CN210643986U

CN210643986U - Oral lip distraction device for stomatology department

Info

Publication number: CN210643986U
Application number: CN201821905577.7U
Authority: CN
Inventors: 李玮玮; 周辉; 沈春荣
Original assignee: Individual
Current assignee: Individual
Priority date: 2018-11-19
Filing date: 2018-11-19
Publication date: 2020-06-02
Anticipated expiration: 2028-11-19

Abstract

The utility model relates to an oral lip distraction device for department of stomatology, at least including the first main part and the second main part of intercrossing setting, first main part and second main part are according to articulated mode interconnect, the one end of first main part is provided with first auxiliary handle, second main part one end is provided with second auxiliary handle, and first auxiliary handle with be provided with fixing device between the second auxiliary handle first main part for under the condition that the angle of second main part changes, fixing device is according to can making first main part for the fixed mode of angle on second theme respectively with be less than auxiliary handle and second auxiliary handle and connect. The utility model provides a department of stomatology uses lip distraction device passes through fixing device, has realized the department of stomatology uses lip distraction device's the function of strutting and keep strutting the size, this fixing device simple structure, easy operation is convenient.

Description

Oral lip distraction device for stomatology department

Technical Field

The utility model relates to the technical field of medical equipment, especially, relate to a department of stomatology is with lip distraction device.

Background

The department of stomatology is one of the medical discipline categories, and the main stomatology diseases include stomatoglossal facial skin sample, infection of epidermis submaxillary space, jaw face lymphangioma, dentate process development deformity, malignant tumor of maxillary sinus, jaw glost cytoma, chronic ethmoid sinusitis, mandibular retraction, tetracycline teeth, tongue white class and other diseases. In the prior art, the above diseases require observation of the diseased region and collection of a sample of the diseased region, so that a doctor generally needs to pull the lips of a patient to the left and right and up and down by using a lip spreader to expose certain parts of the oral cavity or teeth during treatment. However, in the process of spreading the lips, the existing lip spreading device is not beneficial to spreading the patient's dental articulations, the patient is difficult to apply force to the patient when the patient closes the dental articulations tightly, if the patient's dental articulations are forced to be spread, the patient's tissues and teeth in the mouth are easily damaged, and some lip spreading devices are not beneficial to observing the mouth, so that the visual field of a doctor is limited during treatment. The limited visual field in the treatment process can prolong the treatment time, and bring great inconvenience to medical care personnel and patients.

Chinese patent (publication number is CN205359418U) discloses a lip distraction device for department of stomatology, including curved bar and straight-bar, straight-bar end is equipped with circular end, circular end one side is equipped with the horizontal pole, be equipped with the connecting axle on the circular end, the curved bar passes through connecting axle and straight-bar rotation connection, the straight-bar middle part is equipped with interior telescopic link, the curved bar middle part is equipped with outer telescopic link, outer telescopic link and interior telescopic link sliding connection, outer telescopic link top is equipped with the motor, curved bar and straight-bar below all are equipped with the backup pad, be equipped with pressure sensitive induction system in the backup pad, the horizontal pole top is equipped with the controller, be equipped with the button on the controller, the horizontal pole below is equipped with the light. Although the available oral lip of oral cavity that this patent provided struts device does not enlarge the observation field of vision at the intermediate position through setting up curved rod, however, use the structure of the outer telescopic link of motor control and interior telescopic link for whole oral lip struts device structure is complicated, and the oral lip struts the in-process moreover, and not only patient's oral cavity can secrete liquid, and the doctor also can be through shower nozzle injection distilled water in order to wash the oral cavity, consequently uses risk such as electric machine device probably appears leaking, short circuit.

For example, chinese patent CN202184815U (published japanese 20120411) discloses an auxiliary device for oral and oral cavity department, which is realized by: lip distraction device, the arc support arm is whole to be a semicircle form, is equipped with the ring at the front end of arc support arm position placed in the middle, is equipped with the back lip groove at the rear end of arc support arm, and the back lip groove extends forward and is provided with the buccal hook, and the front end of hanging the ware at the buccal hook extends forward and is equipped with preceding lip groove. The utility model discloses simple structure, operation convenient to use during the use, puts into the patient mouth with the arc support arm, and the cheek that sets up about with hangs the ware fixed, has utilized the elastic force effect holding power of arc support arm, has avoided rigid tractive, has reduced patient's misery, has more made things convenient for doctor's actual operation.

Chinese patent CN205359418U (announcement day 20160706) discloses a lip distraction device for department of stomatology, including curved bar and straight-bar, straight-bar end is equipped with circular end, circular end one side is equipped with the horizontal pole, be equipped with the connecting axle on the circular end, the curved bar passes through connecting axle and straight-bar rotation connection, the straight-bar middle part is equipped with interior telescopic link, the curved bar middle part is equipped with outer telescopic link, outer telescopic link and interior telescopic link sliding connection, outer telescopic link top is equipped with the motor, curved bar and straight-bar below all are equipped with the backup pad, be equipped with pressure sensitive induction system in the backup pad, the horizontal pole top is equipped with the controller, be equipped with the button on the controller, the horizontal pole below is equipped with the light. The utility model discloses guaranteeing to use comfortablely, under the firm reliable condition, improved the field of vision of observing, still can provide the illumination for patient's oral cavity is inside to whole device is when using, and is simple and convenient, and intelligence is high-efficient, saves a large amount of valuable time, is fit for promoting.

SUMMERY OF THE UTILITY MODEL

To the not enough of prior art existence, the utility model provides a department of stomatology is with lip distraction device includes the first main part and the second main part that intercrossing set up at least. The first body and the second body are connected to each other in a hinged manner. One end of the first main body is provided with a first auxiliary handle, and one end of the second main body is provided with a second auxiliary handle. A fixing device is arranged between the first auxiliary handle and the second auxiliary handle. When the angle of the first body with respect to the second body is changed, the fixing device is connected to the first assist handle and the second assist handle, respectively, so that the angle of the first body with respect to the second body is fixed.

According to a preferred embodiment, the fixing means comprise at least a connecting rod and a groove. One end of the connecting rod is connected to the first auxiliary handle in a hinged mode. The other end of the connecting rod is a convex part which can slide along the groove. The groove is a sliding groove which extends along the length direction of the second auxiliary handle and is provided with at least part of limiting parts. Under the condition that the connecting rod slides along the groove through the convex part, the limiting part is abutted against the convex part in a mode of limiting the connecting rod to slide along the groove.

According to a preferred embodiment, the connecting rod comprises at least a first short rod and a second short rod. One end of the first short rod is connected with the convex part. One end of the second short rod is connected with the first auxiliary handle in a hinged mode. The first short rod is nested in the second short rod in a reciprocating sliding mode along the axial direction of the second short rod.

According to a preferred embodiment, the first short bar is provided with a limiting hole. The second short rod is provided with a positioning piece. The positioning piece is abutted against the limiting hole in a mode of penetrating through the limiting hole.

According to a preferred embodiment, the other ends of the first and second bodies are respectively provided with an arc-shaped arm for spreading the opening lip. The arc-shaped support arms are respectively connected with the first main body and the second main body in a pivoting mode.

According to a preferred embodiment, the ends of the arc-shaped arms, which are connected to the first body and the second body, respectively, are provided with turning portions. The ends of the first and second bodies have a fixed shaft. The upper end and the lower end of the fixed shaft are provided with protrusions extending along the radial direction of the fixed shaft. The protrusion and the rotating part abut against each other.

According to a preferred embodiment, the rotating part is a hollow sleeve matching the fixed shaft. The rotating part is nested on the fixed shaft in a mode of pivoting around the fixed shaft.

According to a preferred embodiment, a damping strip is arranged between the rotating part and the fixed shaft. The damping stripes are uneven strips arranged on the surface of the inner wall of the rotating part and/or the surface of the fixed shaft.

According to a preferred embodiment, the arc-shaped arm comprises at least a front lip groove, a rear lip groove and a cheek holder. The back lip groove is positioned at the end parts of the two sides of the arc-shaped support arm. The back lip groove is along the arc support arm extends to the centre of arc support arm has set gradually cheek hangs the ware with the front lip groove.

According to a preferred embodiment, the first body and the second body are respectively provided with a strip-shaped hole at the intersection of the first body and the second body. The strip-shaped holes are fixed through the angle locking parts. The angle locking part is nested in the strip-shaped hole in a sliding mode along the strip-shaped hole. When the angle locking portion is locked, the first body is connected to the second body in such a manner that the angle of the first body is fixed relative to the second body.

The utility model has the advantages that:

1. the utility model provides a stomatological lip opening device, which realizes the functions of opening and keeping the opening size of the stomatological lip opening device through a fixing device, and the fixing device has simple structure and simple and convenient operation;

2. the utility model provides a department of stomatology lip distraction device passes through the rotation portion that fixing device passes through the arc support arm, realized the arc support arm can with first main part and second main part pivot can rotate in order to avoid sheltering from medical staff's observation field of vision at the in-process of operation, also can enlarge simultaneously and block medical staff operating space.

Drawings

Fig. 1 is a schematic structural view of a preferred embodiment of the present invention;

fig. 2 is a schematic structural view of a preferred groove of the present invention; and

fig. 3 is a schematic structural view of a preferred arc-shaped support arm according to the present invention.

List of reference numerals

1: first body 2: second body 3: first auxiliary handle

4: second auxiliary handle 5: the fixing device 6: connecting rod

7: groove 8: arc support arm 9: rotating part

10: fixed shaft 11: strip-shaped hole 12: angle locking part

61: projection 62: first short bar 63: second short bar

71: the stopper 81: anterior lip groove 82: posterior lip groove

83: the cheek hook 621: the limit hole 631: locating piece

Detailed Description

In the description of the present invention, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. are used in the orientation or positional relationship indicated on the basis of the drawings, it is only for convenience of description and simplification of the description, but it is not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

In the description of the present invention, it should also be understood that unless otherwise explicitly specified or limited, "over" or "under" a first feature may include the first and second features being in direct contact, and may also include the first and second features not being in direct contact but being in contact with each other through another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The following detailed description is made with reference to the accompanying drawings.

As shown in fig. 1, the utility model provides a lip spreader for stomatology department, which at least comprises a first body 1 and a second body 2 which are arranged in an intercrossing way. The first body 1 and the second body 2 are connected to each other in a hinged manner. One end of the first body 1 is provided with a first auxiliary handle 3, and one end of the second body 2 is provided with a second auxiliary handle 4. A fixing means 5 is provided between the first auxiliary handle 3 and the second auxiliary handle 4. When the angle of the first body 1 with respect to the second body 2 is changed, the fixing device 5 is connected to the first assist handle 3 and the second assist handle 4, respectively, so that the angle of the first body 1 with respect to the second body 2 can be fixed. Preferably, the first body 1 and the second body 2 are provided at their mutual intersection with a hinge means, such as a rotating shaft, a screw, etc., about which the first body 1 and the second body 2 can rotate. Preferably, for example, when the angle of the first body 1 with respect to the second body 2 is changed from 0 ° to 90 °, the first and second auxiliary handles 3 and 4 are also rotated with the first and second bodies 1 and 2, and the fixing means 5 can keep the relative angle between the first and second bodies 1 and 2 constant by restricting the relative rotation of the first and second bodies 1 and 2 in such a manner that the relative movement of the first and second auxiliary handles 3 and 4 is restricted. Preferably, the second body 2 rotates about the hinge means by not more than 180 ° with the first body 1 stationary. Preferably, an elastic part may be provided between the first auxiliary handle 3 and the second auxiliary handle 4 or between the first body 1 and the second body 2, and a relative angle between the first auxiliary handle 3 and the second auxiliary handle 4 or between the first body 1 and the second body 2 is maintained at 0 ° by the elastic part, and when the medical staff grasps the first auxiliary handle 3 and the second auxiliary handle 4, the relative angle between the first body 1 and the second body 2 becomes smaller until the relative angle between the first body 1 and the second body 2 becomes 0 °.

According to a preferred embodiment, the fixing means 5 comprise at least a connecting rod 6 and a groove 7. One end of the connecting rod 6 is connected to the first auxiliary handle 3 in a hinged manner. The other end of the connecting rod 6 is a convex part 61 which can slide along the groove 7. The groove 7 is a sliding groove extending along the length direction of the second auxiliary handle 4 and at least provided with a part of a limiting part 71. In the case where the connecting rod 6 slides along the groove 7 by the projection 61, the stopper portion 71 abuts against the projection 61 in such a manner as to be able to restrict the connecting rod 6 from sliding along the groove 7. Preferably, the end of the connecting rod 6 can rotate around the first auxiliary handle 3/the second auxiliary handle 4, so that the connecting rod 6 can slide along the groove 7, and can expand the first auxiliary handle 3 and the second auxiliary handle 4 while the connecting rod 6 slides along the groove 7, thereby changing the size of the relative angle between the first body 1 and the second body 2. Preferably, the protrusion 61 may be a smooth arc, circle, ellipse, or other slidable protrusion, the limiting portion 71 can block the protrusion 61 and limit the movement of the protrusion, and the limiting portion 71 may be a plurality of positioning holes matching with the protrusion 61 or a plurality of limiting segments with different concave-convex shapes, as shown in fig. 2. Preferably, the projection 61 can be restricted from sliding when the projection 61 enters the stopper portion 71.

According to a preferred embodiment, the connecting rod 6 comprises at least a first short rod 62 and a second short rod 63. One end of the first short bar 62 is connected to the boss 61. One end of the second short bar 63 is connected to the first auxiliary handle 3 in an articulated manner. The first short rod 62 is nested in the second short rod 63 in such a manner as to slide reciprocally in the axial direction of the second short rod 63.

According to a preferred embodiment, the first short bar 62 is provided with a stopper hole 621. The second short bar 63 is provided with a positioning member 631. The positioning member 631 abuts against the limiting hole 621 in a manner of penetrating the limiting hole 621. Preferably, after the limiting part 71 limits the movement of the convex part 61, the connecting rod 6 abuts against the groove 7 to limit the relative change of the angles of the first auxiliary handle 3 and the second auxiliary handle 4, and after the positioning piece 631 leaves the limiting hole 621, the first short rod 62 can move towards the second short rod 62 along the axial direction of the second short rod 63, shortening the length of the connecting rod 6, so that the convex part 61 leaves the limiting part 71 to change the relative angle between the first body 1 and the second body 2.

According to a preferred embodiment, the other ends of the first body 1 and the second body 2 are provided with respective arc-shaped arms 8 for spreading the lips. The arc-shaped arms 8 are pivotally connected to the first body 1 and the second body 2, respectively.

According to a preferred embodiment, the ends of the arc-shaped arms 8, which are connected to the first body 1 and the second body 2, respectively, are provided with turning parts 9. The ends of the first body 1 and the second body 2 have a fixed shaft 10. The upper and lower ends of the fixing shaft 10 are provided with protrusions extending in the radial direction of the fixing shaft 10. The protrusion abuts against the rotating part 9.

According to a preferred embodiment, the rotating part 9 is a hollow sleeve matching the fixed shaft 10. The rotating part 9 is nested on the fixed shaft 10 in such a manner as to pivot about the fixed shaft 10.

Preferably, the curved arm 8 can be adapted to fit the lips of the patient and the curved arm 8 can be pivoted about the fixed axis 10 so that the first body 1 and the second body 2 can be pivoted along the curved arm 8 to avoid obstructing the view of the doctor.

According to a preferred embodiment, damping strips are provided between the rotating part 9 and the stationary shaft 10. The damping stripes are uneven strips arranged on the inner wall surface of the rotating part 9 and/or the surface of the fixed shaft 10.

According to a preferred embodiment, arcuate arm 8 includes at least anterior lip channel 81, posterior lip channel 82, and cheek holder 83. The rear lip grooves 82 are located at the ends of both sides of the arc-shaped arm 8. The rear lip groove 82 is provided with a cheek hanger 83 and a front lip groove 81 in order along the arc arm 8 to the middle of the arc arm 8. Preferably, the anterior lip groove 81, the posterior lip groove 82 and the cheek hangers 83 are made of a soft elastic material, as shown in fig. 3. Preferably, the anterior lip groove 81, the posterior lip groove 82 and the cheek hanger 83 can be closely fitted to the patient's lips, thereby protecting the patient's lips. The arc-shaped support arm 8 is integrally formed into a semicircle, and a front circular ring is arranged at the center of the front end of the semicircular arc-shaped support arm 8. At the rear end of the arc-shaped arm 8, a rear lip groove 82 is provided, extending forward from said rear lip groove 82, a cheek hook 83 is provided, and at the front end of said cheek hook 83, also in a substantially central position of the arc-shaped arm 8, between the front ring and the rear lip groove 82, a front lip groove 81 is provided.

According to a preferred embodiment, the first body 1 and the second body 2 are provided with a strip-shaped hole 11 at the intersection of the first body 1 and the second body 2, respectively. The strip-shaped hole 11 is fixed by the angle locking portion 12. The angle locking portion 12 is nested in the bar-shaped hole 11 in such a manner as to slide along the bar-shaped hole 11. When the angle locking part 12 is locked, the first body 1 is connected to the second body 2 in such a manner that its angle is fixed with respect to the second body 2. Preferably, the angle locking part 12 slides along the bar-shaped hole 11, so that the distance between the angle locking part 12 and the arc-shaped arm 8 is adjustable, i.e. the distance between the arc-shaped arm 8 connected with the first main body 1 and the arc-shaped arm 8 connected with the second main body 2 and the angle locking part 12 can be adjusted respectively to adapt to the problem that the upper and lower lips of the patient protrude relatively. Preferably, the angle locking part 12 may be one of a screw, a positioning pin, and a rotation shaft.

For the convenience of understanding, the usage of the oral lip distractor of the present invention will be discussed.

When the patient carries out the lip and struts, because be provided with the elasticity portion between first auxiliary handle 3 and the second auxiliary handle for relative angle between first main part 1 and the second main part 2 is 0, consequently can with the utility model discloses an arc support arm 8 imbeds between the lip of patient, then medical staff is through holding first auxiliary handle 3 and second auxiliary handle 4 tightly for thereby relative angle between first main part 1 and the second main part 2 increases and drives arc support arm 8 and strut patient's lip. In the process of opening, the front lip groove 81, the rear lip groove 82 and the cheek hanging device 83 of the arc-shaped support arm 8 are matched with the lips of the patient, and the lips of the patient can be protected, so that the discomfort of the patient is relieved. At the same time, the connecting rod 6 of the fixing device 5 slides along the groove 7 on the first auxiliary handle 3/the second auxiliary handle 4. Under the condition that can make medical staff observe patient's oral cavity, the protruding portion 61 card of connecting rod 6 goes into the spacing portion 71 of recess 7 at patient's lips struts the condition that can make medical staff observe patient's oral cavity, insert setting element 631 in spacing hole 631 simultaneously, the length of fixed first quarter butt 62, first main part 1 and second main part 2 keep relative angle invariable, thereby the size that patient's lips propped open keeps fixed, avoid medical staff to hold first auxiliary handle 3 and second auxiliary handle 4 at the in-process that the lips propped open always, and adopt fixing device 5 can also keep patient's lips to strut the stability of angle. The first body 1 and the second body 2 are pivotally connected with the arc-shaped arm 8, and the view of a doctor can be prevented from being blocked by the first body 1 and the second body 2 by rotating the first body 1 and the second body 2 during the lip opening process. After the lip struts, through extracting setting element 631, first quarter butt 62 slides along the axial direction of second quarter butt 63 for convex part 61 breaks away from spacing portion 71, and first main part 1 and the automatic closure of second main part 2 under the effect of elasticity portion, arc support arm 8 is not closely laminating with patient's lip, is convenient for the utility model discloses department breaks away from patient's lip.

It should be noted that the above-mentioned embodiments are exemplary, and those skilled in the art can devise various solutions in light of the present disclosure, which are also within the scope of the present disclosure and fall within the scope of the present disclosure. It should be understood by those skilled in the art that the present specification and drawings are illustrative only and are not limiting upon the claims. The scope of the invention is defined by the claims and their equivalents.

Claims

1. An orolip distractor for stomatology, comprising at least a first body (1) and a second body (2) arranged crosswise to each other, characterized in that the first body (1) and the second body (2) are connected to each other in an articulated manner, wherein,

a first auxiliary handle (3) is arranged at one end of the first main body (1), a second auxiliary handle (4) is arranged at one end of the second main body (2), a fixing device (5) is arranged between the first auxiliary handle (3) and the second auxiliary handle (4),

in case of a change of the angle of the first body (1) with respect to the second body (2), the fixing means (5) are connected to the first auxiliary handle (3) and to the second auxiliary handle (4), respectively, in such a way as to enable the angle of the first body (1) with respect to the second body (2) to be fixed,

the fixing device (5) comprises at least a connecting rod (6) and a groove (7), wherein,

one end of the connecting rod (6) is connected with the first auxiliary handle (3) in a hinged mode, the other end of the connecting rod (6) is provided with a convex part (61) capable of sliding along the groove (7),

the groove (7) is a sliding groove which extends along the length direction of the second auxiliary handle (4) and is provided with at least a part of limiting part (71),

the stopper (71) abuts against the protrusion (61) in such a manner as to restrict the connecting rod (6) from sliding along the groove (7) when the connecting rod (6) slides along the groove (7) by the protrusion (61),

the end of the connecting rod (6) can rotate around the first auxiliary handle (3)/the second auxiliary handle (4), so that the connecting rod (6) can slide along the groove (7), and the first auxiliary handle (3) and the second auxiliary handle (4) can be propped open while the connecting rod (6) slides along the groove (7), thereby changing the size of the relative angle between the first body (1) and the second body (2).

2. The orolip spreading device for oral use according to claim 1, wherein said connecting rod (6) comprises at least a first short rod (62) and a second short rod (63), one end of said first short rod (62) being connected to said boss (61) and one end of said second short rod (63) being connected to said first auxiliary handle (3) in a hinged manner, wherein,

the first short rod (62) is nested in the second short rod (63) in a manner of sliding back and forth along the axial direction of the second short rod (63).

3. The oral lip spreading device according to claim 2, wherein the first short bar (62) is provided with a stopper hole (621), and the second short bar (63) is provided with a positioning member (631),

the positioning piece (631) is abutted against the limiting hole (621) in a mode of penetrating through the limiting hole (621).

4. The oral lip spreading device according to claim 3, wherein the other ends of the first body (1) and the second body (2) are respectively provided with arc-shaped arms (8) for spreading the lips,

the arc-shaped support arm (8) is respectively connected with the first main body (1) and the second main body (2) in a pivoting mode.

5. The oral lip spreading device according to claim 4, wherein ends of the arc-shaped arms (8) connected to the first body (1) and the second body (2), respectively, are provided with rotating portions (9), wherein,

the ends of the first body (1) and the second body (2) are provided with a fixed shaft (10), the upper and lower ends of the fixed shaft (10) are provided with protrusions extending in the radial direction of the fixed shaft (10), and the protrusions and the rotating part (9) abut against each other.

6. The oral lip spreading device according to claim 5, wherein the rotating part (9) is a hollow sleeve matching the fixed shaft (10), the rotating part (9) being nested on the fixed shaft (10) in a manner to pivot around the fixed shaft (10).

7. The orolip spreading device for the department of stomatology according to claim 6, characterized in that a damping stripe is arranged between the rotating part (9) and the fixed shaft (10), and the damping stripe is an uneven stripe arranged on the inner wall surface of the rotating part (9) and/or the surface of the fixed shaft (10).

8. The orolip spreading device of claim 7, wherein said arc-shaped arm (8) comprises at least a front lip groove (81), a rear lip groove (82) and a cheek holder (83), wherein,

the back lip groove (82) is located the tip of arc support arm (8) both sides, back lip groove (82) are followed arc support arm (8) extend to the centre of arc support arm (8) has set gradually cheek hangs ware (83) with preceding lip groove (81).

9. The orolip spreading device according to claim 8, wherein said first body (1) and said second body (2) are respectively provided with a strip-shaped hole (11) at the intersection of said first body (1) and said second body (2), said strip-shaped hole (11) being fixed by an angle locking portion (12), and said angle locking portion (12) being nested in said strip-shaped hole (11) in such a manner as to slide along said strip-shaped hole (11),

when the angle locking part (12) is locked, the first body (1) is connected to the second body (2) in such a way that the angle thereof is fixed relative to the second body (2).