JPS6019691Y2 - Opening device for small animals - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a mouth opening device for small animals, and more particularly to a mouth opening device for small animals that is suitable for being attached to the oral cavity of a small animal to open the mouth of the small animal and conduct experiments in the oral cavity.

Conventionally, for small animals such as rats, mice, and hamsters,
When treating a small animal by moving its teeth or examining the pharmacological effects of applying medicine to the tongue, humans hold the upper and lower jaws of the small animal with tweezers or the like and open the small animal's mouth.

However, the above-mentioned opening method has the problem that the opening is easily made uncertain because the opening is performed by a person using tweezers, and the opening operation cannot be performed quickly.

This has been a particular problem in experiments investigating pharmacological effects in the oral cavity (particularly enzyme experiments), where large amounts of specimens (small animals) need to be processed quickly in order to obtain large amounts of data.

In addition, as a conventional example of an animal opening device, Utility Model Publication No. 5-12738
Publication, ``Kurosawa's 1 Clinical Illustrated Guide to Surgical Surgery Yokendo (
(September 15, 1959) There is something that was revealed in P49Jl.

However, these animal opening devices are used for household animals with large oral cavities, and have a structure in which the degree of opening can be adjusted using turnbuckles, etc., so they cannot be directly applied to small animals with small oral cavities. There is also the problem that it is not possible.

In other words, it is extremely difficult to adjust the opening degree of small animals with small mouths using turnbuckles or the like.

An object of the present invention is to eliminate the drawbacks of the prior art described above and to provide a small animal opening tool that has a simple structure and is convenient for opening the mouth of a small animal quickly and reliably.

The small animal opening device of the present invention has two thin metal wires connected at their ends so as to face each other, and an elastic force applying part that applies a repulsive force to keep the two thin metal wires apart from each other at all times. and an opening device for small animals, characterized in that the two thin metal wires are brought close together and inserted into the oral cavity of a small animal, and the oral cavity of the small animal is expanded by the repulsive force of the elastic force imparting part. It is.

In the above configuration of the present invention, the elastic force imparting section uses its repulsive force to separate the upper jaw and the lower jaw to perform an opening operation.

By adjusting the elastic force of the elastic force applying part,
The degree of opening can be adjusted.

Embodiments of the present invention will be described below based on the accompanying drawings.

FIG. 1 shows a first embodiment of the present invention, in which the opening tool is made of two thin metal wires, and these thin metal wires are connected to the other end and the hemline loop portion (hereinafter, for convenience, the winding portion IA). , IB), and a total of four straight parts 2A, 2B, 2C, 2D extending from both ends of these winding parts, respectively.
and a straight part 3A that connects the straight parts 2A and 2B in a state that is almost orthogonal to them, and a straight part 3B that connects the two in a state that is almost orthogonal to the straight parts 2C and 2D. .

FIG. 2 shows a second embodiment of the present invention, which differs from the second embodiment in that the straight parts 3A and 3B are wider than 90 degrees and narrower than 180 degrees with respect to the straight parts 2A to 2D. This means that they are connected in an alternating manner.

FIG. 3 shows a front view of the opening tool shown in FIG.
3A and 2B and straight portions 2C, 3B and 2D are connected to each other so as to be located substantially within a plane.

FIG. 4 shows a fourth embodiment of the present invention, which differs from the first embodiment in that straight parts 2A and 20 are pivotally connected at three points, a spring 4A is attached between both straight parts, and straight part 2B and 2
D is pivoted at point b, and a spring 4B is attached between both straight parts.

In this embodiment, although not particularly shown, in the second embodiment shown in FIG. 2 and the third embodiment shown in FIG. 3,
As in the fourth embodiment shown in FIG. 4, straight lines 2A and 20 are pivotally connected, a spring is attached between both straight parts, and
It is also possible to pivotally connect and 2D and attach a spring between both linear parts.

FIG. 5 shows a fifth embodiment of the present invention, in which a tongue-shaped plate 5 extending from the straight section 3B of the first embodiment toward the winding sections IA and IB is attached.

The opening tool having the plate plate 5 is attached so that the straight portion 3B on the side having the plate plate is on the lower jaw side.

The plate plate 5 includes the first embodiment shown in FIG.
Even in the case shown in the figure, it can also be provided in the straight portion 3B.

Further, in this embodiment, although not particularly shown, a thin metal wire having a shape corresponding to the outer peripheral edge of the plate plate 5 may be provided instead of the tongue-shaped plate plate 5.

According to this embodiment, the movement of the tongue within the oral cavity can be fixed by providing the plate.

Therefore, it becomes easier to perform experimental operations within the oral cavity.

In each of the above embodiments, the thin metal wire portions other than the winding portion and the spring do not necessarily have to be straight portions, but may be curved portions.

FIGS. 6 and 7 show a state in which the opening device for small animals shown in FIG. 1 is attached to the oral cavity of a rat under general anesthesia, and the rat's mouth is opened.

That is, the approximately central portion of the straight portion 3A is fixed to the upper teeth in the rat's mouth 6, the approximately central portion of the straight portion 3B is fixed to the lower teeth in the cavity of the rat 60, and the straight portions 2A to 2D are connected to each other. The gyral parts IA and 1B are located at a distance from both sides of the rat's 6 head.

Therefore, the mouth of the rat 6 is fixed in a completely open state, and there is sufficient space in the front and both sides of the mouth of the rat 6, so there is no obstacle when operating the experimental equipment.

In the embodiments shown in FIGS. 2 to 4, the linear portions 3A and 3B are fixed to the rat's upper and lower teeth, respectively, and the same effect is achieved in that there is no obstacle when operating the experimental equipment. be.

In the case of the fifth embodiment shown in FIG. 5, straight portions 3A and 3B
When fixing the straight portions 3B to the rat's upper teeth and lower teeth, respectively, and fixing the straight portion 3B at the same time, the rat's tongue should be pressed against the outside of the plate.

In this way, the plate is more advantageous than the thin metal wire corresponding to the outer periphery of the plate in terms of reliably pressing the rat's tongue.

By firmly holding down the rat's tongue, experimental operations within the rat's mouth can be carried out smoothly without being affected by the movement of the rat's tongue, and the throat can also be observed easily.

In the present invention, the diameter of the thin metal wire, the length of the straight part, etc. should be arbitrarily determined depending on the type of small animal to which the opening for small animals is attached, the size of the small animal, etc.; The diameter is O0grran, the length of straight parts 2A to 2D and straight parts 3A and 3B is 3 each.
A material with a diameter of about 0 mm can be used.

Further, the thin metal wire has rigidity, hardness, and heat resistance, and it is also desirable to have sufficient acid resistance since many experimental operations using acids, such as acid etching, are carried out.

From this point of view, as the metal thin wire, for example, Cr,
A Co-based alloy containing Mo, W, etc. is suitable.

Furthermore, if the straight part or the surface of the plate is made of metal, it is easy to damage the oral cavity, teeth, or tongue of small animals such as rats, so the straight part or the plate surface is made of a soft resin with relatively high heat resistance, acid resistance, etc. It is desirable to coat with

As explained above, according to the opening device for small animals according to the present invention, the opening device can be easily inserted into the oral cavity of a small animal, and the opening device can be attached.

The opening operation is quick and reliable, and the small animal's mouth can be kept open for a long period of time, making it easy to conduct experiments inside the oral cavity.

[Brief explanation of drawings]

FIGS. 1, 2, 3, 4 and 5 are perspective views showing embodiments of the opening device for small animals according to the present invention, and FIG.
FIG. 7 and FIG. 7 are explanatory diagrams showing a state in which the opening device for small animals according to the present invention is attached to a small animal. IA, IB... Winding part, 2A, 2B, 2C
, 2D...straight line part, 3A, 3B...straight line part, 4A, 4B...spring, 5...
...Plate, 6...Rat.

Claims (3)

[Scope of utility model registration request] (1) It has two thin metal wires connected at their ends so as to face each other, and an elastic force applying part that applies a repulsive force so as to constantly separate the two thin metal wires from each other, A mouth opening tool for a small animal, characterized in that the small metal wire is brought close to each other and inserted into the mouth of the small animal, and the oral cavity of the small animal is expanded by the repulsive force of the elastic force imparting part. (2) A small animal according to claim 1 of the utility model registration claim, wherein the elastic force applying portion is connected to one thin metal wire and the other thin metal wire via a hemline loop-shaped thin metal wire. opening tool. (3) In paragraph 1 of the claims for utility model registration, the above 2.
An opening tool for small animals, characterized in that a tongue-shaped plate is provided approximately at the center of one side of the thin metal wire of the book.