JPH024646Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a head fixation device for fixing the head of a subject during radiography.

The head fixator used in conventional radiography has a small displacement angle and cannot image the entire head in one go. For example, when imaging the front and back of the head, first There was the inconvenience of having to change the subject's body position and photograph the back of the head after performing the procedure.

The present invention provides a head fixation device that allows a required head image to be taken in one shot without changing the subject's body position.

That is, the head fixator for radiography of the present invention has a gutter-like member supporting the head of the subject supported by a pair of support arms on both sides of one end thereof,
The support arm is attached to a removable attachment plate on the bed on which the subject lies so that the attachment angle can be varied, and the gutter-like member can be attached to the support arm at a variable attachment angle and its fulcrum position can be displaced. It is composed of

A pair of engagement guide plates each having an arc-shaped slot are fixed to both sides of one end of the gutter-like member, and each of the pair of support arms has a defined gap between the inner and outer plates, respectively. Both engagement guide plates of the gutter-like member are slidably inserted into the gaps between the support arms.

A threaded rod is protruded from the inner surface of the inner plate of the inner and outer side plates of each support arm, and this threaded rod passes through the arc-shaped slot of the engagement guide plate inserted into the gap between the above-mentioned side plates. It protrudes through a through hole provided in the outer plate of the arm. A fixing screw is screwed into each threaded rod from this protruding end, and by tightening the fixing screw, the engagement guide plate, and thus the gutter-shaped member, are fixedly held at a predetermined displacement position on the support arm.

The illustrated embodiment will be described in detail below.

The proposed head fixator consists of a mounting plate A for mounting the device on a bed D, a pair of support arms B whose mounting angle is variable with respect to the mounting plate A, and this support arm B.
It consists of a head holding part C whose mounting angle is variable relative to the head holding part C.

The elements constituting these members A to C are made of a material that does not absorb radiation, for example, a synthetic resin such as acrylic resin or Delrin resin.

Attach the mounting plate A to the bed D on which the patient lies with 1 screw.
It is removably screwed on. A pair of support blocks 2 are fixed to the mounting plate A with a predetermined gap left and right, and are provided with screw holes 2'.

A support arm B is attached to each support block 2 with a screw 4 so that the attachment angle can be changed.
The structures of the left and right support arms B are symmetrical, and the mounting method to the block 2 is the same, so only one side will be described.

Reference numerals 5 and 6 denote an outer plate and an inner plate constituting the support arm B, which are connected by a curved end plate 8 with an arcuate gap 7 in between (FIG. 3). Reference numeral 9 is a connection part for connecting support arm B to support block 2 of mounting plate A. Loosely insert screw 4 into hole 9'.
The male threaded part 4' is screwed into the female threaded hole 2' of the block 2, and the connecting part 9 of the support arm B is pressed against the support block 2 of the mounting plate A by the stepped part 4' and fixed. Block 2 of arm B by loosening screw 4.
Therefore, the angle with respect to the mounting plate A can be changed.

The head holding section C consists of a gutter-like member 10 that supports the head H of the subject, and a pair of left and right half-moon-shaped engagement guide plates 11 fixedly attached to both sides 10' of one end of the gutter-like member 10. The structure of these pair of engagement guide plates 11 is also symmetrical,
Furthermore, since the mounting method for each support arm B is the same, only one side will be described.

12 is an engagement guide plate (hereinafter simply referred to as a guide plate) 1
The guide plate 11 is placed in the gap 7 of the support arm B, and the guide plate 11 is placed in the gap 7 of the support arm B, and the guide plate 11 is placed in the gap 7 of the support arm B.
The guide plate 11 is slidably held by the guide plate 5.
Reference numeral 6' denotes an engaging protrusion provided along the arc edge of the inner plate 6 of the support arm B, and the corresponding groove 13 of the guide plate 11
Fits in.

14 is a threaded rod protruding from the inner surface of the inner plate 6;
It traverses the gap 7 and passes through a through hole 5' provided in the outer plate 5. Therefore, when the guide plate 11 of the gutter-like member 10 of the head fixing part is placed between the inner and outer plates 6 and 5 of the support arm B, the screw 14 will be loosely inserted through the circular arc slot 12 of the guide plate 11. .

Reference numeral 15 denotes a fixing screw, and the shaft 15' is loosely inserted into the hole 5' of the outer plate 5 of the support arm B, and the fixing screw 14 is screwed into the female threaded hole of the shaft 15'.
The guide plate 11 and hence the trough-like member 10 are fixed to the support arm B by pressing the vicinity of the edge of the slot 12 of the guide plate 11 (FIG. 1).

Loosen the screw 15 and slide the guide plate 11 within the gap 7 between the side plates 5 and 6 of the support arm B, and at that position, tilt the gutter-like member 10 together with the guide plate 11 about the threaded rod 14 (fulcrum). By tightening the screw 15 in the desired tilted position, the trough-like member 10 can be fixed to the support arm B in that position.

When the screw 15 is loosened and the guide plate 11 is slid against the side plates 5 and 6 of the support arm B, the threaded rod 14
(the fulcrum) is displaced relative to the support arm B within the slot 12, and thus the fulcrum of the trough-like member 10 relative to the support arm B is displaced.

As described above, according to the present invention, the support arm B
has a variable inclination angle with respect to the mounting plate A, and the fulcrum position can be displaced, so as shown in FIGS. 5 and 6, the displacement and inclination angle range of the head fixing part C is large, and Fine adjustment is possible, and in particular, it is possible to adjust the position vertically and horizontally while keeping the angle of the head constant (for example, while holding the head fixing part in a horizontal position as shown in Figure 7). It can accommodate a wide range of changes in the length of the subject's neck and body position, and can effectively perform desired imaging.

[Brief explanation of the drawing]

Figure 1 is a front view of the first embodiment of the present invention, with the left half shown as the second embodiment.
Fig. 2 is a right side view of Fig. 1, Fig. 3 is a perspective view of the support arm, Fig. 4 is a perspective view of the guide plate of the head fixing section, Fig. 5, Fig. 6 and 7 are side views showing the head fixing part at different positions. A...Mounting plate, B...Support arm, C...Head fixation part, D...Bed.

Claims (1)

[Claims for Utility Model Registration] A gutter-like member that supports the subject's head; a pair of engaging guide plates fixedly installed on both sides of one end of the gutter-like member, each having an arc-shaped slot; a pair of support arms each having an inner and outer side plate defining a gap in which each of the pair of engagement guide plates is slidably disposed; a pair of threaded rods projecting through the arcuate slots of each of the engagement guide plates disposed in the gaps between the arms and through holes provided in the outer plate of each of the support arms; a pair of fixing screws that are screwed together and tighten and hold the engagement guide plate at a desired position between the inner and outer side plates of each support arm; 1. A head fixator for radiography, comprising: a mounting plate to which a support arm is attached at its base end in a variable mounting angle;