Wound space angle measuring tool and measuring method

Abstract

The invention belongs to the field of criminal investigation measurement, and particularly relates to a wound space angle measuring tool and method. Comprising a probe and three reference surfaces which are movably connected with the probe and are perpendicular to one another, and the reference surfaces can rotate around the probe; the angle between the reference surface and the probe is variable; a spherical hole seat is arranged at the intersection of the reference surfaces, and a spherical joint in matched connection with the spherical hole seat is arranged on the probe; and the measuring scale is used for measuring the distance between the vertex of the reference surface and the tail end of the probe. After the distance is measured, the space angle can be obtained according to the cosine law.

Description

Technical Field

[0001] This application belongs to the field of criminal investigation measurement, specifically involving a tool and method for measuring spatial angles. Background Technology

[0002] The basic anatomical planes of the human body are a term in human anatomy, referring to the three mutually perpendicular anatomical planes formed by the sagittal plane, the coronal plane, and the horizontal plane.

[0003] The spatial angle measurement of the wound refers to the angle formed by the puncture wound on the body with the coronal, sagittal, and horizontal planes. The application of wound spatial angle data is reflected in the construction of a multi-dimensional chain of evidence. Its core significance lies in providing objective and quantitative evidence to ensure the scientific validity and legal effect of the identification conclusions.

[0004] The applicant previously proposed a measuring tool, including a probe and several mutually perpendicular reference surfaces movably connected to the probe. The reference surfaces can rotate around the probe; the angle between the reference surfaces and the probe is variable; an indicator needle parallel to the reference surface is set on the reference surface, and a scale is connected to the indicator needle. After measuring the distance between the scale and the probe, the spatial angle is obtained by the tangent function. Summary of the Invention

[0005] Technical problem: The technical problem to be solved by this application is to provide a measuring tool that can quickly measure the angle of the creation space, optimize the structure of the measuring tool, and improve the measurement method.

[0006] Technical Solution: To solve the above-mentioned technical problems, the technical solution proposed in this application is as follows:

[0007] A tool for measuring the angle of a space, characterized in that it includes a probe and three mutually perpendicular reference surfaces movably connected to the probe;

[0008] The reference surface can rotate around the probe;

[0009] The angle between the reference plane and the probe is variable;

[0010] A spherical hole seat is provided at the intersection of the reference surfaces, and a spherical segment is provided on the probe to mate with and connect to the spherical hole seat;

[0011] It also includes a measuring ruler, which is used to measure the distance between the vertex of the reference surface and a specific point on the probe, which can be selected as the end of the probe.

[0012] Furthermore, the spherical hole seat is provided with a hollow sphere with a through hole, and the central axis of the through hole has the same angle as the intersection line of any reference surface and / or the reference surface.

[0013] Furthermore, the central axis of the probe coincides with the center of the spherical segment.

[0014] Furthermore, the sphere of the spherical socket is located at point O. OAB, OBC, and OCA are three mutually perpendicular reference planes. OA, OB, and OC intersect at point O and are mutually perpendicular. Points A, B, and C are vertices. These points are defined to more clearly describe the measurement method described below.

[0015] A method for measuring the spatial angle of a tunnel, wherein the method uses the aforementioned spatial angle measuring tool, the tool having the following dimensions: OA=OB=OC=r, and the distance between point O and point P at the end of the probe is L;

[0016] The method includes the following steps;

[0017] S1: Insert the probe tip into the incision tract and fit the incision tract;

[0018] S2: Parallel any two reference planes to any two basic human body cross planes;

[0019] S3: Measure the lengths d1, d2, and d3 of the three vertices A, B, and C and the probe tip P;

[0020] The spatial angle between S4:OL and the plane OBC is ,

[0021] but

[0022] (The basic calculation principle is the Law of Cosines, because...) (The angle is the complementary angle of ∠AOP, hence the above equation)

[0023] Similarly, calculate the angles between the planes and the other two reference planes.

[0024]

[0025] .

[0026] The beneficial effects of this application are as follows: By setting three mutually perpendicular reference surfaces that can rotate freely around the probe, during measurement, only two reference surfaces need to be aligned or parallel to any two basic sections of the human body (coronal, sagittal, and horizontal planes) to automatically align or parallel the third reference surface with the remaining basic sections. This overcomes the shortcomings of existing technologies where a single or double protractor cannot accurately fit with three basic sections of the human body simultaneously, achieving complete alignment in one go and greatly reducing operational difficulty and cumulative rotational errors. Since r and L in the formula are factory-fixed values, the actual measurement only involves three distances d1, d2, and d3. Therefore, the entire measurement process can be completed within 30 seconds, making it particularly suitable for complex case scenes where corpses decompose rapidly or where multiple people need to examine the scene simultaneously, greatly improving the efficiency of forensic on-site identification.

[0027] This tool has a compact structure, few parts, no complex electronic components, low manufacturing cost, is easy to disinfect, and is corrosion resistant, fully meeting the strict environmental requirements of forensic sites and autopsy rooms. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the tool used in an embodiment of this application;

[0029] Figure 2 This is a schematic diagram of the geometric relationships involved in the measurement method of this application embodiment.

[0030] In the diagram: 1. Reference surface; 2. Spherical hole seat; 3. Probe; 4. Connecting rod; 5. Measuring ruler. Detailed Implementation

[0031] like Figure 1 As shown, a spatial angle measuring tool includes three mutually perpendicular reference surfaces 1, each composed of a right-angled isosceles triangle. A spherical socket 2 is positioned at the intersection of the reference surfaces 1. A probe 3 passes through the socket, and a spherical joint on the probe 3 engages with the spherical socket 2, allowing the spatial frame formed by the reference surfaces 1 to rotate in any direction. A connecting rod 4 is positioned at the apex of the spatial frame for connecting the front end of a measuring ruler 5.

[0032] Those skilled in the art can also measure the distance between the apex of the space frame and the end of probe 3 using other existing measurement methods.

[0033] The spatial tunneling measurement method based on this tool is as follows:

[0034] The sphere of the spherical hole seat 2 is located at point O. OAB, OBC, and OCA are three mutually perpendicular reference planes 1. OA, OB, and OC intersect at point O and are mutually perpendicular. Points A, B, and C are vertices. These points are defined to more clearly describe the measurement method described below.

[0035] This method uses the aforementioned tool for measuring the spatial angle of the tunnel. The tool's dimensions are: OA=OB=OC=r, and the distance between point O and point P at the end of probe 3 is L.

[0036] The method includes the following steps;

[0037] S1: Insert the tip of probe 3 into the incision tract and fit the incision tract;

[0038] S2: Parallel any two reference planes 1 to any two basic human body cross planes;

[0039] S3: Measure the lengths d1, d2, and d3 of the three vertices A, B, and C and the end point P of probe 3;

[0040] The spatial angle between S4:OL and the plane OBC is ,

[0041] but

[0042] (The basic calculation principle is the Law of Cosines, because...) (The angle is the complementary angle of ∠AOP, hence the above equation)

[0043] Similarly, calculate the angles β and γ between the plane and the other two reference planes 1.

[0044]

[0045] .

Claims

1. A tool for measuring spatial angles, characterized in that, It includes a probe (3) and three mutually perpendicular reference surfaces (1) that are movably connected to the probe (3). The reference surface (1) can rotate around the probe (3); The angle between the reference surface (1) and the probe (3) is variable; A spherical hole seat (2) is provided at the intersection of the reference surface (1), and a spherical segment is provided on the probe (3) to cooperate and connect with the spherical hole seat (2); It also includes a measuring ruler (5) for measuring the distance between the vertex of the reference surface (1) and a specific point on the probe (3).

2. The tool for measuring the spatial angle of a tunnel as described in claim 1, characterized in that, The spherical hole seat (2) is a hollow sphere with a through hole, and the central axis of the through hole has the same angle as the intersection line of the arbitrary reference surface (1) and / or the reference surface (1).

3. The tool for measuring the spatial angle of a tunnel as described in claim 2, characterized in that, The central axis of the probe (3) coincides with the center of the spherical segment.

4. The tool for measuring the spatial angle of a tunnel as described in claim 3, characterized in that, The spherical hole seat (2) is located at point O. OAB, OBC, and OCA are three mutually perpendicular reference planes (1). OA, OB, and OC intersect at point O and are mutually perpendicular. Points A, B, and C are the vertices.

5. A method for measuring the spatial angle of a tunnel, characterized in that, The method uses the spatial angle measuring tool of claim 4, the tool having the following dimensions: OA=OB=OC=r, and the distance between point O and point P at the end of probe (3) is L; The method includes the following steps; S1: Insert the tip of probe (3) into the incision tract and fit it with the incision tract; S2: Parallel any two reference planes (1) to any two basic human body sections; S3: Measure the lengths d1, d2, and d3 of the three vertices A, B, and C and the end point P of the probe (3); The spatial angle between S4:OL and the plane OBC is , but ; Similarly, calculate the angles between the plane and the other two reference planes (1).

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