Supporting auxiliary device applied to hard bronchoscope operation

Abstract

The invention discloses a supporting auxiliary device applied to hard bronchoscopy. The supporting auxiliary device comprises a head pillow structure, a back pillow structure, a neck pillow structure and a controller. The novel hard bronchoscope operation pillow is reasonable in overall design, simple in structure and convenient to operate, by means of effective combination of the head pillow structure, the back pillow structure and the neck pillow structure, when a medical worker conducts a hard bronchoscope operation on a patient, the novel hard bronchoscope operation pillow only needs to be placed on an operating bed, the patient needing the hard bronchoscope operation lies on the upper portion of the novel hard bronchoscope operation pillow, and the medical worker can conveniently conduct the hard bronchoscope operation. And then the head, the neck and the neck of the patient are adjusted to the required height and angle through the structure, so that the labor intensity of medical personnel is reduced, the risk of related operations is also reduced, the success rate of the related operations is also improved, and the working efficiency is improved. And great convenience is brought to body position adjustment and positioning work of patients needing hard bronchoscope related operations.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to a support and assistance device used in rigid bronchoscopy. Background Technology

[0002] Rigid bronchoscopes are a type of modern medical equipment. With the development of medicine, rigid bronchoscopes are constantly being developed and improved. Rigid bronchoscopes maintain airway patency and have side ports at the operating end for connection to a ventilator; therefore, they are also called "ventilation bronchoscopes" and are widely used in related surgeries.

[0003] When performing rigid bronchoscopy, medical staff need to have the patient lie supine on the operating table, adjust the height and angle of the patient's head, and place a positioning pad under the patient's neck and back. The positioning pad is mainly used to adjust and fix the patient's position. The positioning of the patient during surgery is an important guarantee for the smooth progress of the operation.

[0004] When performing the aforementioned surgical procedures on patients, medical staff need to adjust the patient's position appropriately after general anesthesia, and effectively adjust the height of the patient's head, neck, and shoulders. Currently, most hospitals place several pillows under the patient's head, neck, and shoulders after general anesthesia. Since the patient is under general anesthesia, this not only easily causes unnecessary damage to the patient, but also brings great inconvenience to medical staff.

[0005] In addition, the pillow is very easy to move during the operation. After the pillow moves, the medical staff need to adjust the patient's position to the correct position in time. It is also difficult to keep the patient in a relatively stable surgical position during the operation. This method not only increases the labor intensity of medical staff, but also increases the risk of related surgeries and reduces the success rate of related surgeries. It also brings great inconvenience to the positioning and positioning of patients who need to undergo rigid bronchoscopy. Summary of the Invention

[0006] To address the problems existing in the prior art, this invention aims to provide a support and assistance device for rigid bronchoscopy. This device features a reasonable overall design, simple structure, and convenient operation. It effectively combines a headrest, backrest, and neckrest structure. During rigid bronchoscopy, medical staff simply place this device on the operating table, place the patient supine on it, and then adjust the patient's head, neck, and cervical spine to the required height and angle. This method not only reduces the workload of medical staff but also lowers the risks of the procedure and improves the success rate, significantly facilitating patient positioning and alignment for rigid bronchoscopy.

[0007] To solve the above technical problems, the present invention adopts the following technical solution: A support and assistance device for use in rigid bronchoscopy, characterized in that it includes: A headrest structure is placed under the patient's head during a rigid bronchoscopy procedure performed by a medical staff member. The headrest structure is located at the head of the operating table where the medical staff performs the rigid bronchoscopy procedure. A back support structure is placed under the patient's back during a rigid bronchoscopy procedure performed by a medical staff member. The back support structure is located in the middle of the operating table on which the medical staff perform the rigid bronchoscopy procedure. A neck pillow structure is placed under the patient's neck during a rigid bronchoscopy procedure performed by a medical staff member. The neck pillow structure is set on the operating table where the medical staff performs the rigid bronchoscopy procedure and is located between the head pillow structure and the back pillow structure. One end of the neck pillow structure is detachably connected to the head pillow structure and the other end is detachably connected to the back pillow structure. A controller is used to adjust the height and angle of the headrest structure, backrest structure, and neck pillow structure to adjust the patient to the position required by medical staff. The controller is communicatively connected to the headrest structure, backrest structure, and neck pillow structure respectively.

[0008] In a preferred embodiment of the present invention, the headrest structure includes An annular air cushion for effectively fixing the head of a patient undergoing rigid bronchoscopy, with an annular base plate on the underside of the annular air cushion. A medical professional uses a head angle adjustment cylinder assembly that can adjust the head of a patient undergoing rigid bronchoscopy to the required angle. The head angle adjustment cylinder assembly is communicatively connected to a controller, and its output shaft is connected to an annular base plate. A head angle adjusting electric cylinder assembly support plate for effectively supporting the head angle adjusting electric cylinder assembly, wherein the lower end of the head angle adjusting electric cylinder assembly is disposed on the head angle adjusting electric cylinder assembly support plate. A medical professional can use a head height adjustment cylinder assembly to adjust the head of a patient undergoing rigid bronchoscopy to the required height. The head height adjustment cylinder assembly is communicatively connected to a controller, and its output shaft is connected to the head angle adjustment cylinder assembly support plate. A headrest base plate placed at the head of the operating table by a medical staff member during a rigid bronchoscopy procedure. The lower end of the head height adjustment electric cylinder assembly is located on the headrest base plate.

[0009] In a preferred embodiment of the present invention, the backrest structure includes A back support air cushion for effectively supporting the back of a patient undergoing rigid bronchoscopy, wherein a back support air cushion base plate is provided on the underside of the back support air cushion. A medical professional can use a shoulder height adjustment cylinder assembly to adjust the shoulder of a patient undergoing rigid bronchoscopy to the required height. The shoulder height adjustment cylinder assembly is connected to a controller, and its output shaft is connected to the back air cushion base plate. A shoulder pillow base plate is placed in the middle of the operating table by a medical staff member during a rigid bronchoscopy procedure on a patient. The lower end of the shoulder height adjustment electric cylinder assembly is set on the shoulder pillow base plate.

[0010] In a preferred embodiment of the present invention, a thoracic spine auxiliary pillow is provided on the shoulder pillow base plate and at the position of the patient's thoracic spine, which can effectively support and protect the patient's thoracic spine.

[0011] In a preferred embodiment of the present invention, the neck pillow structure includes A neck support air cushion for effectively supporting the neck of a patient undergoing rigid bronchoscopy, wherein a neck support air cushion base plate is provided on the lower side of the neck support air cushion. A medical professional can use a neck height adjustment electric cylinder assembly to effectively adjust the height of the neck support air cushion and enable the neck support air cushion to effectively support the neck of a patient undergoing rigid bronchoscopy. The neck height adjustment electric cylinder assembly is communicatively connected to a controller, and its output shaft is connected to the base plate of the neck air cushion. A neck pillow base is placed on the operating table between the head pillow base and the shoulder pillow base during a rigid bronchoscopy procedure performed by a medical staff member. The lower end of the neck height adjustment electric cylinder assembly is located on the neck pillow base.

[0012] In a preferred embodiment of the present invention, a first dovetail slide foot is provided on the side of the neck pillow substrate near the head pillow substrate, and a first dovetail groove is provided on the side of the head pillow substrate near the neck pillow substrate to cooperate with the first dovetail slide foot. The first dovetail slide foot can slide along the first dovetail groove to adjust the distance between the neck pillow substrate and the head pillow substrate.

[0013] In a preferred embodiment of the present invention, a first positioning screw is provided on one side of the headrest base plate, which locks and positions the first dovetail slide foot after it slides along the first dovetail groove to the required position. A first threaded hole that cooperates with the first positioning screw is provided on one side of the headrest base plate, and the first positioning screw passes through the first threaded hole and presses against one side of the first dovetail slide foot.

[0014] In a preferred embodiment of the present invention, a second dovetail slide foot is provided on the side of the neck pillow substrate near the shoulder pillow substrate, and a second dovetail groove is provided on the side of the shoulder pillow substrate near the neck pillow substrate to cooperate with the second dovetail slide foot. The second dovetail slide foot can slide along the second dovetail groove to adjust the distance between the neck pillow substrate and the shoulder pillow substrate.

[0015] In a preferred embodiment of the present invention, a second positioning screw is provided on one side of the shoulder pillow base plate, which locks and positions the second dovetail slide foot after it slides along the second dovetail groove to the required position. A second threaded hole that cooperates with the second positioning screw is provided on one side of the shoulder pillow base plate, and the second positioning screw passes through the second threaded hole and presses against one side of the second dovetail slide foot.

[0016] Compared with existing technologies, this invention has a reasonable overall design, simple structure, and convenient operation. It effectively combines a headrest structure, a back pillow structure, and a neck pillow structure. When performing rigid bronchoscopy on patients, medical staff only need to place this invention on the operating table, place the patient supine on top of it, and then use this structure to adjust the patient's head, neck, and cervical spine to the required height and angle. This method not only reduces the labor intensity of medical staff but also reduces the risks of related surgeries and improves the success rate of related surgeries, bringing great convenience to the positioning and care of patients undergoing rigid bronchoscopy. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of the present invention.

[0019] Figure 2 A schematic diagram of the structure of this invention with the patient lying supine. Detailed Implementation

[0020] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below with reference to specific illustrations.

[0021] Reference Figure 1 and Figure 2 As shown in the figure, a support device for use in rigid bronchoscopy is provided, including a headrest structure 100, a backrest structure 200, a neck pillow structure 300, and a controller.

[0022] The headrest structure 100 is a support pad placed under the patient's head 410 when medical staff perform rigid bronchoscopy on the patient 400. The headrest structure 100 is located at the head of the operating table where medical staff perform rigid bronchoscopy on the patient.

[0023] The back pillow structure 200 is a support pad placed under the patient's back 430 when medical staff perform rigid bronchoscopy on the patient 400. The back pillow structure 200 is located in the middle of the operating table where medical staff perform rigid bronchoscopy on the patient 400.

[0024] The neck pillow structure 300 is a support pad placed under the patient's neck 420 during rigid bronchoscopy surgery performed by medical staff on the patient 400. The neck pillow structure 300 is set on the operating table where medical staff perform rigid bronchoscopy surgery on the patient 400, and is located between the head pillow structure 100 and the back pillow structure 200. One end of the neck pillow structure 300 is detachably connected to the head pillow structure 100, and the other end is detachably connected to the back pillow structure 200.

[0025] The headrest structure 100, backrest structure 200, and neck pillow structure 300 can all be used individually according to the needs of medical staff, and can provide effective support for the head 410, back 430, and neck 420 of the patient 400 respectively, further improving the practicality of the support and assistance device.

[0026] The controller is used to control the headrest structure 100, backrest structure 200 and neck pillow structure 300 to adjust the height and angle of the patient to the position required by the medical staff. The controller is communicatively connected to the headrest structure 100, backrest structure 200 and neck pillow structure 300 respectively.

[0027] The headrest structure 100 includes an annular air cushion 110, a head angle adjustment electric cylinder assembly, a head angle adjustment electric cylinder assembly support plate 140, a head height adjustment electric cylinder assembly, and a headrest base plate 160.

[0028] The annular air cushion 110 is used to effectively fix the head 410 of the patient 400 undergoing rigid bronchoscopy. An annular base plate 120 is provided on the lower side of the annular air cushion 110, and a head fixation strap 111 is provided on the rear side of the annular air cushion 110 to stably fix the patient's head 410 on the annular air cushion 110, which further improves the stability between the patient's head 410 and the annular air cushion 110.

[0029] The head angle adjustment electric cylinder assembly allows medical staff to adjust the head 410 of the patient 400 undergoing rigid bronchoscopy to the required angle. The head angle adjustment electric cylinder assembly is connected to the controller, and its output shaft is connected to the annular base plate 120.

[0030] The head angle adjustment electric cylinder assembly support plate 140 is used to effectively support the head angle adjustment electric cylinder assembly, and the lower end of the head angle adjustment electric cylinder assembly is set on the head angle adjustment electric cylinder assembly support plate 140.

[0031] The head angle adjustment electric cylinder assembly includes at least two head angle adjustment electric cylinders, which are respectively located at the front and rear ends of the head angle adjustment electric cylinder assembly support plate 140. A head angle adjustment electric cylinder assembly protective sleeve 130 is provided on the outside of the head angle adjustment electric cylinder assembly. The head angle adjustment electric cylinder assembly protective sleeve 130 covers the outside of the head angle adjustment electric cylinder assembly, with its upper end set on the annular base plate 120 and its lower end set on the head angle adjustment electric cylinder assembly support plate 140.

[0032] The head height adjustment electric cylinder assembly allows medical staff to adjust the head of patients undergoing rigid bronchoscopy to the required height. The head height adjustment electric cylinder assembly is connected to the controller, and its output shaft is connected to the head angle adjustment electric cylinder assembly support plate 140. The head height adjustment electric cylinder assembly can effectively adjust the height of the patient's head.

[0033] The headrest base plate 160 is placed at the head of the operating table by medical staff when performing rigid bronchoscopy on patient 400. The lower end of the head height adjustment electric cylinder assembly is set on the headrest base plate 160.

[0034] The head height adjustment electric cylinder assembly includes at least one head height adjustment electric cylinder, and a head height adjustment electric cylinder assembly protective sleeve 150 is provided on the outside of the head height adjustment electric cylinder assembly. The head height adjustment electric cylinder assembly protective sleeve 150 covers the outside of the head height adjustment electric cylinder assembly to effectively protect it. Its upper end is set on the head angle adjustment electric cylinder assembly support plate 140, and its lower end is set on the headrest base plate 160.

[0035] The back pillow structure 200 includes a back support air cushion 210, a shoulder height adjustment electric cylinder assembly, and a shoulder pillow base plate 240. The back support air cushion 210 is used to effectively support the back 430 of the patient 400 undergoing rigid bronchoscopy. A back air cushion base plate 220 is provided on the lower side of the back support air cushion 210.

[0036] The shoulder height adjustment electric cylinder assembly allows medical staff to adjust the shoulder 430 of a patient 400 undergoing rigid bronchoscopy to the required height. The shoulder height adjustment electric cylinder assembly is connected to the controller, and its output shaft is connected to the back air cushion base plate 220.

[0037] The shoulder pillow base plate 240 is placed in the middle of the operating table by medical staff when performing rigid bronchoscopy on patients, and the lower end of the shoulder height adjustment electric cylinder assembly is set on the shoulder pillow base plate 240.

[0038] The shoulder height adjustment electric cylinder assembly includes at least one shoulder height adjustment electric cylinder, and a shoulder height adjustment electric cylinder assembly protective sleeve 230 is provided on the outside of the shoulder height adjustment electric cylinder assembly. The shoulder height adjustment electric cylinder assembly protective sleeve 230 covers the outside of the shoulder height adjustment electric cylinder assembly to effectively protect it. Its upper end is set on the back air cushion base plate 220 and its lower end is set on the shoulder pillow base plate 240.

[0039] A thoracic spine support pillow 250 is provided on the shoulder pillow base plate 240 and at the position of the patient's thoracic vertebra 440. The thoracic spine support pillow 250 can effectively support and protect the patient's thoracic vertebra 440 and avoid damage to the patient's thoracic vertebra.

[0040] The neck pillow structure 300 includes a neck support air cushion 310, a neck height adjustment electric cylinder assembly, and a neck pillow base plate 340. The neck support air cushion 310 is used to effectively support the neck 420 of a patient 400 undergoing rigid bronchoscopy. A neck air cushion base plate 320 is provided on the underside of the neck support air cushion 310.

[0041] The neck height adjustment electric cylinder assembly allows medical staff to effectively adjust the height of the neck support air cushion and ensure that the neck support air cushion effectively supports the neck of patients undergoing rigid bronchoscopy. The neck height adjustment electric cylinder assembly is connected to the controller, and its output shaft is connected to the neck air cushion base plate 320.

[0042] The neck pillow base plate 340 is placed on the operating table by medical staff during rigid bronchoscopy and is located between the head pillow base plate 160 and the shoulder pillow base plate 240. The lower end of the neck height adjustment electric cylinder assembly is set on the neck pillow base plate 340.

[0043] The neck height adjustment electric cylinder assembly includes at least one neck height adjustment electric cylinder, and a neck height adjustment electric cylinder assembly protective sleeve 330 is provided on the outside of the neck height adjustment electric cylinder assembly. The neck height adjustment electric cylinder assembly protective sleeve 330 covers the outside of the neck height adjustment electric cylinder assembly to effectively protect it. Its upper end is set on the neck air cushion base plate 320 and its lower end is set on the shoulder and neck pillow base plate 340.

[0044] A first dovetail slide foot 341 is provided on the side of the neck pillow substrate 340 near the head pillow substrate 160. A first dovetail groove that cooperates with the first dovetail slide foot is provided on the side of the head pillow substrate 160 near the neck pillow substrate 340. The first dovetail slide foot 341 can slide along the first dovetail groove to adjust the distance between the neck pillow substrate and the head pillow substrate.

[0045] A first positioning screw 170 is provided on one side of the headrest base plate 160. When the first dovetail slide foot slides along the first dovetail slide groove to the required position, it locks and positions itself. A first threaded hole is provided on one side of the headrest base plate to cooperate with the first positioning screw 170. The first positioning screw 170 passes through the first threaded hole and is pressed against one side of the first dovetail slide foot.

[0046] A second dovetail slide foot 342 is provided on the side of the neck pillow base plate 340 near the shoulder pillow base plate. A second dovetail groove is provided on the side of the shoulder pillow base plate near the neck pillow base plate to cooperate with the second dovetail slide foot. The second dovetail slide foot can slide along the second dovetail groove to adjust the distance between the neck pillow base plate and the shoulder pillow base plate.

[0047] A second positioning screw 260 is provided on one side of the shoulder pillow base plate 240. When the second dovetail slide foot slides along the second dovetail slide groove to the required position, it locks and positions itself. A second threaded hole that cooperates with the second positioning screw is provided on one side of the shoulder pillow base plate. The second positioning screw passes through the second threaded hole and is pressed against one side of the second dovetail slide foot.

[0048] In summary, this invention features a reasonable overall design, simple structure, and convenient operation. It effectively combines a headrest, backrest, and neck pillow structure. When performing rigid bronchoscopy, medical staff simply place this structure on the operating table, place the patient supine on top of it, and then use this structure to adjust the patient's head, neck, and cervical spine to the required height and angle. This method not only reduces the workload of medical staff but also lowers the risks of related surgeries and improves the success rate, greatly facilitating the positioning and care of patients undergoing rigid bronchoscopy.

[0049] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A support and auxiliary device for use in rigid bronchoscopy, characterized in that, include A headrest structure is placed under the patient's head during a rigid bronchoscopy procedure performed by a medical staff member. The headrest structure is located at the head of the operating table where the medical staff performs the rigid bronchoscopy procedure. A back support structure is placed under the patient's back during a rigid bronchoscopy procedure performed by a medical staff member. The back support structure is located in the middle of the operating table on which the medical staff perform the rigid bronchoscopy procedure. A neck pillow structure is placed under the patient's neck during a rigid bronchoscopy procedure performed by a medical staff member. The neck pillow structure is set on the operating table where the medical staff performs the rigid bronchoscopy procedure and is located between the head pillow structure and the back pillow structure. One end of the neck pillow structure is detachably connected to the head pillow structure and the other end is detachably connected to the back pillow structure. A controller is used to adjust the height and angle of the headrest structure, backrest structure, and neck pillow structure to adjust the patient to the position required by medical staff. The controller is communicatively connected to the headrest structure, backrest structure, and neck pillow structure respectively.

2. The support and assistance device for use in rigid bronchoscopy as described in claim 1, characterized in that: The headrest structure includes An annular air cushion for effectively fixing the head of a patient undergoing rigid bronchoscopy, with an annular base plate on the underside of the annular air cushion. A medical professional uses a head angle adjustment cylinder assembly that can adjust the head of a patient undergoing rigid bronchoscopy to the required angle. The head angle adjustment cylinder assembly is communicatively connected to a controller, and its output shaft is connected to an annular base plate. A head angle adjusting electric cylinder assembly support plate for effectively supporting the head angle adjusting electric cylinder assembly, wherein the lower end of the head angle adjusting electric cylinder assembly is disposed on the head angle adjusting electric cylinder assembly support plate. A medical professional can use a head height adjustment cylinder assembly to adjust the head of a patient undergoing rigid bronchoscopy to the required height. The head height adjustment cylinder assembly is communicatively connected to a controller, and its output shaft is connected to the head angle adjustment cylinder assembly support plate. A headrest base plate placed at the head of the operating table by a medical staff member during a rigid bronchoscopy procedure. The lower end of the head height adjustment electric cylinder assembly is located on the headrest base plate.

3. The support and assistance device for use in rigid bronchoscopy as described in claim 1, characterized in that: The backrest structure includes A back support air cushion for effectively supporting the back of a patient undergoing rigid bronchoscopy, wherein a back support air cushion base plate is provided on the underside of the back support air cushion. A medical professional can use a shoulder height adjustment cylinder assembly to adjust the shoulder of a patient undergoing rigid bronchoscopy to the required height. The shoulder height adjustment cylinder assembly is connected to a controller, and its output shaft is connected to the back air cushion base plate. A shoulder pillow base plate is placed in the middle of the operating table by a medical staff member during a rigid bronchoscopy procedure on a patient. The lower end of the shoulder height adjustment electric cylinder assembly is set on the shoulder pillow base plate.

4. The support and auxiliary device for use in rigid bronchoscopy as described in claim 3, characterized in that: A thoracic spine auxiliary pillow is provided on the shoulder pillow base plate and at the position of the patient's thoracic spine, which can effectively support and protect the patient's thoracic spine.

5. The support and auxiliary device for use in rigid bronchoscopy as described in claim 4, characterized in that: The neck pillow structure includes A neck support air cushion for effectively supporting the neck of a patient undergoing rigid bronchoscopy, wherein a neck support air cushion base plate is provided on the lower side of the neck support air cushion. A medical professional can use a neck height adjustment electric cylinder assembly to effectively adjust the height of the neck support air cushion and enable the neck support air cushion to effectively support the neck of a patient undergoing rigid bronchoscopy. The neck height adjustment electric cylinder assembly is communicatively connected to a controller, and its output shaft is connected to the base plate of the neck air cushion. A neck pillow base is placed on the operating table between the head pillow base and the shoulder pillow base during a rigid bronchoscopy procedure performed by a medical staff member. The lower end of the neck height adjustment electric cylinder assembly is located on the neck pillow base.

6. The support and assistance device for use in rigid bronchoscopy as described in claim 5, characterized in that: A first dovetail slide foot is provided on the side of the neck pillow base plate near the head pillow base plate, and a first dovetail groove is provided on the side of the head pillow base plate near the neck pillow base plate to cooperate with the first dovetail slide foot. The first dovetail slide foot can slide along the first dovetail groove to adjust the distance between the neck pillow base plate and the head pillow base plate.

7. The support and auxiliary device for use in rigid bronchoscopy as described in claim 6, characterized in that: A first positioning screw is provided on one side of the headrest base plate. When the first dovetail slide foot slides along the first dovetail groove to the required position, it locks and positions itself. A first threaded hole is provided on one side of the headrest base plate to cooperate with the first positioning screw. The first positioning screw passes through the first threaded hole and presses against one side of the first dovetail slide foot.

8. The support and auxiliary device for use in rigid bronchoscopy as described in claim 7, characterized in that: A second dovetail slide is provided on the side of the neck pillow base plate near the shoulder pillow base plate, and a second dovetail groove is provided on the side of the shoulder pillow base plate near the neck pillow base plate to cooperate with the second dovetail slide. The second dovetail slide can slide along the second dovetail groove to adjust the distance between the neck pillow base plate and the shoulder pillow base plate.

9. The support and auxiliary device for use in rigid bronchoscopy as described in claim 8, characterized in that: A second positioning screw is provided on one side of the shoulder pillow base plate. When the second dovetail slide foot slides along the second dovetail slide groove to the required position, it locks and positions itself. A second threaded hole is provided on one side of the shoulder pillow base plate to cooperate with the second positioning screw. The second positioning screw passes through the second threaded hole and presses against one side of the second dovetail slide foot.

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