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Publication numberUS2624013 A
Publication typeGrant
Publication dateDec 30, 1952
Filing dateMay 27, 1949
Priority dateMay 27, 1949
Publication numberUS 2624013 A, US 2624013A, US-A-2624013, US2624013 A, US2624013A
InventorsHirsch Marks
Original AssigneeHirsch Marks
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
X-ray therapy grid
US 2624013 A
Abstract  available in
Previous page
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Claims  available in
Description  (OCR text may contain errors)

Dec. 30, 1952 H. MARKS X-RAY THERAPY GRID Filed May 27. 1949 INVENTOR. 17 211071 flwrif Patented Dec. 30, 1952 UNITED STATES TENT OFFICE X-RAY THERAPY GRHD Hirsch Marks, New York, N. Y.

Application May 27,1949, Serial No. 95,640

2 Claims.

This invention relates to X-ray treatment of malignant tumors, and more particularly to means for the protection of the skin and the underlying normal tissues in the irradiated area from the harmful effects of excessive irradiation, without obstruction of the attainment of an adequate dose of radiation in the deeper lying tumor proper.

In the X-ray treatment of tumors, especially of those of large volume, the excessive absorption of backscatter in the intervening normal tissues hinders the attainment of an adequate dose in the tumor proper because large fields, for physiological reasons, limit normal tissue tolerance, the first impact of the X-rays being on the skin and the underlying normal tissues which would have to be subjected to a harmful overdose of radiation if the malignant process itself is to be reached with an adequate, effective dose of radiation.

The object of the invention is to provide means for the protection of the skin and the underlying normal tissues from the harmful effects of excessive irradiation; a further object of the invention is to provide means to permit longer exposure and exposure of larger areas without harming surface tissues; another object is to permit the reaching of larger or deeper lying tumors with larger doses of radiation than has been possible heretofore because of limited normal tissue tolerance.

The construction of the invention will be apparent from the following specification when considered together with the accompanying drawing, in which:

Fig. 1 is a top view of the invention;

Fig. 2 is a side view of the invention shown in Fig. 1, parts being broken away to show the structure more clearly;

Fig. 3 is another construction embodying the invention;

Fig. 4 is still another the invention.

As shown in Figs. 1 and 2, my invention consists of a sheet or web of metal I, covered on one or preferably both sides with rubber or some other plastic material 2, with a number of openconstruction, embodying .ings 3 arranged in a regular or irregular pattern. In the preferred solution shown in Fig. 1 these openings are arranged in a checker-board pattern, each opening being a square the sides of which are preferably between inch and 1 inch.

As shown, however, in Figs. 3 and 4, the shape of the openings can take other forms, such as circular, oval, and they can be arranged in different, or irregular patterns, depending on the shape and area to be irradiated.

The invention shown serves as a grid to be interposed between the source of X-ray radiation and the tumor to be treated, on the surface of the body of the patient. The layer of lead,

or other metal, lowers the intensity of the beam,

acting at the same time also as filter, absorbing the soft rays in much greater proportion than the hard rays. The skin and normal tissues under the grid thus are safeguarded from over irradiation. Thus, where the irradiation of a surface of 5" by 5" is required, instead of irradiating the entire 25 square inch surface, by applying the grid invented, the actual skin surface exposed would be reduced by approximately 60% to only 10 square inches. Between the number of relatively small skin surfaces directly exposed there would remain an interconnected pattern of unexposed skin surface practically unaffected by radiation. These smaller skin surfaces can easily stand a substantial increase in exposure time without such harmful effects as if the entire, unbroken surface were to be exposed. In the deeper layers, however, especially in the malignant tissues the mechanism of absorption is mainly by recoil electrons, and with the increased exposure time the irradiation will be fully effective.

My invention thus renders possible to reach the malignant tumor across the barrier of the skin and normal tissues with great intensity and yet safeguard to a great extent the normal tissues from the harmful effects of excessive radiation.

I claim, as my invention:

1. A medical instrument for X-ray treatments of the type described, consisting of a layer of lead embedded between two layers of rubber and having a plurality of square openings arranged in alternating order.

2. The method of therapeutical irradiation by X-rays whereby the body surface to be irradiated is subdivided into a plurality of smaller surfaces simultaneously exposed to radiation, said smaller surfaces being surrounded by an interconnected pattern of skin surface shielded from said radiation.


REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,580,857 Richards Apr. 13, 1926 1,607,140 Wappler Nov. 16, 1926 1,609,222 Taylor Nov. 30, 1926 1,748,403 Wentworth Feb. 25, 1930 1,929,177 Nelson Oct. 3, 1933 2,003,752 Landt June 4, 1935 2,145,686 Dessauer Jan. 31, 1939 2,186,203 Centeno Jan. 9, 1940 2,216,326 Smith Oct. 1, 1940 2,494,664 Lubow Jan. 17, 1950 OTHER REFERENCES Applied X-rays, G. L. Clark, 1940 edition, page 225. (Copy in Patent Oflice Library.)

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Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2820131 *Aug 1, 1951Jan 14, 1958Sprague Electric CoCuring oven
US2938374 *Jun 24, 1957May 31, 1960Case Donald PProtection of combination locks against entry by radiography
US3056024 *Dec 2, 1959Sep 25, 1962High Voltage Engineering CorpApparatus for irradiating matter with high energy electrons
US4260670 *Jul 12, 1979Apr 7, 1981Western Electric Company, Inc.X-ray mask
US4288697 *May 3, 1979Sep 8, 1981Albert Richard DLaminate radiation collimator
US4301237 *Sep 29, 1980Nov 17, 1981Western Electric Co., Inc.Method for exposing substrates to X-rays
US4465540 *Apr 6, 1981Aug 14, 1984Albert Richard DMethod of manufacture of laminate radiation collimator
US5339347 *Apr 27, 1993Aug 16, 1994The United States Of America As Represented By The United States Department Of EnergyMethod for microbeam radiation therapy
US5771270 *Mar 7, 1997Jun 23, 1998Archer; David W.Collimator for producing an array of microbeams
US6052436 *Jul 15, 1998Apr 18, 2000Bionix Development CorporationRadiation therapy device employing cam pin and cam groove guiding system for controlling movement of linear multi-leaf collimator leaves
US7835492Nov 27, 2007Nov 16, 2010Velayudhan SahadevanLethal and sublethal damage repair inhibiting image guided simultaneous all field divergent and pencil beam photon and electron radiation therapy and radiosurgery
US8139714Jun 25, 2009Mar 20, 2012Velayudhan SahadevanFew seconds beam on time, breathing synchronized image guided all fields simultaneous radiation therapy combined with hyperthermia
U.S. Classification378/65, 976/DIG.429, 378/147, 378/35
International ClassificationG21K1/02
Cooperative ClassificationG21K1/025
European ClassificationG21K1/02B