Torque sensing components for thromboelastometry

Abstract

The present invention relates to the technical field of medical equipment, and in particular to a torque sensing component suitable for a thrombelastograph, comprising: a U-shaped bracket and a rotating shaft, wherein the rotating shaft is vertically and rotatably arranged on the U-shaped bracket; a spring, wherein the spring is sleeved on the rotating shaft, one end of the spring is fixed on the rotating shaft, and the other end of the spring is fixed on the U-shaped bracket. The traditional suspension wire structure is replaced by arranging the rotating shaft and the spring, and the rotating shaft and the spring are easy to manufacture and have a simple structure, thereby overcoming the difficulties of difficulty in manufacturing torsion wires and production efficiency, so that the sensing device of the thrombelastograph can be manufactured quickly, with a high yield and low cost.

Description

Technical Field

[0001] The invention relates to the technical field of medical equipment, and in particular to a torque sensing component suitable for a thromboelastograph. Background Art

[0002] Thromboelastograph (TEG) is an analyzer that detects the coagulation process from the entire dynamic process. Thromboelastograph is widely used in clinical guidance of intraoperative transfusion and perioperative monitoring of coagulation function (a professional term for the treatment process of diseases that require surgical operations, including the entire period before, during and after surgery). It is also an important tool for blood product management in advanced countries in the world, and the device is used in transfusion guidelines. Thromboelastograph can perform dynamic analysis of processes such as coagulation factor activation, platelet aggregation, and fibrinolysis. The basic principle of thromboelastograph is: the motor drives the test cup carrying the blood sample to rotate at a certain angle (such as 4 degrees and 45 minutes) and period (such as 10 seconds). Once a thrombus is formed, the metal probe placed in the blood sample test cup is subjected to the shear stress of the sample, and then it rotates left and right. The rotation of the metal probe is sensed by a non-contact angle rotation sensor (such as an inductive angle sensor), converted into electrical power and handed over to the processor for processing, forming a coagulation curve. The metal probe is suspended on a torsion suspension wire. During the rotation of the metal probe, the torsion suspension wire needs to provide a progressive torsional resistance to resist the torque from the metal probe. The suspension wire plays a vital role in the thromboelastograph. Suspension wires with uneven torque, too large or too small torque constants cannot obtain the correct coagulation curve.

[0003] The traditional structure of the suspension wire in the thrombelastograph is usually composed of a suspension wire joint in the upper part and a torsion wire in the lower part. The suspension wire joint is fixed to the base, and a probe is suspended at the lower end of the torsion wire. The function of the suspension wire determines that the diameter of the torsion wire should not be too large. The structure of the traditional torsion wire is a structure with large ends and a small middle (such as: the diameter of the two ends is 0.6mm, and the diameter of the middle part is 0.2mm). The traditional torsion wire processing method mainly adopts a tungsten wire with a larger diameter (such as 0.6mm). By using a grinding process on the middle part of the tungsten wire, the diameter of the middle part of the tungsten wire reaches 0.2mm, making the torsion wire structure a structure with large ends and a small middle.

[0004] Since the concentricity of the twisted wire needs to be ensured, the twisted wire has high precision requirements during the processing, and the diameter of the twisted wire structure is small. The radial diameter of the middle part is easily uneven during the processing, making the processing difficult and the yield rate low. In addition, the precision and stability requirements of the processing equipment are high. The qualified rate of the twisted wire is low, which increases the cost of the suspension wire. Summary of the invention

[0005] The purpose of the present invention is to provide a torque sensing component suitable for a thrombelastograph to replace the traditional suspension wire with low production efficiency, in view of the problem that the torsion wire in the suspension wire of a thrombelastograph in the prior art is difficult to manufacture, resulting in low production efficiency of the torsion wire.

[0006] According to the research of technicians in the field, traditional suspension wires are generally not replaced by springs, because during the application of the suspension wire, the axial stiffness of the suspension wire is large and no stretching or compression occurs. If a spring is used to replace the suspension wire structure, the spring will be stretched or compressed in the axial direction, which will make the measured data extremely inaccurate. The method of replacing the suspension wire with a spring is basically considered to be an unrealistic solution after the research of technicians in the field, thus guiding technicians in the field not to use springs to replace conventional suspension wires in the torque sensing assembly suitable for thromboelastographs. There is a technical bias. The present application overcomes this technical bias and adopts the following technical solution:

[0007] A torque sensing component suitable for a thrombelastograph comprises: a U-shaped bracket and a rotating shaft, wherein the rotating shaft is vertically arranged on the U-shaped bracket and can rotate around its own axis, and both ends of the rotating shaft are arranged on the U-shaped bracket; and a spring, wherein the spring is sleeved on the rotating shaft, one end of the spring is fixed on the rotating shaft, and the other end of the spring is fixed on the U-shaped bracket.

[0008] As a preferred embodiment of the present invention, the U-shaped bracket includes a first horizontal axis, a second horizontal axis and a vertical axis, the first horizontal axis is arranged at the upper end of the vertical axis, the second horizontal axis is arranged at the lower end of the vertical axis, the first horizontal axis and the second horizontal axis are respectively provided with bearings with overlapping axes, the rotating shaft is arranged on the two bearings, the rotating shaft is fixedly arranged on the bearings and rotates with the bearings, so that the rotating shaft will not move along its own axis, so that the spring will not be stretched or compressed, and the rotating shaft rotates around its own axis by being subjected to torsion, thereby transmitting the torsion to the spring.

[0009] As a preferred embodiment of the present invention, the torque sensing component suitable for the thromboelastograph also includes a connecting bracket, which is fixedly arranged at the lower part of the rotating shaft, and the lower part of the connecting bracket is used to connect the probe in the elastograph to facilitate the installation of the probe, and the connecting bracket as a whole is used to transmit the torque received by the probe.

[0010] As a preferred embodiment of the present invention, both ends of the rotating shaft are arranged in a cone or a truncated cone shape, and the two ends of the rotating shaft are respectively arranged in the two bearings. The diameter of the cone or the truncated cone close to the middle of the rotating shaft is larger than the diameter away from the middle of the rotating shaft. The maximum diameter of the cone or the truncated cone is larger than the inner diameter of the bearing, so that the cone or the truncated cone can be placed in the bearing. The rotating shaft is arranged in the bearing, and the conical surfaces or the truncated cone surfaces at both ends of the rotating shaft are respectively in contact with the two bearings to limit the axis of the rotating shaft, so that the rotating shaft can rotate and the rotating shaft will not move along its own axis. The rotating shaft can transmit the torque transmitted by the probe, and the cone or the truncated cone is in inclined contact with the bearing, which is convenient for the installation of the rotating shaft, and can prevent the rotating shaft from falling, thereby reducing the friction between the rotating shaft and the bearing.

[0011] As a preferred embodiment of the present invention, the bearing is a jewel bearing. The jewel bearing is used in precision instruments and can greatly reduce the friction between the rotating shaft and the bearing, reduce the measurement error, and improve the accuracy of the result.

[0012] As a preferred embodiment of the present invention, the connecting bracket is a triangular structure, a connecting rod of the connecting bracket is passed through the rotating shaft, the second horizontal axis is inside the connecting bracket of the triangular structure, the rotating shaft rotates during the measurement process to drive the connecting bracket to rotate, and the connecting bracket does not contact the second horizontal axis. Since the test cup rotates at an angle of 4 degrees and 45 minutes during the thrombus elasticity test, the torque transmitted to the rotating shaft drives the rotating shaft to rotate at a smaller angle. During the test, the connecting bracket will not contact the second horizontal axis, and the connecting bracket is welded to the rotating shaft.

[0013] As a preferred solution of the present invention, one end of the spring is welded to the rotating shaft, and the other end of the spring is welded to the U-shaped bracket, so as to ensure that both ends of the spring are fixed, so that when the rotating shaft rotates, the spring can follow the rotation of the rotating shaft and make deformation, so that the subsequent processor can convert the deformation into an electrical signal and display it on the display screen.

[0014] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0015] 1. The traditional suspension wire structure is replaced by setting a rotating shaft and a spring. The rotating shaft and the spring are easy to manufacture, and have a simple structure and sensitive response. The problems of difficulty in manufacturing torsion wire and low production efficiency are overcome, so that the sensing device of the thromboelastogram can be quickly manufactured with a high yield and low cost. Both ends of the spring in the present application are fixed, and both ends of the rotating shaft are arranged on a U-shaped bracket, which is equivalent to limiting the rotating shaft on the axis and not moving relative to its own axis, so that the spring always maintains its original length. The spring will not be compressed or stretched in the eyes of technicians in this field. The combination of the rotating shaft and the spring in the present application makes it possible for traditional technicians to replace the suspension wire with a spring, which is impossible, and overcomes the prejudice that traditional springs in this field cannot replace suspension wires. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the present invention;

[0017] Figure 2 for Figure 1 Projection diagram in the middle A direction;

[0018] Markings in the figure: 1-U-shaped bracket, 11-first horizontal axis, 12-second horizontal axis, 13-vertical axis, 2-rotating shaft, 3-spring, 4-bearing, 5-connecting bracket. DETAILED DESCRIPTION

[0019] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0020] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0021] Example 1

[0022] like Figure 1 and Figure 2As shown, a torque sensing component suitable for a thromboelastograph comprises: a U-shaped bracket 1 and a rotating shaft 2, wherein the rotating shaft 2 is vertically arranged on the U-shaped bracket 1 and can rotate around its own axis, and both ends of the rotating shaft 2 are arranged on the U-shaped bracket 1, and the rotating shaft 2 does not move along its own axis; a spring 3, wherein the spring 3 is sleeved on the rotating shaft 2, one end of the spring 3 is fixed on the rotating shaft 2, and the other end of the spring 3 is fixed on the U-shaped bracket 1. In this embodiment, the U-shaped bracket 1 comprises a first transverse axis 11, a second transverse axis 12, and a second transverse axis 13. 12 and a vertical axis 13, the first horizontal axis 11 is arranged at the upper end of the vertical axis 13, the second horizontal axis 12 is arranged at the lower end of the vertical axis 13, the first horizontal axis 11 and the second horizontal axis 12 are respectively provided with bearings 4 with coincident axes, the rotating shaft 2 is arranged on the two bearings 4, in this embodiment, one end of the spring 3 is fixed to the lower part of the rotating shaft 2, the other end of the spring 3 is fixed to the first horizontal axis 11, the spring 3 is sleeved on the rotating shaft 3, and except for the end of the spring 3 being fixed to the rotating shaft 2, the rest of the spring 3 does not contact the rotating shaft 2.

[0023] like Figure 2 As shown, the torque sensing component suitable for the thromboelastogram also includes a connecting bracket 5, which is fixedly arranged at the lower part of the rotating shaft 2. The connecting bracket 5 is a triangular structure. A connecting rod of the connecting bracket 5 is passed through the rotating shaft 2, and the second horizontal axis 12 is arranged inside the connecting bracket 5 of the triangular structure.

[0024] like Figure 1 and Figure 2 As shown, both ends of the rotating shaft 2 are arranged as cones or frustums, and the cones or frustums at both ends of the rotating shaft 2 are respectively arranged in the two bearings 4. In this embodiment, the bearings 4 are jewel bearings.

[0025] In this embodiment, one end of the spring 3 is welded to the rotating shaft 2, the other end of the spring 3 is welded to the UU-shaped bracket 1, and the connecting bracket 5 is welded to the rotating shaft 2. In this embodiment, the diameter of the spring 3 is 0.18mm~0.24mm, specifically 0.2mm and 0.22mm, etc. The rotating shaft 2 is a cylindrical structure, which facilitates the rotation of the rotating shaft on the U-shaped bracket 1.

[0026] The specific working process of the present application is as follows: the sensing component is placed in the thromboelastograph, a probe is connected to the lower end of the connecting rod bracket 5, and the probe is placed in the test cup. The torque generated by the rotation of the blood in the test cup is transmitted to the rotating shaft 2, and the rotating shaft 2 transmits the torque to the spring 3. Since the two ends of the spring 3 are respectively fixed on the rotating shaft 2 and the connecting rod bracket 5, and the connecting rod bracket 5 limits the rotating shaft 2 to prevent the axial movement of the rotating shaft 2, the spring 3 will not produce axial compression and extension, and the spring 3 is only subjected to torsion. The combination of the spring 3 and the rotating shaft 2 can well replace the traditional suspension wire, overcoming the difficulties of difficult production of torsion wire and low production efficiency in traditional thromboelastographs, and at the same time overcoming the technical prejudice that traditional springs in this field cannot replace suspension wires.

[0027] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A torque sensing component suitable for a thromboelastograph, characterized in that: The invention comprises a U-shaped bracket (1) and a rotating shaft (2), wherein the rotating shaft (2) is arranged on the U-shaped bracket (1) vertically and rotatably around its own axis, and both ends of the rotating shaft (2) are arranged on the U-shaped bracket (1); and further comprises a spring (3), wherein the spring (3) is sleeved on the rotating shaft (2), one end of the spring (3) is fixed on the rotating shaft (2), and the other end of the spring (3) is fixed on the U-shaped bracket (1); The U-shaped bracket (1) comprises a first transverse axis (11), a second transverse axis (12) and a vertical axis (13); the first transverse axis (11) is arranged at the upper end of the vertical axis (13); the second transverse axis (12) is arranged at the lower end of the vertical axis (13); bearings (4) whose axes coincide with each other are respectively arranged on the first transverse axis (11) and the second transverse axis (12); and the rotating shaft (2) is arranged on the two bearings (4); It also comprises a connecting bracket (5), wherein the connecting bracket (5) is fixedly arranged at the lower part of the rotating shaft (2); a probe is connected to the lower end of the connecting rod bracket (5); Both ends of the rotating shaft (2) are arranged in a cone or truncated cone shape, and both ends of the rotating shaft (2) are arranged in the two bearings (4) respectively.

2. The torque sensing assembly for a thromboelastograph according to claim 1, characterized in that: The bearing (4) is a jewel bearing.

3. The torque sensing assembly for a thromboelastograph according to claim 1, characterized in that: The connecting bracket (5) is a triangular structure, a connecting rod of the connecting bracket (5) is passed through the rotating shaft (2), and the second transverse axis (12) is arranged inside the connecting bracket (5) of the triangular structure.

4. The torque sensing assembly for a thromboelastograph according to claim 1, characterized in that: One end of the spring (3) is welded to the rotating shaft (2), and the other end of the spring (3) is welded to the U-shaped bracket (1).

5. The torque sensing assembly for a thromboelastograph according to claim 1, characterized in that: The diameter of the spring (3) is 0.18 mm to 0.24 mm, and the rotating shaft (2) is a cylindrical structure.

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