Classifications

• • 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
  • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
• • 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
  • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
  • A61M5/14—Infusion devices, e.g. infusing by gravity; Blood infusion; Accessories therefor
  • A61M5/142—Pressure infusion, e.g. using pumps
  • A61M5/145—Pressure infusion, e.g. using pumps using pressurised reservoirs, e.g. pressurised by means of pistons
• • 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
  • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
  • A61M5/14—Infusion devices, e.g. infusing by gravity; Blood infusion; Accessories therefor
  • A61M5/168—Means for controlling media flow to the body or for metering media to the body, e.g. drip meters, counters ; Monitoring media flow to the body
  • A61M5/16804—Flow controllers

Definitions

• the system is designed to accommodate a local anesthetic cartridge and a variety of needle sizes.
• the drive unit of the system includes a motor and an on-board microprocessor to facilitate control of anesthetic flow.
• the drive unit utilizing the technology described in U.S. Patents Nos. 4,747,824 and 5,180,371 , and incorporated herein by reference, enables delivery of an anesthetic solution at a constant pressure and volume, regardless of variations in tissue resistance.
• the system delivers a minute amount of the anesthetic which precedes the needle during injection in the dental tissue, creating in effect an anesthetic pathway.
• the combination of an anesthetic pathway and controlled pressure and volume (flow rate) results in an effective and pain-free injection.
• the system further incorporates foot pedal 29 is operatively connected to air hose 31 , which in turn is coupled to a pressure sensor 64 located inside unit 13.
• the pressure change from pedal 29 is detected by the sensor 64.
• Sensor 64 then generates a corresponding control signal used to control the flow of the anesthetic solution, in the preferred embodiment, as described in more detail below, when foot pedal 29 is slightly or partially depressed, system 11 operates at a slow speed.
• foot pedal 29 is firmly or fully depressed, system 11 operates at a faster speed.
• the system can be programmed to have multiple rates of flow, not limited to two speeds. While this system operates satisfactorily, some physicians or dentists may not be completely satisfied with it because it requires the pedal to be maintained in a certain position for an extended time period.
• a further objective is to provide a device which reduces the strain on the dentist or other health care practitioner for extended injection sections.
• an injection device constructed in accordance with this invention includes an electrically controlled pump, a handle terminating in a needle through which the medication is ejected and a foot switch or other similar control means (i.e., hand control) used to activate the pump controller.
• the control means may have several positions. In one embodiment, the control means includes three positions: OFF, SPEED 1 and SPEED 2. The pump is off in the off position, at SPEED 1 the medication is administered at a first flow rate, and at SPEED 2 the pain killer is administered at a second, higher flow rate.
• control means may be adapted to have either many discrete positions or could be adjusted continuously between the SPEED 1 and SPEED 2 positions and the flow rate may be changed substantially continuously between an upper and a lower speed limit.
• control means may be spring loaded or otherwise biased, so that when it is SPEED 1 or SPEED 2 position and is then released, it goes to the OFF position automatically.
• the pump controller is provided with several modes of operation.
• the pump controller monitors the position of the control means continuously and operates the pump in a responsive manner so that if the control means is in the SPEED 1 position, the pump is operated at SPEED 1 , in the SPEED 2 position, the pump is operated at SPEED 2 ( and fluid is delivered at a corresponding rate) and if the control means is in the OFF position, the pump motor is turned off, or it goes into an automatic aspiration mode.
• Another mode of operation is a so-called cruise control mode. In this mode of operation the pump controller operates in a manner similar to a cruise control in a car.
• the pump controller when control means is released, the pump controller maintains the previous operation of the pump until a separate control means such as an override switch is activated to change the mode of operation of the pump.
• This separate control means may consist of a separate push button on the handle, on the controller or on the pedal switch. It may also be achieved as currently embodied via software configuration.
• a “window” of time exists in which removal of ones foot from the foot control activates “cruise-control". This "window” may be defined within the software and activated by removal of the foot control.
• the invention is also applicable to other medical and/or dental devices such as ultrasonic sealers, polishing devices, and other rotary and electronic instruments which are operated by a clinician at a controlled rate or speed.
• the invention pertains to an injection device adapted to inject a therapeutic liquid into a patient under the control of a clinician, said device comprising a handle adapted to be held by a clinician for administering the liquid; a pump adapted to selectively deliver the liquid to said handle; a motor adapted to operate said pump at a selected rate in accordance with a control signal; control member operated by the clinician to select said rate, said control member having a first position associated with the selected rate and a second position; and a microprocessor coupled to said control member and adapted to generate said control signal after said control member has been operated and released by the clinician to generate said control signal .
• Fig.1 shows a somewhat schematic representation of an injection device constructed in accordance with this invention
• Fig. 2 shows a block diagram of the device of Fig. 1 ; shows a manual mode of operation of the injection device of FIG. 1 ; and Fig. 3 shows a flow chart showing the operation of the device of Figs.1 and 2 in a manual mode;
• Fig. 2 shows a block diagram of the electrical elements of the device 100.
• the device includes a microprocessor 150 which operates in accordance with programming stored in a memory 152 and control signals received from control switches 106.
• the air hose 116 is connected to a pressure sensor 154 which generates an electrical signal indicative of the position of the foot pedal switch 118.
• the microprocessor provides visual indication and prompts to the operator through indicators 104 and oral indications and prompts through a speaker 156.
• Fig. 2 can be disposed in housing 102.
• the elements, including the motor 158, reservoir 162 and pump 160 may be disposed in handle 110, in which case the tube 108 may be replaced by an electrical connector.
• Device 100 can be operated in several modes. The mode of operation is determined by the position of the knob 106B. For one position of the knob, the device 100 operates in the same manner as the prior injection devices. In this mode the operation of the device 100 can be characterized as a manual or semiautomatic mode in which the device is operated in response to control signals from the clinician. This mode of operation is now described in conjunction with the flow chart of Fig. 3.
• step 200 the device is initialized. This step includes entering various operational parameters into memory 152, loading the reservoir 162 with the appropriate liquid, purging the tube 108, and needle 112, etc.
• a button such as 106B indicating that the start of the operation (step 202).
• step 218 the microprocessor checks if the switch 118 is in the off position. If it is then in step 220 the motor 158 is stopped. In an alternate embodiment, under certain conditions, the motor 158 in step 220 may be reversed for a short time period to induce aspiration. In addition, a separate switch (not shown) may be provided which would cause the motor to reverse. In any event, in the mode shown in Fig. 3, the microprocessor 150 checks the position of the switch 118 and adjusts the operation of the motor 158 accordingly.
• the clinician can use the pedal switch 118 to generate a new control signal for the motor (i.e., speed 1 , speed 2, off , etc.)

Landscapes

• Health & Medical Sciences (AREA)
• Vascular Medicine (AREA)
• Engineering & Computer Science (AREA)
• Anesthesiology (AREA)
• Biomedical Technology (AREA)
• Heart & Thoracic Surgery (AREA)
• Hematology (AREA)
• Life Sciences & Earth Sciences (AREA)
• Animal Behavior & Ethology (AREA)
• General Health & Medical Sciences (AREA)
• Public Health (AREA)
• Veterinary Medicine (AREA)
• Infusion, Injection, And Reservoir Apparatuses (AREA)

Applications Claiming Priority (1)

Publications (2)

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Family Applications (1)

Country Status (3)

Families Citing this family (4)

Citations (1)

• 2001
  • 2001-08-16 CN CNB018236383A patent/CN1273201C/zh not_active Expired - Lifetime
  • 2001-08-16 EP EP01964610A patent/EP1427459A4/en not_active Withdrawn
  • 2001-08-16 CA CA002457110A patent/CA2457110A1/en not_active Abandoned

Patent Citations (1)

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