JP6836757B2 - Gag - Google Patents

Description

The present invention relates to a gag to assist a patient in maintaining an open state during dental treatment or dental examination.

At the time of dental treatment or dental examination, a gag has been conventionally used so that the dentist can visually recognize the inside of the oral cavity (teeth and jaws (gingiva)) from outside the patient's oral cavity. The gag keeps the patient's mouth open by interposing inclusions between the patient's upper and lower teeth. That is, the use of the gag makes it easier for the patient to maintain the open state (open mouth) and facilitates the treatment and examination of the oral cavity by the dentist.

Such an opening device is disclosed in, for example, Patent Documents 1 and 2.
Patent Document 1 discloses a dental opening device in which a bite block is interposed between upper and lower molars to open the mouth, and the lips are opened to expose the shigin (gingiva). Further, in Patent Document 2, the upper member and the lower member opened and closed by the actuator engage with the upper tooth (incisor) and the lower tooth (incisor) of the patient, respectively, and the upper member and the lower member are engaged with each other. Disclosed are openers that open the patient's mouth by expanding the angle formed by the teeth.

JP-A-2007-282698 Japanese Patent No. 5832379

By the way, in the dental opening device of Patent Document 1, only the bite block is interposed between the upper and lower molars to expose the shigin, and the opening of the mouth cannot be finely adjusted. That is, when the opening of the mouth is insufficient, the mouth cannot be opened further. Further, unless a plurality of bite blocks having different sizes are prepared, it cannot be used for a patient such as a young person whose mouth does not open wide.

Further, in the opening device of Patent Document 2, the opening of the mouth can be finely adjusted and fixed, but the upper member and the lower member are engaged with the upper and lower incisors (front teeth), respectively, and further, the upper side. Since the member and the lower member are arranged around the mouth, even if the patient's mouth is opened, the upper member and the lower member are in the way, making it difficult for the dentist to visually recognize the inside of the patient's mouth. Further, since the upper member and the lower member are engaged with the incisors, the incisors cannot be treated. Further, since the actuator and the brake are required, the manufacturing of the opening device becomes very costly.

Therefore, the present invention can easily assist the patient in maintaining the open state, can easily change the way the mouth opens, and allows the dentist to see the patient's mouth well. The challenge is to provide an opening device that can.

The invention according to claim 1 for solving the above problem has a pair of a first arm member and a second arm member having a free end side and a proximal end side, and the first arm member and the second arm member. The base end side is rotatably connected to each other, and the first support portion and the second support portion are brought into contact with the occlusal portions of the upper and lower molar teeth on the free end side of the first arm member and the second arm member, respectively. Is provided, and a common male screw member is provided in the middle of the first arm member and the second arm member, and the male screw member is first screwed with the first arm member side. a screw portion, and the second threaded portion is provided to the second arm member side screwed, said first threaded portion and a second threaded portion, Ri Oh in upside-down screw, first screw in the male threaded member A first female screw member and a second female screw member are screwed into the portion and the second screw portion, respectively, and the male screw member is first via the first female screw member and the second female screw member. is connected to the arm member and a second arm member, said first female screw member and the second female screw member, characterized in can der Rukoto relative rotation with respect to the first arm member and the second arm member It is an opening device.
Further, the related invention has a pair of a first arm member and a second arm member having a free end side and a base end side, and the base end side of the first arm member and the second arm member can rotate with each other. It is connected, and on the free end side of the first arm member and the second arm member, a first support portion and a second support portion that come into contact with the occlusal portions of the upper and lower molars are provided, respectively. A common male screw member is provided in the middle of the arm member and the second arm member, and the male screw member includes a first screw portion to be screwed with the first arm member side and a second arm member side. A second screw portion to be screwed with the screw portion is provided, and the first screw portion and the second screw portion are opening devices having screws in opposite directions.

The invention according to claim 1 has a pair of a first arm member and a second arm member having a free end side and a base end side, and the first arm member and the base end side of the second arm member rotate with each other. It is possible to connect, and the first support part and the second support part that come into contact with the occlusal parts of the upper and lower molars are provided on the free end side of the first arm member and the second arm member, respectively. When the first arm member and the second arm member rotate about the proximal end side, the distance between the free end side of the first arm member and the second arm member changes. That is, the distance between the first support portion and the second support portion on the free end side of both arm portions is widened or narrowed.
Further, a common male screw member is provided in the middle of the first arm member and the second arm member, and the male screw member includes a first screw portion screwed with the first arm member side and a second screw member. A second screw portion to be screwed with the arm member side is provided, and the first screw portion and the second screw portion are screws in opposite directions. Therefore, when the male screw member is rotated, the base end side becomes the base point. The opening angles of the first arm member and the second arm member are changed. That is, both arm members can be rotated around the base end side to be in a parallel state or in a crossed state. The crossing angle of both arm members can be gradually increased or gradually decreased by rotating the male screw member.
Therefore, the patient can open the mouth without difficulty and can maintain the open state without difficulty. In addition, by rotating the male screw member, the angle formed by the first arm member and the second arm member can be changed at any time as needed, so that the patient feels pain during the oral examination or treatment. In such a case, the examination or treatment can be interrupted and the male screw member can be operated to reduce the opening angle of both arm members to temporarily reduce the opening of the mouth, thereby reducing the burden on the patient.
Further, when the opening device is removed from the mouth, the angle formed by the first arm member and the second arm member can be gradually reduced, which is safe. That is, there is no risk that the first arm member and the second arm member will suddenly close and pinch the lips or the like and cause injury.

The opening according to claim 1, wherein a large-diameter rotary operation portion is provided between the first screw portion and the second screw portion of the male screw member. It is a vessel.

In the invention according to claim 2, since a large-diameter rotation operation portion is provided between the first screw portion and the second screw portion of the male screw member, the male screw can be screwed by operating the rotation operation portion. Easy to rotate the member.

Further, in the invention according to claim 1 , the first female screw member and the second female screw member are screwed to the first screw portion and the second screw portion of the male screw member, respectively, and the male screw member is , The first female screw member and the second female screw member are connected to the first arm member and the second arm member, and the first female screw member and the second female screw member are connected to the first arm member. Ru der capable of relative rotation with respect to the second arm member.

In the invention according to claim 1 , the first female screw member and the second female screw member are screwed into the first screw portion and the second screw portion of the male screw member, respectively, and the male screw member is the first female screw member. It is connected to the first arm member and the second arm member via the first female screw member and the second female screw member, and the first female screw member and the second female screw member are the first arm member and the second arm member. Since the relative rotation is possible with respect to the male screw member, when the male screw member is rotated, the positions of the first female screw member and the second female screw member with respect to the male screw member change.
That is, the first female screw member and the second female screw member rotate relative to the first arm member and the second arm member without changing their positions, and the first female screw member and the second female screw member It moves along the male screw member and the distance between both female screw members changes. As a result, the intersection angle between the first arm member and the second arm member changes.
In other words, the first female screw member and the second female screw member rotate relative to the first arm member and the second arm member, respectively, while moving along the male screw member. That is, the first female screw member and the second female screw member move along the male screw member while changing the orientation with respect to the first arm member and the second arm member.
Therefore, the angle formed by the first arm member and the second arm member can be smoothly changed. As a result, the size of the open mouth can be smoothly changed while the upper and lower molars are supported by the first support portion and the second support portion provided on the free end side of both arm members.

The invention according to claim 3 is in a plane in which a portion of the first arm member and the second arm member on the free end side of the portion connected to the male screw member intersects the axial direction of the male screw member. The opening device according to claim 1 or 2 , wherein the opening device is curved toward the proximal end side.

In the invention according to claim 3 , the portion of the first arm member and the second arm member on the free end side of the portion connected to the male screw member is based on a plane intersecting the axial direction of the male screw member. Since it is curved toward the end, the base end side of the gag in which the patient's molars are supported is close to the cheek outside the patient's oral cavity. That is, the portion on the base end side of the opening device is retracted to the side of the patient's mouth. Therefore, the dentist does not get in the way of the gag when examining or treating the patient's oral cavity.
It is preferable that the first screw portion and the second screw portion of the male screw member are multi-threaded screws.

Further, the related invention has a pair of a first arm member and a second arm member having a free end, and the free end side of the first arm member and the second arm member can be opened and closed, and the first arm member and the first arm member On the free end side of the second arm member, a first support portion and a second support portion are provided, which are in contact with the upper jaw side portion and the lower jaw side portion in the oral cavity, respectively, and the first arm member and the second arm member are provided. A common male screw member is engaged with a portion in the middle of the two arm members, and at least one of the first arm member and the second arm member can move along the male screw member. The opening device is characterized in that when at least one of the arm member and the second arm member moves along the male screw member, the distance between the free ends of the first arm member and the second arm member changes.

Here, the maxillary lateral incision refers to the maxillary lateral incision, gums, upper lip, etc. of the maxilla and mandible facing each other in the oral cavity of the patient. The mandibular lateral region refers to the mandibular lateral in the oral cavity of the patient, which is the mandibular lateral in the opposite maxilla and mandible, and refers to the molars, gums, lower lip, etc. on the mandibular side.
Further, "the distance between the free ends of the first arm member and the second arm member changes" means that the distance between the free ends of both arm members is widened or narrowed. That is, it means that both arm members rotate with respect to the portion on the base end side of both arm members, the angle formed by both arm members changes, and the distance between the free ends changes accordingly. There is.
In this related invention, a pair of a first arm member and a second arm member having a free end are provided, and the free end side of the first arm member and the second arm member can be opened and closed, and the first arm member and the second arm member and the second arm member can be opened and closed. A common male screw member is engaged with a part in the middle of the arm member, and when at least one of the first arm member and the second arm member moves along the male screw member, the first arm member and the second arm member and the second arm member are second. The distance between the free ends of the arm member changes. Further, since the first support portion and the second support portion are provided on the free end side of the first arm member and the second arm member so as to contact the upper jaw side portion and the lower jaw side portion in the oral cavity, respectively. , The maxillary and mandibular parts of the oral cavity can be easily supported.
Then, at least one of the first arm member and the second arm member is movable along the male screw member, and at least one of the first arm member and the second arm member is along the male screw member. Since the distance between the free ends of the first arm member and the second arm member changes as the patient moves, the distance between the first arm member and the second arm member on the free end side can be easily expanded when the patient's oral cavity is expanded. Can be expanded.
Further, when inserting the gag into the oral cavity of the patient and when taking out the gag in the oral cavity, the distance between the free ends of the first arm member and the second arm member can be easily narrowed.
Further, when the patient feels pain during the oral examination or treatment, the interval on the free end side can be narrowed quickly and safely, and the burden on the patient can be reduced.

The gag of the present invention can easily assist the patient in maintaining the open state, can easily change the opening of the oral cavity, and allows the dentist to improve the oral cavity of the patient. It can be visually recognized.

It is a perspective view seen from the base end side of the opening device in a closed state which concerns on this embodiment. It is an exploded perspective view of the opening device of FIG. It is a side view of the opening device of FIG. 1, (a) shows a state in which the opening device is closed, and (b) shows a state in which the opening device is opened. It is a perspective view seen from the direction different from FIG. 1 of the opening device in an open state which concerns on this embodiment. (A) is a perspective view showing a state in which a closed gag is inserted on the left side of the patient's oral cavity, and (b) is an open gag, which is the patient's upper left molar. It is a perspective view which shows the state which supports the lower left molars and maintains an open state. FIG. 1 is a perspective view showing a state in which the opening device of FIG. 1 supports the upper right molar and the lower right molar of the patient and maintains the opening state. FIG. 1 is a schematic view of the opening device according to another embodiment, (a) is a side view of a state in which the opening device is closed, and (b) is a side view of a state in which the opening device is open. 1 and 7 are schematic views of the opening device according to another embodiment, (a) is a side view of the opening device in a closed state, and (b) is a side view of a state in which the opening device is open. Is.

Hereinafter, description will be made with reference to the drawings.
As shown in FIGS. 1 and 2, the opening device 1 according to the present embodiment includes a pair of first arm member 2, second arm member 3, and male screw member 5 made of a rigid material such as stainless steel. have.

(First arm member 2)
The first arm member 2 is an elongated member having a base end portion 2a (base end side) and a tip end portion 2b (free end side).
The width of the base end portion 2a is narrower than that of other portions of the first arm member 2, and a narrow portion 17 is formed in the base end portion 2a. The narrow portion 17 is provided with a hole 18 through which a pin 4 in a horizontal posture is inserted.

A first support portion 8 is provided at the tip portion 2b of the first arm member 2. The first support portion 8 has an occlusal portion 33a of the upper left molar 31a (a portion on the upper jaw side of the opposite upper and lower jaws) or an occlusal portion 34b of the lower right molar 32b (a portion on the lower jaw side of the opposite upper and lower jaws) in the center. It has a contact portion 8a to be brought into contact with the contact portion 8a and guide portions 8b arranged on both sides of the contact portion 8a. Each guide portion 8b is continuous with an obtuse angle of 120 degrees with respect to the contact portion 8a. The angle formed by each guide portion 8b and the contact portion 8a is preferably 100 degrees or more and 140 degrees or less, and more preferably 110 degrees or more and 130 degrees or less.

As shown in FIGS. 1, 2, and 4, a curved portion 13 is provided near the tip portion 2b of the first arm member 2. That is, the first arm member 2 is curved at the curved portion 13. The curved portion 13 is curved in a plane that intersects (orthogonally) the axial direction of the male screw member 5 described later. The central angle of the curved portion 13 is about 150 degrees to 170 degrees, and is 160 degrees in this embodiment. Therefore, the curved portion 13 is curved so that the tip portion 2b almost faces the proximal end portion 2a side.

A holding portion 14 is provided between the base end portion 2a of the first arm member 2 and the curved portion 13. That is, the holding portion 14 is provided at a portion in the middle of the first arm member 2. As shown in FIG. 2, the holding portion 14 has two annular portions 14a and 14b in which the longitudinal direction and the radial direction of the first arm member 2 coincide with each other. Both annular portions 14a and 14b form holes of the same size surrounded by an annular edge and face each other in a parallel state. Further, a through hole 19 (FIG. 2) penetrating in a direction orthogonal to the longitudinal direction of the first arm member 2 is provided between the annular portions 14a and 14b of the first arm member 2.

A first female screw member 6 is arranged in the through hole 19. The first female screw member 6 has a cylindrical outer shape, and is provided with a screw hole 6a in a direction orthogonal to the axial direction. That is, the screw hole 6a is provided so as to penetrate the curved surface of the first female screw member 6.

The diameter of the first female screw member 6 is a size that fits exactly into the annular portions 14a and 14b of the holding portion 14. Further, the first female screw member 6 has a length extending from the annular portion 14a to the annular portion 14b. That is, both end portions of the first female screw member 6 in the longitudinal direction (axial direction) are fitted into the annular portions 14a and 14b of the holding portion 14. Further, the screw hole 6a of the first female screw member 6 is arranged in the through hole 19 of the holding portion 14. The first female screw member 6 is supported by the holding portions 14 (annular portions 14a, 14b) with the screw holes 6a facing in a direction orthogonal to the longitudinal direction of the first arm member 2.

(Second arm member 3)
The second arm member 3 has the same structure as the first arm member 2. That is, the second arm member 3 is an elongated member having a base end portion 3a (base end side) and a tip end portion 3b (free end side). The width of the base end portion 3a is narrower than that of other portions of the second arm member 3, and the base end portion 3a is formed with a narrow portion 27. The narrow portion 27 is provided with a hole 28 through which the pin 4 is inserted.
That is, the common pin 4 inserts the hole 18 of the narrow portion 17 of the first arm member 2 and the hole 28 of the narrow portion 27 of the second arm member 3.

A second support portion 9 is provided at the tip portion 3b of the second arm member 3. The second support portion 9 includes a contact portion 9a that abuts the occlusal portion 33b of the lower left molar 31b or the occlusal portion 34a of the upper right molar 32a in the center, and guide portions 9b arranged on both sides of the contact portion 9a. Has. Each guide portion 9b is continuous with an obtuse angle of 120 degrees with respect to the contact portion 9a. The angle formed by each guide portion 9b and the contact portion 9a is preferably 100 degrees or more and 140 degrees or less, and more preferably 110 degrees or more and 130 degrees or less.

As shown in FIGS. 1, 2, and 4, a curved portion 23 is provided near the tip portion 3b of the second arm member 3. That is, the second arm member 3 is curved at the curved portion 23. The central angle of the curved portion 23 is about 150 degrees to 170 degrees, and is 160 degrees in this embodiment. Therefore, the curved portion 23 is curved so that the tip portion 3b almost faces the proximal end portion 3a side.

A holding portion 24 is provided between the base end portion 3a and the curved portion 23 of the second arm member 3. That is, the holding portion 24 is provided at a portion in the middle of the second arm member 3. As shown in FIG. 2, the holding portion 24 has two annular portions 24a and 24b in which the longitudinal direction and the radial direction of the second arm member 3 coincide with each other. Both annular portions 24a and 24b form holes of the same size surrounded by an annular edge and face each other in a parallel state. Further, a through hole 29 (FIG. 2) penetrating in a direction orthogonal to the longitudinal direction of the second arm member 3 is provided between the annular portions 24a and 24b of the second arm member 3.

A second female screw member 7 is arranged in the through hole 29. The second female screw member 7 has a cylindrical outer shape, and is provided with a screw hole 7a in a direction orthogonal to the axial direction. That is, the screw hole 7a is provided so as to penetrate the curved surface of the second female screw member 7.

The diameter of the second female screw member 7 is a size that fits exactly into the annular portions 24a and 24b of the holding portion 24. Further, the second female screw member 7 has a length extending from the annular portion 24a to the annular portion 24b. That is, both end portions of the second female screw member 7 in the longitudinal direction (axial direction) are fitted into the annular portions 24a and 24b of the holding portion 24. Further, the screw hole 7a of the second female screw member 7 is arranged in the through hole 29 of the holding portion 24. The second female screw member 7 is supported by the holding portions 24 (annular portions 24a, 24b) with the screw holes 7a facing in a direction orthogonal to the longitudinal direction of the first arm member 2.

(Male screw member 5)
The male screw member 5 has a structure in which a large-diameter disk-shaped operation portion 12 (rotation operation portion) is provided at the central portion of the rod-shaped member in the longitudinal direction. That is, the male screw member 5 is provided with a first screw portion 10 having a diameter smaller than that of the operation unit 12 on the upper side of the operation unit 12, and a second screw having a diameter smaller than that of the operation unit 12 on the lower side of the operation unit 12. It has a structure in which the portion 11 is provided.

The first screw portion 10 and the second screw portion 11 have opposite screw directions. For example, the first threaded portion 10 is a right-hand thread and the second threaded portion 11 is a left-hand thread. Further, the first screw portion 10 and the second screw portion 11 are multi-threaded screws, and in the present embodiment, they are four-threaded screws, respectively.

Next, the relationship between the members of the opening device 1 will be described.
As shown in FIG. 1, the first screw portion 10 of the male screw member 5 is screwed into the screw hole 6a of the first female screw member 6 mounted on the holding portion 14 (FIG. 2) of the first arm member 2. ing. Further, the second screw portion 11 of the male screw member 5 is screwed into the screw hole 7a of the second female screw member 7 mounted on the holding portion 24 (FIG. 2) of the second arm member 3.

The narrow portion 17 of the first arm member 2 and the narrow portion 27 of the second arm member 3 are in close contact with each other, and the hole 18 of the base end portion 2a of the first arm member 2 and the second arm member 3 shown in FIG. The holes 28 of the base end portion 3a of the above are aligned with each other and are inserted by a common pin 4. The pin 4 is provided with a stopper. That is, in the first arm member 2 and the second arm member 3, the respective base end portions 2a and 3a are connected by a common pin 4, and the first arm member 2 and the second arm member 3 can rotate relative to each other around the base end portions 2a and 3a. is there.

When the operation unit 12 is rotated, the first arm member 2 and the second arm member 3 rotate around the base end portions 2a and 3a. At that time, the first female screw member 6 screwed with the first screw portion 10 of the male screw member 5 moves along the first screw portion 10 while rotating relative to the annular portions 14a and 14b. , The second female screw member 7 screwed with the second screw portion 11 moves along the second screw portion 11 while rotating relative to the annular portions 24a and 24b. At that time, the first female screw member 6 and the second female screw member 7 move along the male screw member 5 in the direction of approaching each other or the direction of separating from each other. That is, the first arm member 2 and the second arm member 3 can move along the male screw member 5. Here, only one of the first arm member 2 and the second arm member 3 may be movable along the male screw member 5.

When the angle A formed by both arm members 2 and 3 becomes zero, as shown in FIG. 1, the tip portion 2b of the first arm member 2, the tip portion 3b of the second arm member 3, and the curvature of the first arm member 2 The curved portion 3c of the second arm member 3 coincides with the portion 2c. As a result, the height dimension occupied by the tip portion 2b and the tip portion 3b in the opening device 1 becomes relatively small. Therefore, it is easy to arrange the tips 2b and 3b in the oral cavity of the patient.

Further, by rotating the operation unit 12 in the opposite direction, the first arm member 2 and the second arm member 3 rotate around the base end portions 2a and 3a, and the two arm members 2 and 3 are formed. The angle A becomes large. As a result, the distance between the tip portion 2b of the first arm member 2 and the tip portion 3b of the second arm member 3 is widened.

Since the first screw portion 10 and the second screw portion 11 of the male screw member 5 are multi-threaded screws, the first arm member 2 and the second arm member have a smaller number of rotations (rotation amount) than the one-threaded screw. The size of the angle A formed by 3 can be greatly changed. That is, in the opening device 1, by rotating the operation unit 12, the angle A formed by the first arm member 2 and the second arm member 3 can be quickly expanded to the state shown in FIG. It can be closed to the state shown in FIG. 3 (a).

Next, using the opening device 1 having such a structure, the dentist examines or treats the right region (right molar, right premolar, right canine) and incisors 35 and 36 in the patient's oral cavity. The case of doing so will be described. When examining or treating the right side region in the oral cavity, the opening device 1 has the first arm member 2 on the upper side and the second arm member 3 on the lower side.

Before arranging the opening device 1 in the oral cavity of the patient, the opening degree of the opening device 1 is reduced in advance as shown in FIGS. 1, 3 (a) and 5 (a). The tips 2b and 3b of the opening device 1 in a state where the opening degree is reduced are placed in the oral cavity of the patient as shown in FIG. 5A. That is, only the portion on the free end side of the curved portions 13 and 23 of the opening device 1 enters the oral cavity. In the state shown in FIG. 5A, the patient can easily insert the opening device 1 into the oral cavity with a small opening of the mouth.

Then, the tip portions 2b and 3b are moved to the back of the oral cavity, the occlusal portion 33a of the upper left molar 31a is brought into contact with the contact portion 8a of the first support portion 8, and the contact portion 9a of the second support portion 9 is brought into contact with the contact portion 8a. The occlusal portion 33b of the lower left molar 31b is brought into contact with the occlusal portion 33b. That is, the contact portions 8a and 9a are brought into a state of being bitten by the upper left molar 31a and the lower left molar 31b.

In this state, the operation unit 12 is rotated to gradually increase the angle A (FIG. 3 (b)) formed by the first arm member 2 and the second arm member 3, and as shown in FIG. 4, the contact portion 8a, The interval between 9a is widened, the upper left molar 31a and the lower left molar 31b are pressed by the contact portions 8a and 9a, and the patient's mouth is gradually expanded. You will be in a state where you can see or treat.

At this time, the opening device 1 is opened so that the first arm member 2 and the second arm member 3 form an angle A (intersection angle) about the base end portions 2a and 3a (pin 4). Therefore, the first support portion 8 of the first arm member 2 and the second support portion 9 of the second arm member 3 are also in an inclined state at an angle A, and support the upper and lower molars 31a and 31b of the patient in a reasonable posture. doing.

That is, as shown in FIG. 5B, when the patient's mouth is open, the occlusal portion 33a of the upper left molar 31a and the occlusal portion 33b of the lower left molar 31b are also inclined at an angle close to the angle A. Therefore, the support of the occlusal portion 33a of the upper left molar 31a and the occlusal portion 33b of the lower left molar 31b by the opening device 1 is stable.

In the state shown in FIG. 5B, the opening device 1 supports the upper left molar 31a and the lower left molar 31b, and the patient's mouth is maintained in an open state. Further, since the opening device 1 (first arm member 2, second arm member 3) has curved portions 13 and 23, the base end portion of the opening device 1 (base end portion 2a of the first arm member 2, the second arm). The base end portion 3a) of the member 3 is close to the cheek outside the oral cavity of the patient. That is, the proximal end portion (base end portions 2a, 3a) of the opening device 1 is retracted to the outside of the oral cavity on the left side of the patient, and the proximal end portion (base end portions 2a, 3a) of the opening device 1 is close to the left cheek. It becomes. Therefore, there are no obstacles in the area on the right side of the oral cavity, and the dentist can easily perform the area on the right side of the oral cavity (upper right molar 32a, lower right molar 32b, etc.) and incisors 35 and 36 (anterior teeth). Can be visually recognized and examined or treated.

Here, when the patient feels pain, the operation unit 12 is rotated so that the angle A becomes smaller. By rotating the operation unit 12, the angle A changes smoothly and continuously, the angle A is reduced when the patient wants to take a rest during the treatment, and the angle A is returned to the original size when the treatment is restarted. It can be easily returned. Further, the rotation operation of the operation unit 12 can be performed not only by the dentist but also by the patient himself.

On the contrary, when examining or treating the left side region (upper left molar 31a, lower left molar 31b, etc.) in the oral cavity, the opening device 1 supports the upper right molar 32a and the lower right molar 32b. In this case, as shown in FIG. 6, the opening device 1 is arranged in the patient's oral cavity so that the first arm member 2 is on the lower side and the second arm member 3 is on the upper side. Then, the contact portion 8a of the first support portion 8 of the first arm member 2 contacts the occlusal portion 34b of the lower right molar 32b, and the contact portion 9a of the second support portion 9 of the second arm member 3 is on the upper right. It abuts on the occlusal portion 34a of the molar teeth 32a.

Further, the proximal end portion (base end portion 2a, 3a) of the opening device 1 is retracted to the outside of the oral cavity on the right side of the patient, and the proximal end portion (base end portion 2a, 3a) of the opening device 1 is close to the right cheek. It becomes. Therefore, there are no obstacles in the left area of the oral cavity, and the dentist can easily cover the left area of the oral cavity (upper left molar 31a, lower left molar 31b, etc.) and incisors 35, 36 (anterior teeth). It is visible and can be examined or treated.

In the present embodiment, the pin 4 inserts the hole 18 of the base end portion 2a of the first arm member 2 and the hole 28 of the base end portion 3a of the second arm member 3, and the first arm member 2 and the second. An example is shown in which the base end sides (base end portions 2a, 3a) of the arm member 3 are rotatably connected to each other, but the first arm member 2 and the second arm member 3 are connected to the base end portions 2a, 3a. It does not matter if it extends further toward the base end side.

By the way, some patients may not have molars. In this case, the first support portion 8 and the second support portion 9 come into contact with the gums (maxillary lateral incision and mandibular lateral incisor) where the molars were present. In addition, the opening device 1 can also hold the lips by the first support portion 8 and the second support portion 9.

Further, as an example of "the distance between the free ends of the first arm member and the second arm member changes", there are the following Examples 1 and 2.

(Example 1)
As shown in FIGS. 7 (a) and 7 (b), the opening device 51 has a first arm member 52, a second arm member 53, and a male screw member 55. The first arm member 52 and the second arm member 53 have a curved portion like the first arm member 2 and the second arm member 3 shown in FIG. 1, but are curved because they are viewed from the side. The description of the state of being present is omitted.

The first arm member 52 has a free end 52a (free end side), and the second arm member 53 has a free end 53a (free end side). On the free ends 52a and 53a of each arm member, support portions (not shown) that support the upper and lower jaw portions in the oral cavity of the patient (support portions similar to the first support portion 8 and the second support portion 9 in FIG. 1). Is provided. Further, the first arm member 52 and the second arm member 53 are rotatably connected on the proximal end side 54. That is, the base end portions of the first arm member 52 and the second arm member 53 are rotatably connected to each other. Further, the free end side of the first arm member 52 and the second arm member 53 can be opened and closed.

A holding portion 57 integrated with the first arm member 52 is provided at a portion in the middle of the first arm member 52. A female screw member 58 is provided inside the holding portion 57. The female screw member 58 can be slidably moved in the holding portion 57. Alternatively, the holding portion 57 can be slidably moved with respect to the first arm member 52. In FIG. 7B, a state in which the holding portion 57 is slid and moved with respect to the first arm member 52 is depicted. The female screw member 58 is screwed (engaged) with the male screw member 55, and further, like the first female screw member 6 and the second female screw member 7 of the opening device 1 shown in FIG. 1, the holding portion 57 Relative rotation is possible with respect to.

The second arm member 53 is provided with a bearing 59. The bearing 59 is connected to the male screw member 55 so as to be relatively rotatable. That is, the male screw member 55 is engaged with the second arm member 53 via the bearing 59. The male screw member 55 idles with respect to the second arm member 53, and the positions of both do not change.

The male screw member 55 has an operation unit 56. By rotating the operation unit 56, the male screw member 55 rotates, and the position of the female screw member 58 screwed with the male screw member 55 can be changed. That is, the female screw member 58 can move along the male screw member 55, and the first arm member 52 integrated with the female screw member 58 moves the female screw member 58 along the male screw member 55. It moves relative to the male screw member 55.

Further, the male screw member 55 is supported by the bearing 59 of the second arm member 53 so as to be idling, and the second arm member 53 and the male screw member 55 do not move relative to each other. Therefore, when the male screw member 55 rotates, the first arm member 52 and the second arm member 53 rotate with the base end side 54a as the base point, and as shown in FIGS. 7 (a) and 7 (b), The distance between the free end 52a of the first arm member 52 and the free end 53a of the second arm member 53 changes.

(Example 2)
As shown in FIGS. 8A and 8B, the opening device 61 has a first arm member 62, a second arm member 63, and a male screw member 65. The first arm member 62 and the second arm member 63 have a curved portion like the first arm member 2 and the second arm member 3 shown in FIG. 1, but are curved because they are viewed from the side. The description of the state of being present is omitted.

The first arm member 62 has a free end 62a, and the second arm member 63 has a free end 63a. On the free ends 62a and 63a of each arm member, support portions (not shown) that support the upper and lower jaw portions in the oral cavity of the patient (support portions similar to the first support portion 8 and the second support portion 9 in FIG. 1). Is provided. Further, the first arm member 62 and the second arm member 63 are rotatably connected on the proximal end side 64.

An elongated hole (not shown) is provided in the middle of the first arm member 62. A male screw member 55 is inserted through the elongated hole. That is, the male screw member 55 is engaged with the first arm member 62 through an elongated hole (not shown) of the first arm member 62. An operation unit 66, which is a female screw, is screwed into the male screw member 55. The operation unit 66 is arranged between the first arm member 62 and the second arm member 63.

The second arm member 63 and the male screw member 65 are fixed so that they cannot rotate relative to each other. That is, the male screw member 55 and the second arm member 63 are engaged and integrated by the engaging means 69 (double nut or the like), and the second arm member 63 and the male screw member 65 do not move relative to each other.

When the operation unit 66 is rotated, the operation unit 66 moves from the position shown in FIG. 8 (a) to the position shown in FIG. 8 (b) along the male screw member 65, and the first arm member 62 moves from the position shown in FIG. 8 (b) along the male screw member 65. It is pressed by 66 and rotates about the base end side 64 as a base point. Therefore, as shown in FIG. 8B, the distance between the free end 62a of the first arm member 62 and the free end 63a of the second arm member 63 changes. When the operation unit 66 is rotated in the opposite direction, the first arm member 62 rotates following the operation unit 66 due to the action of gravity, and the free end 62a approaches the free end 63a of the second arm member 63.

1 Gag 2 First arm member 2a Base end portion (base end side) of the first arm member
2b Tip of first arm member (free end side)
3 Second arm member 3a Base end portion (base end side) of the second arm member
3b Tip of second arm member (free end side)
5 Male threaded member 6 1st female threaded member 7 2nd female threaded member 8 1st support 9 2nd support 10 Male threaded member 1st threaded 11 Male threaded member 2nd threaded 12 Operation section (rotational operation) Department)
13 Curved part of the first arm member 23 Curved part of the second arm member 31a Upper left molar 31b Lower left molar 33a Occlusal part of upper left molar 33b Occlusal part of lower left molar 32a Upper right molar 32b Lower right molar 34a Upper right large Occlusal part of molar tooth 34b Occlusal part of lower right molar

Claims (4)

It has a pair of first arm member and second arm member having a free end side and a base end side,
The base end side of the first arm member and the second arm member are rotatably connected to each other.
On the free end side of the first arm member and the second arm member, a first support portion and a second support portion are provided so as to come into contact with the occlusal portions of the upper and lower molars, respectively.
A common male screw member is provided in the middle of the first arm member and the second arm member.
The male screw member is provided with a first screw portion that is screwed with the first arm member side and a second screw portion that is screwed with the second arm member side.
Said first threaded portion and a second threaded portion, Ri Oh in upside-down screw,
The first female screw member and the second female screw member are screwed into the first screw portion and the second screw portion of the male screw member, respectively.
The male screw member is connected to the first arm member and the second arm member via the first female screw member and the second female screw member.
Wherein the first female screw member and the second female screw member, the opening device according to claim capable der Rukoto relative rotation with respect to the first arm member and the second arm member. The opening device according to claim 1, wherein a large-diameter rotary operation portion is provided between the first screw portion and the second screw portion of the male screw member. The portion of the first arm member and the second arm member on the free end side of the portion connected to the male screw member is curved toward the proximal end side in a plane intersecting the axial direction of the male screw member. The opening device according to claim 1 or 2 , wherein the opening device is characterized in that. The opening device according to any one of claims 1 to 3, wherein the first screw portion and the second screw portion of the male screw member are multi-threaded screws.

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