Shock-wave medical treatment apparatus

Abstract: A control processing device (20) moves an X-/Y-/Z-axis movement mechanism (12), a first rotation mechanism (8), and a second rotation mechanism (9). Consequently, a shock-wave oscillating device (3) is moved in X-, Y- and Z-directions, so that the direction of radiation of shock waves can be changed while the focal point of the shock waves is being set at a target of treatment.

Description: The present invention relates to a shock-wave medical treatment apparatus for destroying, for example, a kidney stone or a gallstone in a subject, by using shock waves. In a shock-wave medical treatment apparatus, shock waves emitted from a shock-wave oscillator section is focused on a target of treatment in a subject, for example, a kidney stone or a gallstone. The shock waves are sent to destroy the kidney stone, or the like. The direction of radiation of shock waves is sometimes changed by moving the shock-wave oscillator section, after the focal point of shock waves has been set. A target of treatment differs from subject to subject. Thus, if the direction of radiation of shock waves is changed, the focal point of shock waves is displaced from the target. EP-A-0264738 discloses a lithotripsy work station having a patient support table and an adjustable mounting arrangement for the shockwave generator positioning the shockwave generator directly above the patient supporting table. The shockwave generator can be mounted by a holder which rotates around a vertical axis above the patient supporting table so that a longitudinal axis of the generator can be aligned to intersect with the vertical axis roughly through the center of the patient supporting table. The mounting means can also be a separate holder which is movable in a horizontal direction that is secured to a ceiling in the room or is on a unit movable on the floor. In each of the embodiments, the shockwave generator can be mounted by an adjustable mechanism that allows changing the angle between the vertical axis and the longitudinal axis of the generator. The Proceedings of the First International Symposium on Biliary Lithotripsy which took place in July 1988 disclose in the article at pages 253-263 a patient-handling system designed to afford the physician virtually unlimited lithotripsy treatment options. The patient table has longitudinal and transverse travel capabilities, as well as height, head up/head down angulation and side-to-side tilt. The longitudinal and transverse movements are used to move the target into position. Table tilt and angulation are designed to allow the physician to compensate for anatomical variations and present the target in an optimum treatment position. An object of the present invention is to provide a shock-wave medical treatment apparatus, wherein after the focal point of shock waves has been initially set, the direction of radiation of shock waves can be easily changed, while the focal point is being fixed at a target of treatment which differs from subject to subject. According to the present invention, there is provided a shock-wave medical treatment apparatus comprising: shock-wave oscillating means for emitting focused shock waves; X-/Y-/Z-axis movement means for moving said shock-wave oscillating means in X-, Y-, and Z-directions; L-shaped or curved first rotation means, attached to an end portion of said X-/Y-/Z-axis movement means, for rotating said shock-wave oscillating means using the Y-axis as a rotating axis; second rotation means, attached to an end portion of said L-shaped or curved first rotation means, for rotating said shock wave oscillating means using the X-axis as a rotating axis; a movement adjustment mechanism, interposed between said second rotation means and said shock-wave oscillating means, said movement adjustment mechanism being rotated by said second rotation means and operable to move said shock-wave oscillating means in the direction of radiation of the shock-waves; and control processing means for controlling the driving of said X-/Y-/Z- axis movement means, said L-shaped or curved first rotation means, said second rotation means, and said movement adjustment mechanism while maintaining the focal point of the shock-wave oscillating means at the target, said control processing means including: calculation means for obtaining respective moving distances of said X-/Y-/Z-axis movement means, said L-shaped or curved first rotation means, said second rotation means, and said movement adjustment mechanism, based on differences, before and after movement to desired positions, in the X-Y position and the angle of said shock-wave oscillating means, and in the position of said movement adjustment mechanism; first driving means for driving said X-/Y-/Z- axis movement means in the X-Y plane, and for simultaneously driving said first and second rotation means by sending respective movement control signals in accordance with the moving distances obtained by said calculating means; and second driving means for driving said movement adjustment mechanism by sending movement control signals in accordance with the moving distances obtained by said calculating means, to thereby move said shock-wave oscillating means in the direction of radiation of the shock waves. According to the invention, the control processing device moves the X-/Y-/Z-axis movement mechanism, the first rotation mechanism, and the second rotation mechanism. Consequently, the shock-wave oscillating device is moved in X-, Y- and Z-directions, so that the direction of radiation of shock waves can be changed while the focal point of the shock waves is being set at a target of treatment. This invention can be more fully understood from the following detailed description when taken in conjunction with the accompanying drawings, in which: Fig. 1 shows a structure of a shock-wave medical treatment apparatus according to an embodiment of the present invention; Fig. 2 shows a structure of a shock-wave oscillator section; Fig. 3 shows the shock-wave oscillator section in the case where the direction of radiation of shock waves is changed; Fig. 4 shows the shock-wave oscillator section in the case where the position of the shock-wave oscillator section set in parallel to the Z-axis is changed so that the direction of radiation of shock waves is changed; Fig. 5 illustrates positional errors of the shock-wave oscillator section when it is moved; Fig. 6 shows comparative data relating to positional errors of the shock-wave oscillator section when it is moved; and Fig. 7 shows an appearance of a curved arm, used in place of an L-shaped arm. Fig. 1 shows a structure of a shock-wave medical treatment apparatus according to an embodiment of the present invention. In Fig. 1, an X-/Y-/Z-axis movement mechanism 2 is arranged adjacent to a bed 1. The X-/Y-/Z-axis movement mechanism 2 serves to move a shock-wave oscillator section 3 for radiating shock waves in the X-, Y-, an Z-directions. The movement mechanism 2 has a frame 4. The frame 4 has, in its mutually facing inner faces, guide grooves 5 extending in the Z-direction. A first arm 6 is slidably set in the guide grooves 5. A second arm 7 is slidably attached to the first arm 6 in the X- and Y-directions. An L-shaped arm 8, serving as a first rotation mechanism, is attached to one end of the second arm 7. The L-shaped arm 8 is rotatable in the β-direction, in relation to the second arm 7. The β-direction describes a circle in a plane perpendicular to the Y-direction. The other end of the L-shaped arm 8 is provided with a movement adjustment mechanism 9 via a second rotation mechanism. The mechanism 9 is connected to the shock-wave oscillator section 3. The mechanism 9 is rotatable in the α-direction in relation to the L-shaped arm 8. The α-direction describes a circle in a plane perpendicular to the X-direction. Fig. 2 shows a structure of the shock-wave oscillator section 3. A bellows 10 is connected, at one end, to a shock-wave oscillator 11, and, at the other end, to a rubber water bag 12. A closed chamber defined by the bellows 10, shock-wave oscillator 11 and water bag 12 is filled with water 13. Also, the a probe 14 of an ultrasonic diagnostic apparatus is inserted into the closed chamber. A control processor 20 supplies movement control signals to the X-/Y-/Z-axis movement mechanism 2, the L-shaped arm 8 and the mechanism 9, respectively. The control processor 20 receives a detection signal from the probe 14 and causes a display 21 to display a corresponding image. Each movement control signal is obtained on the basis of the amount of movement in the X-, Y-, and Z-axis directions. A mechanism comprising the X-/Y-/Z-axis movement mechanism 2, the L-shaped arm 8 and the mechanism 9 has six degrees of freedom, four of these being X, Y, Z1, Z2 (linear movement), and the other two being α and β (rotational movement). The degree of freedom Z1 corresponds to the Z-axis of the X-/Y-/Z-axis movement mechanism 2, and the degree of freedom Z2 corresponds to the movement axis of the mechanism 9. The focal point (destruction point) P of shock waves radiated from the shock-wave oscillator section 3 can be found by solving the coordinate transformation matrix of the degrees of freedom of linear movement, X, Y, Z1 and Z2, and the degrees of freedom of rotational movement, α and β. Namely, the focal point P is given by the following equation: The focal point P, obtained by the above equation, is represented by (Px1, Py1, Pz1). When the direction of radiation of shock waves is changed in this state, the focal point P is represented by (Px2, Py2, Pz2). When it is considered that the direction of radiation of shock waves is changed without changing the focal point, the following relationship is established: From this relationship and equation (1), the following equations are obtained: X₁-Z2₁·sinβ₁·cosα₁ =X₂-Z2₂·sinβ₂·cosα₂ (2) Y₁+Z2₁·sinα₁ =Y₂+Z2₂·sinα₂ (3) Z1₁-Z2₁·cosβ₁·cosα₁=Z1₂-Z2₂·cosβ₂·cosα₂ (4) In the above equations, X1 and Y1 indicate the position of the shock-wave oscillator section 3 before movement, α1 and β1 denote angles of the shock-wave oscillator section 3, and Z2₁ denotes the position of the mechanism 9. Also, X2 and Y2 represent the position of the shock-wave oscillator section 3 after the movement, α2 and β2 indicate the angles of the shock-wave oscillator section 3 at this time, and Z2₂ indicates the position of the mechanism 9 after the movement. The shock-wave oscillator section 3 is moved in the Z-direction while the water bag 12 is being in contact with the subject. In this case, the the shock-wave oscillator section 3 is moved in the Z-direction by the operation of the mechanism 9, and at this time the first arm 6 is fixed in the Z-direction. The movement of the first arm 6 in the Z-direction is fixed, since the degree of freedom in the Z-direction is unnecessarily great because of Z1 and Z2. In the equation (4), the relationship between Z1₁ and Z1₂ is represented by: Z1₁ = Z1₂ Thus, the equation (4) is developed as follows: Z2₂ = Z2₁ · cosα₁ · cosβ₁ ÷ (cosα₂ · cosβ₂) (5) As can be seen from the equation (5), in order to exactly adjust the focal point P, it is necessary to vary the value Z2. If equation (2) is substituted in equation (5), the amount of movement ΔX is given by: ΔX = Z2₁ · cosα₁ · sinΔβ ÷ cosβ₂ (6) where ΔX = X2 - X1 Δβ = β2 - β1 Similarly, if equation (5) is substituted in equation (3), the amount of movement ΔY is given by: ΔY = -Z2₁ · -sinα₁ - Z2₁ (cosα1 cosβ1/cosα2 cosβ2) × sinα₂ (7) where ΔY = Y2 - Y1 From equation (5), Z2 is given by: ΔZ2 = Z2₁ (cosα1 cosβ1/cosα2 cosβ2) - Z2₁ (8) where ΔZ2 = Z2₂ - Z2₁ The control processor 20 calculates the amount of movements ΔX, ΔY and ΔZ2, from equations (6) and (8), and, based on the calculated values, supplies movement control signals to the X-/Y-/Z-axis movement mechanism 2 and the mechanism 9. The operation of the apparatus having the above structure will now be described. First, a patient or a subject lies on the bed 1. Then, the control processor 20 sends movement control signals to the X-/Y-/Z-axis movement mechanism 2. Upon actuation of the movement mechanism 2, the shock-wave oscillator section 3 is lowered. Once the water bag 12 of the shock-wave oscillator section 3 is brought into contact with the subject, the control processor 20 stops the lowering of the X-/Y-/Z-axis movement mechanism 2 and starts to operate the probe 14. The probe 14 scans the interior of the subject, and outputs a detection signal. The detection signal is sent to the control processor 20. The control processor 20 converts the detection signal to an image, and enables the display 21 to display the image. The control processor 20 supplies the movement control signals to the X-/Y-/Z-axis movement mechanism 2 constantly, thereby keeping the display 21 displaying the interior of the subject. The shock-wave oscillator section 3 is moved in the X-, Y-, and Z-directions by the operation of the X-/Y-/Z-axis movement mechanism. While the shock-wave oscillator section 3 is being moved, the image obtained through the probe 14 is displayed on the display 21. When a target 30 of treatment - for example, a kidney stone - is displayed on the display 21 in this manner, the focal point P of the shock-wave oscillator section 3 is set to the position of the kidney stone. In this case, the position of the shock-wave oscillator section 3 is adjusted in the α- and β-directions in order for shock-waves not to adversely affect other bodily parts, such as ribs. A description will now be given of the case where the shock-wave oscillator section 3 is moved from position A to position B. In position A, shock waves are radiated at an angle α1, and in position B, shock waves are radiated at an angle α2. The control processor 20 supplies the X-/Y-/Z-axis movement mechanism 2 with movement control signals corresponding to the amounts of movement ΔX, ΔY and ΔZ2. The movement mechanism 2 moves the shock-wave oscillator section 3 in the X-/Y-direction and rotates the shock-wave oscillator section 3 in the α-direction. Simultaneously, the mechanism 9 moves in the Z2-direction, thereby setting the focal point P of the shock-wave oscillator section 3 at the target 30. The positioning between the focal point P of the shock-wave oscillator section 3 and the target 30 may be carried out in the following manner. First, the shock-wave oscillator section 3 is moved in the X-/Y-direction, and is rotated in the α-direction by the L-shaped arm 8. Then, the mechanism 9 is moved in the Z2-direction to set the focal point P of the shock-wave oscillator section 3 at the target 30. At this time, despite the movement of the shock-wave oscillator 3, the the target 30 is made to remain in the visual field of the probe 14. The probe 14, during movement, detects the target 30. Thus, in the ultrasonic diagnostic apparatus, the target 30 is not lost. When the local point P of the shock-wave oscillator section 3 is set at the target 30 in position B, the shock-wave oscillator section 3 sends shock waves through the kidney stone in such a direction that no influence is exerted on the ribs. As has been described above, in the first embodiment, the shock-wave oscillator section 3 is moved in the X-, Y- and Z-directions by the X-/Y-/Z-axis movement mechanism 2. Then, the shock-wave oscillator section 3 is rotated in the α- and β-directions by the L-shaped arm 8 and the mechanism 9. With the operation of the mechanism 9, the distance Z2 between the subject and the shock-wave oscillator section 3 is adjusted. Thus, even if the direction of radiation of shock waves is changed in accordance with the movement of the shock-wave oscillator section 3, the focal point P of shock waves is made to remain on the target 30. Though a slender patient and a stout patient have different positions of target 30, the focal point P of the shock-wave oscillator section 32 can be easily and exactly set at the target 30 in various directions. In addition, the structure of the mechanism for moving the shock-wave oscillator section 3, which is constituted by the X-/Y-/Z-axis movement mechanism 2, L-shaped arm 8 and mechanism 9, is very simple. The shock-wave oscillator section 3 may be moved by means of a single joystick (two-axis type). In this case, the amounts of movement Δα and Δβ are input to the control processor 20 by means of the joystick. The control processor 20 executes arithmetic operations of equations (6) to (8), on the basis of the amounts of movement Δα and Δβ, and finds the amounts of movement ΔX, ΔY and ΔZ2. In this way, with the use of the joystick, the shock-wave oscillator section 3 can change its direction of radiation of shock waves, while keeping the focal point at the target. A second embodiment of the present invention will now be described. Fig. 4 shows the initial state of the shock-wave oscillator section 3 whose main axis 3z is set in parallel to the Z-direction. When the direction radiation is changed, the control processor 20 calculates the following amounts of movement, from equation (1): When the α- and β-directions are changed without changing the focal point P, the amounts of movement X, Y and Z2 are found by substituting the following in equation (9): (Px, Py, Pz) T = (0, 0, -Z2) T Namely, equation (9) is developed as follows: X = Z2 · sinβ · cosα Y = -Z2 · sinα Z2 = Z1/(cosα · cosβ - 1) (10) Thus, when the shock-wave oscillator section 3 is rotated by given angles in the α and β directions, without changing the focal point P, the control processor 20 outputs the movement control signals to the X-/Y-/Z-axis movement mechanism in accordance with the amounts of movement X, Y and Z2. By virtue of the structure of control processor 20, the shock-wave oscillator section 3 can be easily moved, in particular, when the direction of radiation of shock waves is changed from the state wherein the shock-wave oscillator section 3 is set in parallel to the X-direction. In addition, in this second embodiment, like in the first embodiment, the amounts of movement Δα and Δβ may be input to the control processor 20 by means of a joystick, thereby changing the direction of shock waves radiated from the shock-wave oscillator section 3. A third embodiment of the present invention will now be described. The apparatus according to the third embodiment has a simpler control function. In this case, the shock-wave oscillator section 3 moves very slightly. When the shock-wave oscillator section 3 is moved slightly from a given position (α1, β1, Z2₁) by a degree represented by: cosΔα = 1, cosΔβ = 1, sinΔα = Δα, sinΔβ = Δβ, the following equations can be obtained by approximation of equations (6) to (8): ΔX = Z2₁ (cosα1/cosβ1) · Δβ (11) ΔY = -Z2₁ (1/cosα1) · Δα (12) ΔZ2 = Z2₁ (Δα · tanα1 + Δβ · tanβ1) (13) These equations indicate that, if values determined by a given position are considered to be proportion constants, the values ΔX, ΔY, ΔZ2, Δα, and Δβ have a linear relationship. Supposing these proportion constants are A, B, C and D, equations (11) to (13) are developed as follows: ΔX = A · Δβ (14) ΔY = B · Δα (15) ΔZ2 = C · Δβ + D · Δα (16) From equations (14) to (16), the amounts of movement ΔX, ΔY and ΔZ2 can be found by simple proportional calculations. The movement control signals corresponding to ΔX, ΔY and ΔZ2 are sent to the X-/Y-/Z-axis movement mechanism 2 and mechanism 9. As described above, in the third embodiment, the control processor 20 has a control function using simple proportional calculations based on a trigonometric function. Thus, when the shock-wave oscillator section 3 is moved slightly, the amounts of movement ΔX, ΔY and ΔZ2 are calculated by a simple process, and the corresponding movement control signals can be output. Namely, the structure of the control processor 20 is simplified. If the amounts of movement in a unit time are considered, the speeds X ˙, Y ˙, X ˙, Z ˙2, α ˙, and β ˙ corresponding to the amounts of movement are given by: X = A · β (17) Y = B · α (18) Z 2 = C · β + D · α (19) Thus, the operation of the control processor 20 can be related to the speed control. In addition, in this third embodiment, like in the first embodiment, the amounts of movement Δα and Δβ may be input to the control processor 20 by means of a joystick, thereby changing the direction of shock waves radiated from the shock-wave oscillator section 3. A fourth embodiment of the present invention will now be described. In the fourth embodiment, the shock-wave oscillator section 3 is moved from the position where the oscillator section 3 is set in parallel to the Z-direction. In this case, the shock-wave oscillator section 3 is hardly rotated in the α- or β-direction, and is slightly moved in the X-, Y- and Z-directions. In this case, α, β ≃ 0 ∵ cosα = 1 sinβ = β If this relationship is substituted in equation (9), the following equation is obtained: In order to emit shock waves at given angles α and β, without changing the focal point P of the shock-wave oscillating section 3, the following is given: (Px, Py, Pz) T = (0, 0, -Z2) T From this, the amounts of movements x′, y′ and z′ in the respective directions are given by equation 21: x′ = Z2 · β y′ = -Z2 · α z′ = 0 Thus, the control processor 20 outputs movement control signals for moving the shock-wave oscillator section 3 in the X- and Y-directions by the amounts of movement x′, y′ and z′, thereby radiating shock waves to the target at angles α and β. Therefore, even when the shock-wave oscillator section 3 is hardly rotated in the α- or β-direction, the same effects as the above embodiments can be obtained. A fifth embodiment of the present invention will now be described. In the fifth embodiment, the amounts of movement ΔX, ΔY and ΔZ calculated by the control processor 20 are expressed by adding constants F, G, H and I to equations (14) to (16): ΔX = (A + F) · Δβ (22) ΔY = (B + G) · Δα (23) ΔZ2 = (C + H) · Δβ + (D + I) · Δα (24) For example, as shown in Fig. 5, the shock-wave oscillator section 3 is initially set in position X0. At this time, the focal point Ps coincides with the target. From this state, in order to change the direction of radiation of shock waves, the shock-wave oscillator section 3 rotates about the β-axis by an angle Δβ1. At this time, the shock-wave oscillator section 3 receives from the control processor 20 a movement control signal representative of the amount of movement: ΔX1 = (A + F) · Δβ1 Thus, the shock-wave oscillator section 3 moves in the X-direction by ΔX1. Simultaneously, the shock-wave oscillator section 3 is moved by the mechanism 9 in an M-direction by the amount of degree represented ΔZ2₁ = (C + H) · Δβ1 + (D + I) · Δα1 At this time, the focal point is Ps1, and there occurs an error of Xp1 in the X-direction. In other words, while the shock-wave oscillator section 3 rotates in the β-direction by Δβ2, the error in the X-direction increases from O to xp1. When the shock-wave oscillator section 3 rotates by Δβ2, the control processor 20 outputs to the X-/Y-/Z-axis movement mechanism 2 the movement control signal representative of the amount of movement given by: ΔX2 = (A + F) · Δβ2 Thus, the shock-wave oscillator section 3 is moved by the movement mechanism 2 by ΔX2. Simultaneously, the shock-wave oscillator section 3 is moved by the mechanism 9 in an M-direction by the amount of degree represented by: ΔZ2₂ = (C + H) · Δβ2 + (D + I) · Δα2 At this time, the focal point is Ps2, and there occurs no error in the X-direction. In other words, while the shock-wave oscillator section 3 rotates in the β-direction from Δβ1 to Δβ2, the error in the X-direction decreases from xp1 to 0. Further, when the shock-wave oscillator section 3 rotates by Δβ3, the control processor 20 outputs to the X-/Y-/Z-axis movement mechanism 2 the movement control signal representative of the amount of movement given by: ΔX3 = (A + F) · Δβ3 Thus, the shock-wave oscillator section 3 is moved by the movement mechanism 2 by ΔX3. Simultaneously, the shock-wave oscillator section 3 is moved by the mechanism 9 in the ΔZ2-direction, i.e., in an M-direction of the movement mechanism 38 by the amount of degree represented by: ΔZ2₃ = (C + H) · Δβ3 + (D + I) · Δα3 At this time, the focal point is Ps3, and the error in the X-direction increases from 0 to xp2. However, the direction of the error is opposite, compared to the case of ΔX1. As stated above, the error due to the trigonometric approximation occurs in both positive and negative directions with respect to the target of medical treatment. If the value F is suitably set, the absolute value of the error is made constant. Namely, with respect to the rotation of ±Δβ3 can be limited to ±xp1. Fig. 6 shows the errors in the X-direction in the case where the shock-wave oscillator section is rotated by ±25° in the β-direction in the first embodiment and the fifth embodiment. As shown in Fig. 6, when the rotation is slight (about 0°), the first embodiment is more effective. However, when the rotation is great, the fifth embodiment is more effective and the error can be reduced over a wider range of angle. The present invention is not limited to the above-described embodiments, and various modifications may be made to the invention within the scope of the subject matter of the invention. For example, the L-shaped arm 37 may be replaced with a curved arm as shown in Fig. 7.

Claims: A shock-wave medical treatment apparatus comprising: shock-wave oscillating means (3) for emitting focused shock waves at a fixed target; X-/Y-/Z-axis movement means (2) for moving said shock-wave oscillating means (3) in X-, Y-, and Z-directions; L-shaped or curved first rotation means (8), attached to an end portion of said X-/Y-/Z-axis movement means (2), for rotating said shock-wave oscillating means (3) using the Y-axis as a rotating axis; second rotation means, attached to an end portion of said L-shaped or curved first rotation means (8), for rotating said shock wave oscillating means (3) using the X-axis as a rotating axis; a movement adjustment mechanism (9), interposed between said second rotation means and said shock-wave oscillating means (3), said movement adjustment mechanism being rotated by said second rotation means and operable to move said shock-wave oscillating means (3) in the direction of radiation of the shock-waves; and control processing means (20) for controlling the driving of said X-/Y-/Z- axis movement means (2), said L-shaped or curved first rotation means (8), said second rotation means, and said movement adjustment mechanism (9) while maintaining the focal point of the shock-wave oscillating means at the target, said control processing means (20) including: calculation means for obtaining respective moving distances of said X-/Y-/Z-axis movement means (2), said L-shaped or curved first rotation means (8), said second rotation means, and said movement adjustment mechanism (9), based on differences, before and after movement to desired positions, in the X-Y position and the angle of said shock-wave oscillating means (3), and in the position of said movement adjustment mechanism (9); first driving means for driving said X-/Y-/Z- axis movement means (2) in the X-Y plane, and for simultaneously driving said first and second rotation means by sending respective movement control signals in accordance with the moving distances obtained by said calculating means; and second driving means for driving said movement adjustment mechanism (9) by sending movement control signals in accordance with the moving distances obtained by said calculating means, to thereby move said shock-wave oscillating means (3) in the direction of radiation of the shock waves. A shock-wave medical treatment apparatus according to claim 1, wherein said control processing means (20), when slightly moved, determines respective moving distances of said X-/Y-/Z- movement means, said first rotation mean, said second rotation means, and said movement adjustment mechanism (9), based on the differences, before and after the movement, in the X-Y position and the angle of said shock wave oscillating means (3), and in the position of said movement adjustment mechanism (9), by multiplying a constant with the difference between the angle before and after the movement. A shock-wave medical treatment apparatus according to claim 1, wherein said control processing means (20), when slightly moved, determines the moving distances of said X-/Y-/Z- moving means, said first rotation means, said second rotation means, and said movement adjustment mechanism (9), based on the differences, before and after the movement to desired positions, in the X-Y position and the angle of said shock wave oscillating means (3), and in the position of said movement adjustment mechanism (9), by multiplying a constant with the difference in the angle before and after the movement and by adding a predetermined constant to this constant.

Inventors: KINASE ATSUSHI C O INTELLECTUA, TERAI FUJIO C O INTELLECTUAL P, KINASE, ATSUSHI C/O INTELLECTUAL PROPERTY DIVISION, TERAI, FUJIO C/O INTELLECTUAL PROPERTY DIVISION
Applicants: TOSHIBA KK, KABUSHIKI KAISHA TOSHIBA
Application year: 1989
Main classification: A61B17
IPC codes: A61B17, B23K26, A61B18