as a three-phase motor, wherein signal values of the proximity sensor can be processed by the electronic control module and the speed of the electric motor by these signal values is controllable and further to detect a position of the second actuating means by a Reed sensor, wherein the Reed sensor forms an electrical switch, by which a power supply from the power source to the electronic control module and / or from the power source to the electric motor on and / or off , Such a combination of two different sensor types for the control of the handset, it is possible to maintain both guaranteed by a proximity sensor such as a Hall sensor high ease of use in the speed control as well as by the use of a Reed sensor to reduce energy loss at standstill of the electric motor.

According to the invention it is provided in a power-driven handset with different sensors for the actuating means to form the electric motor as a three-phase motor and to produce by the electronic control module for the electric motor from the energy storage a three-phase current at a frequency which is dependent on the desired speed. Because the control module without a -A-

Supply of resulting in operation of the electric motor motor data such as speed and / or rotor position is operable, which would have to be done by additional sensors, the structure of the power-driven handset is much easier.

The invention further provides to arrange a gear and / or a clutch between the electric motor and the clamping means. This makes it possible to optimally operate tools, since the transmission and / or the coupling permit additional adaptation to the requirements of the tools.

According to the invention, it is also provided to equip the electronic control module with a board which carries all the electronic components of the handset including the proximity sensor and the Reedsensors and to arrange the electronic control module in particular in a handle portion of the housing adjacent to the two actuating means. As a result, a compact design of the control module and thus a simple and inexpensive installation of an essential part of the handset is guaranteed.

According to the invention, the electronic control module is cast in a potting material for protection against contamination and / or against pressure and temperature loads. As a result, the damage that can occur as a result of a leaky housing, be kept within limits, since the control module can withstand the additional burden and must not be replaced in a subsequent repair.

Furthermore, the invention provides for the cast-in electronic control module to be glued to an inner side of the housing or to be applied to the inside of the housing. This ensures that the control module is not moved in its position relative to the adjusting means even during maintenance and thus the existing coordination between the actuating means and the sensors can not be affected.

The invention provides to shield an interior of the housing of the handset by the housing against the pressure and temperature stresses that occur in a steam pressure sterilization of the handset. As a result, the hand-held device is suitable as a power-driven surgical hand device for use in surgery.

An embodiment variant of the invention provides for the electric motor to be designed as an asynchronously operated three-phase motor. Such asynchronous motors are particularly inexpensive to produce due to their simple structure.

A further embodiment variant of the invention provides for the electric motor to be designed as a synchronously operated three-phase motor. Such synchronous motors rotate exactly with the predetermined frequency. As a result, the setting of a desired speed control technology is particularly simple.

In particular, the invention provides for using a brushless or non-contact three-phase motor. Such motors cause much less interference compared with other three-phase motors and are thus suitable for use in an environment with highly sensitive apparatuses to electrical noise.

According to the invention, the housing is formed nonmagnetic at least in the region of the adjusting means. As a result, sensors which respond to magnetic fields can be used. Finally, the invention provides for arranging the first and the second adjusting means outside a housing shell of the housing and for arranging the first and the second sensor within the housing shell of the housing, wherein the respective position of the adjusting means can be detected by the sensors through the housing shell. As a result, only the adjusting means are fully exposed to the high loads on a construction site or in the steam pressure sterilization. The sensors, however, are protected in the interior of the housing.

For the purposes of the invention, an actuating means is to be understood as a manually operable device which is suitable for acting on a sensor. Adjusting means in the context of the invention are, for example, buttons or rotary wheels or slide.

Further details of the invention will be described in the drawing with reference to a schematically illustrated embodiment.

FIG. 1 shows a power-driven hand-held device 1 in a sectional side view. The handset 1 comprises an electric motor 2, a driven by the electric motor 2 clamping means 3 for fixing a tool 4, an electronic control module 5, a first adjusting means STl and a second adjusting means ST2, an energy storage 8 and a housing 9. The first adjusting means STl is by a first button 6 and the second adjusting means ST2 is formed by a second button 7. Furthermore, the handset 1 comprises a first sensor 10 and a second sensor 11. The housing 9 comprises a two-part housing shell 12 and a cover 13, through which a battery compartment 14 can be closed. The energy store 8 is designed as a rechargeable battery 15 and can be fixed to the cover 13. The energy storage 8 is in the installed state with the control module 5 in electrical connection. For this purpose, the control module 5 on three spring-loaded pin contacts 16, 17 and 18, which are pressed by means of springs 19, 20 and 21 against contact surfaces 22, 23 and 24 of the energy storage 8 to contact them reliably. The control module 5 forms a structural unit 25, which is glued in an inner space 26 of the housing 9 on an inner side 27 of the housing 9 in a grip part 28 of the housing 9. The control module 5 comprises a board 29, electronic components 30, 31, the pin contacts 16, 17 and 18, electrical lines 32 and connections 33 for the electric motor 2. Furthermore, the sensors 10 and 11 are arranged on the board 29 and on the buttons 6 and 7 aligned. The assembly 25 receives its spatial form essentially by a potting compound 34, in which in particular the electronic components 30, 31 are embedded. The structural unit 25 has the form of a horizontally and vertically mirrored "L" in the side view shown The exemplary electronic components 30, 31 are embodied, for example, as power electronics for supplying the electric motor 2 and as control electronics The buttons 6 and 7 are arranged on an outer side 36 of the housing 9. The buttons 6 and 7 each comprise a plunger 37, 38, which in guides 39, 40 longitudinally displaceable in each case against a compression spring 41, In this case, a material 43, 44 is arranged in each plunger 37, 38, to which the sensor 10, 11 assigned to the individual push-button 6, 7 reacts the entire plunger or a component of the plunger is formed from this material currency example is the upper switch 6 as the sensor 10 is a proximity sensor associated with 45, which is designed as a so-called Hall sensor 46th To be able to respond to the Hall sensor 46 is in the plunger 37 as a material 43rd a magnet 47 is arranged. When pressing the plunger 37 from its illustrated rest position 137 in the direction of arrow x ', the magnet 47 approaches the Hall sensor 46 along a line of movement A. The respective position of the plunger 37 is detected by the Hall sensor 46. In the control module 5 then takes place a conversion of the signals of the Hall sensor 46 in a corresponding control or power supply of the electric motor 2, if the handset 1 is turned on. In the illustrated embodiment, the lower button 7 as a sensor 11, a reed sensor 48 is assigned. In order to be able to respond to the reed sensor 48, a magnet 49 is likewise arranged in the tappet 38 as material 44. When pushing the plunger 38 from its illustrated rest position 138 in the direction of the arrow x ', the magnet 49 approaches along a line B of the reed sensor 48. The position of the plunger 38 is detected by the reed sensor 48 and performs the full push of the plunger 38 for closing an electrical contact in the reed sensor 48, through which the power supply of the handset is switched on and off. The reed sensor 48 thus finds use as an electrical switch SE.

In the illustrated embodiment, the guides 39, 40, in which the plunger 37, 38 of the buttons 6, 7 are displaceable, bolted to the housing 9. According to an embodiment not shown, it is also provided, at least one of the guides 39, 40 integral with the housing 9 perform.

An energy supply of the electric motor 2, which is designed as a three-phase motor 50, takes place from the energy store 8 with the interposition of the control module 5. The control module 5 is controlled by means of contactless control units 51, 52. The first contactless control unit 51 is formed by the first adjusting means ST1 and the sensor 10. The second contactless control unit 52 is formed by the second adjusting means ST2 and the sensor 11. In the control module 5, the signals or signal values of the sensors 10 and 11 are evaluated. On the basis of the evaluation, a three-phase current is then possibly generated from the direct current provided by the energy store 8 whose frequency is matched to the desired rotational speed of the electric motor 2. The electric motor 2 drives via a drive shaft 53 to the tool 4, which is formed in the embodiment as a saw blade 54. As shown in FIG. 1, it is optionally provided to arrange a gear 55 and / or a coupling 56 between the electric motor 2 and the tensioning means 3 into which different tools 4 can be inserted.

The invention is not limited to illustrated or described embodiments. Rather, it includes developments of the invention within the scope of the patent claims.

List of reference numbers:

1 handset

2 electric motor

3 clamping devices

4 tool

5 electronic control module

6 first button

7 second button

8 energy providers

9 housing

10 first sensor

11 second sensor

12 housing shell of 9

13 lids of 9

14 battery compartment

15 battery

16 pin contact

17 pin contact

18 pin contact

19 spring of 16

20 spring of 17

21 spring of 18

22 contact area of 8

23 contact area of 8

24 contact area of 8

25 assembly

26 interior of 9

27 inside of 9

28 handle part

29 board

30 electronic component

31 electronic component

32 electrical line

33 connection for 2

34 potting compound 35 adhesive

36 Outside of the housing

37 pestle of 6

38 pestles of 7

39 leadership of 6 40 leadership of 7

41 compression spring of 6

42 compression spring of 7

43 material

44 material

45 proximity sensor

46 Hall sensor

47 magnet in 37 as 43

48 reed sensor

49 magnet in 38 as 44

50 three-phase motor

51 contactless control unit

52 contactless control unit

53 drive shaft

54 saw blade

55 gears

56 clutch

A movement line of 37

B movement line of 38

137 rest position of 37

138 rest position of 38 SE electrical switch ST1 first actuating means ST2 second actuating means

Claims

Claims:

1. A power-driven hand-held device (1), in particular a power-driven surgical hand-held device comprising an electric motor (2), a clamping device (3) driven by the electric motor (2) for fastening a tool (4), such as a drill, a milling cutter or a saw blade ( 54), an electronic control module (5), a first adjusting means (6) and a second adjusting means (7) for controlling the electric motor (2), an energy store (8), such as a rechargeable battery (15) and a housing ( 9), characterized in that the electric motor (2) is designed as a three-phase motor (50), wherein by the electronic control module (5) for the electric motor (2, 50) from the energy store (8) has a three-phase current with an on reaching desired speed tuned frequency can be generated.

2. A power-driven hand-held device (1), in particular a power-driven surgical hand-held device comprising an electric motor (2), a clamping device (3) driven by the electric motor (2) for fastening a tool (4), such as a drill, a milling cutter or a saw blade ( 54), a housing (9), an electronic control module (5), a first adjusting means (6) and a second adjusting means (7) for controlling the electric motor (2), a first sensor (10) and a second sensor (11) for contactless detection of a position (137, 138) of the adjusting means (6, 7) and an energy store (8), such as a rechargeable battery (15), wherein the electronic control module (5) is in communication with the first sensor (10) and the second sensor (11), characterized in that the first sensor (10) through which the position (137) of the The first adjusting means (6) can be detected as a proximity sensor (45), in particular as a Hall sensor (46), wherein signal values of the proximity sensor (45) of the electronic control module (5) are processed and by these signal values, the rotational speed of the electric motor (2) is controllable, wherein the second sensor (11), by which the position (138) of the second actuating means (7) can be detected, as Reed sensor (48) is formed and wherein the Reed sensor (48) forms a switch (SE) through which a power supply from the energy store (8) to the electronic control module (5) and / or from the energy store (8) to the electric motor (2) switched on and / or off.

3. power-driven hand-held device (1) according to claim 1, characterized in that a position (137) of the first actuating means (6) by a proximity sensor (45), in particular a Hall sensor (46) can be detected, wherein signal values of the proximity sensor (45) of the electronic control module (5) can be processed and whereby the rotational speed of the electric motor (2) can be controlled by these signal values, wherein a position (138) of the second actuating means (7) can be detected by a reed sensor (48) and wherein the reed sensor (48) a switch (SE) forms, through which a power supply from the energy store (8) to the electronic control module (5) and / or from the energy store (8) to the electric motor (2) on and / or can be switched off.

4. Power-driven hand tool according to claim 2, characterized in that the electric motor (2) is designed as a three-phase motor (50), wherein by the electronic control module (5) for the electric motor (2, 50) depending on the desired speed from the energy storage ( 8) a three-phase current with a suitable frequency can be generated.

5. Power-driven hand tool according to at least one of the preceding claims, characterized in that between the electric motor (2) and the clamping means (3) a transmission (55) and / or a coupling (56) is arranged.

6. Powered handset according to at least one of the preceding claims, characterized in that the electronic control module (5) comprises a board (29) which carries all the electronic components (30, 31) including the proximity sensor (45) and the Reedsensors (46) and that the electronic control module (5) in particular in a handle part (28) of the housing (9) adjacent to the two adjusting means (6, 7) is arranged.

7. Power-driven hand-held device according to claim 6, characterized in that the electronic control module (5) is cast to protect against contamination and / or against pressure and temperature loads.

8. A power-driven hand-held device according to claim 7, characterized in that the cast-in electronic control module (5) with an inner side (27) of the housing (9) is glued or is cast on an inner side (27) of the housing.

9. Powered hand-held device according to at least one of the preceding claims, characterized in that an inner space (26) of the housing (9) of the handset (1) through the housing (9) against the pressure and temperature loads in a steam pressure sterilization is shielded.

10. Power-driven hand tool according to at least one of the preceding claims, characterized in that the electric motor (2) as an asynchronously operated three-phase motor

(50) is formed.

11. Power-driven hand-held device according to at least one of claims 1 to 9, characterized in that the electric motor (2) is designed as a synchronously operated three-phase motor (50).

12. Power-driven hand-held device according to at least one of the preceding claims, characterized in that the electric motor (2) is designed as a brushless or contactless three-phase motor (50).

13. Powered hand-held device according to at least one of the preceding claims, characterized in that the housing (9) is non-magnetic.

14. Power-driven hand tool according to at least one of the preceding claims, characterized in that the first and the second adjusting means (6, 7) on an outer side (36) of a housing shell (12) of the housing (9) are arranged and that the first and the second sensor (10, 11) in the interior (26) of the housing (9) are arranged, wherein the respective position (137, 138) of the adjusting means (6, 7) of the sensors (10, 11) through the housing shell (12 ) is detectable through.