Medical transducer test fixture

Abstract

The utility model relates to the technical field of test fixtures, and particularly discloses a medical transducer test fixture which comprises a positioning shaft, a cylindrical array transducer is placed at the large cylindrical end of the positioning shaft, a fixing plate is fixedly connected to the outer side of the positioning shaft, and a supporting ring is fixedly connected to the end, away from the positioning shaft, of the fixing plate. A clamping assembly for clamping the cylindrical array transducer in the positioning shaft is arranged between the supporting ring and the positioning shaft; according to the medical transducer testing clamp, positioning of a transducer in the circumferential direction is achieved through the regular polygon inner hole, then the axial position of the transducer is accurately positioned through the adjustable mandrel, the clamping force of the clamping assembly is adjusted, the clamping force of the clamping assembly is adjusted, and the testing efficiency of the transducer is improved. A wedge-shaped chute mechanism is adopted to realize the normal displacement of a contact along each surface of the regular polygon and cylindrical array transducer, so that the purpose that the contact contacts and is separated from a bonding pad is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to test fixture technical field, concretely is a kind of medical transducer test fixture. BACKGROUND

[0002] Ultrasonic transducer is a kind of device that can convert electrical and acoustic energy into each other, especially widely used in medical diagnosis field. In the production of ultrasonic probe, whether its electrical performance and acoustic performance are qualified needs to be measured, especially the internal resistance and capacitance during production need to be measured to determine whether the transducer made in the production process has problems, which can greatly avoid defective products into subsequent production process. And medical cylindrical array or regular polygon array transducer is often used to realize full-circumferential high-resolution imaging of blood vessels, digestive tract, trachea and other lumen organs, and its structure size is small, usually less than 2.5mm in diameter. When testing electrical and acoustic performance, contact head is needed to contact the signal pad and ground pad on the surface of the transducer, or the ground and signal wires are led out. The small size structure needs to be magnified by microscope to contact the pad, which is time-consuming and laborious, and manual operation is likely to scratch the pad and the flexible plate circuit.

[0003] The existing test method is mostly manual operation, using simple clamping mechanism, such as flat tongs to clamp one end of the transducer, then finding the corresponding signal and ground pad through microscope, finally using pen to contact test electrical performance, or leading out the wire to test again. This method not only wastes manpower, but also has the risk of damaging the transducer circuit during testing. Although some operators use clamping table to clamp the transducer, and then contact the signal and ground of the transducer by moving platform, the pad position can be found without microscope through designed position, but only one side can be tested, and the platform needs to be rotated frequently, and it is not universal for acoustic performance test. Therefore, we propose a medical transducer test fixture. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a medical transducer test fixture to solve the problem that only one side can be tested, the platform needs to be rotated frequently, and it is not universal for acoustic performance test.

[0005] To achieve the above purpose, the utility model provides the following technical scheme: a medical transducer test fixture, comprising a positioning shaft, the positioning shaft is composed of a large cylinder and a small cylinder, the large cylinder end of the positioning shaft places a cylindrical array transducer, the outer side of the positioning shaft is fixedly connected with a fixed plate, the end of the fixed plate away from the positioning shaft is fixedly connected with a support ring, a clamping assembly for clamping the cylindrical array transducer in the positioning shaft is arranged between the support ring and the positioning shaft;

[0006] The positioning shaft small cylindrical end outer side is slidably connected with a clutch ring, and the clutch ring outer side is provided with an adjusting assembly for adjusting the clamping force of the clamping assembly.

[0007] The positioning shaft inner wall is slidably connected with a mandrel, which is a regular polygonal rod design, and the number of edges is the same as the number of array elements of the transducer.

[0008] The positioning shaft large cylindrical end outer side is uniformly punched, the clamping assembly comprises a plurality of thimbles, the plurality of thimbles and the holes on the surface of the positioning shaft are one-to-one corresponding, and the thimbles and the holes on the surface of the positioning shaft are slidably connected, the thimbles are provided with a spring one outside, one end of the spring one is fixedly connected with the inner wall of the clutch ring, the other end of the spring one is fixedly connected with the thimble, the thimble is fixedly connected with a wedge block at the end away from the positioning shaft, and the plurality of wedge blocks are equidistantly distributed outside the clutch ring.

[0009] In some embodiments, the fixing plate outer circle has two lugs matched with two grooves in the inner wall of the clutch ring, and the clutch ring slides axially along the lugs on the fixing plate.

[0010] In some embodiments, the diameter of the end of the thimble close to the positioning shaft is smaller than the diameter of the end away from the positioning shaft.

[0011] In some embodiments, the adjusting assembly comprises a locking nut located outside the end of the clutch ring away from the wedge block, the locking nut is in abutment with the clutch ring, the locking nut is threadedly connected with the surface of the positioning shaft, and the end of the clutch ring close to the wedge block is provided with a beveled sliding groove matched with the wedge block.

[0012] In some embodiments, the positioning shaft is provided with a spring two outside, one end of the spring two is fixed with the fixing plate, and the other end of the spring two is fixed with the clutch ring.

[0013] In some embodiments, the surface of the thimble is provided with a mesa, and the mesa of the thimble supports the spring one.

[0014] In some embodiments, the plurality of thimbles are arranged in a circumferential manner.

[0015] In some embodiments, the wedge block is provided with a hole, and the end of the thimble close to the wedge block is matched with the hole.

[0016] The utility model at least has the following beneficial effects:

[0017] 1. The application is in use by the regular polygon hole realizes the positioning of the transducer circumferential direction, then through the adjustable mandrel accurate positioning transducer's axial position, adopts the wedge-shaped sliding groove mechanism to realize the normal displacement of the contact along the regular polygon and the cylindrical array transducer surface, achieves the purpose of contact contact and disengaging pad, through the spring of the calculated design realizes the soft contact of the contact and signal and ground pad, compared with the existing artificial operation or the mechanism movement hard contact pad, can better protect the circuit conduction of the transducer, save time and effort, improve the stability of the transducer.

[0018] 2. By circumferential layout of the contact, the transducer pad is fully covered, which can be completed at one time, and the electrical performance and acoustic performance test are also considered, compared with the existing electrical performance and acoustic performance test fixture design and manual adjustment of the transducer pad position and then test, greatly saves the labor cost and the worker operation time. BRIEF DESCRIPTION OF DRAWINGS

[0019] Fig. 1 It is the test fixture assembly drawing schematic diagram of the utility model;

[0020] Fig. 2 It is the test fixture main view section view schematic diagram of the utility model;

[0021] Fig. 3 It is the positioning shaft structure schematic diagram of the utility model.

[0022] In the drawing: 1, cylindrical array transducer; 2, positioning shaft; 3, support ring; 4, thimble; 5, spring one; 6, wedge block; 7, clutch ring; 8, mandrel; 9, lock nut; 10, spring two; 11, fixed plate. DETAILED DESCRIPTION

[0023] The technical scheme in the embodiments of the utility model will be described clearly and completely in combination with the drawings in the embodiments of the utility model, obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor belong to the scope of protection of the utility model.

[0024] Please refer to Figs. 1 to 3The utility model provides a technical scheme: a medical transducer test fixture, including positioning shaft 2, the inner wall sliding joint of positioning shaft 2 has mandrel 8, and mandrel 8 is the design of regular polygon bar, and the number of sides is same with the element number of transducer, and positioning shaft 2 is composed of big cylinder and small cylinder, and the big cylinder end of positioning shaft 2 places cylindrical array transducer 1, and the outer side fixed connection of positioning shaft 2 has fixed plate 11, and the fixed plate 11 away from positioning shaft 2 one end fixed connection has support ring 3, and support ring 3 is equipped with the clamping assembly of the inside cylindrical array transducer 1 of positioning shaft 2 between clamping between positioning shaft 2 small cylinder end outer side sliding joint has the clutch ring 7, and the outer side of clutch ring 7 is equipped with the adjusting assembly of adjusting the clamping force of clamping assembly.

[0025] The big cylinder end outside circumference of positioning shaft 2 is uniformly distributed and is punched, and the clamping assembly includes a plurality of thimbles 4, the thimbles 4 can be freely moved in the hole, and are used as fixed clamping, the plurality of thimbles 4 and the hole of the surface of positioning shaft 2 one-to-one correspond, the plurality of thimbles 4 are distributed in the circumferential type, and the thimbles 4 and the hole of the surface of positioning shaft 2 are slidably connected, the outer side of thimble 4 is equipped with spring one 5, one end of spring one 5 is fixedly connected with the inner wall of clutch ring 7, the end of thimble 4 close to positioning shaft 2 is small in diameter, usually around 0.2mm diameter, the surface of thimble 4 is equipped with mesa, the mesa of thimble 4 supports spring one 5, the end of thimble 4 away from positioning shaft 2 is fixedly connected with wedge block 6, wedge block 6 is punched with hole, and one end of thimble 4 is matched with it, and both are fixed by tight screw, and a plurality of wedge blocks 6 are equidistantly distributed on the outer side of clutch ring 7.

[0026] The outer circle of fixed plate 11 has two lugs matched with the two grooves of the inner wall of clutch ring 7, clutch ring 7 is along the lug of fixed plate 11, and is used to limit the circumferential rotation of clutch ring 7, and clutch ring 7 is axially slid along the lug on fixed plate 11.

[0027] In some embodiments, the end of thimble 4 close to positioning shaft 2 is smaller in diameter than the end of thimble 4 away from positioning shaft 2.

[0028] The adjusting assembly includes lock nut 9 located on the outer side of clutch ring 7 away from wedge block 6, lock nut 9 is in contact with clutch ring 7, lock nut 9 is threadedly connected with the surface of positioning shaft 2, clutch ring 7 is opened with inclined surface sliding groove matched with wedge block 6 along the circumferential direction, positioning shaft 2 is equipped with spring two 10 on the outer side, one end of spring two 10 is fixed with fixed plate 11, and the other end of spring two 10 is fixed with clutch ring 7.

[0029] In use, when the locking nut 9 is rotated clockwise, the clutch ring 7 is pushed forward (with the end where the transducer is mounted defined as the front end), and the spring 10 is compressed, the clutch ring 7 pushes the wedge block 6 away from the center of the support ring 3 in the circumferential radial direction, and drives the probe 4 to move outward synchronously, when the locking nut 9 reaches the maximum stroke, it can no longer be rotated, at this time the device is completely opened, and the transducer can be put in (if the transducer is taken out, the process is repeated).

[0030] Conversely, when the locking nut 9 is rotated counterclockwise, the spring 10 is rebounded, and the clutch ring 7 is moved in the opposite direction, gradually moving away from the wedge block 6, so that the wedge block 6 has a center return stroke, the probe 4 is retracted to the center of the fixed ring of the support ring 3 under the elastic force of the spring 1, until the probe 4 abuts against the transducer pad, thereby connecting the transducer and the test instrument (the probe 4 is connected to the test instrument through a cable), and the force of the spring 1 is small, so that the probe contact probe 4 and the transducer pad can realize soft contact. Assuming that the cylindrical array transducer 1 is 6 elements, the transducer structure is a 6-sided structure, so when the locking nut 9 is tightened, the 6 wedge jaws of the clutch ring 7 simultaneously press the wedge block 6, so that the 6 wedge blocks 6 can drive all the probes 4 to simultaneously separate from the pad, and one clamping can realize the measurement of 6 elements.

[0031] Of course, all the lines led out by the probes 4 also need corresponding circuit and software design, by leading out N lines of signal end and N lines of ground end, and connecting to the circuit board, and connecting to the port of the chip through circuit design, the chip has 2N signal port inputs, through the designed software to control the chip port to be conductive, so that only 2 corresponding signal ports are output, that is, the signal and ground of the corresponding element of the measured transducer, and the output port is used to connect the test equipment and instrument to test. When the software collects the measurement value of the test equipment at the beginning of the test, it automatically jumps to the next element measurement after waiting for a set time, until all elements are measured, and the test data and quality report are summarized, to realize the automatic test of the electrical and acoustic performance of the transducer.

[0032] It should be noted that in this text, relational terms such as first and second are used only to distinguish one entity or operation from another, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the terms "include", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or inherent to such process, method, article or equipment.

[0033] Although the embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A medical transducer test fixture, characterized by: Including positioning axis, the positioning axis is composed of big cylinder and small cylinder, the big cylinder end of the positioning axis places cylinder array transducer, the outer side of the positioning axis is fixedly connected with fixed plate, the fixed plate is fixedly connected with support ring away from the one end of the positioning axis, the support ring is equipped with the clamping assembly of the inside cylinder array transducer of the positioning axis between clamping and is held, The small cylinder end of the positioning axis is slidably connected with the clutch ring, the clutch ring is equipped with the adjusting assembly of adjusting the clamping force of the clamping assembly, The inner wall of the positioning axis is slidably connected with the mandrel, the mandrel is designed as a regular polygon rod, and the number of edges is the same as the number of array elements of the transducer, The big cylinder end of the positioning axis is uniformly distributed with punching on the circumference, the clamping assembly includes a plurality of thimbles, a plurality of the thimbles are one-to-one corresponding with the holes on the surface of the positioning axis, and the thimbles are slidably connected with the holes on the surface of the positioning axis, the thimbles are externally provided with spring one, one end of the spring one is fixedly connected with the inner wall of the clutch ring, the other end of the spring one is fixedly connected with the thimble, the thimble is fixedly connected with the wedge block away from the one end of the positioning axis, and a plurality of the wedge blocks are equidistantly distributed on the outer side of the clutch ring.

2. The medical transducer test fixture of claim 1, wherein: The outer circle of the fixed plate has two lugs matched with the two grooves of the inner wall of the clutch ring, and the clutch ring slides axially along the lugs on the fixed plate.

3. The medical transducer test fixture of claim 1, wherein: The diameter of the one end of the thimble close to the positioning axis is smaller than the diameter of the one end away from the positioning axis.

4. The medical transducer test fixture of claim 1, wherein: The adjusting assembly includes a locking nut located on the outer side of the clutch ring away from the wedge block, the locking nut is in abutment with the clutch ring, the locking nut is threadedly connected with the surface of the positioning axis, and the clutch ring is provided with a beveled sliding groove matched with the wedge block at the one end close to the wedge block.

5. The medical transducer test fixture of claim 1, wherein: The outer side of the positioning axis is provided with spring two, one end of the spring two is fixed with the fixed plate, and the other end of the spring two is fixed with the clutch ring.

6. The medical transducer test fixture of claim 1, wherein: The surface of the thimble is provided with a mesa, and the mesa of the thimble supports spring one.

7. The medical transducer test fixture of claim 1, wherein: A plurality of the thimbles are distributed in a circumferential arrangement.

8. The medical transducer test fixture of claim 2, wherein: The wedge block is provided with a hole, and the one end of the thimble close to the wedge block is matched with the hole.

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