A spinal coronal balance ruler

Abstract

The application discloses a kind of spinal column coronal plane balance measuring scale, including dial, horizontal rod and vertical rod, the center of the dial is provided with a rotating shaft, rotating shaft is fixedly connected with dial, the vertical rod is sleeved on rotating shaft and clearance fit, vertical rod can rotate along rotating shaft 360 °, the dial is provided with a through hole, the horizontal rod passes through the through hole and clearance fit, dial can slide along horizontal rod transversely.The vertical rod of the application can rotate around rotating shaft, dial can be moved along horizontal rod horizontally with vertical rod, combined with C arm or X-ray perspective, the coronal plane balance of patient under prone position can be accurately measured and calculated, so as to accurately grasp the change situation of the coronal plane balance of patient before and after orthopedic.

Description

Technical Field

[0001] This invention belongs to the field of medical devices, specifically relating to a spinal coronal plane balance measuring ruler. Background Technology

[0002] Spinal deformities refer to abnormal changes in the structure or shape of the spine, causing its physiological curvature to deviate from the normal range. Externally, scoliosis can result in a prominent back deformity, such as a "razorback," often accompanied by imbalances in the coronal and sagittal planes and vertebral rotational deformities. It can also be accompanied by bilateral shoulder or pelvic imbalances, and unequal leg lengths. Patients with spinal deformities may also exhibit neurodevelopmental abnormalities such as meningocele and occult spina bifida. Severe spinal deformities can even impair neurological, respiratory, cardiac, and digestive functions.

[0003] In radiological assessment, the coronal plane balance of spinal deformities is primarily evaluated by assessing the relative relationship between the C7 plumb line and the sacral midline. The vertical distance between the C7 plumb line and the sacral midline on a full-length spinal X-ray is used to measure coronal plane balance; a value exceeding 2 cm indicates coronal plane imbalance. (The C7 plumb line is a straight line perpendicular to the horizontal line downwards from the midpoint of the C7 vertebral body; the sacral midline is a straight line perpendicular to the horizontal line upwards from the midpoint of the upper edge of the first sacral vertebra.) Assessing coronal plane balance during corrective surgery for spinal deformities remains challenging, primarily because full-length spinal X-rays are unavailable intraoperatively. Therefore, a coronal plane balance measurement scale is urgently needed to evaluate a patient's coronal plane balance. Summary of the Invention

[0004] The purpose of this invention is to provide a spinal coronal plane balance measuring ruler that enables accurate measurement, thereby solving the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a spinal coronal plane balance measuring ruler, comprising a scale, a horizontal rod, and a vertical rod. A rotating shaft is disposed at the center of the scale, and the rotating shaft is fixedly connected to the scale. The vertical rod is sleeved on the rotating shaft with a clearance fit, and the vertical rod can rotate 360° along the rotating shaft. The scale has a through hole, and the horizontal rod passes through the through hole with a clearance fit. The scale can slide laterally along the horizontal rod.

[0006] The beneficial effects of this invention are: The vertical rod of this invention can rotate around the rotation axis, and the scale can move horizontally along the horizontal rod, thereby driving the vertical rod to move horizontally. Combined with the X-ray of the lumbosacral region during surgery, the coronal plane balance of the patient in the prone position can be measured, thereby understanding the changes in the coronal plane balance of the patient's spine. Attached Figure Description

[0007] Figure 1 This is a schematic front view of the overall structure of the present invention; Figure 2 This is a schematic diagram of the overall structure of the present invention in use; Figure 3 for Figure 1 Left-view diagram; In the diagram: 1-Dial, 2-Horizontal rod, 3-Vertical rod, 4-Rotation axis, 5-Pointer. Detailed Implementation

[0008] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0009] like Figure 1-3 As shown, a spinal coronal plane balance measuring ruler includes a dial 1, a horizontal rod 2, and a vertical rod 3. A rotating shaft 4 is set at the center of the dial 1, and the rotating shaft 4 is fixedly connected to the dial 1. The vertical rod 3 is sleeved on the rotating shaft 4 with a clearance fit. The vertical rod 3 can rotate 360° along the rotating shaft 4. The dial 4 is provided with a through hole, and the horizontal rod 2 passes through the through hole with a clearance fit. The dial 4 can slide laterally along the horizontal rod 2.

[0010] A pointer 4 is provided on the front of the vertical rod 3 to facilitate accurate reading of the degree on the dial.

[0011] The dial 1 is made of transparent material, which is intended to minimize obstruction of the field of view and X-ray film, thereby improving measurement accuracy.

[0012] The dial 1 is made of medical polystyrene.

[0013] The horizontal bar 2 and the vertical bar 3 are made of stainless steel or titanium alloy. They are characterized by high temperature resistance, corrosion resistance, and high strength.

[0014] The rotating shaft 4 can be replaced with a locking screw. If the vertical rod 2 becomes loose during rotation, the locking screw can be tightened to fix the vertical rod. The tightness of the vertical rod can also be adjusted by the locking screw to facilitate its rotation.

[0015] The horizontal rod 2 has limit protrusions at both ends to prevent the dial 1 from sliding off during the sliding process along the horizontal rod 2.

[0016] The dial is accurate to 1°.

[0017] The working process of this invention: 1. The angle between the upper surface of the sacrum and the horizontal plane is measured on the patient's preoperative standing full-length spinal X-ray. 2. During the operation, the patient is in a prone position. Place this measuring ruler on the midline of the lumbosacral segment of the patient's back. The horizontal rod 2 should be as parallel as possible to the line connecting the highest points of the bilateral iliac bones (in reality, it is impossible to achieve absolute parallelism, but this will not affect subsequent operations and the final measurement results). At this time, take an X-ray of the lumbosacral segment in the prone position during the operation. The angle between the horizontal rod and the upper surface of the sacrum is the angle b. 3. Calculate the angle ab. When the patient's sacrum is lower on the left and higher on the right preoperatively: when ab is positive, rotate the horizontal rod 2 clockwise by the angle ab is; when ab is negative, rotate the horizontal rod 2 counterclockwise. When the patient's sacrum is higher on the left and lower on the right preoperatively, the rotation direction of the horizontal rod 2 is opposite to the above. (Because the horizontal rod 2 and the scale 4 are fixed on the rotation surface, rotating the horizontal rod 2 actually drives the scale 4 to rotate together. At this time, the vertical rod 3 is fixed, and the rotation angle of the horizontal rod 2 can be directly obtained by the degree of rotation of the scale 4 relative to the vertical rod 3). Finally, the horizontal rod 2 can be made parallel to the virtual horizontal plane. 4. Rotate the reset vertical rod 3 until it reaches the 0 mark on the dial 4. At this point, the vertical rod 3 is perpendicular to the horizontal rod 2, so it can be considered that the vertical rod 3 is perpendicular to the horizontal plane. 5. Move the vertical rod 3 parallel to the horizontal rod 2 until the end of the vertical rod 3 coincides with the surface mark of the midpoint of the sacrum. At this time, the vertical rod 3 is the perpendicular bisector of the sacrum. 6. The coronal plane deviation of the patient can be obtained by measuring the horizontal distance from the C7 spinous process (the C7 spinous process can be accurately touched on the body surface and can be used as the surface projection of the midpoint of the C7 vertebral body) to the end of the vertical rod 3.

[0018] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A spinal coronal plane balance measuring ruler, characterized in that: The device includes a dial (1), a horizontal rod (2), and a vertical rod (3). The dial (1) has a rotating shaft (4) at its center, which is fixedly connected to the dial (1). The vertical rod (3) is sleeved on the rotating shaft (4) with a clearance fit. The vertical rod (3) can rotate 360° along the rotating shaft (4). The dial (4) has a through hole, through which the horizontal rod (2) passes with a clearance fit. The dial (4) can slide laterally along the horizontal rod (2).

2. The spinal coronal plane balance measuring ruler according to claim 1, characterized in that: A pointer (4) is provided on the front of the vertical rod (3).

3. The spinal coronal plane balance measuring ruler according to claim 1, characterized in that: The dial (1) is made of transparent material.

4. The spinal coronal plane balance measuring ruler according to claim 1, characterized in that: The dial (1) is made of medical-grade polystyrene.

5. The spinal coronal plane balance measuring ruler according to claim 1, characterized in that: The horizontal bar (2) and the vertical bar (3) are made of stainless steel or titanium alloy.

6. The spinal coronal plane balance measuring ruler according to claim 1, characterized in that: The rotating shaft (4) can be replaced with a locking screw.

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