JPS60165568A - Collimator exchanging mechanism for nuclear medical device - Google Patents

Abstract

PURPOSE:To perform easily and quickly an exchanging operation and to permit easy positioning without the possibility of dislodging by providing the 1st screw part, 2nd screw part and 3rd screw part and attaching and detaching a collimator by rotating a nut. CONSTITUTION:When a nut driver 13 is rotated in a right-hand screw direction, the 2nd screw part 10a of a nut 10 rotates while screwing to the 1st screw part 10b of a stay 1A and therefore the nut 10 advanced downward and the bottom end face thereof contacts with the top end of the screw part 15b of a bolt 15. When the rotating operation of the driver 13 is continued, the nut 10 advances further downward and is pushed into an embedding hole 14. The 3rd screw part 11 is meshed with the screw part 15b where the downward advance of the nut 10 and bolt 15 progresses to some extent. The bolt 15 is at the same time energized upward by a coil spring 16 and only the nut 10 advances downward. As a result, the 2nd screw part 10a is detached from the 1st screw part 10b of the stay 1A and the 3rd screw part 11a is meshed with the screw part 15b of the bolt 15.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a collimator exchange am for a nuclear medicine apparatus.

[Technical background of invention and its problems]

In nuclear medicine apparatuses, a collimator for extracting only the perpendicular component of gamma rays emitted from a subject to a detector is replaced.

A conventional example of a collimator exchange mechanism for performing such work is shown in FIG.

This figure shows a collimator exchange mechanism for once removing the collimator 2 from the exchange trolley 1 and attaching it to the detector 3. When removing the collimator 2 from the exchange trolley 1, the collimator is inserted through the exchange trolley 1. It is necessary to loosen the four setscrews 5 screwed into 2.

When attaching the collimator 2 removed from the exchange cart 1 to the detector 3, the four attachment screws 4 are passed through the extraction holes 6 of the collimator 2 and screwed into the female screws 7 provided on the detector 3, and then tightened. This is necessary.

However, in the collimator exchange mechanism described above, the work of removing the collimator 2 from the exchange cart 1 and the work of removing the collimator 2 from the exchange cart 1 are difficult.
It is necessary to take the screws into the detector 3, and therefore a total of eight screw operations are required, which is extremely complicated.

Further, there is a risk that the collimator 2 may fall off due to forgetting to tighten the mounting screw 4, and there is a problem that positioning the collimator with respect to the detector 3 takes time.

[Purpose of the invention]

The present invention has been made in view of the above circumstances, and provides a collimator exchange mechanism that allows collimator exchange work to be performed simply and quickly, eliminates the fear of the collimator falling off, and allows for easy positioning of the collimator. It is intended for the purpose of providing.

[Summary of the invention]

Summary of the present invention for achieving the above object is a collimator exchange mechanism for a nuclear medicine device configured to perform rms of a collimator between a detector and a collimator exchange truck for a nuclear medicine device. a first threaded part formed in the collimator, and a second threaded part embedded in the collimator so as to be rotatable and movable in the axial direction and forming a first threaded pair with the first threaded part of the exchange cart, on the outer periphery; a nut each having a third threaded portion at its bottom; and a bolt that is non-rotatably and axially movably attached to the detector and forms a second threaded pair with the third threaded portion at the bottom of the nut. The present invention is characterized in that the collimator is attached to and detached from the exchange cart or the detector by rotating the nut.

[Embodiments of the invention]

Examples of the present invention will be described in detail below.

Figure 2 is an exploded perspective view showing the configuration of the collimator exchange mechanism;
FIG. 3 is a sectional view taken along line 1-1 in FIG. 2.

Components having the same functions as those shown in FIG. 1 are indicated by the same reference numerals.

The exchange cart 1 has stays IA, IA arranged in parallel, and both stays 1A, IA are provided with a total of four first threaded portions 10b.

Four circular buried holes 2A are formed in the collimator 2 at positions corresponding to the first threaded portions 10b of both stays IA, IA.

The circular burial opening 2A is provided through the collimator 2 and has a medium diameter part 2a at the upper end, a large diameter part 2b at the center, and a small diameter part 2C at the lower end, so that the inner diameter varies in stages. It is formed.

A tapered hole 2d is formed at the lower end of the small diameter portion 2C so that a bolt 15, which will be described later, can be easily inserted therein.

10 is a nut, and this nut 10 is shown in FIG. 4(a),
As shown in (b), the whole has a cylindrical shape, and a second threaded part 10a forming a first threaded pair with the first threaded part 10b is provided on the outer periphery, and the second threaded part 10a is larger than the second threaded part 10a. It has a circular bottom portion 11 with a diameter.

The second screw portion 1 extends inward from the end surface of the circular bottom portion 11.
3rd threaded part (female thread) having the same pitch as 0a) 11a
is formed.

As shown in FIG. 3, the nut 10 is buried in the circular burial hole 2A of the collimator 2 with its circular bottom portion 11 located at the large diameter portion 2b and the second threaded portion 10a extending upward from the medium diameter portion 2a. It is rotatable around its axis and movable in its axial direction.

Reference numeral 12 designates four engaging portions formed on the upper end surface of the nut 10.

13 is a nut driver, and the handle part 13 is attached for easy operation.
An engagement convex portion 13b having a shape of 13a and engaging with the above-mentioned engagement recess 12 is formed on the lower end surface.

Four buried holes 14 are formed in the detector 3 at positions corresponding to the respective circular buried holes 2A of the collimator 2.

The buried hole 14 includes, for example, a rectangular bottom hole portion 14a and a circular insertion hole portion 14b, and a bolt 15 is buried in this buried hole 14.

As shown in FIGS. 5(a) and 5(b), the bolt "!5 has a square a base 15a and the third threaded portion 1 of the nut 10.
1a and a threaded portion 15b forming a second threaded pair. The bottom base 15a is buried in the bottom hole 14a and cannot rotate, and the threaded portion 15b
is made to protrude upward from the insertion hole portion 14b. Bottom hole part 1
A coil spring 16 is installed inside 4a to urge the bolt 15 upward.

Next, the operation of the collimator exchange mechanism having the above structure will be explained with reference to FIGS. 6 to 9.

First, the process of removing the collimator 2 fixed to the stay 1A from the stay 1A and attaching it to the detector 3 will be described.

As shown in FIG. 6, the bolt 15 projecting upward from the detector 3 is inserted into the circular buried hole 2A of the collimator 2, so that the detector 3 is brought into close contact with the lower end surface of the collimator 2. and,
The engagement protrusion 13b of the nut driver 13 is engaged with the engagement recess 12 of the nut 10.

At this time, the axes of the nut 10 and bolt 15 are aligned.

When the nut driver 13 is rotated in the clockwise direction from this state, the second threaded portion 10a of the nut 10 rotates while being screwed into the first threaded portion 10b of the stay 1A, so the nut 10 moves downward, and therefore , the lower end surface of the nut 10 contacts the upper end of the threaded portion 15b of the bolt 15. The third threaded portion 11a and the threaded portion 15b do not necessarily need to mesh in this state.

When the rotation operation of the nut driver 13 is continued, the nut 10 advances further downward, and the upper end of the bolt 15 is pressed by the bolt 15 without rotating and resists the elastic force of the coil spring 16 as shown in FIG. It advances downward and is pushed into the burial hole 14.

When the nut 10 and the bolt 15 have progressed downward to a certain extent, the third threaded portion 11a and the threaded portion 15b are in an engaged state, and since the bolt 15 is urged upward by the coil spring 16, only the nut 10 will proceed downward.

As a result, as shown in FIG. 8, the second screw portion 10a comes off the first screw portion iob of the stay 1A by 1!1, and
The threaded portion 11a and the threaded portion 15b of the bolt 15 are in an engaged state.

Then, when the rotation operation of the nut driver 13 is continued, the third threaded part 11a is turned into the threaded part 15b as shown in FIG.
, and the collimator 2 is fixed to the detector 3.

The collimator 2 attached to the stay 1A in this manner is detached from the stay 1A and fixed to the detector 3 simply by rotating the nut driver 13.

Next, a process of removing the collimator 2 attached to the detector 3 from the detector 3 and attaching it to the stay 1A will be described.

In this case, the series of steps described above can be followed in reverse.

When the screw 13 is engaged with the nut 10 and rotated in the direction in which the right-hand thread returns, the tightening of the third threaded portion 11a against the threaded portion 15b is loosened, and the nut 10 moves upward and its upper end touches the stay 1A. It abuts on the first threaded portion 10b.

0(1), the second threaded portion 10a and first threaded portion 1ob of the nut 10 do not necessarily need to mesh.

If the nut driver 13 continues to rotate, the upward movement of the nut 10 is restricted by the stay 18, so the bolt 15 is pushed backwards toward the buried hole 14, and at this time, the nut 15 is pushed through the bolt 15. Since the elastic force of the coil spring 16 acts on the nut 10, the upper end of the nut 10 is pressed against the first threaded portion 10b of the stay 1A, as shown in FIG.

Further, when the rotation operation of the nut driver 13 is continued, the second threaded part 10a of the nut 10 and the first threaded part 10 of the stay 1A
b enter the engaged state, the nut 10 moves upward again, and finally, the engaged state between the third threaded part 11a and the threaded part 15b is released as shown in FIG. 7, and the collimator 2 is separated from the detector 3. do.

When the rotation operation of the nut driver 13 is further continued, the second threaded portion 10a and the first threaded portion 10b are tightened, and the collimator 2 is fixed to the stay 1.

The present invention is not limited to the embodiments described above, and various modifications can be made within the scope of the invention.

For example, in the above embodiment, the bolt embedded in the detector has a rectangular bottom base, but it may also have a hexagonal, hexagonal, or other shape that restricts its rotation. .

Further, the pitch of the third threaded portion 11a and the threaded portion 15b forming the second threaded pair does not necessarily have to be the same as the pitch of the second threaded portion 10a. Similarly, the collimator and detector can be attached and detached.

(Effects of the Invention) According to the present invention described in detail above, there is provided a collimator exchange mechanism for a nuclear medicine apparatus that can perform the work of attaching and detaching the collimator to the exchange cart and detector more easily and quickly than in the conventional system. be able to.

Further, since the collimator is removed from the exchange cart and attached to the detector in a single operation, there is no risk of forgetting to tighten the nut, and therefore the collimator can be prevented from falling off.

Furthermore, since the bolt protrudes upward from the detector,
Positioning of the collimator relative to the detector becomes easy.

[Brief explanation of drawings]

Fig. 1 is an exploded perspective view showing a collimator exchange mechanism of a conventional nuclear medicine device, Fig. 2 is an exploded perspective view showing an embodiment of the present invention, and Fig. 3 is a sectional view taken along line 1-1 in Fig. Figure 4(a) is a plan view of the nut, Figure 4(b) is a sectional view of nuts 1 to 5,
FIG. 5(a) is a plan view of the bolt, FIG. 5(b) is a front view of the bolt, and FIGS. 6 to 9 are sectional views showing the operation of the embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Exchange trolley, 2... Collimator, 3... Detector, 10... Nut, 10a... Second screw part, 11
a...Third screw part, 13...Nut driver, 15...
- Bolt, 15b...Threaded part. Figure 6 +4 16

Claims (1)

[Claims] In a collimator exchange mechanism for a nuclear medicine device configured to insert a collimator between a collimator exchange cart of a nuclear medicine device and a detector, a first threaded portion formed on the exchange cart and a collimator inside the collimator. The first threaded portion of the exchange cart and the first
The second threaded part forming the threaded pair is on the outer periphery, and the third threaded part 6
a bolt 1 which is non-rotatably and axially movably taken by the detector (=J4) and forms a second threaded pair with a third threaded part at the bottom of said nut; A collimator exchange mechanism for a nuclear medicine apparatus, characterized in that the collimator is attached to and detached from a exchange trolley or a detector by rotating the collar 1-.