for further illustrating the means and functions by which the present invention achieves the certain objectives , the following description , in conjunction with the accompanying drawings and preferred embodiments , is set forth as below to illustrate the implement , structure , features and effects of the subject matter of the present invention . according to the present invention , a spine correction kit at least comprises : a first rod , a second rod , a first ring member , and a second ring member . please refer to fig1 a through 1e for rods included in the spine correction kit . fig1 a , 1b , 1d , and 1e show the first rod and the second rod , while fig1 c show the first rod , the second rod , and the third rod . a detailed description thereto is given below . referring to fig1 a , 1b , the first rod 1 has a first zone 11 in which plural first raised teeth 111 are provided . each of the first raised teeth 111 has a first top edge 111 a , a first lateral 111 b , and a second lateral 111 c . the first lateral 111 b is connected to the second lateral 111 c by means of the first top edge 111 a . the first lateral 111 b and a major axis direction x 1 of the first rod 1 include a first included angle θ 1 . the second rod 2 has a second zone 21 in which plural second raised teeth 211 are provided . each of the second raised teeth 211 may have a second top edge 211 a , a third lateral 211 b , and a fourth lateral 211 c . the third lateral 211 b is connected to the fourth lateral 211 c by means of the second top edge 211 a . the third lateral 211 b and a major axis direction x 2 of the second rod 2 include a second included angle θ 2 . each range of the first included angle θ 1 and the second included angle θ 2 is between 85 and 95 degrees . these first raised teeth 111 and these second raised teeth 211 are complementary and configured to engage with each other . particularly , fig1 a and 1b are different for the following facts . in fig1 a , the first lateral 111 b of one of the first raised teeth is parallel with the top surface 12 of the first rod 1 , and the third lateral 211 b of the second raised teeth is parallel with the bottom surface 22 of the second rod 2 . in fig1 b , one of the first raised teeth 111 has its second lateral 111 c formed as an incline and connected to the top surface 12 of the first rod 1 , and one of the second raised teeth 211 has its fourth lateral 211 c formed as an incline and connected to the bottom surface 22 of the second rod 2 . alternatively , as shown in fig1 c , the first rod 1 further has a third zone 31 in addition to the first zone 11 . in the third zone 31 , plural third raised teeth 311 are provided . the third raised teeth 311 and the first raised teeth 111 of the first zone 11 are located at the both ends of the first rod 1 , respectively . each of the third raised teeth 311 has a third top edge 311 a , a fifth lateral 311 b , and a sixth lateral 311 c . the fifth lateral 311 b is connected to the sixth lateral 311 c by means of the third top edge 311 a . the fifth lateral 311 b and the major axis direction x 1 of the first rod 1 include a third included angle θ 3 . the third raised tooth 311 has its sixth lateral 311 c formed as an incline and connected to the bottom surface 13 of the first rod 1 . in this case , the spine correction kit further comprises a third rod 3 . the third rod 3 has a fourth zone 41 in which plural fourth raised teeth 411 are provided . each of the fourth raised teeth 411 has a fourth top edge 411 a , a seventh lateral 411 b , and eighth lateral 411 c . the seventh lateral 411 b is connected to the eighth lateral 411 c by means of the fourth top edge 411 a . the seventh lateral 411 b and the major axis direction x 1 of the first rod 1 include a fourth included angle 84 . each range of the third included angle θ 3 and the fourth included angle 84 is between 85 and 95 degrees , and the fourth raised tooth 411 has its eighth lateral 411 c formed as an incline and connected to the bottom surface 32 of the third rod 3 . these third raised teeth 311 and the fourth raised teeth 411 are complementary and configured to engage with each other . alternatively , referring to fig1 d , the first rod 1 has a first zone ii , and the second rod 2 has a second zone 21 . the first zone 11 is configured to contact the second zone 21 . alternatively , as shown in fig1 e , the first zone 11 may have a first cross - section 51 , and the second zone 21 may have a second cross - section 52 . the first cross - section 51 and the second cross - section 52 are equal in terms of area . in addition , as shown in fig2 a through 2c , the first rod , the second rod , and the third rod are not limited in terms of geometry , and each of them may be a round rod ( fig2 a ), a triangular rod ( fig2 b ), or a rectangular rod ( fig2 c ). in the present embodiment , all of these rods are round rods . in addition , fig3 a and 3b are top views of the raised teeth of the rods . in the aspect of fig1 a through 1c , the included angle between the first top edge 111 a and the major axis direction x 1 of the first rod 1 , the included angle between the second top edge 211 a and the major axis direction x 2 of the second rod 2 , the included angle between the third top edge 311 a and the major axis direction . x 1 of the first rod 1 , and the included angle between the fourth top edge 411 a and the major axis direction x 3 of the third rod 3 are not limited . for example , as shown in fig3 a , they may be between 85 and 95 degrees , or they may be between 50 and 130 degrees , as shown in fig3 b . preferably , the included angle between the first top edge 111 a and the major axis direction x 1 of the first rod 1 and the included angle between the second top edge 211 a and the major axis direction x 2 of the second rod 2 are equal , while the included angle between the third top edge 311 a and the major axis direction x 1 of the first rod 1 and the included angle between the fourth top edge 411 a and the major axis direction x 3 of the third rod 3 are equal . in addition , the diameter and volume of each rods , and the shape of each raised teeth are not limited to what recited in the embodiment . people of ordinary skill in the art may further improve the configuration according to practical needs . please refer to fig4 a as a schematic drawing and fig4 b through 4d as the top views of ring members of the spine correction kit . the spine correction kit may comprise two or more ring members . each ring member 6 has more than one through - hole 61 for receiving the first rod and the second rod , or the first rod and the third rod . therefore , the through - hole 61 may be any kinds of forms as long as the first rod and the second rod , or the first rod and the third rod can pass through it . from the top views of fig4 b through 4d , it may be an elliptic through - hole 61 ( as shown in fig4 b ), or two through - holes 61 and 62 ( as shown in fig4 c ), or an 8 - like through - hole 61 ( as shown in fig4 d ). besides , the through - hole 61 has a diameter in its major axis preferably greater than the sum of the diameters of the rods it receives . in other words , when the through - hole 61 receives the first rod and the second rod , the diameter in its major axis is preferably greater than the sum of the diameters of the first rod and the second rod . in addition , among the first raised teeth and the second raised teeth , the first included angle θ 1 between the first lateral 111 b and the major axis direction xi of the first rod 1 , and the second included angle θ 2 between the third lateral 211 b and the major axis direction x 2 of the second rod 2 may each range between 30 and 150 degrees , as shown in fig5 . the spine correction kit may further comprise a plurality of fixing components for fixing the rods and the ring members , or the rods and the target spine . the types of the fixing components are not particularly limited . in the present embodiment , the rods and the ring member are fixed together using set screws , while the rod and the target spine are fixed together using pedicle screws and corresponding nuts , but not limited thereto . alternatively , the ring members and the rod may be made as an undetachable member , or may be integrated as one piece according to the feasibility in manufacturing process or clinical needs , thereby minimizing the risk of failure and reducing manufacturing costs . first , the first rod 1 of fig1 a has its top surface 12 facing the first through - hole of the first ring member 64 and the second through - hole of the second ring member 65 ( i . e . placed in the first direction as shown in fig6 a ), and passes through the second through - hole of the second ring member 65 and the first through - hole of the first ring member 64 successively ( the configuration of the first ring member 64 and the second ring member 65 are shown in fig4 a ). a set screw 71 is used to fix the first ring member 64 to the first rod 1 , and that is close to the top surface 12 . then , the second rod 2 of fig1 a has its bottom surface 22 facing the first through - hole of the first ring member 64 and the second through - hole of the second ring member 65 ( i . e . placed in the second direction as shown in fig6 a ), and passes through the first through - hole of the first ring member 64 and the second through - hole of the second ring member 65 successively . a set screw 72 is used to fix the second ring member 65 to the second rod 2 , and that is close to the bottom surface 22 . a spine correction apparatus 10 of type 1 as shown in fig6 a is thus assembled . referring to fig6 a , the first raised teeth 111 of the first rod 1 contact the second raised teeth 211 of the second rod 2 , and the first raised teeth 111 and the second raised teeth 211 engage with each other . the second lateral 111 c of the first raised tooth 111 faces the fourth lateral 211 c of the second raised tooth 211 . in this case , by applying a pulling force in the second direction to the first rod 1 at the bottom surface 13 , or applying a pulling force in the first direction to the second rod 2 at the top surface 23 , the first rod 1 is moved in the second direction , or the second rod 2 is moved in the first direction , so the spine correction apparatus 10 is extended . however , a pushing force in the first direction applied to the first rod 1 at the bottom surface 13 , or a pushing force in the second direction applied to the second rod 2 at the top surface 23 , the first rod 1 is hard to move in the second direction , and the second rod 2 is hard to move in the first direction since each range of the first included angle θ 1 and the second included angle θ 2 is between 85 and 95 degrees . so the spine correction apparatus 10 is hard to be contracted . first , the first rod 1 of fig1 b has its top surface 12 facing the first through - hole of the first ring member 64 and the second through - hole of the second ring member 65 ( i . e . placed in the first direction as shown in fig6 b ), and passes through the first through - hole of the first ring member 64 and the second through - hole of the second ring member 65 successively ( the configuration of the first ring member 64 and the second ring member 65 are shown in fig4 a ). a set screw 71 is used to fix the first ring member 64 to the first rod 1 . then , the second rod 2 of fig1 b has its bottom . surface 22 facing the first through - hole of the first ring member 64 and the second through - hole of the second ring member 65 ( i . e . placed in the second direction as shown in fig6 b ), and passes through the second through - hole of the second ring member 65 and the first through - hole of the first ring member 64 successively . a set screw 72 is used to fix the second ring member 65 to the second rod 2 . a spine correction apparatus 20 of type 2 as shown in fig6 b is thus assembled . referring to fig6 b , the first raised teeth 111 of the first rod 1 contact the second raised teeth . 211 of the second rod 2 , and the first raised tooth 111 and the second raised tooth 211 engage with each other . the second lateral 111 c of the first raised tooth 111 faces the fourth lateral 211 c of the second raised tooth 211 . in this case , by applying a pulling force in the first direction to the first rod 1 at the bottom surface 13 , or applying a pulling force in the second direction to the second rod 2 at the top surface 23 , the first rod 1 is moved in the first direction , or the second rod 2 is moved in the second direction , so the spine correction apparatus 20 is contracted . however , a pulling force in the second direction applied to the first rod 1 at the bottom surface 13 , or a pulling force in the first direction applied to the second rod 2 at the top surface 23 , the first rod 1 is hard to move in the second direction , and the second rod 2 is hard to move in the first direction since each range of the first included angle θ 1 and the second included angle θ 2 is between 85 and 95 degrees . so the spine correction apparatus 20 is hard to be extended . first , the first rod 1 of fig1 c has its top surface 12 facing the first through - hole of the first ring member 64 and the second through - hole of the second ring member 65 ( i . e . in the first direction as shown in fig6 c ), and passes through the second through - hole of the second ring member 65 and the first through - hole of the first ring member 64 successively ( the configuration of the first ring member 64 and the second ring member 65 are shown in fig4 a ). a set screw 71 is used to fix the first ring member 64 to the first rod l then , the first rod 1 has its bottom surface 13 facing the third through - hole of the third ring member 66 and the fourth through - hole of the fourth ring member 67 ( i . e . in the second direction as shown in fig6 c ), and passes through the third through - hole of the third ring member 66 and the fourth through - hole of the fourth ring member 67 successively ( the third ring member 66 and the fourth ring member 67 are both structurally like those shown in fig4 a ). a set screw 74 is used to fix the fourth ring member 67 to the first rod 1 . then , the second rod 2 of fig1 c has its bottom surface 22 facing the first through - hole of the first ring member 64 and the second through - hole of the second ring member 65 ( i . e . in the second direction as shown in fig6 c ), and passes through first through - hole of the first ring member 64 and the second through - hole of the second ring member 65 successively . a set screw 72 is used to fix the second ring member 65 to the second rod 2 . at last , the third rod 3 of fig1 c has its top surface 32 facing the third through - hole of the third ring member 66 and the fourth through - hole of the fourth ring member 67 ( i . e . in the first direction as shown in fig6 c ), and passes through the fourth through - hole of the fourth ring member 67 and the third through - hole of the third ring member 66 successively . a set screw 73 is used to fix the third ring member 66 to the third rod 3 . a spine correction apparatus 30 of type 3 as shown in fig6 c is thus assembled . referring to fig6 c , the first raised teeth 111 of the first rod 1 contact the second raised teeth 211 of the second rod 2 , and the first raised teeth 111 and the second raised teeth 211 engage with each other . the second lateral 111 c of the first raised tooth 111 faces the fourth lateral 211 c of the second raised tooth 211 . at the same time , the third raised teeth 311 of the first rod 1 contact the fourth raised teeth 411 of the third rod 3 , and the first raised teeth 311 and the fourth raised teeth 411 engage with each other . the sixth lateral 311 c of the first raised tooth 111 faces the eighth lateral 411 c of the third raised tooth 411 . in this case , by applying a pulling force in the second direction to the first rod 1 at the bottom surface 13 , or applying a pulling force in the first direction to the second rod 2 at the top surface 23 , the first rod 1 is moved in the second direction , or the second rod 2 is moved in the first direction , so the spine correction apparatus 30 is extended . in addition , by applying a pushing force in the second direction to the first rod 1 at the top surface 12 , or applying a pushing force in the first direction to the third rod 3 at the bottom surface 33 , the first rod 1 is moved in the second direction , or the third rod 3 is moved in the first direction , so the spine correction apparatus 30 is contracted . thereby , the spine correction apparatus 30 of type 3 is a dual - functional design , the spine correction apparatus 30 can be extended at the end where the first rod 1 and the second rod 2 contact , and can be contracted at the other end where the first rod 1 and the third rod 3 contact . on the other hand , a pushing force in the first direction applied to the first rod 1 at the bottom surface 13 , or a pushing force in the second direction applied to the second rod 2 at the top surface 23 , the first rod 1 is hard to move in the first direction , and the second rod 2 is hard to move in the second direction since each range of the first included angle θ 1 and the second included angle θ 2 is between 85 and 95 degrees . where a pulling force in the first direction is applied to the first rod 1 at the top surface 12 , or a pulling force in the second direction is applied to the third rod 3 at the bottom surface 33 , the first rod 1 is hard to move in the first direction , and the third rod 3 is hard to move in the second direction since each range of the first included angle θ 1 and the second included angle θ 2 is between 85 and 95 degrees . thus , it is hard to contract the spine correction apparatus 30 at the end where the first rod 1 and the second rod 2 contact , and it is hard to extend the spine correction apparatus 30 at the other end where the first rod 1 and the third rod 3 contact . first , the first rod 1 of fig1 d has its top surface 12 facing the first through - hole of the first ring member 64 and the second through - hole of the second ring member 65 ( i . e . in the first direction as shown in fig6 d ), and passes through the second through - hole of the second ring member 65 and the first through - hole of the first ring member 64 successively ( the configuration of the first ring member 64 and the second ring member 65 are shown in fig4 a ). a set screw 71 is used to fix the first ring member 64 to the first rod 1 . then , the second rod 2 of fig1 d has its bottom surface 22 facing the first through - hole of the first ring member 64 and the second through - hole of the second ring member 65 ( i . e . in the second direction as shown in fig6 d ), and passes through first through - hole of the first ring member 64 and the second through - hole of the second ring member 65 successively . a set screw 72 is used to fix the second ring member 65 to the second rod 2 . a spine correction apparatus 40 of type 4 as shown in fig6 d is thus assembled . referring to fig6 d , the first zone 11 of the first rod 1 contacts the second zone 21 of the second rod 2 . in this case , by applying a pulling force in the second direction to the first rod 1 at the bottom surface 13 , or applying a pulling force in the first direction to the second rod 2 at the top surface 23 , the first rod 1 is moved in the second direction , or the second rod 2 is moved in the first direction , so the spine correction apparatus 40 is extended . alternatively , by applying a pushing force in the first direction to the first rod 1 at the bottom surface 13 , or applying a pushing force in the second direction to the second rod 2 at the top surface 23 , the first rod 1 is moved in the first direction , or the second rod 2 is moved in the second direction , so the spine correction apparatus 40 is contracted . thus , the spine correction apparatus 40 of type 4 is a dual - directional design and can be extended or contracted according to the direction of the applying force . first , the first rod 1 of fig1 e has its top surface 12 facing the first through - hole of the first ring member 64 and the second through - hole of the second ring member 65 ( i . e . the first direction as shown in fig6 e ), and passes through the second through - hole of the second ring member 65 and the first through - hole of the first ring member 64 successively ( the configuration of the first ring member 64 and the second ring member 65 are shown in fig4 a ). a set screw 71 is used to fix the first ring member 64 to the first rod 1 . then , the second rod 2 of fig1 d has its bottom surface 22 facing the first through - hole of the first ring member 64 and the second through - hole of the second ring member 65 ( i . e . in the second direction as shown in fig6 e ), and passes through first through - hole of the first ring member 64 and the second through - hole of the second ring member 65 successively . a set screw 72 is used to fix the second ring member 65 to the second rod 2 . a spine correction apparatus 50 of type 5 as shown in fig6 e is thus assembled . referring to fig6 e , the first cross - section 51 of the first rod 1 contacts the second cross - section 52 of the second rod 2 . in this case , by applying a pulling force in the second direction to the first rod 1 at the bottom surface 13 , or applying a pulling force in the first direction to the second rod 2 at the top surface 23 , the first rod 1 is moved in the second direction , or the second rod 2 is moved in the first direction , so the spine correction apparatus 50 is extended . alternatively , by applying a pushing force in the first direction to the first rod 1 at the bottom surface 13 , or applying a pushing force in the second direction to the second rod 2 at the top surface 23 , the first rod 1 is moved in the first direction , or the second rod 2 is moved in the second direction , so the spine correction apparatus 50 is contracted . thus , the spine correction apparatus 50 of type 5 is a dual - direction design , and capable of extending or contracting according to the direction of the applying force . in embodiment 2 , the first rod , the second rod , and the third rod are substantively parallel to each other . in other words , the major axes of the first rod , the second rod , and the third rod are parallel to each other . however , the present invention is not limited thereto , as long as the first zone of the first rod contacts the second zone of the second rod , and the third zone of the first rod contacts the fourth zone of the third rod . for a patient with c - shaped scoliosis , correction surgery involves installing the spine correction apparatus 10 of type 1 as shown in fig6 a at the concave side of the spine . referring to fig7 a , the patient &# 39 ; s spine with c - shaped scoliosis is referred to as the target spine 9 , and has a first end 9 a and second end 9 b . the spine correction apparatus 10 of type 1 shown in fig6 a is used to one &# 39 ; s spine correction . particularly , the first rod 1 is fixed to the first vertebral body 91 using the fixing component 81 at the concave side of the target spine 9 , and is fixed to the second vertebral body 92 using the fixing component 82 at the concave side of the target spine 9 . the second rod 2 is fixed to the third vertebral body 93 using the fixing component 83 at the concave side of the target spine 9 , and is fixed to the fourth vertebral body 94 using the fixing component 84 at the concave side of the target spine 9 . therein , the first vertebral body 91 and the second vertebral body 92 are close to the first end 9 a of the target spine 9 , while the third vertebral body 93 and the fourth vertebral body 94 are close to the second end 9 b of the target spine 9 . fig7 b and fig7 c are exploded and the front views of the spine correction apparatus 10 of type 1 . therein , a buffer space may be provided between the second ring member 65 and the first rod 1 , and another buffer space may be provided between the first ring member 64 and the second rod 2 . the buffer spaces may accommodate therein flat springs 641 , 651 , respectively , which are fixed to the first ring member 64 and the second ring member 65 by means of pins 642 , 652 , respectively , so as to keep the two rods further close . in addition , the fixing components 81 , 82 , 83 and 84 used in the present embodiment are pedicle screws and their matching nuts as described in the spine correction kit of embodiment 1 , as shown in fig7 b and 7c . it is to be noted , each of the rods not necessarily to use two fixing components to fixed to the vertebral body . instead , one or more than one fixing components shall be used according to the patient &# 39 ; s clinical conditions . with the foregoing arrangement , as the target spine 9 grows , the first rod 1 fixed to the first end 9 a of the target spine 9 receives a pulling force in the second direction , and the second rod 2 fixed to the second end 9 b of the target spine 9 receives a pulling force in the first direction . in this way , the spine correction apparatus 10 extends with the growth of the target spine 9 , thereby effectively correcting scoliosis and providing sufficient support to the spine . alternatively , another spine correction apparatus may be installed at the convex side of the target spine 9 . as shown in fig7 d , the spine correction apparatus 20 of type 2 , the spine correction apparatus 40 of type 4 or the spine correction apparatus 50 of type 5 may be installed at the convex side of the target spine 9 . similarly , as learned from the description related to fig7 a , when the spine correction apparatus 20 of type 2 , the spine correction apparatus 40 of type 4 or the spine correction apparatus 50 of type 5 is installed at the convex side of the target spine 9 , fixing components are used to fix the first rod and the second rod to the vertebral bodies at the first end 9 a and the second end 9 b of the target spine 9 , respectively . in this way , at the concave side of the target spine 9 , the spine correction apparatus 10 extends with the growth of the target spine 9 , and at the convex side of the target spine 9 , the spine correction apparatus 20 of type 2 , the spine correction apparatus 40 of type 4 or the spine correction apparatus 50 of type 5 contracts with the growth of the target spine 9 . by installing proper correction apparatuses at the concave side and the convex side of the target spine 9 , the efficiency of the correction surgery can be significantly improved . for a patient with s - shaped scoliosis , correction surgery involves installing the spine correction apparatus 30 of type 3 as shown in fig6 c . referring to fig8 a , the patient &# 39 ; s spine with s - shaped scoliosis is referred to as the target spine 9 , and has a first end 9 a , a second end 9 b and a center point 9 c ( the center point 9 c is the center point of the link between the first end 9 a and the second end 9 b , or the turning point of the s - shaped scoliosis ). the spine correction apparatus 30 of type 3 shown in fig6 c is used . the first rod 1 is fixed to the first vertebral body 91 of the target spine 9 using the fixing component 81 at the border between the concave and convex sides of the target spine 9 , and is fixed to the second vertebral body 92 of the target spine 9 using the fixing component 82 at the border between the concave and convex sides of the target spine 9 . the second rod 2 is fixed to the third vertebral body 93 using the fixing component 83 at the concave side of the target spine 9 , and is fixed to the fourth vertebral body 94 using the fixing component 84 at the concave side of the target spine 9 . the third rod 3 is fixed to the fifth vertebral body 95 using the fixing component 85 at the convex side of the target spine 9 , and is fixed to the sixth vertebral body 96 using the fixing component 86 at the convex side of the target spine 9 . therein , the first vertebral body 91 and the second vertebral body 92 are close to the center point 9 c of the target spine 9 , while the third vertebral body 93 and the fourth vertebral body 94 are close to the second end 9 b of the target spine 9 , while the fifth vertebral body 95 and the sixth vertebral body 96 are close to the first end 9 a of the target spine 9 . in addition , the fixing components 81 , 82 , 83 , 84 , 85 and 86 used in the present embodiment are pedicle screws and their matching nuts as described in the spine correction kit of embodiment 1 . with the foregoing arrangement , as the target spine 9 grows , the first rod 1 fixed to the center point 9 c of the target spine 9 receives a pulling force in the second direction , and the second rod 2 fixed to the second end 9 b of the target spine 9 receives a pulling force in the second rod 2 . in this way , the spine correction apparatus 30 extends at the end where the first rod 1 and the second rod 2 contact as the target spine 9 grows . in addition , when the target spine 9 grows , the first rod 1 fixed to the center point 9 c of the target spine 9 receives a pushing force in the second direction , and the third rod 3 fixed to the first end 9 a of the target spine 9 receives a pushing force in the first direction . in this way , contraction happens from the end where the first rod 1 and the third rod 3 contacts with the growth of the target spine 9 , thereby effectively correcting scoliosis and providing sufficient support to the spine . alternatively , another spine correction apparatus may be installed at the other side of the target spine 9 . as shown in fig8 b , one spine correction apparatus 30 of type 3 is installed at one side of the target spine 9 , while another spine correction apparatus 30 ′ of type 3 , as the spine correction apparatus 30 shown in fig7 a , is reversely installed at the other side of the target spine 9 . as described above , fixing components are used to fix the first , second , and third rods of the spine correction apparatus 30 ′ to the vertebral body at the center point 9 c , the first end 9 a , and the second end 9 b of the target spine 9 , respectively . in this manner , the efficiency of the correction surgery can be significantly improved . the disclosed spine correction apparatus including two rods with mutually complementary raised teeth ensure the spine with sufficient support by the engagement with the raised teeth . also , with the specific range of the angles between the raised teeth and the major axes , the two rods are limited to move oppositely as the spine grows and thereby make the overall length increase or decrease . in addition , when the spine correction apparatus is implanted into a patient &# 39 ; s body , with the assistance from the contracture of soft tissue or from the flat spring , the two rods are bound tightly and unlikely to come off from each other . the present invention has been described with reference to the preferred embodiments , and it is understood that the embodiments are not intended to limit the scope of the present invention . moreover , the contents disclosed herein should be readily understood and can be implemented by a person skilled in the art , all equivalent changes or modifications which do not depart from the concept of the present invention should be encompassed by the appended claims .
a spine correction apparatus is disclosed , comprising : a first rod member having a first zone ; a second rod member having a second zone ; a first ring member having a first through - hole ; and a second ring member having a second through - hole ; wherein the first zone contacts the second zone , the first rod member and the second rod member are inserted into the first through - hole and the second through - hole , the first through - hole is fixed to the first rod member , and the second through - hole is fixed to the second rod member . the spine correction apparatus lowers the requirement for repeated surgeries and achieves the purpose of self - correction .