CA2115824C - Pump for use in medical technology - Google Patents
Pump for use in medical technologyInfo
- Publication number
- CA2115824C CA2115824C CA002115824A CA2115824A CA2115824C CA 2115824 C CA2115824 C CA 2115824C CA 002115824 A CA002115824 A CA 002115824A CA 2115824 A CA2115824 A CA 2115824A CA 2115824 C CA2115824 C CA 2115824C
- Authority
- CA
- Canada
- Prior art keywords
- pump
- current
- driving current
- pump according
- adjustable
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/06—Control using electricity
- F04B49/065—Control using electricity and making use of computers
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M1/00—Suction or pumping devices for medical purposes; Devices for carrying-off, for treatment of, or for carrying-over, body-liquids; Drainage systems
- A61M1/71—Suction drainage systems
- A61M1/74—Suction control
- A61M1/75—Intermittent or pulsating suction
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M1/00—Suction or pumping devices for medical purposes; Devices for carrying-off, for treatment of, or for carrying-over, body-liquids; Drainage systems
- A61M1/04—Artificial pneumothorax apparatus
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M1/00—Suction or pumping devices for medical purposes; Devices for carrying-off, for treatment of, or for carrying-over, body-liquids; Drainage systems
- A61M1/06—Milking pumps
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M1/00—Suction or pumping devices for medical purposes; Devices for carrying-off, for treatment of, or for carrying-over, body-liquids; Drainage systems
- A61M1/06—Milking pumps
- A61M1/069—Means for improving milking yield
- A61M1/0693—Means for improving milking yield with programmable or pre-programmed sucking patterns
Abstract
The pump as described in this invention comprises electronic and mechanical components which allow an individually adjustable operation. For this purpose, this invention provides for components (2,5,8) which periodically transform a driving current for an electrical drive (1). An adjustable clock generator (3) adjusts their transformation frequency. The pumping volume is determined and limited as desired by means of a position detection device (4). As provided for by this invention, the pump also comprises components (7) gor measuring the driving current, which interact with an adjustable current-limiting device (5), thus allowing the pumping pressure of the pump to be adjusted and limited. In a preferred embodiment of this invention, the pump comprises several pump cylinders which are controlled by a position control circuit (8) in such a way that the generated partial vacuum follows a predetermined time characteristic.
Description
2I.~ ~8~~
Code: 533-27112 PdMP fOR U1~E I2T 1~7EDIC1~.L TECE~03~(i7t The subjeot matter of this invention concerns a pump far use in medical technology according to the precharacterizing portion of Patent Claim 1.
This type of pump includes all pumps which can be used in the field of medical technology. Tn particular, these are pumps with which specific bodily secretions can be pumped, such as breast pumps for pumping breast milk, or pumps with which a partial vacuum or an excess pressure necessary for a specific surgiaa~l intervention can be ensured) such as thorax pumps for #;horax operations.
Breast pumps have been known for some time and arc used whomever fihs~ masher is unable or unwilling to nurse the baby directly, such as in eases in Which, for example, the sucking power of the newborn baby is inadequate, as a result of which the milk production may not be sufficiently stimulated, or even in cases in which the sucking power of the baby is adequate, but the mother may not be able to nurse hex baby because of overly sensitive and vulnerable nipples. Many types of physical and psychoXogical disorders can be alleviated or cured with the use of an effective breast pump. For this reason, breast pumps in , many different designs are being widely used in private homes as well as in hospitals. Thus, hand pumps and electrically driven suction apparatuses are presently being used. It is obvious that, depending on the reason for the nursing inability on the part of the mother, one breast pump may be more suitable than another. For example, in cases in which there is a need for ' 211m24 establishing a sucking rhythm and/or a certain sucking power, electrically driven breast pumps are indicated.
One type of electrically driven breast pump has been described, for example, in the European Patent Application EP-A-330,845. With this pump, it is possible to generate a partial vacuum between 1U0 mm Hg and 250 mm Hg with a pumping frequency of 50 to 60 cycles per minute. The partial vacuum generated as well as its characteristics as a function of time are determined by a specially desiqned rotary disk and cannot be changed by the user. Tn many cases, however, it is desirable to manually limit the partial vacuum that is generated by the device.
Thus, the German Patent Specification No. 3,82D,212 describes a suction device for use in medical technology in which the partial vacuum at a specific moment in time is recorded by a pressure sensor and its electrical signal is used to limit the partial vacuum generated. For this purpose, it is proposed that either the sucking rhythm of the pump be i~terruptad as soon as a specific limiting value for the partial vacuum (which can be freely selected or definitely set) has been reached or that the air suction volume of a vacuum pump, the volumetric rate of flow of which can be crianged, be limited as soon as this specific limiting value of the partial vacuum has been reached. Again, this devise cannot be universally used, it is mechanically complicated (servo drive for the pump and circuit for additional valves) and requires a correct, i.e., precise, fitting of the suction cup.
lDuring the surgical treatment of pneumothorExx, a partial vacuum is generated in the cavity which formed between the 21~' i824 thoracic cage and the collapsed pulmonary lobe as a result of the injured pleura so that this pulmonary lobe can be reinflated.
~xring this pxoceduxe, more or less air generally enters this cavity either from the lung or from the thoracic cavity) which causes the generated partial vacuum to collapse. In addition, due to the natural respiratory movement of the patient, the pressure conditions between the pleural membranes are not stable, which interferes with the healing process of the injured pleura.
Therefore, to this day, the partial vacuum required in pneume~thorax treatments is generated by means of communicating pressure~equalizing bottles.
It is therefore the objective of this invention to develop an electrically operated, cost-effective, and safe suction pump for use in medical technology which does not have the disadvaritaqes of the conventionally known deviaot and especially one which makes it possible to individually set the pressure characteristics over time, for example, the sucking power and the sucking rhythm, and which operates safely without requiring a precise fit of the suction cup.
This problem is solved according to this invention by incorporating the characterizing Features of Patent Claim 1 into the suction pump for use in medical technology that was mentioned in the introduction above. Further embodiments and special designs of the pump claimed by this invention will be described in the subordinate patent claims.
The suction pump according to this invention is fitted with a pump drive, the motional cycle of which is not continuous.
According to this invention, the drive used is a drive which F.. .. : .' ' . . . . , ."......~ , :: . ..., . .. : . ~~''% v'~~
'~~.,~ - .
.
i ~
~
:,.
' , r ,. .:. ~ .
, .:
. , . .r . . .' ,.. . .. : ' , ' _.. ' . .
' , .
.,.,..-..~ ... . '. . .. .' .. ..w. . .. ~ :;
. ... , , _. .. ;: . ,~ . .., '.... .,, n, .. .,.,. ,......, ;.
. ' .. ..... , 2~158~4 changes its motional direction as the frequency which can be adjusted changes. To control the mechanical movement of the drive, an electronic circuit is provided. This electronic circuit makes it possible to control the current intensity and especially the current direction or the phase shift of the driving current. Since the force required in the pump cylinder is proportionate to the generated partial vacuum and the force applied in turn is proportionate to the driving current, it is easily possible to limit the partial vacuiun as desired and to regulate the characteristics of the generated partial vacuum as a function of time by controlling the driving current.
Thus, the electronic control circuit claimed by this invention has components, by means of which it is possible to measure the current required by the pump drive. This measured value is fed to a motor current limiter and is subsequently compared to the desired value of a set-point adjuster to limit the maximum partial vacuum. As soon as th~ measured value exceeds the desired value, the current for the pump drive is limited to this desired value.
It is obvious that electromagnets, linear adjusters, direst-current or alternating current motors, etc., may be used to drive the Bump. The movement og the pump, which is to be generated by means of this drive, can be implemented without requiring any furthex inventive steps by means of a lever system, a spindle unit, or a similar system. Depending on the drive used, it necessary to determine the position of the drive element at any given moment in time so as to be able tv define or set the length of the lift of the pump. Also, the circuit according to 2~.~~8~4 s this invention provides for the clock generator to be designed in such a way that it can be adjusted. Thus, it is possible to control the tame characteristic of the paxtial vacuum and the quantity output of the sucked air electronically, which ensures that ally suction curve desired can be generated) zn addition, properties of the drive that might lead to misleading results, such as friction and hysteresis, can be corrected and compensated i~or. The partial vacuum can be determined by measuring the force by means of suitable sensors, such as transverse beams With a wire strain gauge, and it can be subsequently processed in the control circuit.
Helow, this invention will be discussed in greater detail based on the preferred practical examples below which will be explained on the basis of the attached drawings.
Figure 1 shows a basic circuit diagram of the electronic eentrol circuit according to this invention.
Figures 2a and 2b show preferred practical examples of the drive for the pump.
Figure 3 shows a detailed circuit diagram of the electronic control circuit.
The basic circuit diagram that is depicted in Figure Z shows the electronic control czrcuit according to this invention for drive I of the pump cylinder unit. This drive may be designed, far example, in the form of an electric motor or an electromagnet. As provided by this invention, the current supply unit for this drive 1 has a comparator 2 which compares the desired value to the actual value. zn a preferred practical example, this component 2 is controlled by an adjustable cluck ~~~~8~~
generator 3. It ~.s abvious that the switching time far the transformation can be adjusted so as to coincide with the desired position of the pump cylinder unit. This adjustment can be set to a predetermined values however, in an especially preferred practical example) it is implemented by an adjustable position detection device 4, This position detection device 4 determines the suction volume of the pump cylinder unit which is limited by means of a signal generated by component 4. In particular, this signal is fed to components 2, 8, and 5 to periodically transform t~hP driving current cr its phase shift.
To control the suction pressure of the pump, an adjustable current-limiting unit 5 is provided. According to this invention, this current-limiting unit 5 comprises a set-point adjuster 6, the signal of which is compared to an actual value signal which is generated by component 7 for measuring the striving current. The actual measured value of the driving current is directly proporti.4nate to the direction of the rotation of the motor and thus to the suction pressure.
In a further development of the breast pump claimed in this invention, the pump cylinder unit comprises several pump cylinders which are suitably triggered by a position control circuit 8 to generate a uniform suction pressure. In particular, this invention provides for components which determine the positian of the individual pump cylinders. When one of the pump cylinders reaches a preset final position, the position control circuit 8 activates the next pump cylinder.
This position control circuit 8 also defines the point of reversal and, in particular, the zero position for each individual pump cylinder electronically. This is an especially important aspect of this invention since the pump volume of a breast pump, for example, may change during the pumping operation, which can lead to a hysteresis-like trend of the suction pressure. Sy scanning the actual value of the driving current, it is therefore possible to determine the actually applied partial vacuum or the presence of normal pressure in the pump cylinder regardless of the mechanical zero position.
Ydhen several pump cylinders are used, it is also possible to generate a predetermined holding pressure over an extended period of time, which is particularly important during thorax operations. In particular, the described position control circuit a makes it possible to maintain the desired partial vacuum even if a pump cylinder breaks down or if a partial vacuum system springs a leak, thus ensuring the high degree of operational safety that is a prerequisite of pumps that are used in medical technology. Similarly, the upper limit of the maximum suction pressure to be generated can be set by means of the pump according to this invention. In a further development of the pump according to this invention, this upper current limit is rhythmically varied over a predetermined time interval, for example, to stimulate the milk production.
Thus, the pump according to this invention makes it possible for the first tame and at reasonable costs to individually adjust the properties of the pump by means of a simple arrangement, ' i.e., it makes it possible to freely select the F,~ump volume, they pumping time, the pumping rhythm, and the pumping pressure and its characteristics as a function of time.
r Figures 2a and 2h show the mechanical design of two embodiments of the pump as claimed in this invention. Figure 2a shows a housing unit 21 in which at least one electromagnet 22 is located. The core 23 of this electromagnet 22 is connected to lever 25 which is linked to pump Cylinder unit 24. This lever 2a swivels around a pivot 26 which is rigidly connected to the housing. A step pin 27, the position of which can be set mechanically ar electrically, limits the pump volume in a simple manner. The suction pressure desired is directly progortionate to the adjustable driving Current of electromagnet 22.
The embodiment which is de~ictpd in Figure ab chows an electric motor 2~ with a current limner which serves to limit the torque and which ,interacts with lever 25 via suitable gear teeth 29,30. This lever 25 is attached so as to be able to swivel around a pivot 26, which is rigidly connected to the housing, and drives the pump cylinder unit 24. A potentiometer 31 that is attached to pivot 26, which is rigidly connected to the housing, serves to detect the lever position and thus to det~rxnine the pumping volume.
In the circuit diagram shown in Figure 3, the electronic structure og an anaxog control circuit according to this invention is shown in detail and can be easily understood by those skil~,ed in the art. Therefore, there is no need for further explanations.
The control circuit according to this invention may be either a printed analog circuit ar a digital microprocessor circuit.
Code: 533-27112 PdMP fOR U1~E I2T 1~7EDIC1~.L TECE~03~(i7t The subjeot matter of this invention concerns a pump far use in medical technology according to the precharacterizing portion of Patent Claim 1.
This type of pump includes all pumps which can be used in the field of medical technology. Tn particular, these are pumps with which specific bodily secretions can be pumped, such as breast pumps for pumping breast milk, or pumps with which a partial vacuum or an excess pressure necessary for a specific surgiaa~l intervention can be ensured) such as thorax pumps for #;horax operations.
Breast pumps have been known for some time and arc used whomever fihs~ masher is unable or unwilling to nurse the baby directly, such as in eases in Which, for example, the sucking power of the newborn baby is inadequate, as a result of which the milk production may not be sufficiently stimulated, or even in cases in which the sucking power of the baby is adequate, but the mother may not be able to nurse hex baby because of overly sensitive and vulnerable nipples. Many types of physical and psychoXogical disorders can be alleviated or cured with the use of an effective breast pump. For this reason, breast pumps in , many different designs are being widely used in private homes as well as in hospitals. Thus, hand pumps and electrically driven suction apparatuses are presently being used. It is obvious that, depending on the reason for the nursing inability on the part of the mother, one breast pump may be more suitable than another. For example, in cases in which there is a need for ' 211m24 establishing a sucking rhythm and/or a certain sucking power, electrically driven breast pumps are indicated.
One type of electrically driven breast pump has been described, for example, in the European Patent Application EP-A-330,845. With this pump, it is possible to generate a partial vacuum between 1U0 mm Hg and 250 mm Hg with a pumping frequency of 50 to 60 cycles per minute. The partial vacuum generated as well as its characteristics as a function of time are determined by a specially desiqned rotary disk and cannot be changed by the user. Tn many cases, however, it is desirable to manually limit the partial vacuum that is generated by the device.
Thus, the German Patent Specification No. 3,82D,212 describes a suction device for use in medical technology in which the partial vacuum at a specific moment in time is recorded by a pressure sensor and its electrical signal is used to limit the partial vacuum generated. For this purpose, it is proposed that either the sucking rhythm of the pump be i~terruptad as soon as a specific limiting value for the partial vacuum (which can be freely selected or definitely set) has been reached or that the air suction volume of a vacuum pump, the volumetric rate of flow of which can be crianged, be limited as soon as this specific limiting value of the partial vacuum has been reached. Again, this devise cannot be universally used, it is mechanically complicated (servo drive for the pump and circuit for additional valves) and requires a correct, i.e., precise, fitting of the suction cup.
lDuring the surgical treatment of pneumothorExx, a partial vacuum is generated in the cavity which formed between the 21~' i824 thoracic cage and the collapsed pulmonary lobe as a result of the injured pleura so that this pulmonary lobe can be reinflated.
~xring this pxoceduxe, more or less air generally enters this cavity either from the lung or from the thoracic cavity) which causes the generated partial vacuum to collapse. In addition, due to the natural respiratory movement of the patient, the pressure conditions between the pleural membranes are not stable, which interferes with the healing process of the injured pleura.
Therefore, to this day, the partial vacuum required in pneume~thorax treatments is generated by means of communicating pressure~equalizing bottles.
It is therefore the objective of this invention to develop an electrically operated, cost-effective, and safe suction pump for use in medical technology which does not have the disadvaritaqes of the conventionally known deviaot and especially one which makes it possible to individually set the pressure characteristics over time, for example, the sucking power and the sucking rhythm, and which operates safely without requiring a precise fit of the suction cup.
This problem is solved according to this invention by incorporating the characterizing Features of Patent Claim 1 into the suction pump for use in medical technology that was mentioned in the introduction above. Further embodiments and special designs of the pump claimed by this invention will be described in the subordinate patent claims.
The suction pump according to this invention is fitted with a pump drive, the motional cycle of which is not continuous.
According to this invention, the drive used is a drive which F.. .. : .' ' . . . . , ."......~ , :: . ..., . .. : . ~~''% v'~~
'~~.,~ - .
.
i ~
~
:,.
' , r ,. .:. ~ .
, .:
. , . .r . . .' ,.. . .. : ' , ' _.. ' . .
' , .
.,.,..-..~ ... . '. . .. .' .. ..w. . .. ~ :;
. ... , , _. .. ;: . ,~ . .., '.... .,, n, .. .,.,. ,......, ;.
. ' .. ..... , 2~158~4 changes its motional direction as the frequency which can be adjusted changes. To control the mechanical movement of the drive, an electronic circuit is provided. This electronic circuit makes it possible to control the current intensity and especially the current direction or the phase shift of the driving current. Since the force required in the pump cylinder is proportionate to the generated partial vacuum and the force applied in turn is proportionate to the driving current, it is easily possible to limit the partial vacuiun as desired and to regulate the characteristics of the generated partial vacuum as a function of time by controlling the driving current.
Thus, the electronic control circuit claimed by this invention has components, by means of which it is possible to measure the current required by the pump drive. This measured value is fed to a motor current limiter and is subsequently compared to the desired value of a set-point adjuster to limit the maximum partial vacuum. As soon as th~ measured value exceeds the desired value, the current for the pump drive is limited to this desired value.
It is obvious that electromagnets, linear adjusters, direst-current or alternating current motors, etc., may be used to drive the Bump. The movement og the pump, which is to be generated by means of this drive, can be implemented without requiring any furthex inventive steps by means of a lever system, a spindle unit, or a similar system. Depending on the drive used, it necessary to determine the position of the drive element at any given moment in time so as to be able tv define or set the length of the lift of the pump. Also, the circuit according to 2~.~~8~4 s this invention provides for the clock generator to be designed in such a way that it can be adjusted. Thus, it is possible to control the tame characteristic of the paxtial vacuum and the quantity output of the sucked air electronically, which ensures that ally suction curve desired can be generated) zn addition, properties of the drive that might lead to misleading results, such as friction and hysteresis, can be corrected and compensated i~or. The partial vacuum can be determined by measuring the force by means of suitable sensors, such as transverse beams With a wire strain gauge, and it can be subsequently processed in the control circuit.
Helow, this invention will be discussed in greater detail based on the preferred practical examples below which will be explained on the basis of the attached drawings.
Figure 1 shows a basic circuit diagram of the electronic eentrol circuit according to this invention.
Figures 2a and 2b show preferred practical examples of the drive for the pump.
Figure 3 shows a detailed circuit diagram of the electronic control circuit.
The basic circuit diagram that is depicted in Figure Z shows the electronic control czrcuit according to this invention for drive I of the pump cylinder unit. This drive may be designed, far example, in the form of an electric motor or an electromagnet. As provided by this invention, the current supply unit for this drive 1 has a comparator 2 which compares the desired value to the actual value. zn a preferred practical example, this component 2 is controlled by an adjustable cluck ~~~~8~~
generator 3. It ~.s abvious that the switching time far the transformation can be adjusted so as to coincide with the desired position of the pump cylinder unit. This adjustment can be set to a predetermined values however, in an especially preferred practical example) it is implemented by an adjustable position detection device 4, This position detection device 4 determines the suction volume of the pump cylinder unit which is limited by means of a signal generated by component 4. In particular, this signal is fed to components 2, 8, and 5 to periodically transform t~hP driving current cr its phase shift.
To control the suction pressure of the pump, an adjustable current-limiting unit 5 is provided. According to this invention, this current-limiting unit 5 comprises a set-point adjuster 6, the signal of which is compared to an actual value signal which is generated by component 7 for measuring the striving current. The actual measured value of the driving current is directly proporti.4nate to the direction of the rotation of the motor and thus to the suction pressure.
In a further development of the breast pump claimed in this invention, the pump cylinder unit comprises several pump cylinders which are suitably triggered by a position control circuit 8 to generate a uniform suction pressure. In particular, this invention provides for components which determine the positian of the individual pump cylinders. When one of the pump cylinders reaches a preset final position, the position control circuit 8 activates the next pump cylinder.
This position control circuit 8 also defines the point of reversal and, in particular, the zero position for each individual pump cylinder electronically. This is an especially important aspect of this invention since the pump volume of a breast pump, for example, may change during the pumping operation, which can lead to a hysteresis-like trend of the suction pressure. Sy scanning the actual value of the driving current, it is therefore possible to determine the actually applied partial vacuum or the presence of normal pressure in the pump cylinder regardless of the mechanical zero position.
Ydhen several pump cylinders are used, it is also possible to generate a predetermined holding pressure over an extended period of time, which is particularly important during thorax operations. In particular, the described position control circuit a makes it possible to maintain the desired partial vacuum even if a pump cylinder breaks down or if a partial vacuum system springs a leak, thus ensuring the high degree of operational safety that is a prerequisite of pumps that are used in medical technology. Similarly, the upper limit of the maximum suction pressure to be generated can be set by means of the pump according to this invention. In a further development of the pump according to this invention, this upper current limit is rhythmically varied over a predetermined time interval, for example, to stimulate the milk production.
Thus, the pump according to this invention makes it possible for the first tame and at reasonable costs to individually adjust the properties of the pump by means of a simple arrangement, ' i.e., it makes it possible to freely select the F,~ump volume, they pumping time, the pumping rhythm, and the pumping pressure and its characteristics as a function of time.
r Figures 2a and 2h show the mechanical design of two embodiments of the pump as claimed in this invention. Figure 2a shows a housing unit 21 in which at least one electromagnet 22 is located. The core 23 of this electromagnet 22 is connected to lever 25 which is linked to pump Cylinder unit 24. This lever 2a swivels around a pivot 26 which is rigidly connected to the housing. A step pin 27, the position of which can be set mechanically ar electrically, limits the pump volume in a simple manner. The suction pressure desired is directly progortionate to the adjustable driving Current of electromagnet 22.
The embodiment which is de~ictpd in Figure ab chows an electric motor 2~ with a current limner which serves to limit the torque and which ,interacts with lever 25 via suitable gear teeth 29,30. This lever 25 is attached so as to be able to swivel around a pivot 26, which is rigidly connected to the housing, and drives the pump cylinder unit 24. A potentiometer 31 that is attached to pivot 26, which is rigidly connected to the housing, serves to detect the lever position and thus to det~rxnine the pumping volume.
In the circuit diagram shown in Figure 3, the electronic structure og an anaxog control circuit according to this invention is shown in detail and can be easily understood by those skil~,ed in the art. Therefore, there is no need for further explanations.
The control circuit according to this invention may be either a printed analog circuit ar a digital microprocessor circuit.
Claims (9)
1. Pump for use in medical technology comprising at least one pump cylinder unit (24), an electrical drive (1) for said unit, a current supply unit for generating a driving current for said electrical drive (1) and an adjustable current-limiting device (5), characterized in that means (2, 8, 5) are provided to regulate and to periodically transform the driving current, said means including a controlled current set-point adjuster (2, 5, 8).
2. Pump according to claim 1, characterized in that said means for periodically transforming the driving current include an adjustable clock generator (3).
3. Pump according to claim 2, characterized in that means (7) are provided for measuring the driving current.
4. Pump according to claim 3, characterized in that the means (7) for measuring the driving current are connected to said adjustable current limiting device (5) for the electrical drive (1), so as to be able to feed an electrical signal that is generated by said means (7) as an actual value to said current limiting device (5).
5. Pump according to claim 4, characterized in that means (4) for detecting a mechanical position of the pump cylinder unit are provided, said means (4) generating an electrical signal and being connected to the means (2, 5, 8) for periodically transforming the driving current.
6. Pump according to claim 4, characterized in that said pump comprises a position control circuit (8), by means of which several pump cylinders can be triggered according to a predetermined manner/pattern (???)
7. Pump according to claim 1, characterized in that said pump comprises a microprocessor for controlling the driving current.
8. Pump according to claim 1, characterized in that said pump is formed as a breast pump.
9. Pump according to claim 1, characterized in that said pump is formed as a thorax pump.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH533/93A CH685676A5 (en) | 1993-02-19 | 1993-02-19 | Medical technology pump. |
| CH00533/93-8 | 1993-02-19 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2115824A1 CA2115824A1 (en) | 1994-08-20 |
| CA2115824C true CA2115824C (en) | 1999-08-10 |
Family
ID=4189202
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002115824A Expired - Fee Related CA2115824C (en) | 1993-02-19 | 1994-02-16 | Pump for use in medical technology |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP0611578B1 (en) |
| JP (1) | JPH06292719A (en) |
| CA (1) | CA2115824C (en) |
| CH (1) | CH685676A5 (en) |
| DE (1) | DE59404908D1 (en) |
| DK (1) | DK0611578T3 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8079975B2 (en) | 2004-04-30 | 2011-12-20 | The First Years Inc. | Pump apparatus |
| US8398584B2 (en) | 2009-01-16 | 2013-03-19 | Learning Curve Brands, Inc. | Breast pump and method of use |
| US8591458B2 (en) | 2002-04-30 | 2013-11-26 | Tomy International, Inc. | Pumping breast milk |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6090065A (en) * | 1998-07-06 | 2000-07-18 | Evenflo Company, Inc. | Self-cycling breast pump |
| US6673036B1 (en) | 1999-10-13 | 2004-01-06 | The First Years Inc. | Pumping breast milk |
| EP2349378A4 (en) | 2008-11-07 | 2013-12-18 | Simplisse Inc | Breast pump |
| DE102010019041A1 (en) * | 2010-05-03 | 2011-11-03 | Mapa Gmbh | Electric breastmilk pump |
| TW202035873A (en) * | 2019-03-29 | 2020-10-01 | 亞台富士精機股份有限公司 | Control method and vacuum system |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5007899A (en) * | 1988-02-29 | 1991-04-16 | Isg/Ag | Drive unit adapted for use with manual piston pump |
| DE3820211A1 (en) * | 1988-06-14 | 1988-11-10 | Walter Nicolai | Method and device for limiting the reduced pressure of an aspirator working with an aspiration phase and a venting phase |
| FR2647981B1 (en) * | 1989-05-30 | 1991-08-16 | Thomson Tubes Electroniques | DRIVE DEVICE FOR ELECTROMAGNETIC ACTUATOR |
| DE4031708C2 (en) * | 1990-10-06 | 1996-05-15 | Telefunken Microelectron | Method for differential pressure control of a pump system driven by a single-phase capacitor motor and circuit arrangement for carrying out the method |
-
1993
- 1993-02-19 CH CH533/93A patent/CH685676A5/en not_active IP Right Cessation
-
1994
- 1994-01-24 DK DK94100957T patent/DK0611578T3/en active
- 1994-01-24 EP EP94100957A patent/EP0611578B1/en not_active Expired - Lifetime
- 1994-01-24 DE DE59404908T patent/DE59404908D1/en not_active Expired - Fee Related
- 1994-02-16 CA CA002115824A patent/CA2115824C/en not_active Expired - Fee Related
- 1994-02-21 JP JP6022506A patent/JPH06292719A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8591458B2 (en) | 2002-04-30 | 2013-11-26 | Tomy International, Inc. | Pumping breast milk |
| US8079975B2 (en) | 2004-04-30 | 2011-12-20 | The First Years Inc. | Pump apparatus |
| US8398584B2 (en) | 2009-01-16 | 2013-03-19 | Learning Curve Brands, Inc. | Breast pump and method of use |
| US8900182B2 (en) | 2009-01-16 | 2014-12-02 | Tomy International, Inc. | Breast pump and method of use |
Also Published As
| Publication number | Publication date |
|---|---|
| DE59404908D1 (en) | 1998-02-12 |
| DK0611578T3 (en) | 1998-09-07 |
| JPH06292719A (en) | 1994-10-21 |
| EP0611578B1 (en) | 1998-01-07 |
| EP0611578A1 (en) | 1994-08-24 |
| CA2115824A1 (en) | 1994-08-20 |
| CH685676A5 (en) | 1995-09-15 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |