Device for determining the dissolution time of medicaments in pressed form, like tablets, pills or capsules

• US 6,163,149 A
• Filed: 04/06/1998
• Issued: 12/19/2000
• Est. Priority Date: 10/06/1995
• Status: Expired due to Term

• Current Assignee: Hans-Peter Loffler
• Original Assignee: Hans-Peter Loffler
• Inventors: Loffler, Hans-Peter
• Primary Examiner(s): NOLAND, THOMAS
• Application Number:
  US09/051,575
• Time in Patent Office: 988 Days
• Field of Search: 324/232, 324/236, 73/866
• US Class Current: 324/232
• CPC Class Codes: G01N 13/00 Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects scanning-probe techniques or apparatus G01Q
• CPC Class Codes: G01N 2013/006 Dissolution of tablets or the like
• CPC Class Codes: G01N 2035/00198 Dissolution analysers
• CPC Class Codes: G01N 33/15 Medicinal preparations ; Physical properties thereof, e.g. dissolubility drug screening with animal cells G01N33/5008

Abstract

The invention relates to a device for determining the dissolution time of medication in pressed form, like tablets and capsules, (especially to DAB 10, 3rd Supplement 1994, or the European Pharmacopoeia or USP [USA]), consisting of a frame (1) with a central column (7) and a base plate (3, 10) having a plurality of holes (5, 5'"'"', 11) covered from below by a mesh (4). Test tubes (6, 6'"'"') are arranged upright in said holes inside the frame (1). A disk (8, 15) can be movably inserted into said test tubes to weight the individual pressed medication. An electric coil (12) is disposed around each hole (11) and on and/or in the base plate (10), wherein the electric coil forms part of an electrical oscillation circuit (17). A conductor loop (16) is disposed on and/or in the disk (15) for damping the electrical oscillation circuit (17) depending on distance. The electric coil (12) and the conductor loop (16) together are connected to an electric supply and evaluation device (20, 23) to generate oscillations and evaluate the measurement results.

Claims

1. A device for determining the dissolution time of medications in pressed form comprising

a frame;

a center column furnished at the frame;

a base plate furnished at the frame, wherein the base plate is furnished with a plurality of holes;

a mesh covering the holes from below,

test tubes placed upright in the holes and located within the frame,

a plurality of disks, with each of the disks insertable into each one of the test tubes for loading and weighting the individual medications,

a plurality of electric coils, with each one of the electric coils disposed around a corresponding one of the holes,

wherein each electric coil forms part of one of a plurality of electrical oscillation circuits,

a plurality of conductor loops, with each conductor loop disposed near a corresponding one of the plurality of disks for path-dependently damping the electrical oscillation circuits, wherein each electric coil and each conductor loop are connected to an electric power supply to generate oscillations and to an evaluation device for evaluating measurement results.

2. The device according to claim 1, wherein each one of the plurality of electric coils is formed as a single-layer coil.

3. The device according to claim 1, wherein each one of the plurality of electric coils is formed as a multi-layer coil.

4. The device according to claim 1, further comprising

a coil support, wherein each electric coil is a flat coil having windings, wherein a first half of the windings of the flat coil are integrated into an upper side and a second half into a bottom side of the coil support, and wherein feed lines to the electric coils are formed congruent relative to the upper side and the bottom side of the coil support.

5. The device according to claim 1, further comprising

a coil support, wherein each electric coil is a flat coil having windings, wherein a first half of the windings of the flat coil are integrated into an upper side and a second half into a bottom side of the base plate of the frame, and wherein feed lines to the electric coils are formed congruent relative to the upper side and the bottom side of the base plate.

6. The device according to claim 1, further comprising

a multi-layer plate, wherein the electric coils are disposed in multi-layer technique on the multi-layer plate.

7. The device according to claim 1, wherein the electric coils are disposed separated from the base plate of the frame.

8. The device according to claim 1, further comprising

a multiplexer connected to the electrical oscillation circuits, wherein the electrical oscillation circuits are controllable with the multiplexer.

9. The device according to claim 1, further comprising

a drive unit;

a source of a magnetic field disposed between the frame and the drive unit, wherein an energy supply and a data transfer is performed contactless by means of a magnetic field between the frame and a drive unit, wherein the frame is supported with the center column disposed within the drive unit.

10. The device according to claim 9, further comprising

a plurality of pot cores, wherein an electric coupling path is in each case comprised of one half of a corresponding one of the plurality of pot cores having a respective electric coil inserted on each side, wherein a first pot-core half with electric coil disposed on a driving side is integrated into a support for the center column, and on a side of the frame a second pot-core half with electric coil is integrated into the center column.

11. The device according to claim 9, further comprising

a plurality of pot cores, wherein an electric coupling path is in each case comprised of one half of a corresponding one of the plurality of pot cores;

having a respective electric coil inserted on each side, wherein a first pot-core half with electric coil disposed on a driving side is integrated into a support for the frame, and on a side of the frame a second pot-core half with electric coil is integrated into the center column.

12. The device according to claim 1, further comprising

a common bus;

a plurality of frames each comprised of an oscillation circuit, an evaluation device, and an inductive energy coupling and a data coupling, are switched to the common bus and receive a bus address, and wherein a transport address is inserted into a message to be delivered for a parallel operation of the frames at the common bus.

13. The device according to claim 1, further comprising

a common bus;

a plurality of sensors each comprised of an oscillation circuit, an evaluation device, and an inductive energy coupling and a data coupling, are switched to the common bus and receive a bus address, and wherein a transport address is inserted into a message to be delivered for a parallel operation of the sensors at the common bus.

14. The device according to claim 13, wherein each oscillation circuit includes a transmitter coil and a receiver coil, wherein the transmitter coils and the receiver coils of the sensors for coupling to a driving side of the frames are operated with differing frequencies for a separation of an energy flow and a data flow.

15. A method for determining the dissolution time of medication in pressed form comprising

connecting a plurality of electric coils and a plurality of conductor loops to an electric power supply;

placing a medication in pressed form into each one of a plurality of test tubes, wherein the test tubes are located in a frame, wherein a center column is furnished at the frame, and wherein a base plate is furnished at the frame, wherein the base plate is furnished with a plurality of holes, wherein a mesh is covering the holes from below, and wherein the test tubes are placed upright in the holes and located within the frame;

inserting each one of a plurality of disks into each one of the test tubes for loading and weighting the individual medications;

energizing the plurality of electric coils, wherein each one of the electric coils is disposed around a corresponding one of the holes, and wherein each electric coil forms part of an electrical oscillation circuit;

damping the electrical oscillation circuit with a plurality of conductor loops, wherein each conductor loop is disposed on a corresponding one of the plurality of disks for path-dependently damping the electrical oscillation circuit;

generating oscillations in each electric coil and in each conductor loop with power furnished by the electric power supply;

feeding the oscillations to an evaluation device for evaluating the measurement of the dissolution time of the medication.

16. A method for determining the dissolution time of medication in pressed form comprising

connecting a plurality of electric coils and a plurality of conductor loops to an electric power supply;

placing a medication in pressed form into each one of a plurality of test tubes, wherein the test tubes are located in a frame, wherein a center column is furnished at the frame, and wherein a base plate is furnished at the frame, wherein the base plate is furnished with a plurality of holes, wherein a mesh is covering the holes from below, and wherein the test tubes are placed upright in the holes and located within the frame;

inserting each one of a plurality of disks into each one of the test tubes for loading and weighting the individual medications;

energizing the plurality of electric coils, wherein each one of the electric coils is disposed around a corresponding one in the base plate, and wherein each electric coil forms part of an electrical oscillation circuit;

damping the electrical oscillation circuit with a plurality of conductor loops, wherein each conductor loop is disposed on a corresponding one of the plurality of disks for path-dependently damping the electrical oscillation circuit;

generating oscillations in each electric coil and in each conductor loop with power furnished by the electric power supply;

feeding the oscillations to an evaluation device for evaluating the measurement of the dissolution time of the medication.

17. A method for determining the dissolution time of medication in pressed form comprising

connecting a plurality of electric coils and a plurality of conductor loops to an electric power supply;

placing a medication in pressed form into each one of a plurality of test tubes, wherein the test tubes are located in a frame, wherein a center column is furnished at the frame, and wherein a base plate is furnished at the frame, wherein the base plate is furnished with a plurality of holes, wherein a mesh is covering the holes from below, and wherein the test tubes are placed upright in the holes and located within the frame;

inserting each one of a plurality of disks into each one of the test tubes for loading and weighting the individual medications;

energizing the plurality of electric coils, wherein each one of the electric coils is disposed around a corresponding in the base plate, and wherein each electric coil forms part of an electrical oscillation circuit;

damping the electrical oscillation circuit with a plurality of conductor loops, wherein each conductor loop is disposed in a corresponding one of the plurality of disks for path-dependently damping the electrical oscillation circuit;

generating oscillations in each electric coil and in each conductor loop with power furnished by the electric power supply;

feeding the oscillations to an evaluation device for evaluating the measurement of the dissolution time of the medication.

18. A method for determining the dissolution time of medication in pressed form comprising

connecting a plurality of electric coils and a plurality of conductor loops to an electric power supply;

placing a medication in pressed form into each one of a plurality of test tubes, wherein the test tubes are located in a frame, wherein a center column is furnished at the frame, and wherein a base plate is furnished at the frame, wherein the base plate is furnished with a plurality of holes, wherein a mesh is covering the holes from below, and wherein the test tubes are placed upright in the holes and located within the frame;

inserting each one of a plurality of disks into each one of the test tubes for loading and weighting the individual medications;

energizing the plurality of electric coils, wherein each one of the electric coils is disposed around a corresponding one of the holes, and wherein each electric coil forms part of an electrical oscillation circuit;

damping the electrical oscillation circuit with a plurality of conductor loops, wherein each conductor loop is disposed in a corresponding one of the plurality of disks for path-dependently damping the electrical oscillation circuit;

generating oscillations in each electric coil and in each conductor loop with power furnished by the electric power supply;

feeding the oscillations to an evaluation device for evaluating the measurement of the dissolution time of the medication.