CN209154914U - A kind of compound bifocus focused transducer - Google Patents
A kind of compound bifocus focused transducer Download PDFInfo
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- CN209154914U CN209154914U CN201821335503.4U CN201821335503U CN209154914U CN 209154914 U CN209154914 U CN 209154914U CN 201821335503 U CN201821335503 U CN 201821335503U CN 209154914 U CN209154914 U CN 209154914U
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- transducer
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- energy converter
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- far field
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Abstract
The utility model discloses a kind of compound bifocus focused transducers, belong to the field of medical instrument technology.It includes sequentially connected position control, focus controlling device, near field transducer and far field energy converter from top to bottom, and far field energy converter is fixed on the lower section of focus controlling device.The utility model is worked at the same time by bifocal, and single level single pass can be completed, to cover the entire boundary of oncotherapy level, shortens treatment time, improves therapeutic efficiency.
Description
Technical field
The utility model belongs to the device of the field of medical instrument technology, is related to high-strength focusing ultrasonic therapy, especially relates to
And a kind of compound bifocus focused transducer.
Background technique
Nowadays, ultrasonic technique has been used in every field, plays greatly effect.Focusing ultrasonic technique has
Very strong penetrability and directive property have been widely applied in the treatment of the entity tumors such as fibroid, and obtain good control
Therapeutic effect.But current focus ultrasonic technology still has some shortcomings, such as existing high intensity focused ultrasound technology master
If being treated with a ultrasound focus, treatment mode generally by point at line to line line at face, then by line line at
Face covers full tumour to the form of face face adult, is treated finally by solid ablation method.It is swollen for bigger entity
Tumor, points in need for the treatment of are very more, so that treatment time is long, it generally will be at one or two hour or more, to doctor and trouble
It is all very big burden for person.
China Patent Publication No.: the patent document of CN1593688A publication date 2005.03.16 discloses a kind of for treating
The multifocal ultra-sonic transducer of tumour, it is made of a variety of focal length components around same center of circle arranged for interval, each
Component is made of 2-4 piece concave sphere self focusing piezoelectric ceramic piece respectively, and symmetrical on circular conical surface, respective focus converges in
Multiple focuses are formed in common axis.The utility model, can be in a short period of time compared with single-focusing ultrasonic transducer
Therapeutic process is completed, and in different situations, can individually open different focal length groups, adapt to different needs, can mention
High therapeutic effect.But the technical solution of the utility model is disadvantageous in that: the focus of ultra-sonic transducer
It constituting complex, is not easy to repair inspection, while the ultra-sonic transducer is complicated for operation, the volume of entity tumor is bigger,
The step of number of focus is more, operation are more complicated, are unfavorable for being used for a long time；Simultaneously in the technical solution of the utility model
The distance between multiple focuses are fixed and invariable, and cannot be adjusted, and are difficult disposably to be selected according to the size of tumour and boundary
It selects suitable focus number and meets the needs for the treatment of.
Therefore, the injury of tumour bring how can be eliminated, while treatment time, easy to operate, mitigation can also be reduced
The burden of doctor and patient be in the prior art urgent need to resolve the technical issues of.
Utility model content
1, it to solve the problems, such as
The problem of eliminating of long duration, low efficiency to tumour existing in the prior art, the utility model provide a kind of compound
Type bifocus focused transducer.The utility model is worked at the same time by bifocal, and single level single pass can be complete
At, so that the entire boundary of oncotherapy level is covered, and it is easy to operate, treatment time is shortened, therapeutic efficiency is improved.
2, technical solution
To solve the above problems, the utility model adopts the following technical scheme.
A kind of compound bifocus focused transducer, including sequentially connected position control, coke from top to bottom
Distance control apparatus, near field transducer and far field energy converter, and the far field energy converter is fixed on the lower section of focus controlling device.
Further, further include Ultrasonic-B probe, the Ultrasonic-B probe be inserted in position control, focus controlling device and
The middle of near field transducer, and the Ultrasonic-B probe is fixed with focus controlling device by fixing piece.
Further, the lower end of the near field transducer and the lower end of far field energy converter are in cambered surface, and the near field
The center of circle of energy converter and the center of circle of far field energy converter are on the central axis of position control and focus controlling device, simultaneously
The radius of the far field energy converter is equal to the radius of near field transducer.
Further, the near field transducer and far field energy converter are PZT (piezoelectric transducer).
Further, the position control includes motion motor, screw rod A and fixed plate, the movement electricity
Machine is fixed in fixed plate, and the upper end the screw rod A passes through fixed plate and connect with motion motor, and the screw rod A passes through screw rod spiral shell
Female A is connect with focus controlling device.
Further, the focus controlling device includes focusing motor, screw rod B and movable plate, the movable plate
In inverted u-shaped, and the horizontal portions parallel of the movable plate, in fixed plate and near field transducer, the focusing motor is fixed on shifting
On movable plate, the upper end the screw rod B passes through movable plate and connect with focusing motor, and screw rod B passes through feed screw nut B and near field transducer
Connection.
Further, the lower end of the fixed plate is equipped with line slide rail A, and the screw rod A and line slide rail A difference
Positioned at the both ends of fixed plate, the line slide rail A is connect with focus controlling device by rolling assembly A.
Further, the lower end of the movable plate is equipped with line slide rail B, and the screw rod B and line slide rail B difference
Positioned at the both ends of movable plate, the line slide rail B is connect by rolling assembly B near field transducer.
3, beneficial effect
Compared with the prior art, the utility model has the following beneficial effects:
(1) the utility model is provided with two kinds of energy converters of near field transducer and far field energy converter, by using different focal length
Energy converter, carry out far field focus and near field focus, and position control control near field transducer and far field energy converter respectively
The two associated movement, and focus controlling device only controls the movement of near field transducer, working principle is simple, and it is convenient and double to operate
Focus works simultaneously, so that single level single pass can be completed, and covers the entire boundary of oncotherapy level,
The points for the treatment of greatly reduce, and treatment time shortens, and therapeutic efficiency improves；
(2) Ultrasonic-B probe of the utility model is inserted in the center of position control, focus controlling device and near field transducer
Between, and Ultrasonic-B probe is fixed with focus controlling device by fixing piece, therefore near field transducer and far field energy converter are mobile same
When, Ultrasonic-B probe also moves, and during oncotherapy, near field transducer focus and far field energy transducer focus can be more
Easily it is located in the treatment level of tumour；
(3) lower end of the utility model near field transducer and the lower end of far field energy converter are all provided with and are set to cambered surface, facilitate close
The formation of field energy transducer focus and far field energy transducer focus, focus are on same axis, facilitate focusing ultrasound covering tumour
Treatment level, and the radius of far field energy converter be equal near field transducer radius, i.e., near field transducer move to extreme lower position and
When far field transducer motion is to extreme higher position, near field transducer focus and far field energy transducer focus are completely coincident, when near field transducing
Device moves to extreme higher position and when far field transducer motion is to extreme lower position, near field transducer focus and far field energy transducer focus
Distance is farthest, therefore different shape, different size of tumour can be treated；
(4) near field transducer of the utility model and far field energy converter are all made of PZT (piezoelectric transducer), the master of PZT (piezoelectric transducer)
Wanting working principle is: realizing the mutual conversion between electric energy and sound energy by piezoelectric effect, electro-acoustic conversion efficiency is high, and production side
Just, non-aging, cost is relatively low, is conducive to be used for a long time；
(5) feed screw nut of the utility model connect with screw rod, and screw rod is connected to motor, so that motor passes through control silk
The rotation of bar has driven the operating of feed screw nut, control of the motor near field transducer and far field energy converter is facilitated, so that closely
The movement of field energy converter and far field energy converter is more flexible；
(6) side of the fixing plate and moving plate of the utility model is provided with screw rod, and it is sliding that the other side is provided with straight line
Rail, screw rod are connect with feed screw nut, and line slide rail is connect with rolling assembly, so that the relative motion between device is more steady,
It is more convenient to operate.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the utility model；
Fig. 2 is the working state schematic representation of the utility model；
In figure: 1, motion motor；2, screw rod A；3, feed screw nut A；4, line slide rail A；5, near field transducer focus；6, remote
Field energy transducer focus；7, Ultrasonic-B probe；8, fixing piece；9, focusing motor；10, fixed plate；11, movable plate；12, near field transducer；
13, far field energy converter；14, line slide rail B；15, screw rod B；16, feed screw nut B.
Specific embodiment
In order to clearly describe the utility model, the utility model is described in detail with reference to the accompanying drawing.
The utility model is further described below combined with specific embodiments below.
Embodiment 1
With reference to Fig. 1, a kind of compound bifocus focused transducer, including position control, focus controlling device,
The lower end of near field transducer 12 and far field energy converter 13, position control connects focus controlling device, focus controlling device
Lower end connects near field transducer 12, and the lower end of near field transducer 12 connects far field energy converter 13；
The lower end of near field transducer 12 and far field energy converter 13 is in a kind of globoidal structure, upper end horizontal component and position control
Device is parallel with focus controlling device, while the center of circle of near field transducer 12 and the center of circle of far field energy converter 13 are in position control
On the central axis of device and focus controlling device, the radius of far field energy converter 13 is equal to the radius of near field transducer 12, and close
Field energy converter 12 and far field energy converter 13 are PZT (piezoelectric transducer).
When work, the working principle of the present apparatus is:
Position control starting, 13 setting in motion of near field transducer 12 and far field energy converter, when position control control
After near field transducer 12 and far field energy converter 13 processed move to appropriate position, 13 stop motion of far field energy converter, focus controlling
Device starting, drives near field transducer 12 to move, and adjusts the distance between near field transducer 12 and far field energy converter 13, and distance is adjusted
It is whole it is appropriate after, near field transducer 12 and far field energy converter 13 transmitting focusing ultrasound.
The position control function of the utility model is: coarse adjustment, adjusts near field transducer 12 and far field energy converter 13
Approximate location；The function of focus controlling device is: fine tuning adjusts the distance between near field transducer 12 and far field energy converter 13.
By combining for both coarse adjustment and fine tuning, the movement of near field transducer 12 and far field energy converter 13 is more flexible, focuses ultrasound
The operation of energy converter is more accurate.
Embodiment 2
What embodiment 2 designed is a kind of compound bifocus focused transducer, basic structure with embodiment 1,
The difference is that position control includes motion motor 1, screw rod A2 and fixed plate 10, motion motor 1 is fixed on fixed plate
On 10, the upper end of screw rod A2 passes through fixed plate 10 and connect with motion motor 1, while screw rod A2 passes through feed screw nut A3 and focal length
Control device connection；
Focus controlling device includes focusing motor 9, screw rod B15 and movable plate 11, and focusing motor 9 is fixed on movable plate 11
On, the upper end screw rod B15 passes through movable plate 11 and connect with focusing motor 9, while screw rod B15 passes through feed screw nut B16 and near field
Energy converter 12 connects.
When work, the working principle of the present apparatus is:
Fixed plate 10 remains stationary, and motion motor 1 starts, and screw rod A2 rotation drives feed screw nut A3 movement, feed screw nut
A3 can be moved along four direction up and down, and movable plate 11 is driven to move, thus near field transducer 12 and far field energy converter
13 move with movable plate 11, when the control near field transducer 12 of motion motor 1 and far field energy converter 13 move to appropriate position
Afterwards, 11 stop motion of movable plate, focusing motor 9 start, and screw rod B15 rotation drives feed screw nut B16 movement, feed screw nut B16
It can be moved along upper and lower both direction, drive near field transducer 12 to move, while keeping the center of circle and far field of near field transducer 12
The center of circle of energy converter 13 is in always on same axis, the distance between appropriate adjustment near field transducer 12 and far field energy converter 13
Afterwards, near field transducer 12 and far field energy converter 13 transmitting focusing ultrasound.
The present position of near field transducer 12 and far field energy converter 13 is controlled by motion motor 1, and focusing motor 9 controls near field
The distance between energy converter 12 and far field energy converter 13 are controlled by different motors, and near field transducer 12 and far field are changed
The movement position of energy device 13 can be more accurate.
Embodiment 3
What embodiment 3 designed is a kind of compound bifocus focused transducer, basic structure and above-described embodiment
It is essentially identical, the difference is that, the lower end of fixed plate 10 is equipped with line slide rail A4, and screw rod A2 and line slide rail A4 points
The both ends of fixed plate 10 are distributed in, line slide rail A4 with movable plate 11 by rolling assembly A by connecting；
The lower end of movable plate 11 is equipped with line slide rail B14, and screw rod B15 and line slide rail B14 are distributed in movable plate 11
Both ends, the line slide rail B14 connect by rolling assembly B near field transducer 12.
When work, the working principle of the present apparatus is:
Motion motor 1 starts, and screw rod A2 rotation drives feed screw nut A3 movement, and feed screw nut A3 can be along up and down four
A direction movement, while line slide rail A4 is remained stationary, and rolling assembly A is with feed screw nut A3 that four direction is transported up and down
It is dynamic, and movable plate 11 is driven to move, line slide rail B14 is moved with the movement of movable plate 11, when near field transducer 12 and far
After field energy converter 13 moves to appropriate position, 11 stop motion of movable plate, focusing motor 9 starts, and screw rod B15 rotation drives silk
Stem nut B16 movement, feed screw nut B16 can be moved along upper and lower both direction, and rolling assembly B is with feed screw nut B16 or more
Both direction movement, so that near field transducer 12 be driven to move.
Line slide rail and screw rod is arranged in the utility model, ensure that in 12 motion process of movable plate 11 and near field transducer
Stability has ensured the basic operation of device to improve the stability of device overall operation.
Embodiment 4
With reference to Fig. 2, the utility model provides a kind of application method of compound bifocus focused transducer, specifically
It says, comprising the following steps:
1) determination and analysis of knub position.In the present embodiment, Ultrasonic-B probe 7 and computer are electrically connected, Ultrasonic-B probe 7
One end and human contact, by the traversing of probe of Ultrasonic-B probe 7, computer by software for treatment show on a display screen it is swollen
The specific location of tumor assesses the size of tumour, tumour is divided into several treatment layer according to the tumour of display screen display
Face is divided into eight treatment levels herein.
2) focused transducer is from first treatment level, to the 8th treatment level, successively using same as below
Step is treated:
A) position control starts, and drives movable plate 11 to move, to drive near field transducer 12 and far field energy converter
13 movements, the leftmost side for treating level to first moves, until the center of circle, that is, far field energy transducer focus 6 of far field energy converter 13
The bottom of the level leftmost side is treated in first.
B) after far field energy converter 13 moves to appropriate position, 11 stop motion of movable plate, the starting of focus controlling device,
To drive near field transducer 12 to move, the top that near field transducer 12 treats the level leftmost side towards first is mobile, until
The center of circle of near field transducer 12, that is, near field transducer focus 5 is located at the top of first treatment level leftmost side；
C) near field transducer 12 and 13 transmitting focusing of far field energy converter ultrasound, focus focus ultrasonic near field transducer focus
5, at far field energy transducer focus 6, treat the leftmost side of first treatment level；
D) after the completion of the leftmost side treatment of first treatment level, step a and step b is repeated by near field energy transducer focus 5
It is located at the right side of first treatment level leftmost side with far field energy transducer focus 6, repeats step c, until first treatment layer
Face treatment is completed；
E) after the completion of the treatment of first treatment level, repeat step a, step b and step c by near field energy transducer focus 5 with
Far field energy transducer focus 6 is located at the leftmost side of second treatment level, treats to the leftmost side of second treatment level, then
Repeat step d.
It is worth noting that: the center of circle of near field transducer 12 and the center of circle of far field energy converter 13 are on same axis, i.e.,
Near field transducer focus 5 and far field energy transducer focus 6 are on same axis；The radius of far field energy converter 13 is equal near field transducing
The radius of device 12, that is, the focal length (distance of transducer tip to focus) of near field transducer 12 are equal to far field energy converter 13
Focal length；
When near field transducer focus 5 is overlapped with far field energy transducer focus 6, between near field transducer 12 and far field energy converter 13
Distance it is minimum, be typically in the most side for the treatment of level treatment, near field transducer 12 and far field energy converter 13 are treated together at this time
At one；Near field transducer focus 5 and far field energy transducer focus 6 apart from it is farthest when, near field transducer 12 and far field energy converter 13 it
Between distance it is maximum, be typically in treatment level the widest part, near field transducer 12 treats phase with far field energy converter 13 respectively at this time
At the treatment answered.
The focusing ultrasound of the utility model scans the appearance of tumour, will be swollen using the tissue of surface solidification necrosis
Tumor interior tissue is closed.Since external keeping is cut off, after a period of time, internal tumours cell will be gradually dead
It dies, rules by law and treated for tumour relative to solid ablation, this approach reduces treatment times.
Embodiment 5
Embodiment 5 provides a kind of application method of compound bifocus focused transducer, and basic step is the same as real
Example 4 is applied, specifically, comprising the following steps:
1) determination and analysis of knub position.In the present embodiment, Ultrasonic-B probe 7 and computer are electrically connected, Ultrasonic-B probe 7
One end and human contact, by the traversing of probe of Ultrasonic-B probe 7, computer by software for treatment show on a display screen it is swollen
The specific location of tumor assesses the size of tumour, tumour is divided into several treatment layer according to the tumour of display screen display
Face is divided into ten treatment levels herein.
2) focused transducer is from first treatment level, to the tenth treatment level, successively using same as below
Step is treated:
A) motion motor 1 starts, and screw rod A2 rotation drives feed screw nut A3 movement, and line slide rail A4 is remained stationary, and rolls
Component A is moved together with feed screw nut A3, thus drive movable plate 11 move, line slide rail B14 with movable plate 11 movement
And move, near field transducer 12 and far field energy converter 13 also move, and the rightmost side for treating level to first moves, until
The center of circle of far field energy converter 13, that is, far field energy transducer focus 6 is located at the bottom of first treatment level rightmost side.
B) after far field energy converter 13 moves to appropriate position, 11 stop motion of movable plate, focusing motor 9 starts, silk
Bar B15 rotation drives feed screw nut B16 movement, and rolling assembly B is moved with the movement of feed screw nut B16, to drive close
Field energy converter 12 moves, and the top that near field transducer 12 treats the level rightmost side towards first is mobile, until near field transducer
12 center of circle, that is, near field transducer focus 5 is located at the top of first treatment level rightmost side；
C) near field transducer 12 and 13 transmitting focusing of far field energy converter ultrasound, focus focus ultrasonic near field transducer focus
5, at far field energy transducer focus 6, treat the rightmost side of first treatment level；
D) after the completion of the rightmost side treatment of first treatment level, step a and step b is repeated by near field energy transducer focus 5
It is located at the left side of first treatment level rightmost side with far field energy transducer focus 6, repeats step c, until first treatment layer
Face treatment is completed；
E) after the completion of the treatment of first treatment level, repeat step a, step b and step c by near field energy transducer focus 5 with
Far field energy transducer focus 6 is located at the rightmost side of second treatment level, treats to the rightmost side of second treatment level, then
Repeat step d.
Embodiment 6
Embodiment 6 provides a kind of application method of compound bifocus focused transducer, and basic step is the same as real
Example 4 is applied, specifically, comprising the following steps:
1) determination and analysis of knub position.In the present embodiment, Ultrasonic-B probe 7 and computer are electrically connected, Ultrasonic-B probe 7
One end and human contact, by the traversing of probe of Ultrasonic-B probe 7, computer by software for treatment show on a display screen it is swollen
The specific location of tumor assesses the size of tumour, tumour is divided into several treatment layer according to the tumour of display screen display
Face is divided into 15 treatment levels herein.
2) focused transducer is from first treatment level, to the 15th treatment level, successively using same as below
The step of treated:
A) motion motor 1 starts, and screw rod A2 rotation drives feed screw nut A3 movement, and line slide rail A4 is remained stationary, and rolls
Component A is moved together with feed screw nut A3, thus drive movable plate 11 move, line slide rail B14 with movable plate 11 movement
And move, near field transducer 12 and far field energy converter 13 also move, and the intermediary movements of level are treated to first, until remote
The center of circle, that is, far field energy transducer focus 6 of field energy converter 13 is located at the bottom among first treatment level.
B) after far field energy converter 13 moves to appropriate position, 11 stop motion of movable plate, focusing motor 9 starts, silk
Bar B15 rotation drives feed screw nut B16 movement, and rolling assembly B is moved with the movement of feed screw nut B16, to drive close
Field energy converter 12 moves, and near field transducer 12 is mobile towards the top among first treatment level, until near field transducer 12
The center of circle, that is, near field transducer focus 5 be located at the top among first treatment level；
C) near field transducer 12 and 13 transmitting focusing of far field energy converter ultrasound, focus focus ultrasonic near field transducer focus
5, at far field energy transducer focus 6, treat the centre of first treatment level；
D) first treatment level mid-treatment after the completion of, repeat step a and step b by near field energy transducer focus 5 with
Far field energy transducer focus 6 is located at the left or right side among first treatment level, repeats step c, until first treatment
Level treatment is completed；
E) after the completion of the treatment of first treatment level, repeat step a, step b and step c by near field energy transducer focus 5 with
Far field energy transducer focus 6 is located at the centre of second treatment level, treats, repeats to the centre of second treatment level
Step d, until completing 15 treatment levels.
Schematically the utility model is created above and embodiments thereof are described, description is not limiting,
Shown in the drawings is also one of the embodiment that the utility model is created, and actual structure is not limited to this.So such as
Those of ordinary skill in the art are inspired by it for fruit, in the case where not departing from this creation objective, not inventively designs
Frame mode similar with the technical solution and embodiment, should belong to the protection scope of this patent.
Claims (8)
1. a kind of compound bifocus focused transducer, which is characterized in that including sequentially connected position control from top to bottom
Device, focus controlling device, near field transducer (12) and far field energy converter (13) processed, and the far field energy converter (13) is fixed on
The lower section of focus controlling device.
2. a kind of compound bifocus focused transducer according to claim 1, which is characterized in that further include Ultrasonic-B probe
(7), the Ultrasonic-B probe (7) is inserted in the middle of position control, focus controlling device and near field transducer (12), and
The Ultrasonic-B probe (7) and focus controlling device are fixed by fixing piece (8).
3. a kind of compound bifocus focused transducer according to claim 1, which is characterized in that the near field transducer
(12) lower end of lower end and far field energy converter (13) is in cambered surface, and the center of circle of the near field transducer (12) and far field transducing
The center of circle of device (13) is on the central axis of position control and focus controlling device, while the far field energy converter (13)
Radius be equal near field transducer (12) radius.
4. a kind of compound bifocus focused transducer according to claim 1, which is characterized in that the near field transducer
(12) and far field energy converter (13) is PZT (piezoelectric transducer).
5. a kind of compound bifocus focused transducer according to claim 1, which is characterized in that the position control
Device includes motion motor (1), screw rod A (2) and fixed plate (10), and the motion motor (1) is fixed on fixed plate (10),
(2) upper end screw rod A passes through fixed plate (10) and connect with motion motor (1), and the screw rod A (2) passes through feed screw nut A
(3) it is connect with focus controlling device.
6. a kind of compound bifocus focused transducer according to claim 5, which is characterized in that the focus controlling
Device includes focusing motor (9), screw rod B (15) and movable plate (11), and the movable plate (11) is in inverted u-shaped, and the shifting
The horizontal portions parallel of movable plate (11) is fixed on movement in fixed plate (10) and near field transducer (12), the focusing motor (9)
On plate (11), (15) upper end screw rod B passes through movable plate (11) and connect with focusing motor (9), and screw rod B (15) passes through screw rod
Nut B (16) is connect near field transducer (12).
7. a kind of compound bifocus focused transducer according to claim 5, which is characterized in that the fixed plate (10)
Lower end be equipped with line slide rail A (4), and the screw rod A (2) and line slide rail A (4) are located at the two of fixed plate (10)
End, the line slide rail A (4) are connect with focus controlling device by rolling assembly A.
8. a kind of compound bifocus focused transducer according to claim 6, which is characterized in that the movable plate (11)
Lower end be equipped with line slide rail B (14), and the screw rod B (15) and line slide rail B (14) are located at movable plate (11)
Both ends, the line slide rail B (14) are connect by rolling assembly B near field transducer (12).
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| CN201821335503.4U CN209154914U (en) | 2018-08-20 | 2018-08-20 | A kind of compound bifocus focused transducer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108939327A (en) * | 2018-08-20 | 2018-12-07 | 安徽声达愈医疗器械有限公司 | A kind of compound bifocus focused transducer and application method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108939327A (en) * | 2018-08-20 | 2018-12-07 | 安徽声达愈医疗器械有限公司 | A kind of compound bifocus focused transducer and application method |
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