US3903885A - Device for introducing flexible catheters - Google Patents

Device for introducing flexible catheters Download PDF

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Publication number
US3903885A
US3903885A US436798A US43679874A US3903885A US 3903885 A US3903885 A US 3903885A US 436798 A US436798 A US 436798A US 43679874 A US43679874 A US 43679874A US 3903885 A US3903885 A US 3903885A
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Prior art keywords
catheter
guide piece
bore
cannula
elastic element
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US436798A
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Heinz Fuchs
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B Braun Melsungen AG
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B Braun Melsungen AG
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M39/00—Tubes, tube connectors, tube couplings, valves, access sites or the like, specially adapted for medical use
    • A61M39/02—Access sites
    • A61M39/06—Haemostasis valves, i.e. gaskets sealing around a needle, catheter or the like, closing on removal thereof
    • A61M39/0606—Haemostasis valves, i.e. gaskets sealing around a needle, catheter or the like, closing on removal thereof without means for adjusting the seal opening or pressure
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M25/00—Catheters; Hollow probes
    • A61M25/01—Introducing, guiding, advancing, emplacing or holding catheters

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  • ABSTRACT A device for introducing flexible catheters for intravenous infusions and transfusions consists of a plastic cannula, which is suitable for the puncture of a blood vessel, and which, in its conical attachment, has a divisible catheter guide piece with a conical top. A foil jacket hose is fixed by means of a collet in the groove of the catheter guide piece.
  • a flexible catheter which consists of a hose of plastic material.
  • it can often be advanced only intermittently. In order to prevent its sliding back again, it is necessary to fix it intermittently. This necessity may also arise when the catheter is packed under sterile conditions in a thinwalled foil jacket hose which is squeezed together in the form of accordion pleats when the catheter is advanced and which has to be smoothed again by pulling it backwards from time to time.
  • devices are known which serve both as a catheter guide piece and, at the same time, as clamping device.
  • the catheter is fixed by simple compression with the aid of clamping jaws which are partly half-shell shaped.
  • the known devices have the drawback that with every movement of the catheter the clamping device must be manually operated and detached again in a complicated manner and that the catheter can be deformed upon too great a pressure which may cause the introduction of the catheter to fail because once a catheter is deformed it no longer can be advanced through the introduction cannula.
  • This object has been achieved in accordance with the invention by providing a device as a component part of a catheter guide piece which prevents the lateral passive directions of the catheter in both direction by its automatic braking effect. but which allows an active advancement of the catheter.
  • a shaped part 7 (having a chamber 6) is fixed which is shown in the embodiment of the drawing and which has been prepared from a rubber elastic material and which advantageously has a cylindrical shape and sits close to the likewise cylindrical chamber 6 of the catheter guide piece 3.
  • the shaped part 7 is held against longitudinal move ments by an integral flange 8 which is tightly fitted in a corresponding or complementary cutout or recess in the catheter guide piece.
  • the shaped part 7 In its conically tapering top 9 the shaped part 7 has a bore through which the catheter is guided and which is dimensioned in such a manner that the catheter can be moved therein with low resistance.
  • the degree of flexibility of this top 9 in the shaped part 7, which is provided with a bore. is such that upon pulling I or pushing back of the catheter, which fitsin the bore of the shaped part with slight resistance the flexibleinner sides of the bore which are parallel to'the axis of the catheter, are pulled backwards (i.e. downwardly in the drawing) and thus tilt over against the catheter so that an even greater tightening of the top 9 of shaped part 7 to the catheter surface is thus obtained which causes the desired braking effect.
  • the material for the shaped part 7 and the catheter it is possible to obtain the friction properties being most advantageous for the braking effect.
  • Another advantage of the shaped part 7 in the catheter guide piece 3 resides in the fact that blood which flows back after the puncture of a blood vessel in the introduction cannula 2 along the catheter is stopped by the tightly closing shaped part so that it cannot flow into the foil jacket hose 10, which serves for keeping the catheter sterile, and cannot contaminate it.
  • the surrounding jacket hose 10 may be fixed in the groove 12 of the catheter guide piece 3 by means of a collet 11 to which the jacket hose is glued or welded. Inside the catheter there may be a stiffening mandrel 13.
  • the elastic shaped part used as catheter brake with a continuous slot in longitudinal direction so that it may be separated from the catheter together with the catheter guide piece 3, which consists of two parts, when the catheter has been introduced.
  • a catheter placement unit comprising a plastic cannula adapted to be placed in a blood vessel having an attachment end portion including a generally conically shaped recess formed therein; a divisible catheter guide piece having a longitudinal bore formed therein and first and second end portions; said first end portion being conically shaped for frictional engagement in the conical recess of said cannula; said second end portion of said guide piece having a groove formed therein and a collet mounted in said groove in frictional engagement with said guide piece whereby said collet and the frictional engagement of said first end portion in said conical recess hold the guide piece together; a generally cylindrically shaped elastic element mounted in the bore of said guide piece; said element and guide piece bore having cooperating means for preventing longitudinal movement of said element in said bore, said cooperating means comprising a cooperating recess and flange; said elastic element having an internal bore formed therein and a tapered top portion tapering towards said cannula; and a catheter extending through the bore in said element and said cann

Abstract

A device for introducing flexible catheters for intravenous infusions and transfusions consists of a plastic cannula, which is suitable for the puncture of a blood vessel, and which, in its conical attachment, has a divisible catheter guide piece with a conical top. A foil jacket hose is fixed by means of a collet in the groove of the catheter guide piece. Inside the divisible catheter guide piece a suitably cylindrical shaped part of rubber-elastic material is arranged in such a manner, advantageously by means of a flange situated in a corresponding cutout in the catheter-guide piece, that it is not displaced, the shaped part having a bore in its pointed top the diameter of which is such that the catheter can be moved therein with low resistance.

Description

United States Patent Fuchs Sept. 9, 1975 [54] DEVICE FOR INTRODUCING FLEXIBLE 3,757,771 9/[973 Ruegg ct al l28/2l4.4 X
3,8] L440 5/ i 74 Moorehcad C18 i i |4.4
3,825,001 7/[974 Bennet ct al l28/2l4i4 [75] Inventor: Heinz Fuchs, Melsungen, Germany [73] Assignee: B. Braun Melsungen Aktiengesellschaft, Melsungen, Germany [22] Filed: Jan. 25, i974 [21] App]. No: 436,798
{30] Foreign Application Priority Data Feb. 6. 1973 Germany 4. 2305640 [52] US. Cl...i.... l28/2l4.4; [ZS/348; l28/DlG. [6 [S l Int. Cl ,i Afilm 05/00 [58] Field of Search l28/2l4.4, 221, 348, DIG. 16
{56] References Cited UNITED STATES PATENTS 3.185,!5l 5/1965 Czorny i i n l28/2l4.4
3,572,334 3/l97l Pctterson i i it IZX/ZMA 3,633.57) l/l972 Alley ct til. IZX/ZMA Primary liruminerDalt0n Lv TruluCk Attorney, Agent, or FirmCurtis, Morris & Safford 57] ABSTRACT A device for introducing flexible catheters for intravenous infusions and transfusions consists of a plastic cannula, which is suitable for the puncture of a blood vessel, and which, in its conical attachment, has a divisible catheter guide piece with a conical top. A foil jacket hose is fixed by means of a collet in the groove of the catheter guide piece. Inside the divisible catheter guide piece a suitably cylindrical shaped part of rubber-elastic material is arranged in such a manner, advantageously by means of a flange situated in a corresponding cutout in the catheter-guide piece, that it is not displaced the shaped part having a bore in its pointed top the diameter of which is such that the catheter can be moved therein with low resistance 2 Claims, 1 Drawing Figure DEVICE FOR INTRODUCING FLEXIBLE 'CATIIETERS This invention relates to a device for introducing flexible catheters for intravenous infusions and transfusions, which device consists of a catheterguidepie'c'e and an appliance for clamping or fixing the introduced catheter.
When a flexible catheter, which consists of a hose of plastic material. is introduced upon puncture into a vein, it can often be advanced only intermittently. In order to prevent its sliding back again, it is necessary to fix it intermittently. This necessity may also arise when the catheter is packed under sterile conditions in a thinwalled foil jacket hose which is squeezed together in the form of accordion pleats when the catheter is advanced and which has to be smoothed again by pulling it backwards from time to time. For fixing the catheter when it is introduced intermittently, devices are known which serve both as a catheter guide piece and, at the same time, as clamping device.
In German Offenlegungsschrift No. 2,15 l ,1 19, FIGS. 3 and 4, a clamping device is disclosed which is connected with an extension piece or guide piece which serves to clamp the catheter hose which is then deformed when activating manually a stamp-like clamping knob.
In other clamping devices the catheter is fixed by simple compression with the aid of clamping jaws which are partly half-shell shaped.
The known devices have the drawback that with every movement of the catheter the clamping device must be manually operated and detached again in a complicated manner and that the catheter can be deformed upon too great a pressure which may cause the introduction of the catheter to fail because once a catheter is deformed it no longer can be advanced through the introduction cannula.
It is an object of the present invention to provide a device for introducing flexible catheters for intravenous infusions and transfusions which may be operated in such a manner that the above-mentioned drawbacks are avoided.
This object has been achieved in accordance with the invention by providing a device as a component part of a catheter guide piece which prevents the lateral passive directions of the catheter in both direction by its automatic braking effect. but which allows an active advancement of the catheter.
The accompanying drawing shows a cross section through the device of the invention.
Inside a divisible catheter guide piece 3, of which one half is shown in the drawing and which in connection with a known plastic cannula 2 serves for introducing and guiding a flexible catheter I, a shaped part 7 (having a chamber 6) is fixed which is shown in the embodiment of the drawing and which has been prepared from a rubber elastic material and which advantageously has a cylindrical shape and sits close to the likewise cylindrical chamber 6 of the catheter guide piece 3. The shaped part 7 is held against longitudinal move ments by an integral flange 8 which is tightly fitted in a corresponding or complementary cutout or recess in the catheter guide piece. In its conically tapering top 9 the shaped part 7 has a bore through which the catheter is guided and which is dimensioned in such a manner that the catheter can be moved therein with low resistance. The degree of flexibility of this top 9 in the shaped part 7, which is provided with a bore. is such that upon pulling I or pushing back of the catheter, which fitsin the bore of the shaped part with slight resistance the flexibleinner sides of the bore which are parallel to'the axis of the catheter, are pulled backwards (i.e. downwardly in the drawing) and thus tilt over against the catheter so that an even greater tightening of the top 9 of shaped part 7 to the catheter surface is thus obtained which causes the desired braking effect. By suitably choosing the material for the shaped part 7 and the catheter it is possible to obtain the friction properties being most advantageous for the braking effect. When the catheter is again pushed forward, the tilted top 9 is again drawn into its original position.
Another advantage of the shaped part 7 in the catheter guide piece 3 resides in the fact that blood which flows back after the puncture of a blood vessel in the introduction cannula 2 along the catheter is stopped by the tightly closing shaped part so that it cannot flow into the foil jacket hose 10, which serves for keeping the catheter sterile, and cannot contaminate it.
For keeping the catheter sterile, the surrounding jacket hose 10 may be fixed in the groove 12 of the catheter guide piece 3 by means of a collet 11 to which the jacket hose is glued or welded. Inside the catheter there may be a stiffening mandrel 13.
It is advantageous to provide the elastic shaped part used as catheter brake with a continuous slot in longitudinal direction so that it may be separated from the catheter together with the catheter guide piece 3, which consists of two parts, when the catheter has been introduced.
Until complete introduction of the catheter the two parts of the catheter guide piece 3 are held together because the catheter guide piece is inserted with its top 4 in the conical attachment 5 of the plastic cannula 2 and embraced in its upper part by the collet II in the groove 12.
I claim:
1. A catheter placement unit comprising a plastic cannula adapted to be placed in a blood vessel having an attachment end portion including a generally conically shaped recess formed therein; a divisible catheter guide piece having a longitudinal bore formed therein and first and second end portions; said first end portion being conically shaped for frictional engagement in the conical recess of said cannula; said second end portion of said guide piece having a groove formed therein and a collet mounted in said groove in frictional engagement with said guide piece whereby said collet and the frictional engagement of said first end portion in said conical recess hold the guide piece together; a generally cylindrically shaped elastic element mounted in the bore of said guide piece; said element and guide piece bore having cooperating means for preventing longitudinal movement of said element in said bore, said cooperating means comprising a cooperating recess and flange; said elastic element having an internal bore formed therein and a tapered top portion tapering towards said cannula; and a catheter extending through the bore in said element and said cannula; said catheter having an outside diameter substantially equal to the inside diameter of said bore in the elastic element whereby the catheter can be moved through said element into the cannula with low frictional resistance but movement thereof out of the cannula will be resisted by inward collapse of the tapered top of the elastic elewherein said cooperating means comprises an annular enlargement in the bore of said guide piece defining an annular shoulder therein, and a cooperating annular flange formed on said elastic element.

Claims (2)

1. A catheter placement unit comprising a plastic cannula adapted to be placed in a blood vessel having an attachment end portion including a generally conically shaped recess formed therein; a divisible catheter guide piece having a longitudinal bore formed therein and first and second end portions; said first end portion being conically shaped for frictional engagement in the conical recess of said cannula; said second end portion of said guide piece having a groove formed therein and a collet mounted in said groove in frictional engagement with said guide piece whereby said collet and the frictional engagement of said first end portion in said conical recess hold the guide piece together; a generally cylindrically shaped elastic element mounted in the bore of said guide piece; said element and guide piece bore having cooperating means for preventing longitudinal movement of said element in said bore, said cooperating means comprising a cooperating recess and flange; said elastic element having an internal bore formed therein and a tapered top portion tapering towards said cannula; and a catheter extending through the bore in said element and said cannula; said catheter having an outside diameter substantially equal to the inside diameter of said bore in the elastic element whereby the catheter can be moved through said element into the cannula with low frictional resistance but movement thereof out of the cannula will be resisted by inward collapse of the tapered top of the elastic element upon outward movement of the catheter and wherein said elastic element has a longitudinally extending slit formed therein to permit removal thereof from said catheter after placement of the catheter.
2. A catheter placement unit as defined in claim 1 wherein said cooperating means comprises an annular enlargement in the bore of said guide piece defining an annular shoulder therein, and a cooperating annular flange formed on said elastic element.
US436798A 1973-02-06 1974-01-25 Device for introducing flexible catheters Expired - Lifetime US3903885A (en)

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Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4096860A (en) * 1975-10-08 1978-06-27 Mclaughlin William F Dual flow encatheter
US4274408A (en) * 1979-03-26 1981-06-23 Beatrice Nimrod Method for guide-wire placement and novel syringe therefor
WO1981001795A1 (en) * 1979-12-26 1981-07-09 Sherwood Medical Ind Inc Injectable catheter and method of placing same
US4299226A (en) * 1979-08-08 1981-11-10 Banka Vidya S Coronary dilation method
US4327709A (en) * 1978-03-06 1982-05-04 Datascope Corp. Apparatus and method for the percutaneous introduction of intra-aortic balloons into the human body
FR2522508A1 (en) * 1981-11-05 1983-09-09 Arrow Int Inc KIT FOR THE INTRODUCTION OF CATHETERS
US4409990A (en) * 1981-10-13 1983-10-18 Mileikowsky Gil N Fluid sampling needle assembly and method of use thereof
EP0145149A1 (en) * 1983-09-30 1985-06-19 Sherwood Medical Company Catheter placement device
US4525157A (en) * 1983-07-28 1985-06-25 Manresa, Inc. Closed system catheter with guide wire
US4636199A (en) * 1984-07-09 1987-01-13 Victor Lyle D Device for inserting a catheter within the intercostal space
US4650472A (en) * 1985-08-30 1987-03-17 Cook, Incorporated Apparatus and method for effecting percutaneous catheterization of a blood vessel using a small gauge introducer needle
US4652256A (en) * 1985-10-29 1987-03-24 Manresa, Inc. Closed system catheter with guide wire
US4662870A (en) * 1985-07-15 1987-05-05 Augustine Scott D Needle penetration indicator and guide
US4968308A (en) * 1988-06-14 1990-11-06 B. Braun Melsungen Ag Coupling assembly
US5507728A (en) * 1993-09-30 1996-04-16 Erskine; Timothy J. Peristaltic interlumenar device advances
US5676656A (en) * 1995-03-16 1997-10-14 Becton Dickinson And Company Control forward introducer needle and catheter assembly
JP2003503164A (en) * 1999-07-06 2003-01-28 データスコープ・インベストメント・コーポレイション Universal protective catheter sleeve
US20060258987A1 (en) * 2005-05-10 2006-11-16 Cook Incorporated Catheter stiffening member
US20080183141A1 (en) * 2007-01-26 2008-07-31 Matthew Dickson Reavill Long catheter infusion insertion method and apparatus
US7803142B2 (en) 2005-02-02 2010-09-28 Summit Access Llc Microtaper needle and method of use

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DK151085B (en) * 1976-04-15 1987-11-02 Stefan O Tauschinski CANNEL FOR INTRODUCING A FLEXIBLE CATHETTE IN A BLOODLINE
DE3050812C2 (en) * 1980-12-23 1985-03-21 B. Braun Melsungen Ag, 3508 Melsungen Catheterization device
DE3048774C2 (en) * 1980-12-23 1984-03-08 B. Braun Melsungen Ag, 3508 Melsungen Catheterization device
DE3100547C2 (en) * 1981-01-10 1985-06-05 B. Braun Melsungen Ag, 3508 Melsungen Catheter set
DE3100545C2 (en) * 1981-01-10 1983-12-29 B. Braun Melsungen Ag, 3508 Melsungen "Catheter set"
DE3221244C2 (en) * 1982-06-04 1985-07-18 B. Braun Melsungen Ag, 3508 Melsungen Device for introducing an elongated object, in particular a catheter, a probe or the like, into a body cavity
DE3245909A1 (en) * 1982-12-11 1984-06-14 Transcodan Sven Husted-Andersen GmbH & Co KG, 2432 Lensahn Vein catheter
JPS6145774A (en) * 1984-08-07 1986-03-05 テルモ株式会社 Medical instrument
EP0361548A3 (en) * 1984-08-07 1990-06-20 TERUMO KABUSHIKI KAISHA trading as TERUMO CORPORATION Catheter introducer device
ATE39845T1 (en) * 1984-12-14 1989-01-15 Braun Melsungen Ag PUNCTURE AND INTRODUCTION SET.
DE3721288C1 (en) * 1987-06-27 1989-06-22 Sterimed Gmbh Sealing cuff for a catheter
DE4040620A1 (en) * 1990-01-24 1991-07-25 Dimitrov Pentcho Hypodermic syringe for axially inserted catheter - has ratchet preventing return movement of retracted hollow plunger
DE4429150C2 (en) * 1994-08-17 1999-07-08 Braun Melsungen Ag Catheter introducer
DE19714572C1 (en) 1997-04-09 1998-06-25 Haindl Hans Catheter for measuring chemical parameters in biological tissue
DE19725680C2 (en) * 1997-06-18 2000-04-06 Hans Haindl Funnel-shaped cannula arrangement for catheter insertion

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3185151A (en) * 1962-06-19 1965-05-25 Sorenson Res Corp Catheter placement unit
US3572334A (en) * 1968-11-27 1971-03-23 Johnson & Johnson Intravenous catheter placement unit
US3633579A (en) * 1967-05-24 1972-01-11 Sherwood Medical Ind Inc Catheter placement device and method
US3757771A (en) * 1972-01-10 1973-09-11 Biophysics Corp Int Sterile inserter apparatus
US3811440A (en) * 1971-08-09 1974-05-21 Deseret Pharma Catheter placement unit with pressure closure
US3825001A (en) * 1972-12-05 1974-07-23 Johnson & Johnson Catheter placement unit

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3185151A (en) * 1962-06-19 1965-05-25 Sorenson Res Corp Catheter placement unit
US3633579A (en) * 1967-05-24 1972-01-11 Sherwood Medical Ind Inc Catheter placement device and method
US3572334A (en) * 1968-11-27 1971-03-23 Johnson & Johnson Intravenous catheter placement unit
US3811440A (en) * 1971-08-09 1974-05-21 Deseret Pharma Catheter placement unit with pressure closure
US3757771A (en) * 1972-01-10 1973-09-11 Biophysics Corp Int Sterile inserter apparatus
US3825001A (en) * 1972-12-05 1974-07-23 Johnson & Johnson Catheter placement unit

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4096860A (en) * 1975-10-08 1978-06-27 Mclaughlin William F Dual flow encatheter
US4327709A (en) * 1978-03-06 1982-05-04 Datascope Corp. Apparatus and method for the percutaneous introduction of intra-aortic balloons into the human body
US4274408A (en) * 1979-03-26 1981-06-23 Beatrice Nimrod Method for guide-wire placement and novel syringe therefor
US4299226A (en) * 1979-08-08 1981-11-10 Banka Vidya S Coronary dilation method
WO1981001795A1 (en) * 1979-12-26 1981-07-09 Sherwood Medical Ind Inc Injectable catheter and method of placing same
US4409990A (en) * 1981-10-13 1983-10-18 Mileikowsky Gil N Fluid sampling needle assembly and method of use thereof
FR2522508A1 (en) * 1981-11-05 1983-09-09 Arrow Int Inc KIT FOR THE INTRODUCTION OF CATHETERS
EP0093164A1 (en) * 1981-11-05 1983-11-09 Arrow Int Inc Catheter introduction set.
EP0093164A4 (en) * 1981-11-05 1985-06-10 Arrow Int Inc Catheter introduction set.
US4525157A (en) * 1983-07-28 1985-06-25 Manresa, Inc. Closed system catheter with guide wire
EP0145149A1 (en) * 1983-09-30 1985-06-19 Sherwood Medical Company Catheter placement device
US4613329A (en) * 1983-09-30 1986-09-23 Sherwood Medical Company Catheter placement device
US4636199A (en) * 1984-07-09 1987-01-13 Victor Lyle D Device for inserting a catheter within the intercostal space
US4662870A (en) * 1985-07-15 1987-05-05 Augustine Scott D Needle penetration indicator and guide
US4650472A (en) * 1985-08-30 1987-03-17 Cook, Incorporated Apparatus and method for effecting percutaneous catheterization of a blood vessel using a small gauge introducer needle
US4652256A (en) * 1985-10-29 1987-03-24 Manresa, Inc. Closed system catheter with guide wire
US4968308A (en) * 1988-06-14 1990-11-06 B. Braun Melsungen Ag Coupling assembly
US5507728A (en) * 1993-09-30 1996-04-16 Erskine; Timothy J. Peristaltic interlumenar device advances
US5676656A (en) * 1995-03-16 1997-10-14 Becton Dickinson And Company Control forward introducer needle and catheter assembly
JP2003503164A (en) * 1999-07-06 2003-01-28 データスコープ・インベストメント・コーポレイション Universal protective catheter sleeve
US7803142B2 (en) 2005-02-02 2010-09-28 Summit Access Llc Microtaper needle and method of use
US20060258987A1 (en) * 2005-05-10 2006-11-16 Cook Incorporated Catheter stiffening member
US20080183141A1 (en) * 2007-01-26 2008-07-31 Matthew Dickson Reavill Long catheter infusion insertion method and apparatus
US8231601B2 (en) * 2007-01-26 2012-07-31 Matthew Dickson Reavill Long catheter infusion insertion method and apparatus
US9925356B2 (en) 2007-01-26 2018-03-27 Matthew Dickson Reavill Long catheter infusion insertion method and apparatus

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DE2305640C3 (en) 1975-08-14
DE2305640A1 (en) 1974-08-15
DE2305640B2 (en) 1975-01-09

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