DE102009021421A1 - Pistol-like drive for diaphragm pump of jet lavage utilized by surgeon, has shank with end tiltably fastened to end of magnetizable tappet, and piston tappet adjustably supported and tiltably fastened to another end of shank - Google Patents

Abstract

The drive has a magnetizable tappet (4) partially provided in a central opening of a lifting magnet (3), so that the magnet exerts force on the magnetizable tappet when the current is passed through the magnet. A shank (5) exhibits an end tiltably fastened to an end of the magnetizable tappet. A piston tappet (6) is adjustably supported and tiltably fastened to another end of the shank. An angle (alpha) between the magnetic tappet and the shank, and an angle (beta) between the shank and the piston tappet are selected such that a power gear ratio between the tappets is of specific value. The drive comprises a force outlet area made of plastic. An independent claim is also included for a jet lavage.

Description

The This invention relates to the technical field of jet lavages.

A Jet lavage is a device that a surgeon uses to after invasive bone marrow resection in the preparation of Hip implants or the like after putting the hole remaining detritus gentle, but effective to remove. Clinically, this removal is the cure and the stability the subsequently used prosthesis. The jet lavage Applies a pulsating jet of water through a specially shaped nozzle into the drill channel or otherwise resected resection volume. Mostly at the same time the excess water sucked in a second channel of the nozzle again. For The operation of jet lavage often become external sources of energy used. But there are also embodiments with an integrated power supply such as batteries become.

Technically The jet lavages are often so pronounced that they consist of a drive module and a diaphragm pump. These are initially in a separate packaging. In front The drive module and diaphragm pump are put into operation a bayonet or a matching fit or seal.

Jet lavages are among others from the scriptures US 7,153,287 B2 and US Pat. No. 6,746,419 B1 the company Stryker known.

at The manufacture of disposable items must generally be on favorable production costs, energy efficiency, good Sterilizability and ease of disposal are respected.

It Object of the invention to provide an improved jet lavage.

These Task is solved by the teaching of independent claims solved.

preferred Embodiments of the invention are the subject of the dependent claims.

Advantageous at the drive of a diaphragm pump by a solenoid is that this solution due to the partial reduction the technical simpler and much cheaper solution represents a motor-gearbox combination. cost benefits arise both in the part price and during assembly.

The Use of an additional weight on the axis of the Tappet can be stored in an advantageous manner be used by kinetic energy.

The attachment of additional counterweights ( 63 . 66 ) on the rhombus shoot ( 54 ) can help to minimize vibration as they oscillate in opposite directions.

Advantageous on the use of a solenoid with respect to a motor-gearbox combination is that a solenoid that technically simpler, much cheaper Solution represents and thus to reduce production costs both in terms of parts price and in terms of assembly contributes.

Hereinafter, preferred embodiments of the invention will be explained in more detail with reference to the accompanying drawings. Showing:
In the following, a preferred embodiment of the invention will be explained in more detail with reference to the accompanying drawings. Showing:

1 is a side view of a drive according to the invention for a jet lavage.

2 shows the drive 1 with removed housing shell.

3 shows a bottom view of the drive according to the invention with the housing removed.

4 shows a front view of the drive according to the invention of a jet lavage 1 ,

5 shows another embodiment of the drive according to the invention with the housing removed.

6 shows a diaphragm pump to complement the drive.

1 shows a pistol-shaped drive 1 for a jet lavage. The drive 1 includes a housing 2 with a bayonet 10 on which a diaphragm pump 11 can be attached, the example in 6 is shown.

2 shows the interior of the drive 1 , In the grip of the pistol-shaped drive 1 is a solenoid 3 accommodated. In the upper part of the drive 1 are housed as a source of energy a number of batteries of size AAA, the electrical energy for the solenoid 3 deliver. The solenoid contains a magnetic plunger 4 on which the lifting magnet 3 exerts a force when the solenoid 3 is traversed by electric current.

The force and movement of the plunger 4 is about a thigh 5 on a piston plunger 6 transfer. The axis of the ram 4 and the axis of the thigh 5 include an angle α. The axis of the thigh 5 and the axis of the plunger include an angle β. The angle α has about 50 °, the angle β has about 25 °. In this way, when moving the plunger 4 the piston plunger 6 About half way, but with double force. This gives a translation for the forces F _Hubmagnet : F _piston of about 1: 2, for the amplitudes of the reciprocal. The pestle 4 as well as the piston plunger 6 are mounted in plain bearings, so that their axes do not change when moving in contrast to the angles α and β.

A sinusoidal movement of the plunger 4 is not exactly in a sine movement of the piston plunger 6 translated. The characteristic that arises here corresponds to the properties of a diaphragm pump which requires the greatest force near its top dead center because the water column to be accelerated is then greatest. By choosing other mean angles α and β, another transmission ratio can also be set within certain limits. Also, the transmission characteristic can be adjusted within certain limits to force-displacement characteristics of the components involved.

Also, the pestle 4 be extra heavy or an additional weight on the axis of the plunger 4 which serves to store kinetic energy.

The pestle 4 and the thigh 5 as well as the thigh 5 and the piston plunger 6 can be pivotally connected via joints, hinges or missing material.

3 shows a bottom view of the drive according to the invention with the housing removed.

A solenoid for driving a diaphragm pump 11 can be designed smaller and with lower power, if one of its maximum power otherwise, for example by the in 2 represented translation, can increase. One can accept the larger way, which the ram has to cover in the same time, because its higher speed improves the mutual induction. Thus, in the ideal case, the mechanical-electrical efficiency of the solenoid approach that of an electric motor. This is contrary to the characteristics of a diaphragm pump, which requires a high peak force, but this force can initially be even smaller on the way to the dead center. This characteristic of a diaphragm pump basically already fits well with the characteristic of a solenoid.

In general, a lever mechanism is also suitable for a translation. Its disadvantage, however, is that a lever is always mounted around a pivot point and thus run the points of introduction of force at a fixed lever length on a circular path. This would require that both the plunger 4 as well as the piston plunger 6 must be designed as a wobble piston or the storage of the solenoid must provide a further degree of freedom of movement. Another alternative would be an additional connecting rod. But this represents both extra effort.

4 shows a front view of the drive according to the invention 1 a jet lavage. The drive has a housing or available housing parts which is or are completely sealed to the outside, so that the device inside must not be sterile or sterile. For the application to the patient, a purely external sterilization is sufficient. For this reason, the power outlet area 8th and the force entry area 9 mechanically moveable so as to be movably connected to the surrounding housing but not to have any openings or gaps in the housing sufficiently large for viral or bacterial contamination to pass therethrough. In one embodiment, this is achieved by a production of two plastics in the two-component injection molding process. Another would be the local application of plasticizers or Wandungsverdünnung in the training or entry area of the force, eg. B. by using slides in the plastic production and the expression of a bellows. Another embodiment would be the encapsulation or pressed mechanical version of a workpiece for power dissipation through the surrounding housing.

Behind the force entry area 9 One or more controls are attached. The one or more controls generate an existing signal in the device, which after a time-constant or time-varying calculation rule an assignment between the actuation path or the operating force of the user, ie a command variable, and a manipulated variable z. B. the stroke frequency of the solenoid 3 allowed. The one or more controls can also be referred to as sensors.

One Control element can be a strain gauge on the inside a possibly thinned force entry area is attached, on which the user from outside a force or a change in position made possible by the thinning enter the wall.

The force entry area 9 can allow a transfer of the movement to a component which covers a beam path and thereby the Evaluation of the degree of coverage of a photodiode allowed to determine the desired command value.

The force entry region may allow movement to a component, which subsequently changes an electrical property or magnitude such as resistance, capacitance, inductance, voltage, and / or current that may be used to determine the reference variable. To think here is not only simple electrical components such as resistors, coils or capacitors, but also piezo bending vibrator, crystals with piezoelectric effect or even advantageous thin-film force sensors z. B. according to US 6272 936 ,

Further can be a thermocouple behind a thin-walled area be used. The thermocouple is capable of hand warming of the user through the wall.

In the force entry area 9 It is also possible to use an IR-transmissive plastic, behind which a corresponding detector is located, which detects the occurrence or absence of a radiation component of the incident light, which is caused by the movement of the operating body parts, e.g. As hand or finger, is caused. The incident light may be far infrared generated by body heat. The sensor can also detect the darkening against ambient light. Ambient light can not be darkened by the hand directly, but by an outside attached to the device cover slide, the user operates, are darkened. The cover slider would then be in the germinated area.

Further can a by the housing wall inductively tapped actuator be attached that over the changeable degree the decoupling of a magnetic field works.

Further can be inductively driven by the housing wall Radiation source be attached, the intensity of which from the inside, through the wall permeable to this radiation through, can be detected.

The lifting magnet 3 is driven by an electronic circuit, not shown. The circuit gets its energy from the batteries 7 and is with the batteries and with the lifting magnet 3 electrically connected. The circuit has a microcontroller which stores program code and thus software.

The Software is using the above reference able in the figure to the manipulated variable to change the calculation rule used and to the Adapt users. This can be done by pressing a tender nurse on the control and the housing wall with low power can equally deliver "full pump power" like squeezing a strong man's hand with much greater power. The software is able to learn here.

Of the User can according to the instructions for use a defined action, z. B. "Press for 2 s with the power for which you get full pump power from the device expect to hit the button ". The software uses the effect of this action on the reference variable as a support point for the calculation function the manipulated variable.

The Software can also be the mathematical derivative of the reference variable use for the manipulated variable as soon as this exceeds a certain threshold or below. For example, fast pressing can mean full power, Slow pressing means very gentle pumping.

The Software can detect the degree of ambient lighting and off their proportional coverage the desired value of the manipulated variable determine.

There it should only be necessary, the drive of to sterilize the outside, the drive but for cost reasons inside may be contaminated, the circuit of built-in batteries self-sufficient. When storing the batteries must not much stronger than the already existing self-discharge be charged. Therefore, a Stromsparbauteil is provided, the disabled in a hibernation large parts of the circuit. Immediately before use, the circuit is in a state of use in which all parts, in particular the microprocessor, the Work circuit. To change to the use state is a externally operable by the germ-proof housing means intended.

The Facility may be through a rod of conductive material be formed, which is guided by a ring and in contact, due to mechanical shock, z. B. when removing from the packaging, closes the electrical contact and in this way the required signal to switch to the Use state generated.

The device can also be formed by a sterilized through the housing wall contacting, either mechanically, z. B. by the onset of the pump in the bayonet or vibration or by the force of the operator, or electrically, for. B. by the joint touching a conductor on the pump used, or by magnetic force, for. B. by approach or Ent When a magnetic field is removed from the packaging or when the pump is inserted.

After all the device can also be formed by a contact, not guided by the sterile sealing housing wall is, but is located inside the device.

5 shows another embodiment of the drive according to the invention with the housing removed. Here's the thigh 5 through three more thighs 52 . 53 . 54 added to a rhombus. The rhombus is made of one piece. The attachment points between the legs are made only thinner, so that the attachment points are mechanically elastic bendable. In another embodiment, the legs can also be pivotally connected via joints.

At the two attachment points, which are opposite to the attachment point, where the plunger 4 as well as the piston plunger 6 are fixed, counterweights 63 such as 66 appropriate. The counterweights are also in plain bearings 64 . 65 . 66 and 68 stored so that they can only move along one axis. In 5 are also plain bearings 51 for the pestle 4 as well as sliding bearings 61 and 62 for the piston plunger 6 located. The counterweights ensure a vibration-free or at least low-vibration operation.

In another embodiment, the piston plunger 6 Also be attached to the attachment point, which is opposite to the attachment point at which the plunger 4 is attached. This is particularly useful if it is not a parallelogram, but a real rhombus with no parallel sides. Then there is also a difference between 1: 1 force / displacement ratio between opposite corners.

The angle under which the plunger 4 applied force is introduced into the rhombus, can be selected according to the desired transmission ratio. In particular, it is not necessary that the force in / out takes place along the connecting lines of opposite attachment points of the rhombus.

Between the rhombus and the pestle 4 and / or the rhombus and the piston tappet 6 Another connecting rod can be integrated.

6 shows a diaphragm pump 11 on the bayonet 10 of the drive 1 , is attachable. When fastened, the power outlet area pushes 8th against a membrane 12 the diaphragm pump. The diaphragm pump pumps water or another fluid from an inlet 13 to an applicator port 15 , In the reverse direction, the water or the other liquid on the applicator, the applicator connection and the secretion 14 aspirated.

The The invention was previously based on preferred embodiments explained in more detail. For a professional is however, obviously, that various modifications and modifications can be made without departing from the spirit of the invention. Therefore, the scope of protection is defined by the following claims and set their equivalents.

1

drive

2

casing

3

solenoid

4

tappet

5

leg

6

plunger rod

7

battery

8th

Power outlet region

9

Force entry area

10

bayonet

11

diaphragm pump

12

membrane

13

Intake

14

suction

15

Applikatoranschluss

51 61, 62, 64, 65, 67, 68

bearings

52 53, 54

leg

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• US 7153287 B2 [0004]
• - US 6746419 B1 [0004]
• US 6272936 [0033]

Claims (39)

Drive for the piston plunger for a diaphragm pump with: a lifting magnet ( 3 ); a magnetizable plunger ( 4 ), which partially in a central opening of the solenoid ( 3 ), so that the solenoid on the plunger ( 4 ) exerts a force when current flows through the lifting magnet; a thigh ( 5 ) having a first and a second end, wherein the first end of the leg ( 5 ) pivotally at one end of the plunger ( 4 ) is attached; a piston plunger ( 6 ), which is slidably mounted and pivotally mounted on the second end of the leg ( 5 ) is attached. Drive according to claim 1, characterized in that the angle between the magnetic plunger ( 4 ) and the thigh ( 5 ) and the angle between the leg ( 5 ) and the piston tappet ( 6 ) are selected so that a force transmission ratio between the magnetic plunger ( 4 ) and the piston tappet ( 6 ), which is between 0.25: 1 and 15: 1. Drive according to claim 1, characterized in that the angle between the magnetizable plunger ( 4 ) and the thigh ( 5 ) and the angle between the leg ( 5 ) and the piston tappet ( 6 ) are selected so that a force transmission ratio between the magnetizable plunger ( 4 ) and the piston tappet ( 6 ) of about 1: 2. Drive according to one of the preceding claims, characterized in that the pivotable attachment between the first end of the leg ( 5 ) and the end of the plunger ( 4 ) and / or the pivotal attachment between the piston plunger ( 6 ) and the second end of the thigh ( 5 ) Is realized by an elastically bendable sections. Drive according to one of the preceding claims, further characterized by: three further legs ( 52 . 53 . 54 ), wherein the ends of adjacent legs are pivotally attached to each other and the attachment points form a quadrilateral and are movable along a straight line. Drive according to claim 5, characterized in that at the attachment point, which is opposite to the attachment point, on which the magnetizable plunger ( 4 ), a counterweight is attached. Drive according to claim 5 or 6, characterized in that at the attachment point, which is opposite to the attachment point at which the piston plunger ( 6 ), a counterweight is attached. Drive for the piston plunger for a diaphragm pump with: a lifting magnet ( 3 ); a magnetizable plunger ( 4 ), which partially in a central opening of the solenoid ( 3 ), so that the solenoid on the plunger ( 4 ) exerts a force when current flows through the lifting magnet; four legs ( 5 . 52 . 53 . 54 ), wherein the ends of adjacent legs are pivotally attached to each other and the attachment points form a quadrangle and are movable along a respective straight line, wherein one of the attachment points is mechanically fastened to one end of the magnetizable plunger; a piston plunger ( 6 ) which is slidably mounted and mechanically connected to the attachment point, which is opposite to the attachment point at which the end of the magnetizable plunger ( 4 ) is attached. Drive according to claim 8, characterized in that the length of the legs ( 5 . 52 . 53 . 54 ) and the directions of the straight lines are selected so that a force transmission ratio between the magnetizable plunger ( 4 ) and the piston tappet ( 6 ) of about 1: 2. Drive according to one of the preceding claims, characterized in that the membrane pump in a jet lavage ( 1 ) is installed. Drive according to one of the preceding claims, characterized in that on the ram ( 4 ) an additional weight is attached. Drive according to one of claims 5 to 11, characterized in that the four legs ( 5 . 52 . 53 . 54 ) and the intermediate fastening points are made of one piece, wherein the attachment points are made so thin that they are elastically bendable. Drive according to one of the preceding claims, characterized in that the piston tappet ( 6 ) is not mechanically attached directly to a leg, but indirectly via a first connecting rod. Drive according to one of the preceding claims, characterized in that the magnetizable plunger ( 4 ) is not mechanically attached directly to a leg, but indirectly via a second connecting rod. Jet lavage with: a pump; characterized in that the pump is mechanically connected to a lifting magnet ( 3 ) and by the lifting magnet ( 3 ) is mechanically driven. Jet lavage according to claim 15, characterized in that the jet lavage comprises a transmission stage, which is mechanically connected to the lifting magnet and the pump, wherein the translation stage ( 5 ; 52 . 53 . 54 ) is constructed so that it converts the force supplied by the solenoid into a larger force with a smaller path, and the greater force acts on the pump. Drive for the pump of a jet lavage characterized by a sterile sealed housing ( 2 ). Drive according to claim 17, characterized characterized in that the housing of the drive is made available Housing parts exists. Drive according to one of Claims 17 or 18, characterized by a mechanically movable force exit region for a piston tappet ( 6 ), wherein the force exit region is designed so that it is movably connected to the surrounding housing, but has no openings or gaps to this housing, which would be sufficiently large that it could penetrate viral or bacterial contaminants. Drive according to claim 19, characterized characterized in that the power outlet area of two plastics exists that have been processed in one operation. Drive according to claim 19 or 20, characterized in that the power outlet area contains a higher concentration of plasticizers than the plastic, the rest of the housing ( 2 ) and thus has a higher mobility. Drive according to one of claims 19 to 21, characterized in that the thickness of the plastic in the power outlet region ( 8th ) is less than the thickness of the plastic covering the rest of the housing ( 2 ). Drive according to one of claims 17 to 22, characterized in that the housing ( 2 ) furthermore a force entry area ( 9 ), which is in mechanical contact with an operating element, wherein the force entry region ( 9 ) is designed so that it is movably connected to the surrounding housing, but has no openings or gaps to this housing, which would be sufficiently large that it could penetrate viral or bacterial contaminants. Drive according to claim 23, characterized characterized in that the force entry region of two plastics exists that have been processed in one operation. Drive according to claim 23 or 24, characterized in that the force entry region contains a higher concentration of plasticizers than the plastic containing the remainder of the housing ( 2 ). Drive according to one of claims 23 to 25, characterized in that the thickness of the plastic in the force entry region ( 8th ) is less than the thickness of the plastic that covers the vast majority of the housing ( 2 ). Drive according to one of the claims 23 to 26, characterized in that the drive is an electrical Circuit comprising a sensor and a microprocessor, wherein in which a code is stored in the microprocessor, during its execution from a signal supplied by the sensor according to a calculation rule a manipulated variable is calculated. Drive according to claim 27, characterized characterized in that the sensor is a strain gauge or a Film load cell is located on the inside of the force input area is attached. Drive according to claim 27 or 28, characterized in that a component with the force entry region mechanically connected so that there is a beam path all the more covers, the more the force entry area is deformed, the Sensor a photodiode for measuring the remaining light in the beam path is. Drive according to one of the claims 27 to 29, characterized in that the sensor is an infrared detector to measure the hand heat of the user or the darkening ambient light by the user's hand or one by the user actuated cover slide through the force entry area through, wherein the force input region infrared permeable is. Drive according to one of the claims 27 to 30, characterized in that the sensor is a coil, electrical circuit is constructed and connected to the coil, that the circuit in operation, the decoupling of a magnetic field determined from the coil. Drive according to one of the claims 27 to 31, characterized in that the code is capable of to change the calculation rule in time. Drive according to claim 32, characterized in that the code detects a predefined waveform and the calculation rule to the Adjusts waveform. Drive according to one of the claims 32 or 33, characterized in that the calculation rule the Time derivation of the signal supplied by the sensor during the calculation the manipulated variable taken into account. Electric circuit for a jet lavage with: one Battery; marked by: a power saving component, which has two states, namely an idle state and a use state, wherein the electrical circuit and the component, are dimensioned so that the average current of the Use state by at least two orders of magnitude is higher than the mean current of the resting state. The circuit of claim 35, further characterized by a movable rod made of conductive Material passed through a conductive ring is that the rod and the ring do not touch, though only the gravitational acceleration acts, with the electric Circuit is constructed so and with the rod and with the ring electrically connected is that the power-saving component in the use state changes when the rod and the ring touch. A circuit according to claim 35 or 36, further characterized by two through a housing wall guided contacts, outside the case electrically connectable by jointly touching a conductor are, wherein the electrical circuit is constructed so that the Stromsparbauteil in the use state changes when both contacts are conductively connected. Circuit according to one of the claims 35 to 37, further characterized by a switch which is electrically connected to the circuit, and so on a bayonet on one Housing a drive for a jet lavage attached is that the switch when clicking a diaphragm pump in the Bayonet is actuated, with the electrical circuit is constructed so that the power-saving component in the use state changes when the switch is pressed. Circuit according to one of the claims 35 to 38, further characterized by a coil which is electrically connected to the circuit, wherein the electrical circuit is constructed so that the power-saving component in the use state changes when the voltage induced in the coil exceeds a threshold.