A skin scale for surgery
By designing the scale strips and magnetic block structure of the skin ruler, the stability and image compatibility issues of surface marking tools during surgery were solved, achieving high-precision, low-cost intraoperative positioning and measurement, and simplifying the operation process.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 刘莘雨
- Filing Date
- 2025-04-17
- Publication Date
- 2026-06-26
AI Technical Summary
Existing surgical surface marking tools cannot provide a stable and durable reference benchmark due to wear and tear caused by disinfection, sweat, or intraoperative operations. They also lack image compatibility and are difficult to calibrate simultaneously during intraoperative fluoroscopy. Traditional ruler plates or electromagnetic navigation systems are costly and complex to operate, making them difficult to popularize.
A skin ruler was designed, which uses graduated strips and magnetic blocks to achieve dynamic adjustment of the spacing. Combined with metal wires and strap buckles, it ensures a close fit to curved body surfaces and is clearly visible in X-rays and CT scans. It provides a unified ruler reference and supports quick assembly and disassembly.
The imaging grid eliminates magnification distortion caused by differences in the distance of the radiation source, reduces measurement error to less than 10%, achieves an intraoperative displacement rate of less than 1.5 mm, shortens operation time by 40%, and costs only 5% of traditional navigation equipment.
Smart Images
Figure CN224403782U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of medical devices, and specifically relates to a skin ruler used in surgery. Background Technology
[0002] In orthopedic and interventional oncology surgeries, preoperative imaging measurements rely on digital scales from CT and X-ray equipment to assess tissue size and location. However, during surgery, changes in patient positioning, skin stretching, or differences in the distance to the radiation source often lead to image magnification distortion, resulting in significant deviations between the measured data and the actual anatomical structures. Existing surface markings often involve placing Kirschner wires or marking lines on the skin, which are easily dislodged due to disinfection, sweat, or wear and tear during surgical procedures. These methods fail to provide a stable and durable reference benchmark and lack image compatibility, making simultaneous imaging and calibration during intraoperative fluoroscopy difficult.
[0003] Furthermore, some solutions rely on rigid rulers or electromagnetic navigation systems. The former is prone to displacement because it cannot conform to curved surfaces, while the latter, although highly accurate, is expensive, complex to operate, and requires additional calibration steps, limiting its adoption in primary healthcare institutions. Traditional adjustable clamps (such as bolt-fixed rulers) are cumbersome to adjust, pose a risk of skin compression, and lack imaging structures compatible with multimodal imaging equipment, making it difficult to meet the needs of real-time intraoperative positioning. Summary of the Invention
[0004] In view of the technical problems existing in the background art, the present invention provides a skin ruler for surgery, which uses scale strips and magnetic blocks to achieve dynamic adjustment of the spacing. It can not only fit the curved surface of the body stably and fix it, but also be clearly visualized in X-ray and CT, providing a unified ruler benchmark for preoperative planning. At the same time, it can be quickly assembled and disassembled through snaps to avoid intraoperative interference, significantly improving the accuracy of puncture positioning and incision design and the efficiency of operation.
[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:
[0006] A skin ruler for surgery includes a horizontal ruler plate and a vertical ruler plate. The ends of the horizontal and vertical ruler plates are vertically connected by a connecting block. The other side of the connecting block is detachably connected to a strap. The end of the strap is provided with a buckle. Metal wires are provided between the horizontal and vertical ruler plates. The metal wires are parallel to each other and the spacing is adjustable.
[0007] In a preferred embodiment, the metal wire includes a transverse metal wire and a longitudinal metal wire, wherein the transverse metal wire is arranged parallel to the transverse ruler and the longitudinal metal wire is arranged parallel to the longitudinal ruler.
[0008] In a preferred embodiment, the horizontal ruler is engraved with horizontal scale bars, and the vertical ruler is engraved with vertical scale bars.
[0009] In a preferred embodiment, a thin screw is vertically connected between the connecting blocks, a fixed cylinder is sleeved on the thin screw, the two sides of the fixed cylinder are rotatably connected to the adjusting cylinder, the adjusting cylinder is sleeved on the thin screw and threadedly connected to the thin screw, and a longitudinal metal wire is vertically connected between the fixed cylinders.
[0010] In a preferred embodiment, magnetic blocks are slidably disposed on the longitudinal ruler plate, and transverse metal wires are vertically connected between the magnetic blocks.
[0011] In a preferred embodiment, the end of the strap is provided with a connector, the side of the connector is provided with a retaining rail, and the connecting block is provided with a corresponding retaining groove. The connector is inserted into the retaining groove through the retaining rail.
[0012] In a preferred embodiment, the buckle includes a toothed groove and a card holder. The toothed groove is located at the end of one side of the strap, and the card holder is located at the end of the other side of the strap. The toothed groove on the strap passes through the card holder and locks the strap in place.
[0013] A skin ruler for surgical use, this patented technology can achieve the following beneficial effects in practical use:
[0014] 1. The mesh composed of metal wires is clearly visible in X-ray, CT and other images, directly providing a scale reference synchronized with the anatomical structure. Through the parallel distribution of horizontal and vertical metal wires, the magnification distortion caused by the difference in the distance of the radiation source is eliminated, and the intraoperative measurement error can be reduced to less than 10%.
[0015] 2. Based on the sliding adjustment of the magnetic block and the thread fine adjustment mechanism of the fine screw, the spacing of the metal wires can be adjusted as needed to conform to the curvature of the skin and adapt to changes in body position during surgery; the bandage adopts a combination design of elastic material and rigid connector, which takes into account both the elastic fixation of the limbs and the rigid locking of the trunk, with an intraoperative displacement rate of less than 1.5mm.
[0016] 3. The toothed grooves and quick-locking structure of the buckle and the card box support single-handed operation and disassembly during surgery, avoiding the complicated adjustment steps of traditional clamps; the metal wires and straps are made of medical-grade polymer and stainless steel materials, with a unit cost of less than 5% of traditional navigation equipment, and can be repeatedly sterilized and reused.
[0017] 4. The horizontal and vertical scale bars provide visual coarse adjustment, which, combined with the imaging grid, allows for fine-tuning of the image. This can simultaneously meet diverse needs such as orthopedic osteotomy angle calibration, tumor puncture path planning, and flap transplantation size matching, reducing the average intraoperative operation time by 40%. Attached Figure Description
[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments:
[0019] Figure 1This is a schematic diagram of the overall structure of this utility model;
[0020] Figure 2 This is an enlarged schematic diagram of the horizontal and vertical ruler structures of this utility model;
[0021] Figure 3 This is an enlarged schematic diagram of the buckle structure of this utility model;
[0022] Figure 4 This is a schematic diagram of the connection structure between the strap and the connecting block of this utility model.
[0023] In the diagram: 1. Horizontal ruler plate; 2. Vertical ruler plate; 3. Strap; 4. Buckle; 41. Gear groove; 42. Card box; 5. Metal wire; 51. Horizontal metal wire; 52. Vertical metal wire; 6. Horizontal scale bar; 7. Connecting block; 8. Fine screw; 9. Vertical scale bar; 10. Magnetic block; 11. Fixing cylinder; 12. Adjusting cylinder; 13. Connecting head; 14. Card rail; 15. Card groove. Detailed Implementation
[0024] like Figure 1 As shown, a skin ruler for surgery includes a horizontal ruler 1 and a vertical ruler 2. The horizontal ruler 1 and vertical ruler 2 are made of medical-grade polycarbonate material, with a thickness of 3-5 mm, a width of 15-20 mm, and a length that can be set to 200-400 mm depending on the surgical site. The ends of the horizontal ruler 1 and vertical ruler 2 are vertically connected by a connecting block 7, which is made of stainless steel and has a 90° positioning groove inside to ensure precise perpendicularity between the two rulers. The other side of the connecting block 7 is detachably connected to a strap 3, which is made of medical-grade silicone, has a width of 25 mm, and possesses good elasticity and biocompatibility. A buckle 4 is provided at the end of the strap 3. A metal wire 5, made of 0.5 mm diameter medical-grade stainless steel wire, is positioned between the horizontal ruler 1 and vertical ruler 2. The metal wires 5 are parallel to each other, and their spacing can be adjusted within the range of 5-50 mm via an adjustment mechanism.
[0025] Preferred solutions include Figure 2 As shown, the metal wire 5 includes a transverse metal wire 51 and a longitudinal metal wire 52. The transverse metal wire 51 is arranged parallel to the transverse ruler 1, and the spacing corresponds to the graduation value of the transverse scale bar 6. The longitudinal metal wire 52 is arranged parallel to the longitudinal ruler 2, and the spacing matches the graduation value of the longitudinal scale bar 9. The surface of the metal wire is matte-finished to reduce reflective interference.
[0026] Preferred solutions include Figure 2 As shown, the horizontal ruler plate 1 is engraved with horizontal scale bars 6, with a scale accuracy of 1mm and numerical markings every 5mm; the vertical ruler plate 2 is engraved with vertical scale bars 9, with the scale design consistent with the horizontal scale bars 6. The scales are engraved using laser engraving technology to ensure that they will not fade over long-term use.
[0027] Preferred solutions include Figure 2 As shown, thin screws 8 are vertically connected between the connecting blocks 7. The thin screws 8 are M3 specification stainless steel threaded rods, with a length matching the ruler plate. A fixing cylinder 11, made of aluminum alloy, is fitted onto the thin screw 8 with a clearance fit to its inner diameter. The two sides of the fixing cylinder 11 are rotatably connected to adjusting cylinders 12, the outer surface of which has anti-slip textures. The adjusting cylinder 12 is fitted onto the thin screw 8 and threadedly connected to it. Each rotation allows the longitudinal metal wire 52 to move 2mm. The longitudinal metal wire 52 is vertically connected between the fixing cylinders 11, and the connection is secured using micro-welding.
[0028] Preferred solutions include Figure 2 As shown, magnetic blocks 10 are slidably mounted on the longitudinal ruler plate 2. Each magnetic block 10 contains a neodymium magnet and can be fixed at any position on the ruler plate surface. Horizontal metal wires 51 are vertically connected between the magnetic blocks 10. The spacing between the magnetic blocks 10 is adjusted in 5mm increments to meet different measurement needs.
[0029] Preferred solutions include Figure 4 As shown, the end of the strap 3 is provided with a connector 13, which is made of ABS engineering plastic. A retaining rail 14 is provided on the side of the connector 13, and the retaining rail 14 has a dovetail groove structure. A corresponding retaining groove 15 is provided on the connecting block 7, and an elastic retaining tongue is provided within the retaining groove 15. The connector 13 is inserted into the retaining groove 15 via the retaining rail 14, and after insertion, it can be further secured by a rotating lock.
[0030] Preferred solutions include Figure 3 As shown, the buckle 4 includes a toothed groove 41 and a locking box 42. The toothed groove 41 is located at the end of one side of the strap 3, with a tooth pitch of 2mm. The locking box 42 is located at the end of the other side of the strap 3 and has spring steel teeth inside. After the toothed groove 41 on the strap 3 passes through the locking box 42, the teeth automatically engage and lock, and can withstand a maximum tensile force of 10kg. A release button is provided on the side of the locking box 42 for easy and quick disassembly. Since the structure and connection method of the toothed groove 41 and the locking box 42 are similar to the connection method of the strap, which is prior art, they are not described in detail in this case.
[0031] The above embodiments are merely preferred technical solutions of this utility model and should not be considered as limitations on this utility model. The protection scope of this utility model should be the technical solution described in the claims, including equivalent substitutions of the technical features described in the claims. That is, equivalent substitutions and improvements within this scope are also within the protection scope of this utility model.
Claims
1. A skin ruler for surgery, comprising a transverse ruler plate (1) and a longitudinal ruler plate (2), characterized in that: The ends of the horizontal ruler (1) and the vertical ruler (2) are vertically connected by a connecting block (7). The other side of the connecting block (7) is detachably connected to the strap (3). The end of the strap (3) is provided with a buckle (4). A metal wire (5) is provided between the horizontal ruler (1) and the vertical ruler (2). The metal wires (5) are parallel to each other and the spacing is adjustable.
2. The skin scale for surgery according to claim 1, characterized in that: The metal wire (5) includes a transverse metal wire (51) and a longitudinal metal wire (52). The transverse metal wire (51) is arranged parallel to the transverse ruler (1), and the longitudinal metal wire (52) is arranged parallel to the longitudinal ruler (2).
3. The skin scale for surgery according to claim 2, characterized in that: The horizontal ruler (1) is engraved with horizontal scale strips (6), and the vertical ruler (2) is engraved with vertical scale strips (9).
4. The skin scale for surgery according to claim 2, characterized in that: A thin screw (8) is vertically connected between the connecting blocks (7). A fixed cylinder (11) is sleeved on the thin screw (8). The two sides of the fixed cylinder (11) are rotatably connected to the adjusting cylinder (12). The adjusting cylinder (12) is sleeved on the thin screw (8) and threadedly connected to the thin screw (8). A longitudinal metal wire (52) is vertically connected between the fixed cylinders (11).
5. The skin scale for surgery according to claim 2, characterized in that: A magnetic block (10) is slidably disposed on the longitudinal ruler plate (2), and a transverse metal wire (51) is vertically connected between the magnetic blocks (10).
6. The skin scale for surgery according to claim 1, characterized in that: The end of the strap (3) is provided with a connector (13), the side of the connector (13) is provided with a retaining rail (14), and the connecting block (7) is provided with a corresponding retaining groove (15). The connector (13) is inserted into the retaining groove (15) through the retaining rail (14).
7. The skin scale for surgery according to claim 1, characterized in that: The buckle (4) includes a toothed groove (41) and a card box (42). The toothed groove (41) is opened at the end of one side of the strap (3), and the card box (42) is set at the end of the other side of the strap (3). The toothed groove (41) on the strap (3) passes through the card box (42) and is locked and fixed.