JPS6157023B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present application relates to a dental anesthesia device, and more particularly to a cooled dental anesthesia device using the Hirsch tube principle.

The embodiments of the present application will be described in detail below with reference to the drawings.
Reference numeral A denotes a hand-held member, which is composed of a shaft cylinder 1 and a distal shaft cylinder 3 made of a heat insulating material such as a synthetic resin, which is threadedly connected to the tip of the shaft cylinder 1 and has a through hole 2 in the shaft center. A cooling member 4 using the principle of a Hirsch tube is fitted into the tip of the shaft cylinder 1. The cooling member 4 is composed of a short cylindrical body, and has a spiral space 5 formed in a spiral cross section in the longitudinal center thereof, as shown in FIG. An air supply hole 8 that extends in the diametrical direction from 6 and communicates with a communication hole 7 that communicates with an air supply path 17 to be described later to eject pressurized air into the vortex space 5, and the entire rear surface of the vortex space 5. Hot air holes 9 that communicate with each other and extend rearward, and cold air holes 1 that open at the front surface of the spiral space 5 and extend forward.
0, and a disk-shaped aperture plate 12 that fits into the cold air hole 10 so as to close its end face and has a pore 11 in the center that communicates with the center of the spiral space 5. has been done. 13 is a cooling pipe whose front end extends to the middle of the through hole 2 of the hand-held member A and whose rear end is threadedly connected to the cold air hole 10;
Reference numeral 14 denotes a rod-shaped thermal conductor with good thermal conductivity, which is fitted into the front part of the through hole 2 so that its tip protrudes beyond the tip of the hand-held member A. It faces into a cavity 16 having an exhaust hole 15 formed in a radially extending direction, and the cold generated by the cooling member 4 is supplied into the cavity 16 through the cooling pipe 13, and the heat is removed. conductor 1
4 is cooled. The cold air in the empty chamber 16 is discharged to the outside air through the exhaust hole 15 communicating with the empty chamber 16. 17
Figure 3 shows an external shape in which an air supply passage 18 that communicates with the communication hole 7 and an exhaust passage 19 that communicates with the hot air hole 9 and opens on the outer peripheral surface through the communication hole 19' are provided at the tip end. As shown in C, this is a passage member having a rectangular shape, and its distal end surface is pressed against the rear surface of the cooling member 4 via a holding piece 21 by a tightening ring 20 that is screwed into the rear portion of the shaft cylinder 1. It is fitted into the shaft cylinder 1. Reference numeral B designates a joint member rotatably and detachably connected to the rear portion of the hand-held member A via a connecting mechanism 22, and has an air supply passage 23 communicating with the air supply passage 18, an exhaust passage 19, and outside air connected therein. A flexible hose connected to a pressurized air source is attached to the rear end of the air supply passage 23.

Therefore, pressurized air is transferred from the pressurized air source to the air supply passage 2.
3. When the air flows into the vortex space 5 through the air supply path 18, the communication hole 7, and the air supply hole 8, cold air is generated at the center of the vortex space 5 and hot air is generated at the outer periphery according to the Hirsch tube principle. The cold air in the center flows into the cooling pipe 13 through the pores 11 of the aperture plate 12 and enters the empty chamber 16.
After cooling the rear end of the heat conductor 14, the heat conductor 14 is discharged to the outside air through the exhaust hole 15. The distal end of the heat conductor 14 protruding from the distal end of the hand-held member A is applied to the area to be anesthetized. On the other hand, the hot air at the outer periphery of the spiral space 5 flows from the hot air hole 9 to the exhaust path 19 and to the shaft cylinder 1.
is discharged to the outside air via the inner periphery of the air and the exhaust passage 24.

FIG. 4 is a diagram showing another embodiment of the tip of the hand-held member A corresponding to FIG. , the tip of the cooling pipe 25 communicating with the pore 11 is extended to near the front of the tip barrel 3 made of a heat insulating material, and the rear of the heat conductor 14 is fitted into the through hole 2 of the tip barrel 3. An air inlet hole 26 along the central axis and an air outlet hole 27 extending radially from the tip thereof are provided at the end thereof, and the air inlet hole 26 is provided in the cooling pipe 25, and an air outlet hole 27 is provided in the tip shaft cylinder 3.
They are connected to each other.

The cold air generated in the cooling member 4 flows from the cooling pipe 25 into the air intake hole 26 of the heat conductor 14 and cools the heat conductor 14, and then is discharged to the outside air from the discharge hole 27 and the exhaust hole 15.

As described above, the present dental anesthesia device uses pressurized air, which is used as a driving source for a dental air turbine handpiece or an air micromotor, as a cooling medium, so it is extremely convenient to use, and its tip can be attached to a hand-held member. Since the heat conductor is provided in a more protruding manner, it has the advantage that it is particularly effective for local cooling anesthesia.

[Brief explanation of the drawing]

The drawings show an embodiment of the present application, and FIG. 1 is a partially cutaway side view, FIG. 2 is an enlarged sectional view of the main part, and FIG.
Figures A, B and C are respectively cross-sectional views taken along the - line in Figure 1;
- line sectional view and - line sectional view, FIG. 4 is a view showing another embodiment corresponding to FIG. 1. In the figure, A is a hand-held member, 1 is a shaft cylinder, 2 is a through hole, 3
is the tip shaft cylinder, 4 is the cooling member, 5 is the spiral space, 6
is the end, 7 is the communication hole, 8 is the air supply hole, 9 is the hot air hole,
10 is a cold air hole, 11 is a pore, 13 is a cooling pipe,
14 is a heat conductor, 15 is an exhaust hole, 16 is a vacant room, 1
7 is a passage member, 18 is an air supply path, and 19 is an exhaust hole.

Claims (1)

[Scope of Claims] 1. A vortex-shaped space portion in which pressurized air supplied from an air supply hole is guided in a vortex shape in a cylindrical hand-held member, a hot air hole communicating with the entire rear surface of this vortex-shaped space portion, A cooling member having a cold air hole that communicates with the center of the spiral space is fitted on the front side of the spiral space, and an exhaust passage for discharging hot air to the outside air is connected to the hot air hole, and a A dental anesthesia tool, characterized in that a rod-shaped thermal conductor is attached, the tip of which protrudes from the tip of the hand-held member, and the rear end of which is cooled by cold air from the cooling hole. 2. The dental anesthesia tool according to claim 1, wherein the rear end of the heat conductor is interposed in a through hole that communicates with the cooling hole. 3. The dental anesthesia tool according to claim 1, wherein the rear end of the heat conductor is provided with a hole that communicates with a cooling hole and a hole that discharges cold air.