Classifications

• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
  • A61B17/00—Surgical instruments, devices or methods
  • A61B17/32—Surgical cutting instruments
  • A61B17/3203—Fluid jet cutting instruments
• • 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
  • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
  • F04B1/02—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having two cylinders
• • 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
  • F04B49/02—Stopping, starting, unloading or idling control
  • F04B49/03—Stopping, starting, unloading or idling control by means of valves
  • F04B49/035—Bypassing
• • 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
  • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
  • F04B53/007—Cylinder heads

Definitions

• the invention relates to a medical pump, in particular for Wassetsttahl- surgery.
• Det invention is based on the object to show a medical pump in particular for the Wassersttahlchiturgie, which despite improved and therefore suitable for single-use design allows improved cutting performance.
• This object is achieved by a medical pump in particular for the Wassersttahl ⁇ chiturgie Ansptuch 1.
• This pump includes at least two pistons with piston rods for moving the
• valve devices and / or the pressure regulating valve comprise an elastic or elastically acted upon valve membrane. This ensures a very cost-effective manufacturability with high reliability.
• valve means may comprise two spring-loaded ball check valves, which are also produced in a simple manner.
• the pressure regulating valve is preferably designed as a force-controlled valve such that the maximum value can be set by an actuating force acting on an actuator of the pressure regulating valve.
• This special design makes it possible in an advantageous manner very simply to couple the medical pump to the pump actuating device, wherein a particularly accurate spatial positioning of the pump for the pump actuating device is not necessary.
• an actuator does not depend on its position when the pressure regulating valve is coupled to an actuator (which would require a precise adjustment of the pump to the pump actuating device), but much more the position-independent force with which the Einstell ⁇ organ actuates the pressure control valve.
• the pressure regulating valve is arranged between the fluid inlet and the fluid outlet such that when the maximum value is exceeded, fluid can be returned from the fluid outlet to the fluid inlet. In this way, it is possible to set the pressure independently of the delivery rate.
• the pistons or the piston rods are preferably connected via a bellows, a Rollmemb ⁇ ran or the like sliding seal with the cylinders tight and impermeable to germs.
• a bellows, a Rollmemb ⁇ ran or the like sliding seal with the cylinders tight and impermeable to germs.
• valve devices and / or the pressure regulating valve are mounted in the cylinder head. This results in a simple structure consisting of a few individual pieces.
• the cylinders are preferably individually connectable to the cylinder head. This facilitates manufacturability.
• the outlet has connection means for irreversibly connecting to a pressure hose. This can help to prevent incorrect installation of the pump and unauthorized reuse of the pump.
• the cylinder head preferably has holding devices, in particular retaining projections for latching holding pawls, which are attached to the pump actuating device. There are thus no separate measures necessary to mount the pump on the pump actuator.
• a pressure storage device is provided and formed and connected to the fluid outlet, that pressure fluctuations of the fluid at the fluid outlet are compensated in the manner of a Tiefpas sfunktion. This results in a further homogenization of the cutting jet and thus a Improvement of the targeted here. Cutting function of the device.
• the Druck Profein ⁇ directions are preferably arranged in the cylinder head or connected to this, which facilitates the construction of the overall arrangement.
• FIGS. 1-3 are schematic block diagrams of embodiments of the medical pump
• FIG. 4 is an exploded perspective view of an imple mentation form of
• FIG. 5 shows a side view of the pump according to FIG. 4,
• FIG. 6 shows a section along the line VI-VI from FIG. 5,
• - Fig. 7 and 8 is a partial section through the medical pump in the region of the pressure control valve in various control positions and
• FIG. 9 is a perspective view of the cylinder head.
• a pump actuation device 10 which comprises a motor control 15 for controlling two motors 11, 11 ', which have transmissions 12, 12' and coupling devices 13, 13 'with piston rods 25 , 25 'are connected.
• An operator B can control the engine control 15 by means of suitable switching devices (foot switch, finger switch) such that the motors 11, 11 'via the chain described the piston rods 25, 25' and thus pistons 22, 22 'in cylinders 21, 21 'of a pump unit 20 move ver ⁇ alternately, so that pressure chambers 16, 16' of the pump unit 20 alternately increased in size and reduced in size.
• Suction valves 26, 26 'and pressure valves 27, 27' are connected to the pressure chambers 16, 16 '.
• the pump unit 20 forms together with the reservoir 9 together with its contents, the
• a clamping valve 14 is provided, via which (in addition to the motor control 15) an adjustment of the fluid flow by the operator B can take place.
• FIG. 2 differs from that according to FIG. 1 in that a pressure control valve 35 is provided which can open and close a connection channel between the fluid outlet 7 and the fluid inlet 6 by means of a valve diaphragm 36.
• the membrane 36 is actuated via a push rod 34 and a spring 33 and a force meter 31 by a servomotor 30.
• the dynamometer 31 delivers a force-proportional output signal to a controller 32, via which an operator B can specify a maximum pressure.
• a separate force meter 31 it is also possible to measure an actuating current of the servomotor 30, which is likewise proportional to the force.
• a pressure accumulator 40 which comprises a cylinder 44 and in this a piston 42 which is sealed by a seal 43 and is acted on by a spring 41.
• the space above the piston is connected to the fluid outlet, so that the spring 41 is compressed when the pressure at the fluid outlet 7 increases, while the spring 41 drives the piston 42 when the pressure drops. In this way, a homogenization of the applied pressure to the applicator 8 is achieved in the manner of a low-pass function.
• This pressure accumulator 40 is arranged in a cylinder head 29 which closes off the cylinders 21, 21 '.
• FIG. 4 shows a constructive embodiment of the pumping device 20 in a perspective exploded view.
• the pressure and suction valves 26/27 comprise balls 19, which are pressed via springs 18 onto valve seats (not visible in the illustration), as is known in principle.
• the cylinder head 29 has two sections for coupling the cylinders 21, 21 ', where the valves are seated between the cylinders 21, 21' and the cylinder head 29.
• piston rods 25, 25 ' have coupling projections 17, 17' at their distal ends, via which a mechanical connection with the coupling systems 13, 13 'is accomplished.
• the pistons are in this embodiment de * invention du ⁇ ch proximal ends of the piston rods 25, 25 'formed with attached caps 28, which at the same time keep the seals 23, 23' firmly on the piston rods 25, 25 '.
• the pressure hose 5 is on the cylinder head 29 via a union clip 37, a crimping tube 38 and inserted into the pressure hose 5 inner tube irreversibly attached, being held together by a mating (in a conventional manner) the union neck 37 in the cylinder head 29 by means of a snap tongue 45 that irreversibly holds the union neck 37 in the cylinder head 29.
• FIGS. 5 and 6 Details of the arrangement, in particular with respect to the construction of the suction valve 26, 26 'or of the pressure valve 27, 27' can be seen in FIGS. 5 and 6, in particular the arrangement of the valve seats on the one hand in the cylinder head 29 and on the other hand in the respective ones associated cylinders 21, 21 '.
• FIGS. 7 and 8 a section through the pressure regulating valve 35 is shown, from which it can be seen that the membrane 36 can be pressed by the push rod 34 onto a valve seat (FIG. 7 shows the opened, FIG. 8 the closed state), so that between the Fluid outlet 7 and the fluid inlet 6, depending on the position of the membrane 36, generates a more or less "short circuit" of the pump unit 20. Since the membrane 36 is acted upon by the pressure in the fluid outlet 7, a force-controlled valve is present.
• FIG. 4 shows further constructive details of the cylinder head 29 and the valve devices (suction valve, pressure valve and pressure control valve) contained therein.
• retaining projections 46 are shown in FIG. 9, via which the pump unit 20 can be coupled to the pump actuating device 10 or held firmly on it.
• the pressure regulating valve 35 designed as a diaphragm valve, but also the two pressure valves 27, 27 'or suction valves 26, 26' are designed as diaphragm valves instead of the ball valves shown here. This makes the arrangement even more cost effective. Finally, it is also possible to make the arrangement in such a way that not only all valves as mem- Instead, all diaphragms can be connected to one another in one piece, so that the number of parts continues to drop.

Landscapes

• Engineering & Computer Science (AREA)
• Health & Medical Sciences (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Surgery (AREA)
• Life Sciences & Earth Sciences (AREA)
• Molecular Biology (AREA)
• Medical Informatics (AREA)
• Heart & Thoracic Surgery (AREA)
• Animal Behavior & Ethology (AREA)
• General Health & Medical Sciences (AREA)
• Public Health (AREA)
• Veterinary Medicine (AREA)
• Biomedical Technology (AREA)
• Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
• Details Of Reciprocating Pumps (AREA)
• Reciprocating Pumps (AREA)

Priority Applications (4)

Applications Claiming Priority (2)

Publications (2)

Family

ID=34979089

Family Applications (1)

Country Status (7)

Cited By (4)

Families Citing this family (46)

Citations (5)

Family Cites Families (39)

• 2004
  • 2004-06-30 DE DE102004031673A patent/DE102004031673B4/de not_active Expired - Fee Related
• 2005
  • 2005-06-22 JP JP2007518508A patent/JP4925213B2/ja not_active Expired - Fee Related
  • 2005-06-22 AU AU2005259594A patent/AU2005259594B2/en not_active Ceased
  • 2005-06-22 US US11/630,613 patent/US20090060764A1/en not_active Abandoned
  • 2005-06-22 WO PCT/EP2005/006755 patent/WO2006002817A1/de not_active Ceased
  • 2005-06-22 EP EP05761607.0A patent/EP1768580B1/de not_active Expired - Lifetime
  • 2005-06-22 CN CNB2005800222913A patent/CN100534395C/zh not_active Expired - Fee Related

Patent Citations (5)

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