CA1069790A - Permanent magnet device for implantation - Google Patents
Permanent magnet device for implantationInfo
- Publication number
- CA1069790A CA1069790A CA264,426A CA264426A CA1069790A CA 1069790 A CA1069790 A CA 1069790A CA 264426 A CA264426 A CA 264426A CA 1069790 A CA1069790 A CA 1069790A
- Authority
- CA
- Canada
- Prior art keywords
- permanent magnet
- magnet device
- enveloping body
- tissue
- bodies
- 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
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F7/00—Magnets
- H01F7/02—Permanent magnets [PM]
- H01F7/0205—Magnetic circuits with PM in general
- H01F7/0221—Mounting means for PM, supporting, coating, encapsulating PM
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F9/00—Methods or devices for treatment of the eyes; Devices for putting-in contact lenses; Devices to correct squinting; Apparatus to guide the blind; Protective devices for the eyes, carried on the body or in the hand
- A61F9/007—Methods or devices for eye surgery
- A61F9/00718—Restoration of lid function
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2210/00—Particular material properties of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2210/009—Particular material properties of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof magnetic
Abstract
ABSTRACT OF THE DISCLOSURE
A permanent magnet device for implantation in the eyelids including at least two magnet bodies enclosed in substantially shape-dependent manner by an enveloping body consisting of a ductile, tissue-compatible material, the enveloping body being substantially gastight and having at least one constric-tion in the radial direction.
A permanent magnet device for implantation in the eyelids including at least two magnet bodies enclosed in substantially shape-dependent manner by an enveloping body consisting of a ductile, tissue-compatible material, the enveloping body being substantially gastight and having at least one constric-tion in the radial direction.
Description
~06~?7~0 BACKGROUND OF THE INVENTION
r Field of the Inven_ion The present invention relates to a permanent maynet device for implantation, in particular in eyelids.
Description of the Prior Art Eyelids have, as is known, the task of on the one hand protecting the eyes from disturbing environmental influences and on the other hand protecting the eyes themselves from drying.
Accordingly, in the event of the inability of an eyelid to close (lagophthalmos) this task has to be taken over or assisted by artificial means. Analogously, this applies also in the case of the inability to open the eyelids at will (ptosis).
The modern technology of efficient permanent magnets has rendered it possible to implant successfully for this purpose magnets in eyelids. See, for example, W.D. Muhlbauer, H. Segeth, A. Viessmann "Restoration of Lid Function in Facial Palsy with Permanent Magnets", Abstract book of II. Congress of the European Section of International Confederation of Plastic Reconstructive Surgery, Madrid 197~.
Such magnets are constructed in bowed form, selected in pairs for the individual lid curvature from a multiplicity of magnets of various curvature radii and cross-sections and subsequently implanted individually into the upper and lower lid. An adaptation of the magne-ts, for example, by more ,. . .
- 106~790 bending, involves the danger of breakage of the brittle magnet body. For this reason, the possible adaptation work is restricted to a shortening of the magnet body, for example,by abrasive cutting.
SUMMARY OF THE INVENTION
Accordingly, one object of this invention is to provide a permanent magnet device for implantation, in particular, in eyelids and which can be simply adapted to the individual lid curvature and be anchored securely in the tissue.
Another object of this invention is to provide such a device in which the magnet masses are minimized by use of the (in themselves, not compatible with tissue) high-performance permanent magnets consisting of rare earths-cobalt alloys, such as SmCo5.
Briefly, these and other objects of the present invention are achieved by a permanent magnet device adapted for implantation in the eyelids comprising at least two magnet bodies and, at least one spacer arranged between the magnet bodies. A separate enveloping body of ductile, tissue-compatible material encloses and cLings to the magnet bodies,the enveloping body also enclosing the at least one spacer and having at least one constriction in the radial direction located at each of the at least one spacer, whereby the magnet device may hold the eyelids in a desired position.
~06~7~) Advantages of this device are the possibility of adaptation of the permanent magnet by bending, and the secure anchorage obtainable in the tissue lnto which implalltatioll is to bc effected.
BRIEF DESCRIPTION OF THE DRAWINGS
A more complete appreciation of the invention and many of the attendant advantages thereof will be readily obtained as the same becomes better understood by reEerence to the following detailed description when considered in connection with the accompanying drawi.ngs, wherein:
FIG. 1 shows an eyelid permanent magnet device in section, in extended representation, FIG. 2 shows a variant of a built-in spacer between the magnet bodies of the permanent magnet device of FIG. 1, FIG. 3 is the schematic representation of the end closures of the eyelid permanent magnet device of FIG. 1, FIG. 4 is an alternate schematic representation of the end closures of the eyelid permanent magnet device of FIG. 1, FIG. 5 is an end cross section of the permanent magnet device in a lobe, or rounded projectiOn, shape"
FIG. 6 is an end cross section of the permanent magnet device with the enveloping body co~structed partly in net form and covered with a net of tissue compatible material, and FIG. 7 is an end cross section of the permanent magnet device in which the enveloping body is covered with a net of - tissue compatible material.
106~37~30 DESCRIPTION OF THE PREFERRED EMBODIMENTS
Referring now to the drawings, wherein like reference numerals designate identical or corresponding parts and more particularly to FIG. 1 thereof, an eyelid permanent magnet device includes three magnet bodies 1, 2, 3. An enveloping body 4 encloses the magnet bodies 1, 2, 3 at least on their longitudinal sides and has, at the ends, the closures 9, 10. Between the individual magnet bodies 1, 2, 3 are spacers 7, 8 which are centered by constrictions 5, 6.
The magnetization of the magnet bodies 1, 2, 3 is, in FIG. 1, vertical to the plane of the drawing and in the same sense. In FIG. 3 the magnetization direction is characterized by N = north pole and S = south pole.
The magnet bodies 1, 2, 3 consist of sintered SmCo5 and are fixed in their position by the enveloping body 4. The spacers 7, 8 consist of synthetic rubber material and arc accordingly deformable so that the eyelid permanent magnet device can, after the fashion of a polygon, be adjusted to the desired favorable curved form for implantation into the eyelid concerned.
A round spacer 70 can be seen from FIG. 2. This spacer 70 allows relatively large angles to be adjusted in the polygon and need not necessarily be deformable.
The end construction of the closure 10 has been formed according to FIG. 3 by folding. The external shape of the enveloping body is, like that of the enclosed magnet bodies 1, 2, 3, rectangular with rounded edges. The rounding on all sides which is necessary for implanted bodies has been attained at the closures 9, 10 by welding the ends, whereby the desired sealing against tissue fluids entcring the permanent magnets or against any gases that may emerge from the permanent magnets is also ensured. Alternatively, the external shape of the enveloping body can be elliptical, as illustrated in FIG. 4.
10697~0 The enveloping body 4 is produced from gold foil, but could also be produced from other, medically proven metals or plastics. The anchoring 1n the tissue, which anchoring is necessary because of the high magnetic forces occurring, may be effected by sewing up at the constrictions 5, 6 and at the end-lobe-shaped closures 9, 10. In a preferred embodiment the end lobes are perforated for fixing the magnet assembly in the tissue of the living being. Additionally, there could be arranged on the enveloping body 4 a protuberance 11 which renders possible an anchorage in the tissue thereby providing the magnet with a lobe, or rounded projection, shape with respect to the protuberance, as shown in Figure 5. Also conceivable as shown in Figures 6 and 7 is a partially netlike construction 12 of the enveloping body 4 and/or a covering of the enveloping body by a net 13 consisting of tissue-compatible material in order that the implanted permanent magnet may at least partially in this anchorage be grown through by tissue.
Further similar constructions are likewise conceivably directed to minimizing the surface pressure created by the attraction or repulsion forces of the magnet bodies on the tissue. In any case, however, it is important that the magnet bodies 1, 2, 3 be sealed so as to be gastight. It therefore is advisable, even in the case of gastight enveloping bodies 4, to apply a protective layer of a tissue-compatible substance, since otherwise the magnet bodies 1, 2, 3 could cause harmful tissue reactions in the eventof mechanical damage to the enveloping body 4. For this purpose, good results have also been obtained with the medically proven silicones.
Multi-membered permanent magnets are, of course, more adaptable to the individual lid conditions; the three-membered version described in the above embodiment may be modified in any desired manner.
Through the possibility of using high-performdnce permanent magnets, e.g. of SmCo5, the cross-scctiol~ of thc eyelid permanent magnet device may be reduced by almost a factor of 4 compared to conventional magnets. Depending on the mutual assignment of the poles of the permanent magnets that are to be implanted, the inability to close or open an eyelid can be overcome by a single type of permanent magnet device.
The inventive solution can be adapted to the progressive technology of medical materials. The enveloping body could accordingly be produced from a not yet available, highly compact plastics substance without acceptance of larger dimensions. A net made for example from reinforced plastics material could enclose the individual (sealed gastight by a protective coating) magnet bodies 1, 2, 3 and, accordingly, be enveloping body and, at the same time, an ideal anchorage in the tissue.
Obviously, numerous additional modifications and variations of the present invention are possible in light of the above teachings. It is therefore to be understood that within the scope of the appended claims, the invention may be practiced otherwise than as specifically described llereill.
r Field of the Inven_ion The present invention relates to a permanent maynet device for implantation, in particular in eyelids.
Description of the Prior Art Eyelids have, as is known, the task of on the one hand protecting the eyes from disturbing environmental influences and on the other hand protecting the eyes themselves from drying.
Accordingly, in the event of the inability of an eyelid to close (lagophthalmos) this task has to be taken over or assisted by artificial means. Analogously, this applies also in the case of the inability to open the eyelids at will (ptosis).
The modern technology of efficient permanent magnets has rendered it possible to implant successfully for this purpose magnets in eyelids. See, for example, W.D. Muhlbauer, H. Segeth, A. Viessmann "Restoration of Lid Function in Facial Palsy with Permanent Magnets", Abstract book of II. Congress of the European Section of International Confederation of Plastic Reconstructive Surgery, Madrid 197~.
Such magnets are constructed in bowed form, selected in pairs for the individual lid curvature from a multiplicity of magnets of various curvature radii and cross-sections and subsequently implanted individually into the upper and lower lid. An adaptation of the magne-ts, for example, by more ,. . .
- 106~790 bending, involves the danger of breakage of the brittle magnet body. For this reason, the possible adaptation work is restricted to a shortening of the magnet body, for example,by abrasive cutting.
SUMMARY OF THE INVENTION
Accordingly, one object of this invention is to provide a permanent magnet device for implantation, in particular, in eyelids and which can be simply adapted to the individual lid curvature and be anchored securely in the tissue.
Another object of this invention is to provide such a device in which the magnet masses are minimized by use of the (in themselves, not compatible with tissue) high-performance permanent magnets consisting of rare earths-cobalt alloys, such as SmCo5.
Briefly, these and other objects of the present invention are achieved by a permanent magnet device adapted for implantation in the eyelids comprising at least two magnet bodies and, at least one spacer arranged between the magnet bodies. A separate enveloping body of ductile, tissue-compatible material encloses and cLings to the magnet bodies,the enveloping body also enclosing the at least one spacer and having at least one constriction in the radial direction located at each of the at least one spacer, whereby the magnet device may hold the eyelids in a desired position.
~06~7~) Advantages of this device are the possibility of adaptation of the permanent magnet by bending, and the secure anchorage obtainable in the tissue lnto which implalltatioll is to bc effected.
BRIEF DESCRIPTION OF THE DRAWINGS
A more complete appreciation of the invention and many of the attendant advantages thereof will be readily obtained as the same becomes better understood by reEerence to the following detailed description when considered in connection with the accompanying drawi.ngs, wherein:
FIG. 1 shows an eyelid permanent magnet device in section, in extended representation, FIG. 2 shows a variant of a built-in spacer between the magnet bodies of the permanent magnet device of FIG. 1, FIG. 3 is the schematic representation of the end closures of the eyelid permanent magnet device of FIG. 1, FIG. 4 is an alternate schematic representation of the end closures of the eyelid permanent magnet device of FIG. 1, FIG. 5 is an end cross section of the permanent magnet device in a lobe, or rounded projectiOn, shape"
FIG. 6 is an end cross section of the permanent magnet device with the enveloping body co~structed partly in net form and covered with a net of tissue compatible material, and FIG. 7 is an end cross section of the permanent magnet device in which the enveloping body is covered with a net of - tissue compatible material.
106~37~30 DESCRIPTION OF THE PREFERRED EMBODIMENTS
Referring now to the drawings, wherein like reference numerals designate identical or corresponding parts and more particularly to FIG. 1 thereof, an eyelid permanent magnet device includes three magnet bodies 1, 2, 3. An enveloping body 4 encloses the magnet bodies 1, 2, 3 at least on their longitudinal sides and has, at the ends, the closures 9, 10. Between the individual magnet bodies 1, 2, 3 are spacers 7, 8 which are centered by constrictions 5, 6.
The magnetization of the magnet bodies 1, 2, 3 is, in FIG. 1, vertical to the plane of the drawing and in the same sense. In FIG. 3 the magnetization direction is characterized by N = north pole and S = south pole.
The magnet bodies 1, 2, 3 consist of sintered SmCo5 and are fixed in their position by the enveloping body 4. The spacers 7, 8 consist of synthetic rubber material and arc accordingly deformable so that the eyelid permanent magnet device can, after the fashion of a polygon, be adjusted to the desired favorable curved form for implantation into the eyelid concerned.
A round spacer 70 can be seen from FIG. 2. This spacer 70 allows relatively large angles to be adjusted in the polygon and need not necessarily be deformable.
The end construction of the closure 10 has been formed according to FIG. 3 by folding. The external shape of the enveloping body is, like that of the enclosed magnet bodies 1, 2, 3, rectangular with rounded edges. The rounding on all sides which is necessary for implanted bodies has been attained at the closures 9, 10 by welding the ends, whereby the desired sealing against tissue fluids entcring the permanent magnets or against any gases that may emerge from the permanent magnets is also ensured. Alternatively, the external shape of the enveloping body can be elliptical, as illustrated in FIG. 4.
10697~0 The enveloping body 4 is produced from gold foil, but could also be produced from other, medically proven metals or plastics. The anchoring 1n the tissue, which anchoring is necessary because of the high magnetic forces occurring, may be effected by sewing up at the constrictions 5, 6 and at the end-lobe-shaped closures 9, 10. In a preferred embodiment the end lobes are perforated for fixing the magnet assembly in the tissue of the living being. Additionally, there could be arranged on the enveloping body 4 a protuberance 11 which renders possible an anchorage in the tissue thereby providing the magnet with a lobe, or rounded projection, shape with respect to the protuberance, as shown in Figure 5. Also conceivable as shown in Figures 6 and 7 is a partially netlike construction 12 of the enveloping body 4 and/or a covering of the enveloping body by a net 13 consisting of tissue-compatible material in order that the implanted permanent magnet may at least partially in this anchorage be grown through by tissue.
Further similar constructions are likewise conceivably directed to minimizing the surface pressure created by the attraction or repulsion forces of the magnet bodies on the tissue. In any case, however, it is important that the magnet bodies 1, 2, 3 be sealed so as to be gastight. It therefore is advisable, even in the case of gastight enveloping bodies 4, to apply a protective layer of a tissue-compatible substance, since otherwise the magnet bodies 1, 2, 3 could cause harmful tissue reactions in the eventof mechanical damage to the enveloping body 4. For this purpose, good results have also been obtained with the medically proven silicones.
Multi-membered permanent magnets are, of course, more adaptable to the individual lid conditions; the three-membered version described in the above embodiment may be modified in any desired manner.
Through the possibility of using high-performdnce permanent magnets, e.g. of SmCo5, the cross-scctiol~ of thc eyelid permanent magnet device may be reduced by almost a factor of 4 compared to conventional magnets. Depending on the mutual assignment of the poles of the permanent magnets that are to be implanted, the inability to close or open an eyelid can be overcome by a single type of permanent magnet device.
The inventive solution can be adapted to the progressive technology of medical materials. The enveloping body could accordingly be produced from a not yet available, highly compact plastics substance without acceptance of larger dimensions. A net made for example from reinforced plastics material could enclose the individual (sealed gastight by a protective coating) magnet bodies 1, 2, 3 and, accordingly, be enveloping body and, at the same time, an ideal anchorage in the tissue.
Obviously, numerous additional modifications and variations of the present invention are possible in light of the above teachings. It is therefore to be understood that within the scope of the appended claims, the invention may be practiced otherwise than as specifically described llereill.
Claims (14)
1. A permanent magnet device adapted for implantation in the eyelids comprising:
at least two magnet bodies; and at least one spacer arranged between the magnet bodies; and a separate enveloping body of ductile, tissue-compatible material enclosing and clinging to the magnet bodies, said enveloping body also enclosing said at least one spacer and having at least one constriction in the radial direction located at each of said at least one spacer, whereby said magnet device may hold said eyelids in a desired position.
at least two magnet bodies; and at least one spacer arranged between the magnet bodies; and a separate enveloping body of ductile, tissue-compatible material enclosing and clinging to the magnet bodies, said enveloping body also enclosing said at least one spacer and having at least one constriction in the radial direction located at each of said at least one spacer, whereby said magnet device may hold said eyelids in a desired position.
2. The permanent magnet device according to Claim 1 wherein:
the enveloping body is approximately gastight.
the enveloping body is approximately gastight.
3. The permanent magnet device according to Claim 1 wherein:
the magnet bodies are rare earth-cobalt alloys.
the magnet bodies are rare earth-cobalt alloys.
4. The permanent magnet device according to Claim 1, 2 or 3 wherein:
the enveloping body is tubular and closed at the ends and has a substantially rectangular cross-section.
the enveloping body is tubular and closed at the ends and has a substantially rectangular cross-section.
5. The permanent magnet device according to Claim 1, 2 or 3 wherein:
the enveloping body is tubular and closed at the ends and has a substantially elliptical cross-section.
the enveloping body is tubular and closed at the ends and has a substantially elliptical cross-section.
6. The permanent magnet device according to Claim 1, 2 or 3 wherein:
the spacer is resilient.
the spacer is resilient.
7. The permanent magnet device according to Claim 1, 2 or 3 wherein:
the enveloping body consists of a metallic material selected from the group consisting of gold, silver, platinum, rhodium, ruthenium, palladium, iridium and their alloys of stainless steel.
the enveloping body consists of a metallic material selected from the group consisting of gold, silver, platinum, rhodium, ruthenium, palladium, iridium and their alloys of stainless steel.
8. The permanent magnet device according to Claim 1 wherein:
the enveloping body has end lobes.
the enveloping body has end lobes.
9. The permanent magnet device according to Claim 8 wherein:
the end lobes are perforated.
the end lobes are perforated.
10. The permanent magnet device according to Claim 1, 2 or 3 wherein:
the enveloping body has at least one closure in the shape of a rounded projection on one part of its longitudinal side.
the enveloping body has at least one closure in the shape of a rounded projection on one part of its longitudinal side.
11. The permanent magnet device according to Claim 1, 3 or 8 including:
a second tissue-compatible protective layer covering the magnet bodies.
a second tissue-compatible protective layer covering the magnet bodies.
12. The permanent magnet device according to Claim 1, 3 or 8 wherein:
the enveloping body is constructed at least partly in net form.
the enveloping body is constructed at least partly in net form.
13. The permanent magnet device according to Claim 1, 2 or 3 wherein:
the enveloping body is covered with a net consisting of a tissue-compatible material.
the enveloping body is covered with a net consisting of a tissue-compatible material.
14. The permanent magnet device according to Claim 1, 3 or 8 wherein:
the enveloping body is constructed at least partly in net form and is covered with a net of tissue-compatible material.
the enveloping body is constructed at least partly in net form and is covered with a net of tissue-compatible material.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH1434275A CH591237A5 (en) | 1975-11-06 | 1975-11-06 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1069790A true CA1069790A (en) | 1980-01-15 |
Family
ID=4400005
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA264,426A Expired CA1069790A (en) | 1975-11-06 | 1976-10-29 | Permanent magnet device for implantation |
Country Status (8)
| Country | Link |
|---|---|
| US (1) | US4197840A (en) |
| JP (1) | JPS5259989A (en) |
| CA (1) | CA1069790A (en) |
| CH (1) | CH591237A5 (en) |
| DE (2) | DE2553244A1 (en) |
| FR (1) | FR2330376A1 (en) |
| GB (1) | GB1550219A (en) |
| NL (1) | NL7612210A (en) |
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Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3206657A (en) * | 1961-04-04 | 1965-09-14 | Moriya Saburo Miyata | Magnet assembly for filtering |
| US3565073A (en) * | 1968-04-15 | 1971-02-23 | Jerry D Giesy | Method and means for attaching a body appendage |
| US3794041A (en) * | 1971-11-30 | 1974-02-26 | Yeda Res & Dev | Gastrointestinal catheter |
| US3752162A (en) * | 1972-04-10 | 1973-08-14 | Dow Corning | Artificial cutaneous stoma |
| DE2335475A1 (en) * | 1973-07-12 | 1975-01-30 | Wolfgang D Dr Med Muehlbauer | Eyelid magnet for facial paresis - magnetic strip embedded in plastics, magnetised transversely |
| FR2278314A1 (en) * | 1974-07-16 | 1976-02-13 | Elbaz Jean | Prosthesis for aiding contraction of defective muscle - eg. eyelid having element adapted in shape to eyelid |
| US4005699A (en) * | 1974-10-09 | 1977-02-01 | Louis Bucalo | Methods and apparatus for use in magnetic treatment of the body |
-
1975
- 1975-11-06 CH CH1434275A patent/CH591237A5/xx not_active IP Right Cessation
- 1975-11-27 DE DE19752553244 patent/DE2553244A1/en not_active Withdrawn
- 1975-11-27 DE DE7537747U patent/DE7537747U/en not_active Expired
-
1976
- 1976-09-29 US US05/727,654 patent/US4197840A/en not_active Expired - Lifetime
- 1976-10-29 CA CA264,426A patent/CA1069790A/en not_active Expired
- 1976-11-03 NL NL7612210A patent/NL7612210A/en not_active Application Discontinuation
- 1976-11-04 JP JP51132735A patent/JPS5259989A/en active Pending
- 1976-11-04 FR FR7633314A patent/FR2330376A1/en not_active Withdrawn
- 1976-11-04 GB GB45934/76A patent/GB1550219A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR2330376A1 (en) | 1977-06-03 |
| GB1550219A (en) | 1979-08-08 |
| NL7612210A (en) | 1977-05-10 |
| DE7537747U (en) | 1977-08-11 |
| JPS5259989A (en) | 1977-05-17 |
| US4197840A (en) | 1980-04-15 |
| DE2553244A1 (en) | 1977-05-12 |
| CH591237A5 (en) | 1977-09-15 |
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