A string-type phantom device for ultrasonic transcranial Doppler blood flow analyzer

Abstract

The present invention discloses a string-type phantom device for an ultrasonic transcranial Doppler blood flow analyzer. The cavity of a water tank is provided with a support rod for hanging a Doppler probe. The Doppler line rotates on the bottom surface of the water tank through a pulley group driven by a first motor; the first motor is driven by a controller unit. The main calibration items are blood flow velocity error, blood flow detection depth and blood flow direction identification; by injecting a proper amount of water or medium into the water tank to act as a human body medium, the Doppler probe is clamped by a chuck unit that can rotate, identify and adjust the angle, and the spectrum is obtained. The Doppler probe is moved in the horizontal direction of the string transmission by a screw rod, and the motion measurement is performed to complete the measurement of the parameters required for blood flow velocity error, blood flow detection depth and blood flow direction identification. It has a simple structure, low manufacturing and maintenance costs, is not easy to damage, and is easy to scrub. The device as a whole meets relevant standards and has strong practicality and wide applicability.

Description

Technical Field

[0001] The invention relates to a string-type phantom device, in particular to a string-type phantom device for an ultrasonic transcranial Doppler blood flow analyzer, and belongs to the technical field of blood flow analysis quality detection. Background Art

[0002] Transcranial Doppler ultrasonogralhy: a technology that uses ultrasonic Doppler technology to measure intracranial and extracranial blood flow, referred to as TCD.

[0003] TCD mainly assesses blood flow conditions based on the blood flow velocity. Since the inner diameter of the cerebral arteries is relatively fixed under the same conditions, the corresponding changes in local cerebral blood flow can be inferred based on the decrease or increase in cerebral blood flow velocity.

[0004] Blood flow velocity reflects the lumen size and blood flow of cerebral arteries. When the blood flow is constant, the blood flow velocity is inversely proportional to the lumen size. When the lumen is severely narrowed (90%) or completely obstructed, the blood flow velocity decreases. The values ​​between individuals can vary greatly, but the intra-individual differences are small, and the left and right sides are basically symmetrical. If there is a big difference between the two sides, it can be considered abnormal.

[0005] At present, due to the popularization of ultrasonic Doppler technology in medicine, the corresponding ultrasonic Doppler diagnostic instruments are also widely used in clinical medicine, and their corresponding detection methods and detection standards are also introduced one after another.

[0006] According to the PRC Medical Industry Standard YY 0593-2005 Ultrasonic Transcranial Doppler Blood Flow Analyzer, 6.1.3, the test phantoms recommended are the blood-like fluid phantom and the string-like phantom. However, most of the current testing equipment still relies on imports, and the test specimens are mainly blood-like fluid phantoms (PRC Medical Industry Standard YY / T 0458-2003 Technical Requirements for Ultrasonic Doppler Blood-like Fluid Phantoms). The purpose of the blood-like fluid phantom is to generate a Doppler frequency spectrum that simulates the blood in human blood vessels. Generally, only the flow rate is set, monitored and calibrated. Although some manufacturers on the market provide reference flow velocity values ​​corresponding to the flow rate, due to the large and unstable difference in the flow velocity between the center of the pipe and near the pipe wall, this method is more suitable for design verification and factory inspection. Secondly, the phantom is relatively complicated to carry, assemble, test and operate.

[0007] Therefore, it is necessary to design a string-type phantom device for ultrasonic transcranial Doppler blood flow analyzer as an arbitration method in combination with IEC 61206-1993 "Ultrasound. Continuous-wave Doppler system. Test procedure" and the string-type Doppler test piece recommended in Part 3 "Specialized Doppler Test Pieces" 3.1.1 of the Medical Industry Standard of the People's Republic of China YY / T 0705-2008 / IEC 61206:1993 "Ultrasonic Continuous-wave Doppler System Test Procedure" as a standard. Summary of the invention

[0008] In order to solve the deficiencies of the prior art, the object of the present invention is to provide a string-type phantom device for an ultrasonic transcranial Doppler blood flow analyzer.

[0009] In order to achieve the above object, the present invention adopts the following technical solution:

[0010] A string-type phantom device for an ultrasonic transcranial Doppler blood flow analyzer, wherein a support rod for hanging a Doppler probe is provided at the cavity of a water tank, and the Doppler string rotates on the bottom surface of the water tank through a pulley group driven by a first motor;

[0011] The first motor is driven by a controller unit.

[0012] The Doppler probe is suspended on the support rod through the clamp unit.

[0013] The chuck unit includes a gripper assembly, a transmission assembly, a second motor, and a rotary encoder;

[0014] The transmission assembly includes a driving shaft, and a first driven shaft and a second driven shaft linked by gears; the first driven shaft is connected to the gripping claw assembly, and the second driven shaft is connected to the rotary encoder; the second motor drives the driving shaft, and links the gripping claw assembly and the rotary encoder through the transmission assembly.

[0015] The gripper assembly comprises a hollow shell for accommodating a first connecting rod, a second connecting rod and a pressing rod, wherein a horizontal slide groove is provided at the front end of the shell; a pair of grippers are placed outside the shell, and the gripper shaft at the end thereof passes through the slide groove and is respectively axially connected to one end of the first connecting rod and the second connecting rod, and the other ends of the first connecting rod and the second connecting rod are axially connected to the bottom end of the pressing rod, and the pressing rod passes through a pressing hole at the top of the shell and moves longitudinally along the pressing hole; and a return spring is sleeved on the pressing rod between a pressing cap at the top end of the pressing rod and the shell;

[0016] The first driven shaft is fixedly connected to the rear end of the housing.

[0017] Furthermore, the transmission assembly further includes a central shaft connected to the central gear;

[0018] The driving shaft, the first driven shaft and the second driven shaft are respectively gear-connected with the central gear through gears.

[0019] Furthermore, the second motor and the rotary encoder are connected to the control unit respectively.

[0020] The controller unit drives the second motor to rotate,

[0021] The controller unit receives feedback from the rotary encoder and outputs the rotation angle of the gripper assembly.

[0022] The support rod comprises a screw rod and a slide rod horizontally arranged with respect to the longitudinal surface, and the Doppler probe is connected to the screw rod through a nut;

[0023] The controller unit drives the third motor shaft to rotate the lead screw, thereby linking the Doppler probe to slide along the slide bar.

[0024] The pulley assembly includes guide wheels arranged at both ends of the bottom surface of the water tank, and a main pulley arranged on the side wall of the water tank;

[0025] The controller unit drives the first motor to rotate the main pulley, and the linkage line rotates circularly.

[0026] The bottom surface of the water tank is inclined at an angle of 30-60° along the horizontal direction.

[0027] The two ends of the water tank are respectively provided with a water inlet and a water outlet, and a water injection / drainage drive unit is provided between the water inlet and the water outlet, including a water inlet pump, a water outlet pump, and a pair of three-way pipes;

[0028] The main pipe of the three-way pipe is connected to the water inlet and the water outlet respectively, the water inlet pump and the water outlet pump are connected between the three-way pipes respectively, and the two ends are connected to the branch pipes of the three-way pipe respectively;

[0029] The controller unit drives the water inlet pump and the water outlet pump to realize the filling and drainage of the water tank.

[0030] The present invention is beneficial in that:

[0031] The string-type phantom device of the ultrasonic transcranial Doppler blood flow analyzer of the present invention mainly calibrates the blood flow velocity error, blood flow detection depth and blood flow direction identification; by injecting a proper amount of water or medium into the water tank to act as a human body medium, the Doppler probe is clamped by a chuck unit that can rotate, identify and adjust the angle, the spectrum is obtained, the Doppler probe is moved in the horizontal direction of the string transmission by a screw rod, and the motion measurement is performed to complete the measurement of the parameters required for blood flow velocity error, blood flow detection depth and blood flow direction identification. It has a simple structure, low manufacturing and maintenance costs, is not easy to damage, is easy to scrub, and the device as a whole meets the relevant standards, and has strong practicality and wide applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 The present invention is a schematic structural diagram of a string-type phantom device of an ultrasonic transcranial Doppler blood flow analyzer.

[0033] Figure 2 It is a schematic structural diagram of the chuck unit of the present invention.

[0034] Figure 3 It is a schematic structural diagram of the gripper assembly of the present invention.

[0035] Figure 4 It is a schematic structural diagram of the water injection / drainage drive unit of the present invention.

[0036] The meanings of the symbols in the accompanying drawings are as follows: A, chuck unit, B, controller unit, C, water tank;

[0037] 1. Second motor, 2. Rotary encoder, 3. Driving gear, 4. Driving shaft, 5. Center gear, 6. Center shaft, 7. First gear, 8. First driven shaft, 9. Second gear, 10. Second driven shaft, 11. Cover plate, 12. Pressing cap, 13. Gripping claw, 14. Housing, 15. First connecting rod, 16. Second connecting rod, 17. Pressing rod, 18. Return spring, 19. Water inlet, 20. Drain outlet, 21. Main pulley, 22. Guide wheel, 23. Screw, 24. Sliding rod. DETAILED DESCRIPTION

[0038] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0039] The rotary encoder selected is Omron E6B2-CWZ6C.

[0040] The invention discloses a string-type phantom device of an ultrasonic transcranial Doppler blood flow analyzer, which is composed of a water tank, a clamp unit, a controller unit, a pulley block and a Doppler string.

[0041] The water tank is rectangular, and the bottom surface of the water tank is set at an angle of 30°. The drain is set at the bottom of the water tank, and the water inlet is set at the top of the water tank. A water injection / drainage drive unit is set between the water inlet and the water outlet, which consists of an inlet pump, an outlet pump, and a pair of tee pipes; the main pipes of the tee pipes are connected to the inlet and the outlet respectively, and the inlet pump and the outlet pump are connected between the tee pipes, and the two ends are connected to the branch pipes of the tee pipes respectively; the controller unit drives the inlet pump and the outlet pump to realize water injection and drainage of the water tank.

[0042] The pulley block consists of an upper guide wheel, a lower guide wheel and a main pulley. The upper and lower guide wheels are respectively arranged at the two ends of the bottom of the water tank, and the main pulley is arranged on the side wall of the water tank (the end with the higher bottom surface). The Doppler line is arranged around the upper and lower guide wheels and the main pulley. The controller unit drives the first motor to rotate the main pulley, and the linkage line rotates cyclically.

[0043] The cavity of the water tank is provided with a pair of screw rods and sliding rods arranged horizontally on the longitudinal plane. The clamp unit for clamping the Doppler probe is connected with the screw rod and the sliding rod through a nut. The controller unit drives the third motor shaft to rotate the screw rod, and the Doppler probe is linked to slide along the sliding rod.

[0044] The chuck unit is composed of a gripper assembly, a transmission assembly, a second motor and a rotary encoder.

[0045] The transmission assembly includes a transmission housing, in the cavity of which a central gear with an outer diameter of 60 mm is provided, which rotates around the central axis; a first gear with an outer diameter of 15 mm is gear-connected with the central gear, and is linked to the gripping claw assembly through the first driven shaft of the axis; a first gear with an outer diameter of 30 mm is gear-connected with the central gear, and is linked to the rotary encoder through the second driven shaft of the axis; the motor shaft is the driving shaft, and is linked to the central gear through the driving gear with an outer diameter of 15 mm on the shaft.

[0046] The transmission housing cavity is closed by a cover plate, and separates the transmission housing and the chuck device.

[0047] The controller unit is connected to the second motor and the rotary encoder, drives the second motor to rotate, receives feedback from the rotary encoder, and outputs the rotation angle of the gripping claw assembly.

[0048] The gripper assembly is composed of a gripper and a connecting rod assembly in a housing. The connecting rod assembly includes a first connecting rod and a second connecting rod, one end of which is axially connected to the bottom end of the pressing rod, and the other ends of the first connecting rod and the second connecting rod are respectively axially connected to the shafts at the end of the gripper; the gripper slides along the horizontal slide groove at the front end of the housing through the shaft at the end, and the pressing rod passes through the pressing hole at the top end of the housing and moves longitudinally along the pressing hole, between the pressing cap at the top end of the pressing rod and the housing, and a reset spring is sleeved on the pressing rod. The first driven shaft is fixed to the rear end of the housing to link the entire gripper assembly.

[0049] When using:

[0050] Fix the handle of the Doppler probe to be tested on the grip so that the axis of the Doppler probe handle (the axis of the Doppler sound beam) is in a vertical direction.

[0051] The controller unit works to fill the water tank with water; the controller unit drives the water inlet pump of the water filling / drainage driving unit to work to complete the automatic water filling of the water tank. Inject an appropriate amount of water or medium to act as a human body medium to ensure that the front of the Doppler probe is immersed in water, and the water filling is completed.

[0052] The controller unit drives the Doppler string to work and controls the string speed to be set in a constant speed mode of 50 cm / S; the controller unit drives the second motor to work and rotates the gripper assembly until a clear spectrum is displayed on the ultrasonic transcranial Doppler blood flow analyzer; the controller unit drives the third motor to work and drives the chuck unit, which links the Doppler probe to move and measure in the horizontal direction of the string transmission, thereby completing the measurement of blood flow velocity error, blood flow detection depth and parameters required for blood flow direction identification.

[0053] After the measurement is completed, the controller unit drives the water outlet pump to work and complete the automatic drainage of the sink.

[0054] Preferably, the water filling / drainage driving unit is arranged at the bottom of the water tank, that is, the part below the 30° bottom surface.

[0055] Preferably, the controller unit is arranged on the side of the sink and is integrated with the sink.

[0056] Preferably, the sink is made of acrylic material and has an integrated structure.

[0057] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the above embodiments do not limit the present invention in any form, and any technical solution obtained by equivalent replacement or equivalent transformation falls within the protection scope of the present invention.

Claims

1. A string-type phantom device for an ultrasonic transcranial Doppler blood flow analyzer, characterized in that: The cavity of the water tank is provided with a support rod for hanging the Doppler probe, and the Doppler string rotates on the bottom surface of the water tank through a pulley group driven by a first motor, and the first motor is driven by a controller unit; The Doppler probe is suspended on the support rod through a chuck unit, and the chuck unit includes a gripper assembly, a transmission assembly, a second motor, and a rotary encoder; the transmission assembly includes a driving shaft, and a first driven shaft and a second driven shaft linked by gears; the first driven shaft is connected to the gripper assembly, and the second driven shaft is connected to the rotary encoder; The second motor drives the active shaft, which is linked to the gripper assembly and the rotary encoder through the transmission assembly; the gripper assembly includes a hollow shell for accommodating the first connecting rod, the second connecting rod and the pressing rod, and a horizontal slide groove is provided at the front end of the shell; a pair of grippers are placed outside the shell, and the gripper shafts at the ends are respectively connected to one end of the first connecting rod and the second connecting rod through the slide groove, and the other ends of the first connecting rod and the second connecting rod are connected to the bottom end of the pressing rod, and the top end of the pressing rod passes through the pressing hole at the top of the shell and moves longitudinally along the pressing hole; and a return spring is sleeved on the pressing rod between the pressing cap at the top end of the pressing rod and the shell; the first driven shaft is fixed to the rear end of the shell; The transmission assembly also includes a central shaft connected to the central gear; the driving shaft, the first driven shaft and the second driven shaft are respectively connected to the central gear through gears; The second motor and the rotary encoder are respectively connected to the controller unit, the controller unit drives the second motor to rotate, the controller unit receives feedback from the rotary encoder, and outputs the rotation angle of the gripper assembly; The support rod comprises a screw rod and a slide rod horizontally arranged on the longitudinal surface, and the Doppler probe is connected to the screw rod through a nut; the controller unit drives the third motor shaft to rotate the screw rod, and the Doppler probe is linked to slide along the slide rod.

2. The string-type phantom device of ultrasonic transcranial Doppler blood flow analyzer according to claim 1, characterized in that: The pulley block comprises guide wheels arranged at both ends of the bottom surface of the water tank, and a main pulley arranged on the side wall of the water tank; the controller unit drives the first motor to rotate the main pulley, and the linked string rotates cyclically.

3. The string-type phantom device of ultrasonic transcranial Doppler blood flow analyzer according to claim 1, characterized in that: The bottom surface of the water tank is inclined at an angle of 30°-60° along the horizontal direction.

4. The string-type phantom device of ultrasonic transcranial Doppler blood flow analyzer according to claim 1, characterized in that: A water inlet and a water outlet are respectively arranged at both ends of the water tank, and a water filling / drainage driving unit is arranged between the water inlet and the water outlet, including an inlet pump, an outlet pump, and a pair of tee pipes; the main pipes of the tee pipes are respectively connected to the water inlet and the water outlet, the inlet pump and the outlet pump are respectively connected between the tee pipes, and the two ends are respectively connected to the branch pipes of the tee pipes; the controller unit drives the inlet pump and the outlet pump to realize water filling and drainage of the water tank.

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