CA1061479A - X-ray apparatus comprising a balanced x-ray source which is displaceable in one plane - Google Patents

X-ray apparatus comprising a balanced x-ray source which is displaceable in one plane

Info

Publication number
CA1061479A
CA1061479A CA258,898A CA258898A CA1061479A CA 1061479 A CA1061479 A CA 1061479A CA 258898 A CA258898 A CA 258898A CA 1061479 A CA1061479 A CA 1061479A
Authority
CA
Canada
Prior art keywords
rod
supporting
coupling
supporting rod
pivot
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
CA258,898A
Other languages
French (fr)
Inventor
Walter Schmedemann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
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
Application filed by Philips Gloeilampenfabrieken NV filed Critical Philips Gloeilampenfabrieken NV
Application granted granted Critical
Publication of CA1061479A publication Critical patent/CA1061479A/en
Expired legal-status Critical Current

Links

Classifications

    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B6/00Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
    • A61B6/44Constructional features of apparatus for radiation diagnosis
    • A61B6/4429Constructional features of apparatus for radiation diagnosis related to the mounting of source units and detector units
    • A61B6/447Constructional features of apparatus for radiation diagnosis related to the mounting of source units and detector units the source unit or the detector unit being mounted to counterpoise or springs

Abstract

ABSTRACT

Apparatus comprising a parallelogram which is mov-able in one plane and which is formed by a first and a second coupling rod and a part of a first and a second supporting rod for an X-ray source or other device and a counterweight, respectively the coupling rods are pivotably connected near one end to the first supporting rod and are pivotably con-nected to the second supporting rod near their other ant.
The parallelogram is pivotable about a stationary shaft which extends perpendicularly to the plane of movement.
This shaft is situated between the two pivots of a coupling rod. The apparatus on accordance with the invention reduces the risk of a patient being clamped by the parallelogram.

Description

~061479 The invention relates to an X-ray apparatus comprising an X-ray source which is displaceable in one plane and which is connected to a first supporting rod, and also comprising a counterweight which is connected to a second supporting rod, the two supporting rods being interconnected by way of a first and a second coupling rod which form a parallelogram in conjunction with the supporting rods, the said parallelogram being pivotable about a stationary shaft which extends perpendicularly to the plane of movement of the X-ray source.
In a known X-ray apparatus of the kind set forth, the stationary pivot shaft is situated in a corner point of the pivotable parallelogram. The supporting rods of X-ray source and counterweight are pivotably coupled to each other at the corner point of the parallelogram diametrically opposite the said corner point.
The known X-ray apparatus has a drawback in that the dimensions of the parallelogram must be comparatively large to prevent the counterweight from having to be inadmissibly heavy or the range of movement of the X-ray
- 2 -PIID 75~119 10~1479 source from beiI~g substantially limited. Comparatively large dimensions of the sides of the parallelogram, however, increase the risk of a patient being clamped in the parallelogram. Enclosure of the parallelogram in order to obtain a closed construction leads to an undesired increase in the weight of an apparatus in the case of comparatively large parallelograms.
The invention has for its object to provide an X-ray apparatus in which the weight~ratio of X-ray source and counterweight is in principle independent of the length nf the supporting rods which forms part of the paralle~ogram, so that a comparatively small parallelogram is feasible.
To this end, an X-ray appara~tus in accordance with tha invention is characterized in that the two coupling rods are pivotably connected near one end to the first supporting rod ane' are pivotably connected to the second supporting rod near their other end, the stationary pivot shaft of the paral]elogram being situated between the two ends of one of the coupling rods.
Because the stationary pivot shaft of the parallelogram is situated between the ends of a coupling rod and because each coupling rod constitutes a direct link between the two-supporting rods, the length of the
3-7-1976 10~1479 supporting rods whicll forms part of the parallelogram is of no importance in the balance equation obtained when the balance of moments of the force.s of weight of X-ray source and counterweight is taken around the stationary pivot shaft.
This means that the parallelogram can be reduced in comparison with the known X-ray apparatus, so that the risk of clamping is eliminated. Moreover, the parallelogram can be designed as a closed construction without giving rise to an undesired weight increase.
A special embodiment of an X-ray apparatus in accordance with the invention is characterized in that - the coupling rod which is pivotable about the stationary shaft has a hollow profile wherethrough the other coupling rod extends.
The invention will be described in detail hereinafter with reference to the drawing.
Fig. 1 is a perspective view of a preferred embodiment of an X-ray apparatus in accordance with the invention.
Fig. 2 diagrammatically shows the X-ray apparatus of Fig. 1.
Fig. 3 shows the X-ray apparatus -o Figs. 1 and 2, the counterweight being sho~ in more detail.

-h-The embodiment shown in Fig. 1 concerns an X-ray apparatus for dental examination. The invention is applic-able, however, to any apparatus in which a parallelogram is used in conjunction with a manually displaceable, counter-bal-anced X-ray source and/or other fluoroscopy or examination and/or treatment device, for example, for the displacement mechanism of a dental drill. The apparatus comprises a hous-ing 1 which is provided on the front with a seat 2 and a back rest 3 for a patient. Behind the back rest 3 there is provided a head rest 4 whose height can be adjusted. The X-ray source 9 comprises an X-ray source having a hollow anode 10, and also comprises a grip 11 by means of which the X-ray source can be moved and by which an electromagnetic brake (not shown) for arresting the X-ray source in an arbitrary position can be operated. The X-ray source 9 is rotatable about a shaft 8 mounted on a first supporting rod 7. The first sup-porting rod 7 is pivotable about a shaft 6 provided on a first coupling rod 5. The coupling rod 5 is pivotable about a stationary pivot shaft 12 secured in the housing 1. Near its end which is remote from the pivot shaft 6, the coupling rod 5 is pivotably connected (at 13) to a second supporting rod 19 which is provided with a counterweight 17.

P~ 75-119 ~061479 The rods 5 and 7 are situated in a vertieal ~lane of movement which extends perpendicularly to a symmetry plane defined by the patient chair 2, the back rest 3 and the head rest 4. The shafts 6, 8, 12 and 13 are perpendicu]ar to this plane of movement.
The first coupling rod 5 and the first supporting rod 7 have a hollow profile so that through these rods a cable can be passed from the housing powering t,he X-ray source 9. One end of a second coupling rod 16 is pivotably secured (at 14) to the end of the supporting rod 7 which is remote from the X-ray source 9. The other end of the second coupling rod 16 is pivotably cpnnected ~at 15) to the rod 19 which supports the counterweight 17. The pivots 14 and 15 are situated~so that the coupling rod 16 ~xtends parallel to the first coupling rod. The supporting rods 7 a~d 19 are parailel to each other. The distance between the pivots 14 and 15 equals the distance between the pivots 6 and 13, so that a parallelogram is formed by the coupling rods 5 and 16 and the supporting rods 7 and 19.
During movement of the X-ray source 9, the counter-weight 17 describes a traject, due to the action of the parallelogram, which corresponds to the traject of the X-ra~ source . The rati,o between the distances completed by . PllD 75-119 the'X-ray source on the one side and by the counterweight on the other side is 'dependent of the position of the pivot shaft 12 on the first coupling rod 5 and also on the length of the first supporting rod 7 (between the shafts 6 and 8) relati-ve to the length of the second supporting rod 19 between the shaft 13 and the point at which the counterweight 17 acts.
For limiting the moveme,nt of the X-ray source, use can be made of a template 18 (denoted by stroke-dot lines in Fig. 2) which is mounted in the housing 1 and which is engaged by a follower pin (not shown) which is mounted on the supporting rod 19. Furthermore~
electromagnetic braking of the X-ray ~source in an arbitrary position within the range of movement defined by the template 18 can be realized by mounting electromagnets on the rod 19, the s~lid electromagnets cooperating with a~rtion of the housing which is magnetically conductive at least intnis range. The template 18 can be secured in the housing by means of a damping material in order to reduce the risk of vibration.
Accurate weight compensation can be effected as follo~s.
First, the first supporting rod 7 is placed in a .
10~;1479 veltical position-and the first coupling rod 5 is placed in a`~rizontal pOsi-tioIl (Fig. 3). The counterweight 17 is chosen so that the first coupling rod 5 is in a state of equilibrium. If the X-ray source subsequent]y tends to move the left or the right aIIyl~ray~ tare plates 17a a~d 17b, detachably inGluded in the counterweight 17, can be moved so that a state of equtlibrium is reached.
Subsequently, the first supporting rod 7 and the first coupling rod 5 are placed in an inclined position.
The counterueight 17, being displaceable on the rod 19 by way of a slidable clamping device 21 (not elaborated for the sake of simplicity), is shifted so that a state of equilibrium is obtained also in this inclined position.
~ .

Claims (4)

THE EMBODIMENTS OF THE INVENTION IN WHICH AN EXCLUSIVE
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. Apparatus for mechanically supporting a medical device at any position in a plane, comprising:
a first supporting rod for pivotably supporting a medical device at a first pivot point along said rod;
a first coupling rod pivotably connected to said first supporting rod at a second pivot point along said first supporting rod;
A second coupling rod parallel to said first coupling rod and pivotably connected to said first supporting rod at a third pivot point between said first and second pivot points;
a counterweight a second supporting rod supporting said counterweight at a fourth point along said second supporting rod, said second supporting rod being parallel to said first sup-porting rod and pivotably connected to said first and second coupling rods at fifth and sixth pivot points respectively, said fifth pivot point being between said fourth and sixth points, said second, third, fifth and sixth pivot points defining a parallelogram; and a pivot shaft perpendicular to the plane of the parallel-ogram and supporting one of said coupling rods at a balance point between the pivot connections thereof with said first and second supporting rods.
2. Apparatus as claimed in Claim 1, characterized in that the coupling rod which is pivotable about the pivot shaft has a hollow profile wherethrough the other coupling rod extends.
3. Apparatus as claimed in Claim 1 or 2, character-ized in that the supporting rod pivots of the coupling rod, which is pivotable about the pivot shaft, are situated just outside the profile of this coupling rod on the side facing the X-ray source.
4. Apparatus as claimed in Claim 1, characterized in that the counterweight is slidably arranged on the relevant supporting rod.
CA258,898A 1975-08-13 1976-08-11 X-ray apparatus comprising a balanced x-ray source which is displaceable in one plane Expired CA1061479A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2536081A DE2536081C3 (en) 1975-08-13 1975-08-13 Support arrangement for an X-ray tracer of an X-ray device guided in a predetermined plane

Publications (1)

Publication Number Publication Date
CA1061479A true CA1061479A (en) 1979-08-28

Family

ID=5953897

Family Applications (1)

Application Number Title Priority Date Filing Date
CA258,898A Expired CA1061479A (en) 1975-08-13 1976-08-11 X-ray apparatus comprising a balanced x-ray source which is displaceable in one plane

Country Status (9)

Country Link
US (1) US4101779A (en)
JP (1) JPS5222891A (en)
BE (1) BE845085A (en)
CA (1) CA1061479A (en)
DE (1) DE2536081C3 (en)
FR (1) FR2320723A1 (en)
GB (1) GB1557730A (en)
IT (1) IT1062660B (en)
SE (1) SE411506B (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL8102616A (en) * 1981-05-29 1982-12-16 Philips Nv GAMMATOMOGRAPH WITH PARALLELOGRAM SUSPENSION.
SE8902831D0 (en) * 1989-08-25 1989-08-25 Siemens Elema Ab VIKTUTJAEMNINGSANORDNING
JP4270889B2 (en) * 2003-01-15 2009-06-03 オリンパス株式会社 Medical instrument holding device
KR102366600B1 (en) * 2014-01-23 2022-02-24 주식회사 바텍 X-ray photographing device comprising variable type arm

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2156170A (en) * 1939-04-25 Apparatus for making radiographs
US2167115A (en) * 1937-09-10 1939-07-25 Kieffer Jean Radiation method and apparatus
DE939348C (en) * 1951-11-03 1956-02-23 Mueller C H F Ag Mounting device especially for X-ray tubes
US3134340A (en) * 1962-09-17 1964-05-26 Eutech Corp Balancer assembly
FR1436139A (en) * 1965-03-30 1966-04-22 Conco Engineering Works Balancing device for lifting device
JPS509637B1 (en) * 1970-09-17 1975-04-14
JPS5439918Y2 (en) * 1972-01-31 1979-11-26
FR2270756B1 (en) * 1974-05-08 1981-07-24 Philips Massiot Mat Medic
BE831520A (en) * 1975-07-18 1975-11-17 LOAD HANDLING EQUIPMENT

Also Published As

Publication number Publication date
SE411506B (en) 1979-12-27
DE2536081C3 (en) 1980-04-10
BE845085A (en) 1977-02-11
IT1062660B (en) 1984-10-20
DE2536081B2 (en) 1979-08-09
JPS5222891A (en) 1977-02-21
FR2320723A1 (en) 1977-03-11
JPS5628535B2 (en) 1981-07-02
US4101779A (en) 1978-07-18
SE7608898L (en) 1977-02-14
FR2320723B1 (en) 1982-08-13
GB1557730A (en) 1979-12-12
DE2536081A1 (en) 1977-02-17

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