CA1109746A - Biopsy apparatus and methods of constructing and utilizing same - Google Patents

Biopsy apparatus and methods of constructing and utilizing same

Info

Publication number
CA1109746A
CA1109746A CA277,928A CA277928A CA1109746A CA 1109746 A CA1109746 A CA 1109746A CA 277928 A CA277928 A CA 277928A CA 1109746 A CA1109746 A CA 1109746A
Authority
CA
Canada
Prior art keywords
tube
needle member
needle
cannula
body tissue
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
Application number
CA277,928A
Other languages
French (fr)
Inventor
Shelby M. Baylis
Jorge S. Szauer
Original Assignee
Shelby M. Baylis
Jorge S. Szauer
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority to US05/684,480 priority Critical patent/US4099518A/en
Priority to US684,480 priority
Priority to US05/774,408 priority patent/US4177797A/en
Priority to US774,408 priority
Application filed by Shelby M. Baylis, Jorge S. Szauer filed Critical Shelby M. Baylis
Priority claimed from CA381,819A external-priority patent/CA1129746A/en
Application granted granted Critical
Publication of CA1109746A publication Critical patent/CA1109746A/en
Expired legal-status Critical Current

Links

Classifications

    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B10/00Other methods or instruments for diagnosis, e.g. instruments for taking a cell sample, for biopsy, for vaccination diagnosis; Sex determination; Ovulation-period determination; Throat striking implements
    • A61B10/02Instruments for taking cell samples or for biopsy
    • A61B10/0233Pointed or sharp biopsy instruments
    • A61B10/025Pointed or sharp biopsy instruments for taking bone, bone marrow or cartilage samples
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B2017/00681Aspects not otherwise provided for
    • A61B2017/00685Archimedes screw

Abstract

ABSTRACT OF THE DISCLOSURE
An improved biopsy apparatus is disclosed. The apparatus comprises a hollow outer cannula within which is initially disposed a solid inner puncture trocar. In use, a biopsy sample is obtained from a patient by first inserting the outer cannula - trocar apparatus into the patient at a desired location. Thereafter, the solid inner initial puncture trocar is withdrawn from the outer cannula, while the outer cannula remains in place at the desired specimen location. A hollow inner cannula is then inserted into the outer cannula, and upon withdrawal of the inner cannula from the outer cannula the desired specimen is obtained within the hollow interior of the inner cannula. In accordance with a second embodiment there is provided an improved rotary biopsy device which includes an elongated inner needle member used for initial penetration of the body tissue, with an outer hollow cylindrical cutting tube thereafter being slidably received over the needle member. In use, the needle member is first penetrated, by rotating same, into the desired specimen extracting location. The outer tube is then slidably disposed thereover and pushed downwardly until it also penetrates the body tissue, and both the tube and needle are simultaneously withdrawn with the sample collected interiorly of the tube.

Description

1~9746 Background of the Invention 1. Field of the Invention The present invention relates generally to apparatus for use in connection with obtaining biopsy specimens such as, for example, from the breast, thyroid, solid tumors, bone marrow, liver, kidney, pleura, synovia, and other soft tissue.
2. Description of the Prior Art Heretofore, there has not been developed any generally acceptable and workable biopsy device which lends itself to neatly and xelatively painlessly removing a biopsy tissue sample from a patient and at the same time providing easy removability of the specimen from the device without endangering the patient or the quality of the extracted specimen.
Among the biopsy devices disclosed to date are those described in United States Patent Numbers 2,541,542; 3,628,524;
3,800,783; 3,893,445; and 3,913,566. Such prior art devices have employed methods for extracting specimens such as, for example, by means of rotation of a ~eedle device, by means of a loop of cutting thread disposed on a cannula, by means of a hooked blade arranged within a removable specimen gathering sheath, or by means of a cutting tube disposed within a hollow handle, amongst other things. Such devices, however, have not satisfactorily met the demand for a safe biopsy instrumentwhich is capable of producing satisfactory specimens.
The embodiments of the present invention eliminate the disadvantages and shortcomings attendant all of these con-ventional prior art devices by providing biopsy apparatus having improved constructions to reduce trauma to the patient and to provide a high quality tissue specimen without endangering either the patient or the extracted specimen.
X

~9746 Summary of the Invention In a first embodiment, the present invention provides an apparatus for extracting biopsy samples and the like. The apparatus includes an elongated hollow outer cannula having open distal and proximal ends, the distal end defining a cutting edge.
Solid inner means corresponding generally in length and shape to the outer cannula is provided which is adapted to be tightly re-ceived within the hollow outer cannula for initial penetration of the body tissue. A hollow inner cannula adapted to be received within the hollow outer cannula after the solid initial puncture means has been removed therefrom is also provided, and the inner cannula has an elongated distal cutting end section which projects beyond the distal cutting edge of the outer cannula when the inner cannula is introduced thereinto in operative position.
Also, the distal cutting end section of the inner cannula has disposed therein cutting means for cutting the body tissue as the inner cannula is withdrawn from the body and thus causing the tissue sample to be collected interiorly of the hollow inner cannula.
It is an object of the present invention to provide a biopsy apparatus having three main elements, including a hollow outer cannula having disposed therein either a solid inner ini-tial puncture trocar or a hollow inner cannula.
In accordance with the first embodiment ofthe present invention, the hollow inner cannula is preferably provided with a novel distal cutting end section having disposed therein a truncated conical cutting section having its base adjacent the distal edge of the inner cannula so as to effect a specimen-cutting action upon withdrawal of the inner cannula from the patient's body. Optionally, there may be provided at least one sharp thread on the inner periphery of the novel inner cannula end section.

In accordance with a second embodiment of the present invention there is provided a device for extracting biopsy samples and the like including an elongated needle member having a distal and proximal end, the distal end defining a cutting edge for initial penetration ofthe body tissue. The needle member has disposed along at least a portion of thelength thereof body tissue cutting means. A hollow cylindrical cutting tube of substantially uniform diameter having a distal and proximal end with the distal end defining a cutting edge is also provided.
The tube is adapted to be substantially tightly received over the needle member having the cu'ting means disposed thereon, after the needle menber has been penetrated into the body tissue.
The distal cutting edge of the tube projects beyond the distal cutting edge of the needle member in the body tissue when the tube is disposed over the needle member in an operative position.
The needle member and the tube are adapted to be withdrawn simultaneously from the body with the tissue sample being collect-ed interiorly-of the tube.
In the second embodiment, the body tissue cutting means preferably comprises a sharp helical thread disposed along a substantial portion of the length of the needle member toeffect a tissue-cutting action when the needle member is rotated.
The tissue sample is collected interiorly of the tube and between adjacent thread portions of the helical thread when the needle member and tube are simultaneously withdrawn from thebody. Both the needle member and the tube are provided with respective handles to aid in maneuvering same, with the handle of the needle member being adapted to permit the tube to be slidably received there-over. The distal cutting edge of the tube is defined by a sub-stantially circular beveled distal end edge of the cylindricalcutting tube. In the cperative position, the proximal end of the needle member projects beyond the proximal end of the tube.

Another object of the invention is to provide a biopsy apparatus wherein the novel cutting end section of the inner cannula is provided with a through hole to facilitate removal of an extracted specimen from the interior of ~he inner cannula and means are provided for inserting into the through hole to remove the specimen.
Further objects and details of thepresent invention will become apparent to those skilled in the art upon reading the following specification, appended claims and the accompanying drawing.
Brief Description of the Drawings Figure 1 illustrates a side elevational view of a prior art hollow outer cannula.
Figure 2 depicts a side elevational view of a prior art solid inner puncture trocar.
Figure 3 illustrates a side elevational view of a hollow inner cannula with novel end section in accordance with a first embodiment of the present invention.
Figure 4 depicts an enlarged sectional view of a first novel end section construction.
Figure 5 illustrates an enlarged sectional view of a second novel end section construction.
Figure 6 depicts a view of thenovel end section taken along line 6-6 of Figure 5.
Figure 7 illustrates a view of the novel end section taken along the line 7-7 in Figure 6.

%;; ' ~ 6 Figure 8 illustrates a side elevational view of the assembled biopsy device in accordance with a second embodiment of the present invention.
Figure 9 depicts a front elevational view of the inner needle member as inserted into the body, with the outer tube being partially inserted thereover in accordance with the second embodiment of the invention.
Figure 10 depicts a front elevational view of the device of Figures 8and 9 in an operative position wherein the outer tube is fully inserted into the body tissue.
Figure 11 illustrates a front elevational view of the device of Figures 8 to 10 as the inner needle member and outer tube are being simultaneously withdrawn from the patient's body.
Figure 12 depicts an enlarged cut-away sectionalview of the specimen collected interiorly of the tube and between adja-cent thread portions of the needle member of the device in accor-dance with the second embodiment of the invention.
Detailed Description of 'the Invention With reference to Figure 1, there is shown a hollow outer =~ ~

74~
, cannula of conventional construction. The cannula 1 includes a beveled distal end point 2 for penetration into the body tissue and a hub 3 of standard construction to permit gripping of the hub in the fingers of the user. Both the beveled distal end point 2 and the proximal end 4 of the cannula 1 are open.
Figure ~ illustrates a solid inner initial puncture tro-car 5 which is also of standard construction. The trocar 5 corresponds generally in length and shape to the cannula 1 so as to fit snugly therein. The beveled distal end 6 of the tro-car 5 is designed to match the beveled distal end 2 of the can-nula 1. Upon insertion of the trocar 5 into the cannula 1, the respective beveled distal ends ofthe cannula 1 and trocar 5 will align with each other and the hub portion 7 of the trocar 5 will extend beyond the open proximal end 4 of the cannula 1 to permit easy extraction of the trocar 5 from the cannula 1.
Referring now to Figure 3, there is shown a hollow inner cannula 8 having a novel end section designated generally as 9 in accordance with a first embodiment of the invention.
The inner cannula 8 corresponds generally in shape to the outer cannula 1, and will thus also fi~ quite snugly into the outer cannula 1. Upon insertion of the inner cannula 8 into the outer cannula 1, the novel end section 9 of inner cannula 8 will extend approximately 3 cm beyond the open distal end 2 of the outer cannula 1, and the hub portion 10 of inner cannula 8 will extend sufficiently beyond open end 4 of outer cannula 1 so as to permit easy maneuvering ofthe inner cannula 8 within the outer cannula 1.
It should be noted that the outer cannula 1, the inner trocar 5 and the inner cannula 8 may be constructed of standard materials commonly used in the manufacture of surgical instruments.

For example, stainless steel, polyurethane, or other suitable i``' .

` 3LlOg746 surgical material may be employed.
In operation, the trocar 5 is first inserted into the hollow outer cannula 1. The trocar-cannula apparatus is next inserted into the patient's body at the desired specimen ex-tracting location. The beveled end 2 of outer cannula 1 havingthe beveled end 6 of trocar 5 aligned therein thus serves to penetrate the body tissue. The solid inner trocar 5 serves as a guide for the outer cannula 1 during insertion and also pre-vents body tissue from entering the hollow outer cannula 1.
After full insertion, the trocar 5 is withdrawn completely-from the outer cannula 1 while the outer cannula 1 remains stationary in the patient's body.
Next, the inner cannula 8 is completely inserted into the outer cannula 1 so that the novel end section 9 extends approx-imately 3 cm beyond the open distal end 2 of outer cannula 1.The end section 9 of inner cannula 8 may preferably have disposed therein a truncated conical cutting section 11 having its base adjacent the distal edge 13 of the inner cannula 8, as depicted in Figure 4. The conical cutting section 11 performs a cutting action by means of its sharp truncated edge 12. Preferably, the anguIar space formed between the conical cutting section 11 and the interior of the end section 9 is at least partially solid so as to prevent the specimen from becoming trapped therein. It can thus be seen that when the inner cannula 8 is withdrawn from the patient's body, the truncated edge 12 of the conical cutting section 11 will perform a cutting action and cause body tissue to accumulate interiorly of the end section 9 during the withdrawal operation. It should be noted that the outer cannula 1 and inner cannula 8 are preferably withdrawn simultaneously from the pat-ient's body~ The specimen collected interiorly of the end section 9 110~746 will be approximately 2.5 cm to 3 cm in length, due to the 3 cmlength of end section 9 which protrudes beyond distal end 2 of outer cannula 1.
Referring now to Figure 5, there is illustrated a second construction of the novel end section 9 of inner cannula 8. In addition to the truncated conical cutting section 11, the interior surface of the end section 9 is further provided with sharp cutting threads 14. The cutting threads 14 are shaped in a manner so as to aid the truncated conical cutting section 11 in cutting and retaining the body tissue interiorly of the end section 9 upon withdrawal thereof from the patient's body.
With the provision of cutting threads 14, and also in any desired application of the invention, it is beneficial to rotate the inner cannula 8 before withdrawal from the patient's body, while the outer cannula 1 remains stationary. Such rotating action will not be traumatic to the patient since the outer cannula l remains stationary, and will serve to aid in the cutting action performed by the cutting means of end section 9.
As depicted in Figures 4, 5 and 6, the novel end sec-tion 9 of inner cannula 8 is provided with a through hole 15.After the inner cannula 8 and the outer cannula 1 have been sim-ultaneously withdrawn from the patient's body, the inner cannula ~ is thereafter entirely withdrawn from the outer cannula 1. The extracted specimen which is contained interiorly of the end section 9 is thereafter easily removed from the end section 9 via the through hole 15. This can be performed, for example, by inserting a wire 16(Figure 4) or other suitable implement into the through hole 15 to aid in extracting the specimen therefrom.
As shown in Figure 7, the through hole preferably consumes 90 of either side of the cylindrical periphery of the end section 9.

With reference to Figure 8, there is depicted a novel rotary biopsy device according to the second embodiment of the present invention. The device includes an elongated needle member 17 which is shown as disposed within a hollow cylindrical cutting-tube 21. Both the needle 17 and the tube ~1 are of uniform dia-meter. The needle 17 has provided on the proximal end thereof a handle 31 which is of slightly larger diameter than the needle 17 but which is of sufficiently minimal diameter to permit the tube 21, of somewhat larger diameter, to slide thereover. As can be seen in the cut-away portion of the tube 21, the needle 17 has disposed along a suitable length thereof a helical thread 41.
The thread 41 has an acutely sharp edge to facilitate the cutting action as well as the specimen retaining action which will be described in greater detail hereinbelow. Disposed adjacent the proximal end of the tube 21 is a handle portion 51. The handle 51 is fabricated of a rod portion 5a which extends substantially perpendicular to the longitudinal axis of the tube 21 and a knob 5b secured to the end of rod Sa.
The distal end 61 of the needle 17 comprises a sharp needle point which permits the initial penetration of the needle 17 into the patient's body to be relatively painless with minimal trauma. The distal end 71 of the tube 21 also comprises a sharp cutting edge as will now be described with reference to Figure 9.
Although the device as depicted in Figure 8 illustrates the needle 17 as being disposed within the tube 21, it will now be understood with respect to Figure 9 that initially the needle 17 and tube 2/are completely separated. To commence the specimen-obtaining procedure, the needle 17is employed, via the sharp point 6~, to initially puncture the layer of skin 8/of the pat-ient's body. Next, to facilitate penetration of the needle lq into the body tissue 9~ the needle 17is rotated, by rotating the handle 3/of the needle 17 in the direction of the arrow shown-in Figure ~. Upon rotation, the sharp helical thread 4/
disposed along the length of needle l~permits the needle 17to be worked into the patient's body with minimal pain and trauma to the patient. After the needle l~has been rotated and p~netrated into the body tissue 9/to the desired position, the outer tube 2l is slidably positioned over the needle 17 and pushed downwardly towards the skin 8. In this connection, it should be noted with respect to Figures ~ that the inside diameter of the tube 2l is only slightly larger than the combined diameter of the needle 1 and the helical thread 4/disposed thereon, to just ensure a substantially tight fit between the needle 17and the tube 2/
inserted thereover. As can be seen in Figure ~, the sharp dis-tal cutting edge 7/of the tube 2/comprises a bevelled end edge thereof which is substantially circular in configuration. The edge 7lis extremely sharp to effect easy penetration of the tube ~ into the skin layer 8 and subsequently into the body tissue 9l, Referring now to FigurelO, the tube 2/is illustrated as fully inserted into body tissue 9lin its operative position.
The tube 2/has been pushed downwardly in the direction of the arrow shown in Figure~, and it should be noted that no rotational movement of the tube 2lis necessary to effect penetration, and indeed a pushing action is all that is required. In this con-nection, the handle 5/for the tube 2l(Figure ~) is employed to facilitate maneuvering of the tube 21 with respect to the needle 17 and the patient's body. Also, it should be noted that as the tube 21 is pushed downwardly over the needle 17, the needle 17 remains substantially stationary, and in effect serves as a guide for the tube 21 as it is inserted. When the needle 17 and tube 21 are in the relative positions depicted in Figure 10, the proximal end of the needle 17 including the handle 31 will be projected outwardly above the proximal end of the tube 21 as can be more clearly seen in Figure 8. Moreover, the distal cut-ting edge 71 will project into the body tissue 91 outwardly of the cutting point 61 of needle 17 as depicted in Figures 8 and 10.
With reference now to Figure 11, the withdrawal operation of the device will now be described. The tube 21 and needle 17 are withdrawn substantially simultaneously from the position shown in Figure 10 to that shown in Figure 11 in the direction of the arrow depicted in Figure 11. In this connection, it should be noted that as the tube 21 and needle 17 are withdrawn from the patient's body no rotational movement is required. As the tube 21 and needle 17 are withdrawn, the tissue specimen will be col-lected interiorly of the tube 21 between the slight space provided between the inside diameter of the tube 21 and the needle 17.
The major portion ofthe specimen willbe effectively contained between adjacent thread portions of the sharp helical thread 41 and in this manner a fairly large and entirely adequate specimen size can be collected and extracted from the patient's body, with minimal pain or trauma to the patient.
Referring now to Figure 12 an enlarged view of the ob-tained specimen 18 is depicted. It can be seen that the specimen is collected in the slight space present between the inside diame-ter of the tube 21 and the needle 17. The thread 41 substantially aids in collecting and retaining the specimen to be extracted. Thus, the helical thread 4/serves two important functions. First, upon insertion of the needle 17into the patient's body as des-cribed hereinabove, the sharp thread 4Iserves to cut the skin and tissue during the rotational movement of the needle 17to facilitate penetration thereof into the patient's body, Secondly, upon withdrawal of the needle 17within the tube 2l~ the thread 4 functions to collect and retain the specimen sample being ex-tracted.
After the device, with the specimen contained therein, has been fully withdrawn from the patient's body, the device may again be separated and the specimen simply and effectively removed therefrom with the use of suitable tools.
It should be noted that the needle 17and tube 2/may be constructed of standard materials commonly used in the manu-facture of surgical instruments. For example, stainless steel, polyurethane, or other suitable surgical material may be employed.
Although there have been described what are at present con-sidered to be the preferred embodiments of the invention, it will be understood that various modifications may be made therein, and it is intended to cover in the appended claims all such modifications as fall within the true spirit and scope of the invention.

Claims (6)

THE EMBODIMENTS OF THE INVENTION IN WHICH AN EXCLUSIVE
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A device for extracting biopsy samples and the like, comprising: an elongated needle member having a distal and proximal end, said distal end defining a cutting edge for initial penetration of the body tissue; said needle member having disposed along at least a portion of the length thereof body tissue cutting means; a hollow cylindrical cutting tube of substantially uniform diameter having a distal and proximal end, said distal end defining a cutting edge; said tube being adapted to be substantially tightly slidably received over said needle member having said cutting means disposed thereon, after said needle member has been penetrated into the body tissue; said distal cutting edge of said tube projecting beyond said distal cutting edge of said needle member in the body tissue when said tube is disposed over said needle member in an operative position; said needle member and said tube being adapted to be withdrawn substantially simultaneously from the body with the tissue sample being collected interiorly of said tube, and said body tissue cutting means comprising a sharp helical thread disposed along a substantial portion of the length of said needle member to effect a tissue-cutting action when said needle member is rotated; and said tissue sample being collected interiorly of said tube and between adjacent thread portions of said helical thread when said needle member and said tube are substantially simultaneously withdrawn from the body.
2. A device in accordance with claim 1, wherein: said proximal end of said needle member has disposed thereon a cylindrical handle member which is adapted to permit said tube to be slidably received thereover,
3. A device in accordance with claim 1, including a handle portion disposed on the outer surface of said tube adjacent the proximal end thereof to permit said tube to be maneuvered as said tube is inserted over said needle member into the body tissue.
4. A device in accordance with claim 3, wherein said handle portion of said tube comprises a rod member extending substantially perpendicularly outwardly from said tube and having a knob affixed thereto.
5. A device in accordance with claim 4, wherein said proximal end of said needle member defines a cylindrical handle member, the diameter of said handle being adapted to permit said tube to be slidably received thereover; and the diameter of said cylindrical handle member is greater than the diameter of said needle member.
6. A method of utilizing the device according to claim 1, comprising the steps of inserting said needle member into the body at a desired specimen extracting location by rotating said needle member to permit said helical thread to cut the body tissue; slidably inserting said cutting tube over said needle member into the body tissue; and substantially simultaneously withdrawing said needle member and said tube from said body.
CA277,928A 1976-05-10 1977-05-09 Biopsy apparatus and methods of constructing and utilizing same Expired CA1109746A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US05/684,480 US4099518A (en) 1976-05-10 1976-05-10 Biopsy apparatus
US684,480 1976-05-10
US05/774,408 US4177797A (en) 1977-03-04 1977-03-04 Rotary biopsy device and method of using same
US774,408 1977-03-04

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA381,819A CA1129746A (en) 1976-05-10 1981-07-15 Biopsy apparatus and methods of constructing and utilizing same

Publications (1)

Publication Number Publication Date
CA1109746A true CA1109746A (en) 1981-09-29

Family

ID=27103331

Family Applications (1)

Application Number Title Priority Date Filing Date
CA277,928A Expired CA1109746A (en) 1976-05-10 1977-05-09 Biopsy apparatus and methods of constructing and utilizing same

Country Status (7)

Country Link
JP (1) JPS5351686A (en)
CA (1) CA1109746A (en)
DE (1) DE2721012A1 (en)
FR (1) FR2350821A1 (en)
IT (1) IT1078312B (en)
NL (1) NL7705182A (en)
SE (1) SE7705443L (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0010321A1 (en) * 1978-10-19 1980-04-30 Renzo Dr. Brun Del Re Device for the single-handed operation of a biopsy instrument
SE422885B (en) * 1980-04-11 1982-04-05 Ursus Konsult Ab The electrode device
JPH0337604Y2 (en) * 1986-10-25 1991-08-08
IT1226152B (en) * 1988-07-05 1990-12-19 Francesco Pianetti NEEDLE TREQUARTI FOR LAPAROSCOPY.
DE8914955U1 (en) * 1989-12-18 1990-05-03 Wisap Gesellschaft Fuer Wissenschaftlichen Apparatebau Mbh, 8029 Sauerlach, De
AU6436594A (en) * 1993-04-30 1994-11-21 Px Holding S.A. Device for removing tissue by means of endoscopy
US5676545A (en) * 1994-08-15 1997-10-14 Jones; Shedrick D. Method and apparatus for implantation
ES2225915T3 (en) * 1996-08-26 2005-03-16 Shedrick D. Jones DEVICE FOR FIXING AN IMPLANT IN OSEO FABRIC.

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1867624A (en) * 1930-04-01 1932-07-19 Memorial Hospital For The Trea Device for obtaining biopsy specimens
US2850007A (en) * 1956-05-31 1958-09-02 American Cyanamid Co Biopsy device

Also Published As

Publication number Publication date
JPS5351686A (en) 1978-05-11
FR2350821A1 (en) 1977-12-09
DE2721012A1 (en) 1977-12-01
NL7705182A (en) 1977-11-14
IT1078312B (en) 1985-05-08
SE7705443L (en) 1977-11-11

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