WO2001090723A1 - Breaking resistance and/or breaking precision test for splittable tablets - Google Patents
Breaking resistance and/or breaking precision test for splittable tablets Download PDFInfo
- Publication number
- WO2001090723A1 WO2001090723A1 PCT/AT2001/000161 AT0100161W WO0190723A1 WO 2001090723 A1 WO2001090723 A1 WO 2001090723A1 AT 0100161 W AT0100161 W AT 0100161W WO 0190723 A1 WO0190723 A1 WO 0190723A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- projection
- tablet
- projections
- split
- top plate
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/40—Investigating hardness or rebound hardness
- G01N3/42—Investigating hardness or rebound hardness by performing impressions under a steady load by indentors, e.g. sphere, pyramid
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/04—Chucks, fixtures, jaws, holders or anvils
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/15—Medicinal preparations ; Physical properties thereof, e.g. dissolubility
Definitions
- the present invention relates to a device for testing the breaking strength and / or breaking accuracy of split tablets.
- Split tablets are tablets that each have a notch on their flat sides so that the cross section of the tablet is reduced at this point. This constriction serves to simplify the breakage of the tablet in the middle, so that it is not necessary to take the entire tablet at once, but if necessary the tablet can be divided as exactly as possible into two equally sized pieces in order to halve the dose.
- the breaking strength should not be too low, so that the tablet breaks into two or more pieces too soon or unintentionally.
- Another related important test which is also carried out only manually, ie subjectively, is the examination of the fracture accuracy, ie how exactly the tablet is broken into two halves of equal size. This test is also important because the break should result in two doses that are as identical as possible. Especially with strong medication, it is unacceptable for the patient to go first too low a dose and too high a dose the next time it is taken. In the event of a break, a maximum tolerance for the breaking accuracy should not be exceeded. This has also been done manually so far, so the measurement of tolerance does not produce repeatable results.
- the aim of the present invention is to provide a device with which the test of breaking strength and breaking accuracy can be carried out objectively and precisely, so that these testing methods are carried out in an identical manner and deliver repeatable results, which eliminates the above disadvantages from the Be cleared away.
- the device according to the invention of the type mentioned at the outset is characterized in that two mutually opposite pressing jaws are provided which each have at least one projection on their end faces facing the opposing pressing jaw, the at least two mutually opposite projections being arranged offset from one another.
- the device should have dimensions so that a commercially available split tablet can be inserted between the two press jaws, a force being exerted on the split tablet by moving the press jaws towards one another, which leads to breakage of the split tablet. It is important that the at least two projections of the pressing jaws are pressed against the split tablet, each from one side and offset from one another, so that forces, for example shear forces or compressive forces, act on the split tablet so that they are in the place of their notch in two pieces of equal size are broken.
- the projections can be shaped differently, for example as a gradation, tooth, ledge etc. It is only important that the split tablets for repeatable results are always provided at the same location between the pressing jaws and the device is calibrated before the tests are carried out. The force with which the pressing jaws are pressed against the split tablet is increased continuously and especially slowly until the split tablet breaks. The force required for this break is registered and, if necessary, statistically evaluated. Since the results are objective and reproducible, there are no errors in the subsequent evaluation of the formulation of the respective tablet batch that if the desired tensile strength is determined, this formulation can be used for the entire batch of tablets without the risk of the batch having to be destroyed due to undesirable fracture properties.
- the fracture accuracy can also be determined objectively, since the respective tablet is always broken in the same way, so that the fracture accuracy depends only on the formulation or the shape of the tablet.
- the procedure for examining the fracture accuracy is the same as for examining the fracture strength, but after the fracture, it is examined at which point of the indentations of the split tablet it was broken.
- a formulation is usually considered optimal if the tablet is broken exactly in the middle of the gap.
- the number of projections can also be varied, it being only important that each pressing jaw has at least one projection on its end face, which is pressed against the gap tablet.
- a split tablet it is possible for a split tablet to have a plurality of notches, so that the break occurs at several points, as a result of which the split tablet is divided into three or more pieces.
- a press jaw preferably has two projections on its end face, which are offset at the same distance from the projection provided on the end face of the opposite press jaw.
- the at least one projection is designed as a strip which runs in a plane which is perpendicular to the direction of movement.
- the strip thus protrudes from the end face of the press jaw, and preferably has a constant height over its entire length. It does not matter in which direction the bar runs in its plane, but it will usually run either in the vertical direction to the direction of movement or in the horizontal direction to the direction of movement.
- the tablet is provided horizontally or perpendicular to the direction of movement between the press jaws, i.e. in a position where the bar engages the gap.
- both press jaws are designed as strips which run parallel to one another.
- the fact that the strips of both press jaws run parallel to one another ensures that the lateral distance between the opposing strips remains the same over the entire length of the strip, and thus the same force is exerted on the split tablet over the entire length of the split tablet.
- the distance between the two projections of a press jaw is advantageously 7 mm to 20 mm, in particular 10 mm.
- This distance is adapted to the dimensions of the tablet to be broken, in particular the length of the split tablet, the distance preferably being provided such that the two projections near the two ends of the split tablet are pressed against the latter.
- the at least one projection has a round cross section.
- the projection is provided as a strip, this can be produced, for example, by applying a wire.
- the projection is to engage in the gap, it is important that corresponding dimensions of the round cross section are provided.
- the round cross section is particularly advantageous if the projection does not engage in the gap in the tablet. Due to the round cross-section, the tablet is not damaged at the point of pressure, so that there is no danger that the pre- Jump into the tablet and the tablet is broken open at an unwanted point.
- the at least one projection preferably has a pointed cross section. This is particularly advantageous for the projection which engages in the gap of the tablet, since this ensures better centering when inserted.
- a particularly advantageous device is characterized in that a support surface for the tablet is provided between the press jaws and runs parallel to the direction of movement.
- the tablet can be placed or placed on this support surface.
- a positioning aid for the tablet can also be provided on the support surface, for example a marking or ridges between which the tablet is inserted. If the tablet is placed on the support surface, the positioning, in particular if the projections are designed as strips, is less delicate since the strips are provided at the height of the gap and run over a certain width of the end face of the pressing jaw, so that the tablet does not necessarily have to be set up at a certain point on the support surface, but can also be provided laterally displaced.
- top plate for a flat pressing jaw of a device for testing the breaking strength and / or breaking accuracy of split tablets, with two pressing jaws which can be moved opposite one another, the top plate having at least one projection.
- the top plate is placed on the press jaw, whereby it can be attached to the press jaw in various ways. The attachment depends in particular on the shape of the top plate. If, for example, the top plate is only provided as a flat plate, this can be attached to the end face of the press jaw, for example, by means of a tongue and groove connection. Another possibility is that the top plate is shaped in such a way that it covers the press jaw both on the front side and on the upper and the two lateral surfaces.
- top plate is “clamped” onto the press jaw.
- the advantage of a top plate is that different top plates for a single device for testing the fracture strength and / or fracture accuracy can be provided, the number, shape, position etc. of the projections of the top plates can be varied so that different types of fracture or different tablet shapes can be tested with a single device.
- the top plate preferably has two projections, the distance between the projections being 5 mm to 20 mm, in particular 10 mm. The distance is chosen depending on the size of the Tab ⁇ lettering.
- the at least one projection is designed as a bar.
- the direction in which the strip runs can vary depending on the type of break desired or the tablet to be broken.
- the at least one projection preferably has a round or pointed cross section, the respective advantages, as already described above, also apply here.
- Another aspect of the present invention relates to a device for testing the breaking strength and / or breaking accuracy of split tablets with two mutually opposite pressing jaws, wherein a top plate according to the invention, as described above, is provided on the pressing jaws, so that the at least two mutually opposite projections are arranged offset from one another.
- a top plate according to the invention as described above, is provided on the pressing jaws, so that the at least two mutually opposite projections are arranged offset from one another.
- Another advantage of this device is that conventional devices can be used to test the hardness of the tablets, only one top plate being applied to the pressing jaws. In this way, a device for testing the breaking strength and / or breaking accuracy is obtained without, however, having to purchase an entire new device.
- a press jaw has a top plate with two projections, which are arranged offset at the same distance from the projection provided on the top plate of the opposite press jaw. It is also advantageous if a support surface for tablets is provided between the top plates attached to the press jaws which is parallel to the direction of movement.
- a further aspect of the present invention relates to a method for testing the breaking strength and / or breaking accuracy of a split tablet, the split tablet between the press jaws of a device according to the invention, as described above, or between the top plates of a device according to the invention attached to the press jaws, as described above , is provided, after which the pressing jaws are moved towards one another and the pressure on the split tablet is continuously increased until the split tablet is broken, the pressure at the time of the break being measured and / or the location of the break of the split tablet being analyzed.
- both the breaking strength and the breaking accuracy of a split tablet are examined in one process. It is usually considered to be optimal if the split tablet is broken at a force of 40-100 N.
- the device is calibrated before the test method is carried out, so that the results can be interpreted without errors and are reproducible.
- the process will be carried out after prototyping of the tablets to be produced, so that the optimal formulation is achieved before the entire batch of tablets is produced. This ensures that a standardized test for " breaking strength and / or breaking accuracy is carried out.
- the at least one projection engages in the gap of the split tablet. This ensures that the tablet is safely broken at the point of the notches without being damaged at any other point. It is important that the size of the projection fits into the gap of the tablet. For this purpose, it is particularly favorable if a device is provided, with top plates with the desired projection size and shape being applied to the levels of the pressing jaws.
- the split tablet is preferably provided on a support surface between the press jaws or top plates, which runs parallel to the movement direction.
- the split tablet can be placed on the support surface or can also be set up, this depending on the position of the projections, in particular if they are designed as strips.
- positioning aids such as markings or elevations can be provided on the support surface.
- FIGS. 4 and 5 show side views of devices, the pressing jaws being provided with top plates in FIG. 5.
- FIG. 1 shows a schematic top view of a device 1 for testing the breaking strength and / or breaking accuracy of a split tablet, the one pressing jaw 2a being provided with a single projection 3a which has a trapezoidal shape.
- the opposing press jaw 2b has two projections 3b with a rectangular cross section.
- a tablet 4 is provided between the pressing jaws 2a, 2b, which is positioned such that when the pressing jaws move towards one another, the projection 3a is pressed into the column of the tablet 4 according to the arrows.
- the projections 3b press against the split tablet in the region of the ends, so that the tablet is split at its notch after application of a certain compressive force. The force at the time of break is measured.
- FIG. 2 shows a schematic top view of a device, the pressing jaws 2a and 2b each having only one projection 3a and 3b, these being designed as gradations. If the pressing jaws 2a, 2b are moved towards one another so that they press onto the tablet (not shown here), shear forces are exerted on the tablet so that it is broken.
- FIG. 3 schematically represents a device corresponding to FIG. 2, the projections 3a and 3b having a round cross section.
- FIG. 4 shows a schematic side view of a device, with the tablet 4 on the support surface 5 is set up.
- the projection 3a of the press jaw 2a has a pointed cross section which engages in the gap of the tablet 4.
- the pressing jaw 2b has two projections 3b, which are designed as steps and are pressed against the gap tablet at their ends when the pressing jaws are moved towards one another in the direction of the arrows.
- FIG. 5 shows a schematic side view of a device, the pressing jaws 2a, 2b being flat and each provided with a top plate 6a, 6b.
- a projection 3a, 3b is provided on this top plate, which is designed as a bar.
- Positioning aids can of course be provided for better positioning of the split tablet, but these are not shown here.
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU59936/01A AU5993601A (en) | 2000-05-23 | 2001-05-22 | Breaking resistance and/or breaking precision test for splittable tablets |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ATA904/2000 | 2000-05-23 | ||
AT9042000 | 2000-05-23 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2001090723A1 true WO2001090723A1 (en) | 2001-11-29 |
Family
ID=3682933
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/AT2001/000161 WO2001090723A1 (en) | 2000-05-23 | 2001-05-22 | Breaking resistance and/or breaking precision test for splittable tablets |
Country Status (2)
Country | Link |
---|---|
AU (1) | AU5993601A (en) |
WO (1) | WO2001090723A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2004069131A1 (en) * | 2003-02-05 | 2004-08-19 | Merckle Gmbh | Method and device for testing the breakability and the breaking accuracy of tablets |
CN109708956A (en) * | 2019-01-17 | 2019-05-03 | 浙江大学 | A kind of positioning device for dynamic splitting test |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2651079A1 (en) * | 1976-11-09 | 1978-05-18 | Focke Pfuhl Verpack Automat | Packing bag assembly made of hot weldable foil - has opening with tear=off closure formed by foil layers joined by non-straight weld seam |
US4409843A (en) * | 1982-03-11 | 1983-10-18 | Hoechst-Roussel Pharmaceuticals Inc. | Device for measuring tablet breaking force |
-
2001
- 2001-05-22 AU AU59936/01A patent/AU5993601A/en not_active Abandoned
- 2001-05-22 WO PCT/AT2001/000161 patent/WO2001090723A1/en active Application Filing
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2651079A1 (en) * | 1976-11-09 | 1978-05-18 | Focke Pfuhl Verpack Automat | Packing bag assembly made of hot weldable foil - has opening with tear=off closure formed by foil layers joined by non-straight weld seam |
US4409843A (en) * | 1982-03-11 | 1983-10-18 | Hoechst-Roussel Pharmaceuticals Inc. | Device for measuring tablet breaking force |
Non-Patent Citations (1)
Title |
---|
KIESEWETTER L ET AL: "AUF BIEGEN UND BRECHEN NEUE VERFAHREN ZUR CHARAKTERISIERUNG DER MECHANISCHEN EIGENSCHAFTENVON IC-MOULDMASSEN", F & M FEINWERKTECHNIK MIKROTECHNIK MIKROELEKTRONIK, CARL HANSER GMBH & CO, DE, vol. 107, no. 4, April 1999 (1999-04-01), pages 68 - 70,72, XP000902737, ISSN: 0944-1018 * |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2004069131A1 (en) * | 2003-02-05 | 2004-08-19 | Merckle Gmbh | Method and device for testing the breakability and the breaking accuracy of tablets |
DE10304688A1 (en) * | 2003-02-05 | 2004-08-26 | Merckle Gmbh | Method and device for testing the divisibility and partial accuracy of tablets |
DE10304688B4 (en) * | 2003-02-05 | 2005-06-23 | Merckle Gmbh | Method and device for testing the divisibility and partial accuracy of tablets |
CN109708956A (en) * | 2019-01-17 | 2019-05-03 | 浙江大学 | A kind of positioning device for dynamic splitting test |
Also Published As
Publication number | Publication date |
---|---|
AU5993601A (en) | 2001-12-03 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP3237877A1 (en) | Device for carrying out a bending test | |
DE3301820C2 (en) | Device for marking the cornea during a surgical operation | |
EP0341211B1 (en) | Method of bending sheet metal | |
EP3541544B1 (en) | Method for operating a bending machine | |
DE1760440C3 (en) | Process for making notched felting needles | |
WO2001090723A1 (en) | Breaking resistance and/or breaking precision test for splittable tablets | |
EP3953164A1 (en) | Method and measuring device for measuring or calibrating utensils in pressing processes | |
AT400803B (en) | CLAMPING DEVICE FOR A DENTAL TOOL | |
EP3155366A1 (en) | Calibration tool for an angle measuring tool in a bending die and method for calibrating the angle measuring tool | |
AT5314U1 (en) | DEVICE FOR TESTING THE BURNING RESISTANCE AND / OR BREAKING ACCURACY OF SPLIT TABLETS | |
DE2462276C3 (en) | Device for measuring the height of an object standing on a surface or for marking out such an object at a predetermined height | |
DE10304688B4 (en) | Method and device for testing the divisibility and partial accuracy of tablets | |
DE3224121C1 (en) | Measuring device | |
AT513901A1 (en) | mounter | |
DE102017130769A1 (en) | measuring roller | |
DE1527422C3 (en) | Workpiece receiving device for a straightening press | |
DE1615025A1 (en) | Clamping tool | |
DE552205C (en) | Method and device for straightening flat iron | |
DE8609058U1 (en) | Two-part mounting base | |
DE2004554A1 (en) | Device for measuring the exact depth of the lingual edge of a bite plate during the manufacture of a dental prosthesis for an edentulous lower jaw, or for checking the accuracy of fit of the lingual edge of a lower jaw prosthesis | |
DE102020133083A1 (en) | Technique for determining the clamping force of a kerf in a backing board | |
DE4336484C1 (en) | Device for preparation of a plaster for a patch test for allergies | |
DE6941682U (en) | DEVICE FOR THICKNESS AND WIDTH MEASUREMENT | |
DE901961C (en) | Device for the marking puncturing of sheet metal | |
DD213131A1 (en) | ORIENTATION DEVICE FOR THREE-DIMENSIONAL BITE MODEL MEASUREMENT |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): AE AG AL AM AT AT AU AZ BA BB BG BR BY BZ CA CH CN CO CR CU CZ CZ DE DE DK DK DM DZ EC EE EE ES FI FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NO NZ PL PT RO RU SD SE SG SI SK SK SL TJ TM TR TT TZ UA UG US UZ VN YU ZA ZW |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): GH GM KE LS MW MZ SD SL SZ TZ UG ZW AM AZ BY KG KZ MD RU TJ TM AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE TR BF BJ CF CG CI CM GA GN GW ML MR NE SN TD TG |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
REG | Reference to national code |
Ref country code: DE Ref legal event code: 8642 |
|
ENP | Entry into the national phase |
Ref country code: AT Ref document number: 2001 9112 Date of ref document: 20011129 Kind code of ref document: A Format of ref document f/p: F |
|
WWE | Wipo information: entry into national phase |
Ref document number: 20019112 Country of ref document: AT |
|
122 | Ep: pct application non-entry in european phase | ||
NENP | Non-entry into the national phase |
Ref country code: JP |