JP4351804B2 - Cylinder mounting device in dental cartridge type injection device - Google Patents

Description

[0001]
[Field of the Invention]
The present invention generally relates to a dental cartridge type injection device, and more particularly to an attachment device for a receiving tube adapted to receive a cartridge.
[0002]
[Prior art and problems to be solved by the invention]
In this type of injection device, the receiving tube is detachably attached to the receiving port of the mounting member provided on the support member of the plunger rod fixed to the nose portion of the housing, and is removed from the receiving port for each injection. Insert the cartridge into the receiving tube and attach it to the receiving port again. The receiving tube is provided with a viewing window facing the diameter direction. The window plays an important role in visually observing the state of the cartridge in the receiving tube during injection, that is, the injection consumption of the injection solution. The tip of the injection needle connected to the tip of the receiving tube through the inside of the cartridge forms a cutting edge with a cut surface, and when this is inserted into the gingiva in the patient's oral cavity, the angle of the gingiva should be adjusted. is important.
[0003]
The angle at which the cartridge is viewed through the window changes depending on the physique of the dentist who handles the injection device, the posture of the treatment to the patient, etc. is necessary.
[0004]
SUMMARY OF THE INVENTION An object of the present invention is to provide a mounting device for a receiving tube in a dental cartridge type injection device which can easily change the direction of the viewing window and the direction of the cut surface of the injection needle as desired and can maintain the direction. It is to provide.
[0005]
The object of the present invention includes a mounting member having a receiving port of an injection device and a receiving tube having a viewing window that is inserted into the receiving port and is opposed to the diameter direction. A plurality of ball holding holes spaced apart in the circumferential direction; and a locking ball positioned in the ball holding hole, and including an annular groove in which the receiving tube receives a part of the locking ball; The annular cam surface has an annular cam surface and a flank surface, and when the locking ball is aligned with the annular groove, the annular cam surface loops the locking ball so that a part of the locking ball is locked in the annular groove. A locking ring that can move between a position to push toward the groove and a position at which the flank faces the locking ball to release the locking ball from the annular groove, and the annular cam surface of the locking ring includes Always keep the locking ring opposite the locking ball. A rubber O-ring further including a coil spring for pressing, wherein the mounting member has an annular groove formed on an inner surface thereof, and is received in the annular groove and is brought into frictional contact with the outer peripheral surface of the receiving cylinder. Is further achieved by providing a mounting device for a receptacle in a dental cartridge injection device.
[0006]
In a preferred embodiment, the annular groove for receiving the rubber O-ring has a trapezoidal cross section, the groove width on the inner surface side of the mounting member is smaller than the diameter of the cross section of the O-ring, and the groove depth is The inner peripheral portion of the O-ring is smaller than the diameter of the cross-section of the O-ring so that only a small amount of business travels from the inner surface of the mounting member.
[0007]
[Action]
When the locking ring is pushed to the position where the flank face faces the locking ball against the action of the coil spring, the locking ball can move radially outward toward the flank face. It is possible to remove or install the receiving tube by simply inserting / removing the receiving tube into / from the receiving port. When the hand is released from the locking ring, the locking ring is pushed back to the original position by the action of the coil spring. The annular cam surface engages with the locking ball and pushes it inwardly in the radial direction toward the annular groove of the cylinder, thereby retaining the receiving cylinder from the receiving port. The receiving tube can be rotated in this state, so that the direction of the viewing window of the receiving tube and the direction of the cut surface of the cutting edge of the injection needle attached to the receiving tube can be changed as desired. The rubber O-ring provided on the mounting member gives moderate rotation braking to the receiving cylinder by frictional contact with the outer peripheral surface of the receiving cylinder, and the cut surface of the viewing window and the cutting edge of the injection needle is oriented as desired. In addition, it can be stably maintained during the injection operation.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Referring to the drawings, an embodiment of a dental cartridge type injection device according to the present invention will be described. The illustrated dental cartridge type injection device is electrically operated and is applied to the nose portion 2 of the housing 1 in an appropriate manner. It includes an attachment member 5a that is fixedly attached to the tip of a support member 4 for slidably supporting the plunger rod 3 with a screw. The plunger rod 3 is driven forward at a very low speed by a driving device (not shown). Reference numeral 6 denotes a housing holding cap screwed to the mounting member 5a. As is apparent from FIGS. 2 and 3, the mounting member 5 a has a plurality of ball holding holes 7 spaced in the circumferential direction, and a locking ball 8 positioned in the ball holding hole 7. . The receiving tube 9 is inserted into the receiving port 5 of the mounting member 5 a, and the insertion depth is limited by the shoulder 10 that engages with the tip of the receiving port 5. The receiving tube 9 has a viewing window 11 at a position opposed to the diameter direction thereof, and is provided with an annular groove 12 on the outer periphery for receiving a part of the locking ball 8. A locking ring 13 is provided on the outer peripheral surface of the mounting member 5a. The locking ring 13 has an annular cam surface 14 and a flank 15 which are adjacent to each other. When the locking ball 8 is aligned with the annular groove 12, an annular ring is formed. The cam surface 14 is moved to push the locking ball 8 toward the annular groove 12 in order to lock a part of the locking ball 8 in the annular groove 12, and in order to release the locking ball 8 from the annular groove 12. The surface 15 can move between the positions facing the locking balls 8. The movement of the locking ring 13 to the position where the locking ball 8 is released from the annular groove 12 of the receiving tube 9 is in the direction toward the housing side of the injection device. The coil spung 16 is interposed between the shoulder of the annular cam surface of the locking ring 13 and the shoulder 5 'formed on the outer peripheral surface of the mounting member 5a, and the locking ring 13 is locked by the annular cam surface 14 thereof. The ball 8 is always pushed in a position facing the ball 8, that is, in a direction away from the injection device. Reference numeral 17 denotes a stop ring, which is fitted in a circumferential groove formed on the outer peripheral surface of the attachment member 5 a on the side of the flank 15 of the locking ring 13 and is pressed by the coil spring 16. Help keep it in place. In FIG. 2, reference numeral 4 ′ is a control rod that is pushed by the rear end face to operate the drive device of the injection device when the receiving tube 9 is inserted into the receiving port 5.
[0009]
Reference numeral 18 indicates a known cartridge inserted into the receiving cylinder 9, and the cartridge 18 is held at the tip by a base 19 and is pierced by an injection needle 20 attached to the tip of the receiving cylinder 9. And a plunger rubber 22 which is fitted to the rear end of the cartridge and is pushed by the plunger rod 3 of the injection device to inject the injection solution in the cartridge through the injection needle. The tip of the injection needle 20 has a cutting edge with a cut surface 20 '.
[0010]
As is clear from FIGS. 2 and 4, the dental cartridge type injection device according to the present invention is provided with a rotation braking means for the receiving tube 9. The rotation braking means has an annular groove 23 formed on the inner surface of the mounting member 5a, is received in the annular groove 23, and is made of a rubber O-ring 24 that comes into frictional contact with the outer peripheral surface of the receiving cylinder 9. Is further included. As shown in an enlarged view in FIG. 5, in a preferred embodiment, the annular groove 23 for receiving the rubber O-ring 24 has a trapezoidal cross section, and the groove width on the inner surface side of the mounting member 5a is as follows. The diameter of the O-ring 24 is smaller than the diameter of the cross section, and the depth of the groove is larger than the diameter of the cross section of the O-ring so that the inner peripheral portion of the O-ring 24 travels slightly from the inner surface of the mounting member. It is getting smaller. Thus, the O-ring 24 is stably housed in a state where a part of the O-ring 24 is exposed in the annular groove 23 so as to be compressed when the receiving tube is inserted into the receiving port. The material of the O-ring 24 is preferably made of a synthetic rubber such as silicon rubber, fluorine rubber, or nitrile rubber.
[0011]
In use of the injection device, the locking ring 13 is pushed against the action of the coil spring 16 to a position where the flank 15 faces the locking ball 8. Then, as a result of the annular cam surface 14 of the locking ring 13 being separated from the locking ball 8 and the flank 15 being positioned there, the locking ball 8 is freed radially outward, and the receiving tube 9 is placed in the receiving port 5. It can be removed and installed from the receptacle just by inserting and removing. Thus, when the cartridge 18 is loaded from the rear into the receiving tube 9 removed from the receiving port 5, the receiving tube 9 is inserted into the receiving port 5. At this time, the O-ring 24 is compressed by the amount of the business trip by the inserted outer peripheral surface of the receiving tube 9 and frictionally contacts the outer peripheral surface of the receiving tube. Next, when the hand is released from the locking ring 13, the locking ring 13 is pushed back to the original position by the action of the coil spring 16, and the annular cam surface 14 engages with the locking ball 8 to receive it. Pushing inward in the radial direction toward the annular groove 12, thereby retaining the receiving tube from the receiving port. The receiving tube 9 can rotate around itself in that state, and therefore the direction of the viewing window 11 of the receiving tube 9 and the cut surface 20 ′ of the cutting edge of the injection needle 20 attached to the tip of the receiving tube 9 are as desired. Although it can be changed, the receiving cylinder is prevented from rotating unintentionally by frictional contact with the rubber O-ring 24. Thus, the viewing window 11 and the cut surface 20 'of the cutting edge of the injection needle 20 can be stably maintained in the desired direction.
[0012]
When the injection needle 20 is attached to the tip of the cylinder 9, the inner needle is pierced by the rubber stopper 21 of the cartridge 18 and the injection needle 20 communicates with the inside of the cartridge 1. Thus, the injection liquid can be ejected from the injection needle by operating the plunger rod 3 and pushing the plunger rubber 22 of the cartridge 18. At this time, the injection amount of the injection solution can be visually observed through a viewing window adjusted in the most easily viewable direction.
[Brief description of the drawings]
FIG. 1 is an overall perspective view of a dental cartridge type injection device according to the present invention.
FIG. 2 is a partial cross-sectional view of an injection device according to the present invention showing a mechanism for connecting a receiving tube to a receiving port.
FIG. 3 is a cross-sectional view taken along line 3-3 in FIG.
4 is a cross-sectional view taken along line 4-4 of FIG.
FIG. 5 is an enlarged view showing details of an annular groove and an O-ring fitted therein.
[Explanation of symbols]
5 Receiving port 5a Mounting member 7 Locking ball holding hole 8 Locking ball 9 Receiving tube 11 Viewing window 12 Annular groove 14 Cam surface 15 Relief surface 16 Coil spring 23 Annular groove 24 Rubber O-ring

Claims (2)

The mounting member includes a mounting member having a receiving port of the injection device, and a receiving tube having a viewing window provided to face the diametrical direction, the mounting member being spaced apart in the circumferential direction. An annular cam surface having a plurality of ball holding holes and a locking ball positioned in the ball holding hole, wherein the receiving tube includes an annular groove adapted to receive a part of the locking ball; And a position where the annular cam surface pushes the locking ball toward the annular groove in order to lock a part of the locking ball in the annular groove when the locking ball is aligned with the annular groove. A locking ring that can move between a position where the flank face faces the locking ball to release the locking ball from the annular groove, and a position where the annular cam surface of the locking ring faces the locking ball Coil spring that always presses the locking ring The mounting member further includes a rubber O-ring having an annular groove formed on the inner surface thereof, received in the annular groove, and brought into frictional contact with the outer peripheral surface of the receiving tube. A mounting device for a receiving tube in a dental cartridge type injection device. The annular groove has a trapezoidal cross section, and its depth is slightly smaller than the diameter of the cross section of the O-ring so that the inner peripheral portion of the O-ring is slightly traveled from the inner surface of the receiving tube. Item 4. A mounting device for a receiving cylinder in the dental cartridge type injection device according to Item 1.

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