Drag hook assembly for general surgery breast surgery
By designing a hook assembly for general breast surgery, this assembly solves the problems of waste of manpower, space occupation and low operation efficiency in existing operations through the structure of sliding limits, lift limits and rotational sliding, realizing automatic pulling and fully exposing the surgical field of view, improving the accuracy and safety of the surgery.
Patent Information
- Application Number
- CN202510184803.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-19
- Publication Date
- 2025-05-30
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
In existing general breast surgery, simple hook pulling requires manual operation of the surgical assistant throughout the process, resulting in waste of manpower, space occupation, low operation efficiency, and some hook pulling components are complex in structure, which cannot fully expose the surgical field of view.
A general external breast surgical hook assembly is designed. Through a combined structure of the mounting seat, mounting bracket, mounting ring rod and hook seat, the sliding limit and lift limit are achieved, accurately reaching the upper part of the surgical area, and pulling the tissue around the incision from different angles through rotation and sliding.
The hook assembly can automatically replace human pulling, fully expose the surgical field of view, improve the accuracy and safety of the surgery, reduce manpower waste and space occupation, and improve surgical efficiency.
Smart Images
Figure CN120052980A_ABST
Abstract
Description
Technical Field
[0001] The present invention belongs to the technical field of medical devices, and particularly relates to a general surgical breast operation retractor assembly. Background Art
[0002] General surgical breast operations are surgical treatment means for breast diseases such as breast tumors and breast benign nodules. The operations are usually carried out under general anesthesia or local anesthesia. Depending on the condition, different surgical methods can be selected, such as simple mass resection, breast segmental resection, simple mastectomy or breast-conserving tumor surgery, etc. Simple mass resection is applicable to benign lesions, while breast-conserving surgery aims to remove the tumor while basically retaining the breast shape and is suitable for patients with early breast cancer. During the operation, doctors will use advanced medical equipment and technologies to ensure the accuracy and safety of the operation. After the operation, patients need to follow the doctor's advice for recovery, including regular follow-up, wound care and necessary postoperative adjuvant treatment to reduce the recurrence risk and improve the quality of life. The operation is one of the effective methods for treating breast diseases and relieves the pain of patients.
[0003] In general surgical breast operations, retractors are usually needed. As an important surgical instrument, retractors play a crucial role. The main function of the retractor is to expose the surgical field of view, helping doctors better observe and operate on the surgical area during the operation. By pulling and fixing the surrounding tissues, it ensures that the surgical area is clearly visible, thereby improving the accuracy and safety of the operation.
[0004] Existing simple retractors are usually directly manually used by surgical assistants to complete the pulling of the incision tissues, and the assistants need to hold and operate throughout the process. The above operations usually have the following technical problems: 1. It wastes manpower, and due to the use of manpower, it squeezes the space in the operating room, causing space congestion and affecting the smooth progress of the operation; 2. The efficiency cannot be sustained after long-term manual operation. Due to slackness, the pulling is not in place, and repeated pulling is required; 3. Some retractor assemblies have complex structures and large volumes. While occupying space, they cannot fully expose the surgical field of view, affecting the normal progress of the operation and the normal use of other surgical instruments.
[0005] Therefore, it is necessary to provide a general surgical breast operation retractor assembly that can replace manual pulling with a mechanical structure, fully expose the surgical field of view, and make the breast operation smoother. Summary of the Invention
[0006] In order to solve the above technical problems, the present invention provides a general surgical breast operation retractor assembly. The retractor assembly is designed in terms of a structure for conveniently adjusting the position to accurately reach above the incision and a structure for horizontally pulling and vertically lifting the tissues around the incision at various angles. It can accurately reach above the surgical area through sliding limit and lifting limit; and through rotation and sliding, pull the tissues around the incision from different angles; To achieve the above technical objectives, the present invention is realized through the following technical solutions: A general surgery breast surgery retractor assembly, comprising: a mounting base, a mounting bracket, a mounting ring rod, a retractor, and a retractor seat; The mounting base is an inverted U-shaped plate member, with two pressing plates and two springs slidably mounted on both sides of the bottom; when the two pressing plates move away from each other, they respectively compress the two springs; on both sides above the mounting base, there are two parallel support rods slidably mounted with their tops at the same height; the top of one support rod is rotatably connected to a mounting bracket with an annular structure; the mounting bracket is a rectangular rod-shaped structure, and the other end is covered and connected to the top of the other support rod; The mounting ring rod is slidably mounted on the mounting bracket and is located within the annular structure of the mounting bracket; the retractor seat slides on the mounting ring rod; a retractor is slidably mounted within the retractor seat; The retractor is a hook-shaped structure that bends outward from the mounting ring rod; Furthermore, the middle part of the mounting base is a bottom plate, and two parallel slide rails are fixedly connected to two symmetric sides of the bottom plate; on both sides of the bottom plate, there are side plates extending vertically downward, and the two side plates and the bottom plate form an inverted U-shaped structure; Furthermore, on the opposite sides of the two clamping plates, there are pull rods fixedly connected; the two pull rods are perpendicular to the pressing plates and respectively pass through the two side plates; the two springs are respectively sleeved on the two pull rods and are both between the side plates and the two pressing plates; Furthermore, on the opposite side walls of the two slide rails, there are a number of pin holes penetrating from the inside to the outside; the number of pin holes is linearly arranged at intervals along the track direction of the slide rails; the bottom ends of the two support rods are fixedly connected with sliders adapted to the slide rails; on the sliders, there are spring pins adapted to the pin holes; Furthermore, on the two symmetric sides of the mounting ring rod, there are respectively fixedly connected with sliding sleeves A; the two sliding sleeves A are respectively slidably sleeved on both sides of the mounting bracket and are limited by fastening nuts or pins after sliding; Furthermore, the retractor seat includes a retractor seat A and a retractor seat B; the retractor seat A is a sleeve structure adapted to the mounting ring rod, and a fastening nut is screwed and installed on the inner side wall located within the mounting ring rod, and the retractor seat A is limited by screwing the fastening nut after sliding within the mounting ring rod; on the outer side wall of the retractor seat A located outside the mounting ring rod, there is a spring limit pin A that moves up and down in the vertical direction; Further, a sliding sleeve B is fixedly connected to the bottom of the hook seat A, and a hook rod A is slidably inserted into the sliding sleeve B; both ends of the hook rod A are respectively located inside and outside the mounting ring rod; a plurality of horizontally linearly arranged limiting holes A are formed in the hook rod A; after the hook rod A horizontally slides in the sliding sleeve B, it is limited by inserting a spring limit pin A into the limiting hole A; Further, the hook seat B is a sleeve structure adapted to the mounting ring rod, and a fastening nut is screwed and installed on a side wall located inside the mounting ring rod. After the hook seat B slides in the mounting ring rod, it is limited by screwing the fastening nut; a sliding sleeve C is fixedly connected to a side wall of the hook seat B located outside the mounting ring rod, and a hook rod B that moves up and down in the vertical direction is slidably inserted into the sliding sleeve C; a spring limit pin B that expands and contracts along the radial direction of the mounting ring rod in the horizontal direction is installed on the outer side of the sliding sleeve C away from the mounting ring rod; a plurality of vertically linearly arranged limiting holes B are formed in the hook rod B; after the hook rod B vertically slides in the sliding sleeve C, it is limited by inserting the spring limit pin B into the limiting hole B; Further, pulling handles are respectively fixedly connected to the ends of the hook rod A extending out of the mounting ring rod and the top end of the hook rod B; hooks are respectively sleeved and installed at the ends of the hook rod A extending into the mounting ring rod and the bottom end of the hook rod B; Further, the hook includes a bent plate hook with a bent plate structure, a fixed V-shaped hook with a fixed angle, and a movable V-shaped hook with a spring connected in the middle; one ends of the bent plate hook, the fixed V-shaped hook, and the movable V-shaped hook close to the outside of the mounting ring rod are all fixedly connected with mounting sleeves; the mounting sleeves are sleeved and installed at the ends of the hook rod A and the hook B away from the pulling handle; Further, angle scales are provided on the mounting ring rod, and the angle scales are arranged in a circular pattern along the circumferential direction of the mounting ring rod; the angle scales indicate the angular position of the hook seat on the mounting ring rod; dimension scales are provided on the upper surfaces of both sides of the mounting bracket, and the dimension scales are linearly arranged along the sliding direction of the sliding sleeve A, and the dimension scales indicate the horizontal position of the sliding sleeve A on the mounting bracket; The beneficial effects of the present invention are: A general surgical breast surgery retractor assembly provided by the present invention, compared with a traditional simple surgical retractor, is an operation in which a surgical assistant uses a retractor to manually pull the internal tissues of the breast; it can be stably fixed on the operating table through the mounting seat without affecting the lying position of the patient during breast surgery; by sliding and telescoping the support rod, the mounting bracket equipped with the mounting ring rod can be adjusted above the patient's breast; The installation ring rod can be accurately moved directly above the patient's surgical breast through sliding, facilitating the retraction operation during surgeries on different mammary glands; both the hook seat A and the hook seat B are structures that slide on the installation ring rod, enabling flexible adjustment of the position of the hooks on the installation ring rod; the mammary gland can be retracted from different angles; The hook rod of the present invention is provided with a form that slides and is limited in the horizontal direction and a structure that moves up and down and is limited in the vertical direction, which can meet the requirements of retracting the mammary gland tissue in the horizontal direction and lifting it in the vertical direction during mammary gland surgery. BRIEF DESCRIPTION OF THE DRAWINGS
[0007] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for describing the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.
[0008] Figure 1 is a schematic diagram of the overall structure from a perspective of the present invention; Figure 2 is the front view of the present invention; Figure 3 is the top view of the present invention; Figure 4 is a schematic diagram of the combined installation structure of the hook seat B and the curved plate hook of the present invention; Figure 5 is a schematic diagram of the structure of the installation ring rod of the present invention; Figure 6 is a schematic diagram of the combined installation structure of the hook seat A and the fixed V-shaped hook of the present invention; Figure 7 is a schematic diagram of the structure of the installation bracket in the flipped and opened state of the present invention; In the drawings, the list of components represented by each reference numeral is as follows: 1 - mounting base, 101 - bottom plate, 102 - side plate, 103 - pressing plate, 104 - spring, 105 - support rod, 106 - slide rail, 107 - pull rod, 2 - installation bracket, 201 - dimension scale, 3 - installation ring rod, 301 - sliding sleeve A, 302 - angle scale, 4 - hook seat A, 401 - spring limit pin A, 402 - sliding sleeve B, 403 - hook rod A, 404 - limit hole A, 405 - retraction handle, 5 - hook seat B, 501 - sliding sleeve C, 502 - spring limit pin B, 503 - limit hole B, 504 - hook rod B 6 - Retractor, 601 - Bent Plate Retractor, 602 - Fixed V - shaped Retractor, 603 - Movable V - shaped Retractor, 7 - Fastening Nut. Specific Embodiment
[0009] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention. Embodiment 1
[0010] Please refer to Figures 1-7 , in this embodiment, a retractor assembly for general surgery breast surgery includes: a mounting base 1, a mounting bracket 2, a mounting ring rod 3, a retractor 6, and a retractor seat; in this device, the mounting base 1 is a structure that stably fixes this device under the back opposite to the patient's breast on the bed when the patient lies down; the mounting bracket 2 is a structure for specifically mounting the mounting ring rod 3, providing a horizontal sliding track for the mounting ring rod 3; in this device, the retractor 6 mainly includes several common retractor forms, including a bent plate retractor 601, a fixed V - shaped retractor 602, and a movable V - shaped retractor 603. In the prior art, there are many mature technologies for the specific shapes of retractors. For those skilled in the art, when using the retractor seat and retractor rod of this device, merely changing the specific shape of the retractor can be achieved without creative activities; the mounting ring rod 3 is a structure for mounting the retractor seat of this device, and several retractor seats can all slide circumferentially on the mounting ring rod 3, that is, they can slide to different angular positions of the breast for traction; In this embodiment, the mounting base 1 is an inverted U - shaped plate member, and two pressing plates 103 and two springs 104 are slidably mounted on both sides of the bottom; when the two pressing plates 103 move away from each other, they respectively compress the two springs 104; two parallel and equally - high - topped lifting support rods 105 are slidably mounted on both sides above the mounting base 1; the top of one support rod 105 is rotatably connected to a ring - shaped mounting bracket 2; the mounting bracket 2 is a rectangular rod - shaped structure, and the other end is tightly connected after being covered and fastened to the top of the other support rod 105; the entire mounting bracket 2 is a structure that can be flipped relative to the mounting base 1, that is, it can be flipped upward to open and then flipped downward to be fastened after the patient lies down; it does not affect the patient's lying position; In this embodiment, the mounting ring rod 3 is slidably mounted on the mounting bracket 2 and is located within the annular structure of the mounting bracket 2; the hook seat slides on the mounting ring rod 3; a hook 6 is slidably mounted within the hook seat; the mounting ring rod 3 is a nearly circular annular structure, the mounting bracket 2 is a rectangular annular structure, and the mounting ring rod 3 linearly slides on two parallel rods of the mounting bracket 2; In this embodiment, the hook 6 is a hook-shaped structure that bends outward from the mounting ring rod 3; the hook 6 is a structure for direct pulling. Therefore, its final sliding direction is to pull towards the outside of the breast. Thus, the direction of the hook 6 is to bend outward from the mounting ring rod 3; In this embodiment, the middle part of the mounting base 1 is a bottom plate 101, and two parallel slide rails 106 are fixedly connected to two opposite sides of the bottom plate 101; side plates 102 extending vertically downward are fixed to both sides of the bottom plate 101, and the two side plates 102 and the bottom plate 101 form an inverted U-shaped structure; the two support rods 105 are parallel to each other and are located at symmetric positions of the mounting base 1. The way of limiting their positions after sliding is easy to think of by those skilled in the art, including spring pin limiting, pin limiting, nut fastening limiting, etc., and can be flexibly selected; In this embodiment, pull rods 107 are fixedly connected to the opposite sides of the two pressing plates 103; the two pull rods 107 are perpendicular to the pressing plates 103 and respectively pass through the two side plates 102; two springs 104 are respectively sleeved on the two pull rods 107 and are both between the side plates 102 and the two pressing plates 103; In this embodiment, a number of pin holes penetrating from the inside to the outside are formed on the mutually remote side walls of the two slide rails 106; the number of pin holes are linearly arranged at intervals along the track direction of the slide rails 106; the bottom ends of the two support rods 105 are fixedly connected with sliders adapted to the slide rails 106; spring pins adapted to the pin holes are installed on the sliders; In this embodiment, sliding sleeves A 301 are respectively fixedly connected to two opposite sides of the mounting ring rod 3; the two sliding sleeves A 301 are respectively slidably sleeved on both sides of the mounting bracket 2 and are limited by fastening nuts or pins after sliding; In this embodiment, the hook seat includes a hook seat A 4 and a hook seat B 5; the hook seat A 4 is a sleeve structure adapted to the mounting ring rod 3. A fastening nut is screwed and installed on the side wall on one side within the mounting ring rod 3, and the hook seat A 4 is limited by screwing the fastening nut after sliding within the mounting ring rod 3; a spring limit pin A 401 that moves up and down in the vertical direction is installed on the side wall of the hook seat A 4 outside the mounting ring rod 3; In this embodiment, a sliding sleeve B (402) is fixedly connected to the bottom of the hook seat A (4), and a hook rod A (403) is slidably inserted into the sliding sleeve B (402); both ends of the hook rod A (403) are located inside and outside the mounting ring rod (3); a number of horizontally linearly arranged limiting holes A (404) are formed in the hook rod A (403); after the hook rod A (403) horizontally slides in the sliding sleeve B (402), it is limited by inserting a spring limit pin A (401) into the limiting hole A (404). In this embodiment, the hook seat B (5) is a sleeve structure adapted to the mounting ring rod (3). A fastening nut is screwed and installed on the side wall located inside the mounting ring rod (3). After the hook seat B (5) slides in the mounting ring rod (3), it is limited by screwing the fastening nut; a sliding sleeve C (501) is fixedly connected to the side wall of the hook seat B (5) located outside the mounting ring rod (3), and a hook rod B (504) that moves up and down in the vertical direction is slidably inserted into the sliding sleeve C (501); a spring limit pin B (502) that expands and contracts along the radial direction of the mounting ring rod (3) in the horizontal direction is installed on the outer side of the sliding sleeve C (501) away from the mounting ring rod (3); a number of vertically linearly arranged limiting holes B (503) are formed in the hook rod B (504); after the hook rod B (504) vertically slides in the sliding sleeve C (501), it is limited by inserting the spring limit pin B (502) into the limiting hole B (503). In this embodiment, at the end of the hook rod A (403) extending out of the mounting ring rod (3) and the top end of the hook rod B (504), a pulling handle (405) is fixedly connected respectively; at the end of the hook rod A (403) extending into the mounting ring rod (3) and the bottom end of the hook rod B (504), a hook is sleeved and installed respectively. In this embodiment, the hook includes a bent plate hook (601) with a bent plate structure, a fixed V-shaped hook (602) with a fixed angle, and a movable V-shaped hook with a spring connected in the middle; at one end of the bent plate hook (601), the fixed V-shaped hook (602), and the movable V-shaped hook (602) close to the outside of the mounting ring rod (3), a mounting sleeve is fixedly connected; the mounting sleeve is sleeved and installed at the ends of the hook rod A (403) and the hook B away from the pulling handle (405). In this embodiment, angle scales (302) are provided on the mounting ring rod (3), and the angle scales (302) are arranged in a circular pattern along the circumferential direction of the mounting ring rod (3); the angle scales (302) indicate the angular position of the hook seat on the mounting ring rod (3); dimension scales (201) are provided on the upper surfaces of both sides of the mounting bracket (2), and the dimension scales (201) are linearly arranged along the sliding direction of the sliding sleeve A (301), and the dimension scales (201) indicate the horizontal position of the sliding sleeve A (301) on the mounting bracket (2). In this embodiment, the specific use process of a general surgical breast surgery retractor assembly is as follows: Assemble and install each component of this device according to the illustration and the above textual description. By pulling and releasing the pressing plate 103, fix this device stably on the operating table and move it to a suitable position. After flipping open the mounting bracket 2, the patient lies on the bottom plate 101, flip it closed and fasten the mounting bracket 2 with nuts; according to the height and position of the breast, slide and adjust the support rod 105 and position it, and at the same time control the telescoping of the support rod 105, slide the mounting ring rod 3 horizontally left and right to directly above the surgical breast, and observe and record through the size scale 201; select the hook seat A 4 or the hook seat B 5 according to the surgical needs, select the corresponding curved plate hook 601, the fixed V-shaped hook 602, the movable V-shaped hook 602, and rotate the hook seat A 4 or the hook seat B 5 to a suitable position on the mounting ring rod 3; at the same time, through the pulling handles 405 on the hook rod A 403 and the hook rod B 504, pull and adjust the position of the hook rod to complete the pulling of the breast tissue.
[0011] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific embodiments described. Obviously, many modifications and variations can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principle and practical application of the present invention, so that those skilled in the relevant technical field can understand and utilize the present invention well. The present invention is only limited by the claims and their full scope and equivalents.
Claims
1. A general breast surgery retractor assembly, characterized in that: include: Mounting seat, mounting bracket, mounting ring rod, retractor, retractor seat; The mounting seat is an inverted U-shaped plate, with two pressure plates and two springs slidably mounted on both sides of the bottom; when the two pressure plates move back and forth, they compress the two springs respectively; parallel support rods with the same top height are slidably mounted on both sides above the mounting seat; the top of one of the support rods is rotatably connected to a mounting bracket with an annular structure; the mounting bracket is a rectangular rod-shaped structure, and the other end is detachably connected to the top of another support rod; The installation arc rod is slidably mounted on the installation bracket and is located in the annular structure of the installation bracket; the hook seat slides on the installation ring rod; a hook is slidably mounted in the hook seat, and the hook is located in the installation arc rod; The pull hook is a hook-shaped structure that bends downwardly toward the outside of the mounting ring rod.
2. A general breast surgery retractor assembly according to claim 1, characterized in that: The middle part of the mounting seat is a bottom plate, and two parallel slide rails are fixedly connected on two symmetrical sides of the bottom plate; side plates extending vertically downward are fixed on both sides of the bottom plate, and the two side plates and the bottom plate form an inverted U-shaped structure.
3. A general breast surgery retractor assembly according to claim 1, characterized in that: A pull rod is fixedly connected to the side away from the two clamping plates; the two pull rods are perpendicular to the pressure plate and pass through the two side plates respectively; the two springs are respectively sleeved on the two pull rods and are between the side plates and the two pressure plates; the support rod is limited by a pin after sliding on the slide rail.
4. A general breast surgery retractor assembly according to claim 1, characterized in that: The two symmetrical sides of the mounting ring rod are respectively fixedly connected with sliding sleeves A; the two sliding sleeves are respectively slidably sleeved on the two sides of the mounting bracket, and are limited by tightening nuts or latches after sliding.
5. A general breast surgery retractor assembly according to claim 1, characterized in that: The hook seat includes a hook seat A and a hook seat B; the hook seat A is a sleeve structure that is compatible with the mounting ring rod, and a fastening nut is screwed and installed on a side wall inside the mounting ring rod. After the hook seat slides in the mounting ring rod, it is limited by screwing the fastening nut; the hook seat is located on the side wall outside the mounting ring rod and is equipped with a spring limit pin A that rises and falls in the vertical direction.
6. A general breast surgery retractor assembly according to claim 1, characterized in that: The bottom of the hook seat A is fixedly connected with a sliding sleeve B, and a hook rod A is slidably inserted in the sliding sleeve B; the two ends of the hook rod A are respectively located inside and outside the mounting ring rod; a plurality of horizontally linearly arranged limit holes A are opened on the hook rod A; after the hook rod A slides horizontally in the sliding sleeve B, the spring limit pin A is inserted into the limit hole A for limit.
7. A general breast surgery retractor assembly according to claim 1, characterized in that: The hook seat B is a sleeve structure that is compatible with the mounting ring rod, and a fastening nut is screwed and installed on one side wall inside the mounting ring rod. After the hook seat B slides in the mounting ring rod, it is limited by screwing the fastening nut; the hook seat B is fixedly connected to a sliding sleeve C on the side wall outside the mounting ring rod, and a hook rod B that can be lifted and lowered in the vertical direction is slidably inserted in the sliding sleeve C; a spring limit pin B that can be radially extended and retracted in the horizontal direction along the mounting ring rod is installed on the outer side of the sliding sleeve C away from the mounting ring rod; the hook rod B is provided with limit holes B that are arranged vertically linearly; after the hook rod B slides vertically in the sliding sleeve C, the spring limit pin B is inserted into the limit hole B to limit the position.
8. A general breast surgery retractor assembly according to claim 1, characterized in that: The end of the hook rod A extending out of the installation ring rod and the top of the hook rod B are respectively fixedly connected with a pulling handle; the end of the hook rod A extending into the installation ring rod and the bottom end of the hook rod B are respectively sleeved with a hook.
9. A general breast surgery retractor assembly according to claim 1, characterized in that: The hook includes a bent plate hook with a bent plate structure, a fixed V-shaped hook with a fixed angle, and a movable V-shaped hook connected with a spring in the middle; the bent plate hook, the fixed V-shaped hook, and the movable V-shaped hook are all fixedly connected with a mounting sleeve at one end close to the outside of the mounting ring rod; the mounting sleeve is sleeved and installed on the ends of the hook rod A and the hook B away from the pulling handle.
10. A general breast surgery retractor assembly according to claim 1, characterized in that: The mounting ring rod is provided with an angle scale, which is arranged in a circular shape along the circumferential direction of the mounting ring rod; the angle scale indicates the angular position of the hook seat on the mounting ring rod; the upper surfaces on both sides of the mounting bracket are provided with size scales, which are arranged linearly along the sliding direction of the sliding sleeve armor, and the size scale indicates the horizontal position of the sliding sleeve armor on the mounting bracket.