US20010023350A1 - Spine supporting system - Google Patents
Spine supporting system Download PDFInfo
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- US20010023350A1 US20010023350A1 US09/777,808 US77780801A US2001023350A1 US 20010023350 A1 US20010023350 A1 US 20010023350A1 US 77780801 A US77780801 A US 77780801A US 2001023350 A1 US2001023350 A1 US 2001023350A1
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- United States
- Prior art keywords
- outer cap
- head
- inner bolt
- spine
- supporting system
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
- A61B17/7001—Screws or hooks combined with longitudinal elements which do not contact vertebrae
- A61B17/7032—Screws or hooks with U-shaped head or back through which longitudinal rods pass
Abstract
The present invention relates to a spine supporting system for correcting or fixing a spine to be a stable state at a diseased part in spine operation. The spine supporting system of the present invention, permits a inner bolt to be inserted in an outer cap preliminarily such that the initial centering of the inner bolt is achieved to a head only by inserting the outer cap to the head of the screw, and therefore makes the insertion of the outer cap and inner bolt to the head easy. Also, by forming a seat recess at an upper part of the outer cap, in which the a head part of the inner bolt could be seated, the head, rod, and outer cap are joined to be integrated with each other so that mutual fixation becomes rigid. Further, by forming a round cut part at a lower part of the outer cap in which the rod is inserted, the insertion of the outer cap to the head becomes easy if the rod is lifted in the head.
In addition, In the spine supporting system which the inner bolt and outer cap is integrated, since the upper and lower part of the inner bolt is supported by the double structure of the outer cap and reinforcement ring, steady and forceful rotation is ensured and the head part is supported rigidly.
Description
- 1. Field of the Invention
- The present invention relates to a spine supporting system for correcting or fixing a spine to be a stable state at a diseased part in spine operation.
- 2. Background of the Related Art
- Generally, a spinal column (referred to as a ‘spine’ in the followings) of a normal human body standing erectly appears to be a straight line in front view and ‘Lasy-S’ curved in side view. That is, the thoracic spine has a shape gently bent backwardly in side view, while the cervical spine and the lumber spine has a shape bent forwardly.
- In the human body, the spine forms a curve of ‘Lasy-S’ by connecting a plurality of bodies of spine with a disk, one section of the spine consists of cylindrical body and the arch located backward, the posterior spinal arch comprises a spinal canal with a pair of pedicles, superior or inferior facets extending backwardly from the pedicles, laminas and a spinous process, and a nerve is located through the spinal canal.
- In such a spine, when the disk connecting the body is degenerated and ruptured so that it is separated from regular position or a joint consist of a rear projection of the spine is damaged and degenerated, and when the external force is loaded to or press the nerve passing through the spinal canal with various reasons such that the spine has a deformity and displacement from the normal position, it is known that pains are caused.
- Therefore, since the pain are occurred continuously when the spine is in unstable state as mentioned above, the diseased part of the spine should be decompressed in order to kill the pains, and an operation correcting or fixing a spine to be a stable state, is required due to the unstable state of the spine in decompressing.
- Namely, in case of a patient of which a part of the spine is broken or damaged, a corresponding spine or adjacent spine is supported through an operation using the spine supporting system. The spine supporting system used in this case, comprises a screw inserted to the damaged or adjacent upper and lower spinal pedicle of the spine as a supporting structure, a rod inserted in each of the screw, and a inner bolt and outer cap for fixing the rod to the screw.
- Referring to FIG. 1-FIG. 3, the spine supporting system according to the prior art will be explained roughly. FIG. 1 is an exploded perspective view showing a structure of a spine supporting system according to the prior art, FIG. 2 is a perspective view showing an operation process by a spine supporting system of the prior art, FIG. 3 is a sectional view showing an operation state by a spine supporting system of the prior art, and FIG. 4 is a perspective view for describing difficulties of an operation by a spine supporting system of the prior art.
- In these figures, a
reference numeral 10 is a screw having ahead 12 and abody 14 formed to be integrated with a lower part of thehead 12, areference numeral 20 is an inner bolt screwed in thehead 12 of thescrew 10, areference numeral 30 is an outer cap for improving the holding force of theinner bolt 20 by covering thehead 12 of thescrew 10, and areference numeral 40 is a rod inserted in thehead 12 of thescrew 10 to connecting thescrews 10 each other. - The
head 12 of thescrew 10 could be described divided into an inner structure and outer structure. The inner structure of thehead 12 includes afemale thread 11 for theinner bolt 20 and ‘U’ shapedgroove 16 for passing and fixing therod 40 which connects the spine supporting system described below, and the outer structure of thehead 12 includes a cap-assembledsurface 13 covered with theouter cap 30 to prevent the decrease of strength in thehead 12 due to the formation of thegroove 16 and to increase the fixation and ahead block 17 formed at an lower part of a cap-assembledsurface 13 and connected with thebody 14. - The
body 14 of thescrew 10 has a lengthy cone shape and is formed at a circumference thereof with a male thread, and an upper part thereof is integrated with the lower part of thehead 12. And, apoint 18 for the insertion to the spine is formed at a lower end of thebody 14. - The upper surface of the
inner bolt 20 is formed with atool insertion hole 22 in which assembling tool is inserted and along with a whole circumference, amale thread 24 joined with thefemale thread 11 is formed. - The
outer cap 30 includes aninner cavity 32 assembled with the cap assembledsurface 17 and anupper surface 34 formed perpendicularly relative to the length direction. - The
rod 40 has a diameter so as to be inserted in thegroove 16 of thescrew 16. - The function of the spine supporting system according to the prior art will be described referring to the FIG. 2 and FIG. 3. Firstly, describing the general operation procedure briefly, with incision and opening a skin of the operated part, the position in which the screw is inserted normal to the pedicle of the corresponding spine, is indicated, and then a hole is formed with a drill and the like. (Drilling Procedure)
- A tapping matching a pitch of the spine supporting system, is performed at the drilling hole and the spine supporting system (specifically, the body14) is driven in the spine with the
tool 100 and so on. Then, when the required number ofscrew 10 is screwed to be fixed in the pedicle of thespine 200 as described above, therod 40 which is bent suitable for the curvature of the spine, is inserted in thegroove 16. Subsequently, theinner bolt 20 set in the female thread 12 a is rotated several times with thetool 100 so that therod 40 is preliminarily fixed. After theouter cap 30 covers the cap assembledsurface 13 of thehead 12, therod 40 is fixed in thescrew 10 rigidly by joining theinner bolt 20 tightly and the skin is sutured to complete the spine operation. - Therefore, as shown in FIG. 2, it is known that in the state the
body 14 is fixed rigidly in the spine of the patient, therod 40 is fixed rigidly in thegroove 16, and further in theinner bolt 20 andscrew 10, it is said that the fixation of thehead 12 is stronger by theouter cap 30. - However, in the operation by the spine supporting system according to the prior art, the following defects and problems are occurring.
- 1. The difficulties in the insertion of the
outer cap 30 and the initial setting of theinner bolt 20. - In the spine operation using the spine supporting system of the prior art wherein the
rod 40 is fixed in thehead 12 of thescrew 10 by joining theinner bolt 20 in the female thread 12 a, theouter cap 30 is joined after theinner bolt 20 is joined in thefemale thread 11. - This joining sequence causes the following problems. In actual operation, since the incision area of the skin is adjusted as small as possible and the
inner bolt 20 has a diameter only 4 mm, it is very difficult to join the smallinner bolt 20 in thefemale thread 11 of thehead 12 with initial centering in the narrow space of operation without any guide means. - On the other hand, referring to FIG. 4, according to conditions the
rod 40 is not bent suitably. In this case the operation condition is worse, since the smallinner bolt 20 is joined in thefemale thread 11 where therod 40 is more curved upwardly in thegroove 16. That is, as theinner bolt 20 could be joined unsuitably interrupted by therod 40, the operator could be annoyed at the trial for centering in limited operation time. - According to the joining of the
inner bolt 20 prior to theouter cap 30, the centering of theinner bolt 20 is not achieved easily and the rapid joining is not easy due to the sliding and pitching during inserting, and therefore the operation is difficult and hard. - In addition, although the
inner bolt 20 is inserted in thefemale thread 11, the bolging-out effect of thecap assembling surface 13 is occurring by the strength decrease due to thegroove 16 of thehead 12 as the fixation of theinner bolt 20, so that the insertion of theouter cap 30 to the cap assembledsurface 13, is difficult and is causing the delay of the operation. - Furthermore, when the length of the
rod 40 is excessively short or long, therod 40 bent unsuitably is not seated in thegroove 16 and causes the rear part thereof to be lifted bent by elasticity itself, and thereby in joining theouter cap 30 andhead 12, the lower end of theouter cap 30 is interfered with by therod 40 so that the stable fixation could not be maintained and the use there of is more difficult. These phenomena are more significant in the insertion of therod 40 between the fifth lumbar and the first sacrum. - Though the
outer cap 30 is joined smoothly, thisouter cap 30 having only functions as a container could not operate to be associated with theinner bolt 20 so that the operation is failed by so-called loosening and separation which the rigid fixation between theinner bolt 20 andouter cap 30 is lost, and therefore the early recovery is not achieved as the patient complains of the pain. - Meanwhile, it may be assumed that the difficulties as mentioned above are solved by which the
inner bolt 20 is inserted in thefemale thread 11 after theouter cap 30 is inserted to thehead 12. However, in case of the first insertion of theouter cap 30, there is no means for holding theouter cap 30, so that the separation or damage of theouter cap 30 in the insertion of theinner bolt 20. Further, since therod 40 is often lifted upwardly in thegroove 16, the lower part of theouter cap 30 is interfered with by therod 40 and could not inserted in thehead 12 stably in this state. Therefore, the spine supporting system of the prior art has an unreasonable structure to solve the problem by inserting theouter cap 30 to thehead 12. - 2. The screw damages due to the design error
- As the spine supporting system of the prior art is not designed to be proportional ideally with regard to the
screw 10 and thehead 12, various problems of design due to this is caused and especially in case of thehead 12 which is formed to be large excessively, the moment causing the damage is concentrated on the boundary of thehead 12 andbody 14. This could be the fatal defect in the spine supporting system. - 3. Strength decreases and unbalanced rotation in the spine supporting system that outer cap is integrated with the inner bolt.
- In the spine supporting system of the prior art that outer cap is integrated with the inner bolt (not shown), as the inner bolt is joined only supported by the segment formed at the lower part of the outer cap, precise rotation could not be obtained and the fixation strength is weak due to the support of the inner bolt only in the lower part.
- Since many defects in the spine supporting system of prior structure, is an obstacle in the spine operation requiring a rapid and accurate work, the solution thereon is desperately requested in the related academic field.
- The basic concept of the spine supporting system set by the inventor, is to provide the apparatus that ensures the easiness in the insertion of the outer cap and initial setting of the inner bolt and is small and also easy to use, while exerting the rigid fixation.
- The easiness in use is the concept from the doctor using the spine supporting system and is the factor, which should be considered, since the value thereof is degraded if it takes long that the doctor is accustomed to it or the operation takes long, however good the apparatus could be. To obtain such a reasonable design, the design factors are divided that the factor could be modified and not modified, and the factor could be modified is researched intensively so as to maximize the function thereof.
- The present invention is contemplated to solve the aforementioned problem, and it is an object of the present invention to provide a spine supporting system, which could make the insertion of an outer cap and the initial centering of an inner bolt easy, strengthen the fixation, and contribute to the extension of life in the system by enabling the insertion of an inner bolt in a head to be guided by the outer cap and having the fixation of the outer cap, inner bolt, rod, and head to be integrated with each other after joining the outer cap rather than the inner bolt to head, departing from a fixed idea in the spine operation.
- It is another object of the present invention to provide the spine supporting system, which is applied suitably to that the rod is lifted excessively in the head, and which has a double structure ensuring steady and forceful rotation and supporting a head part rigidly in the spine supporting system, which the inner bolt and outer cap is integrated.
- According to one aspect of the present invention to accomplish the above object, it is provided a spine supporting system comprising: a screw having a cone shaped body and a head which includes at least a female thread, cap assembled surface, and a head block; a inner bolt having a male thread at an outer circumference to be inserted and mounted in the head of the screw; an outer cap having an inner cavity to cover the head of the screw; a rod inserted in the head of the screw and fixed by the outer cap and the inner bolt, being characterized that the outer cap is formed with a guide female thread at an upper part of an inner cavity, thereby joining the inner bolt to the guide female thread of the outer cap preliminary, and then joining the inner bolt to the female thread of the screw completely after mounting the outer cap to the head of the screw.
- It is preferable that inner bolt is formed with a head part extending outwardly from an upper part thereof, and the outer cap is formed at an upper part of the guide female thread with a seat recess, in which the head part of the inner bolt is fastened and seated.
- The inner cavity of the outer cap preferably includes a first and second step surface having different inner diameters in order to cover the cap-assembled surface and head block of the head.
- It is preferable that the guide female thread is formed with a pitch with a limited number of a crest and root, which the inner bolt is only joined to the outer cap preliminarily and guided thereby such that the centering in the joining of the female thread of the screw and inner bolt is not interfered with.
- It is preferable that the screw is formed with a first and second round surface at a boundary of the cap assembled surface and an upper surface, and a portion between the cap assembled surface and head block respectively, and the outer cap is formed with round surfaces at a portion between the first and second step surface, and an inner end of a lower part in the second step surface respectively.
- More preferably, the outer cap is formed with a round cut part cutting a rod connected portion thereof as a semicircle with 2 mm depth to avoid the interference of outer cap insertion by the rod in the actual operation.
- According to another aspect of the present invention to accomplish the above object, it is provided a spine supporting system comprising: an inner bolt formed with a respective fastening part of an upper part and fastening groove of the lower part; an outer cap formed with a supporting segment of an upper part, the supporting segment being joined rotatively with the fastening part of the inner bolt; and a reinforcement ring joined in the outer cap by tight fitting, a supporting segment in a lower part of the reinforcement ring being joined rotatively in the fastening groove of the inner bolt, wherein joining the inner bolt supported at the upper and lower part thereof by the outer cap and reinforcement ring.
- In the present invention, after the small inner bolt is joined with the outer cap preliminarily in the outer circumstance of operation part, the outer cap larger than the inner bolt covers the head of the screw, and then the inner bolt guided by the outer cap is joined with the female thread. Therefore, the initial setting of the inner bolt and the female thread of the head and the insertion of the outer cap and head become very easy. Additionally, in the complete joining of the inner bolt, the inner bolt and the head of the screw joined, and the seat recess of the outer cap is fastened to the head part of the inner bolt, so that the screw, inner bolt, and outer cap are integrated and exert the rigid fixation. Further, since the lower part of the inner cavity in the outer cap is formed large and main contacting part of the outer cap and head of the screw is round, the outer cap could be inserted in the head without any difficulties. Also, when the inner bolt is rotated in the insertion of the outer cap to the head, the inner bolt is inserted accurately in the female thread of the head automatically, so that the rapid and accurate operation could be schemed. Furthermore, since the outer cap covers and supports the entire head part, the fixation is strengthened and the life of system is extended.
- In the spine supporting system which the inner bolt and outer cap is integrated, since the upper and lower part of the inner bolt is supported by the double structure of the outer cap and reinforcement ring, steady and forceful rotation is ensured and the head part is supported rigidly.
- The features and advantages of the present invention will be more described specifically in the following description of preferred embodiments of the invention with reference to the accompanying drawings wherein:
- FIG. 1 is an exploded perspective view showing a structure of a spine supporting system according to the prior art;
- FIG. 2 is a perspective view showing an operation process by a spine supporting system of the prior art;
- FIG. 3 is a sectional view showing an operation state by a spine supporting system of the prior art;
- FIG. 4 is a perspective view for describing difficulties of an operation by a spine supporting system of the prior art;
- FIG. 5 is an exploded perspective view showing a structure of a spine supporting system according to the first embodiment of the present invention;
- FIG. 6 is a sectional view showing a functional principle of a spine supporting system according to the first embodiment of the present invention;
- FIG. 7 is a sectional view showing an operation sequence by a spine supporting system according to the first embodiment of the present invention;
- FIG. 8 is a perspective view showing an example of operation by a spine supporting system according to the first embodiment of the present invention;
- FIG. 9 is a sectional view showing another function of a spine supporting system according to the first embodiment of the present invention;
- FIG. 10 is an exploded perspective view showing a structure of a spine supporting system according to the second embodiment of the present invention;
- FIG. 11 is a sectional view showing a double structure of an outer cap and a reinforcement ring applied to a spine supporting system according to the second embodiment of the present invention;
- FIG. 12 is an exploded perspective view showing a double structure of an outer cap and a reinforcement ring applied to a spine supporting system according to the second embodiment of the present invention;
- FIG. 13 is an exploded perspective view showing an example of operation using a spine supporting system according to the second embodiment of the present invention; and
- FIG. 14 is a sectional view showing a function of a spine supporting system according to the second embodiment of the present invention.
- Reference will now be made in detail to the first and second embodiment of the present invention, examples of which are illustrated in the accompanying drawings. In explaining the present invention, the same names and reference numerals will be given to the same components, and explanations in the same will be omitted.
- The first embodiment of the present invention will be explained referring to FIG. 5 to FIG. 9. FIG. 5 is an exploded perspective view showing a structure of a spine supporting system according to the first embodiment of the present invention, and FIG. 6 is a sectional view showing a functional principle of a spine supporting system according to the first embodiment of the present invention.
- Generally in the spine supporting system, a
screw 10 is a rigid screw in which abody 14 is integrated with ahead 12 or a polyaxial screw, which could rotates at certain angle relative to a thehead 12 by forming a sphere on an upper end of abody 14. The first embodiment will be explained, with regard to the rigid screw. - In the drawings according the present embodiment the same numerals are given to the same components, and only differences to the prior art will be described in the followings.
- A boundary of cap assembled
surface 13 and anupper surface 13 b, and a step portion between the cap assembledsurface 13 and ahead block 13 is formed as around surface outer cap 30 is archived smoothly. - An
inner bolt 20 has ahead part 26, which extends and projects outwardly from an upper end thereof. - The
outer cap 30 has aseat recess 33, in which thehead part 26 of theinner bolt 20 could be inserted, a guidefemale thread 35 is formed at an inner end of theseat recess 33, and theinner bolt 20 is screwed in the guidefemale thread 35. The guidefemale thread 35 is formed to permit only 1.5 turns, i.e. 540 degrees and theinner bolt 20 is joined loosely, so that the centering is not interfered with when afemale thread 11 of thescrew 10 and theinner bolt 20 are joined together. That is, with this guidefemale thread 35, theinner bolt 20 is only joined with theouter cap 30 preliminarily. - Additionally, the
outer cap 30 has around cut part 36 of semicircle having a depth of 2 mm such that therod 40 does not interfere with the insertion of theouter cap 30 in the operation. Also, to cover theentire head 12, i.e. the entire cap assembledsurface 13 and a part of thehead block 17, aninner cavity 37 comprises afirst step surface 37 a and asecond step surface 37 b. Further, to ensure the easy and smooth insertion with theround surface head 12, a portion between thefirst step surface 37 a and thesecond step surface 37 b and an inner portion of the lower end is rounded. - The function and effectiveness of the first embodiment of the present invention will be explained referring to FIG. 7. FIG. 7 is a sectional view showing an operation sequence by a spine supporting system according to the first embodiment of the present invention, and FIG. 8 is a perspective view showing an example of operation by a spine supporting system according to the first embodiment of the present invention.
- Referring to these drawings, the general operation procedure described in the above is omitted, and only the function of the mechanism according to the present embodiment will be explained in detail. Firstly as illustrated in FIG. 7(A), the
rod 40 is mounted normal to be lifted slightly. In this state, theouter cap 30 of the present invention is joined with thefemale thread 11, and as the first step, theinner bolt 20 is joined preliminarily with the guidefemale thread 35. In this step, as theinner bolt 20 is caught in the guidefemale thread 35 by only rotation of 540 degrees, it could move to both side slightly. - This is for that no interference with regard to the centering of the
inner bolt 20 to thefemale thread 11 occurs in a ‘pre-assembling step’, which theinner bolt 20 is joined with thefemale thread 11. More specifically, when theinner bolt 20 is only caught in the guidefemale thread 35 and thus simply joined with theouter cap 30 preliminarily, the centering of theinner bolt 20 center easily to thefemale thread 11 and the sliding and pitching during the insertion is removed such that the insertion of theinner bolt 20 is to be accurate and swift, only by mounting theouter cap 30 to thehead 12 in the initial entry of theinner bolt 20. - When the preliminary joining of the
inner bolt 20 andouter cap 30 is completed, theouter cap 30 is inserted to thehead 12. In the insertion, with theround surface round surface 38 between the first andsecond step surface outer cap 30, and theround surface 39 in the inner portion of the lower end of theouter cap 30, the insertion is achieved easily as follows. - In the initial insertion of the
outer cap 30 to thehead 12 of thescrew 10, the first and second step surfaces 37 a, 37 b are in contact with the cap assembledsurface 13 and an outer surface of thehead block 17 respectively, and the round surfaces 38, 39 are in contact with the round surfaces 13 a, 19 individually, and thereby theouter cap 30 is inserted to thehead 12 smoothly. That is, each round surfaces 13 a, 19, 38, 39 functions as an insertion guide. Also, these functions naturally and automatically as the insertion guide due to the harmony with a wider diameter and a narrower diameter. - When the
outer cap 30 is completely inserted to thehead 12 of thescrew 10 as above, the first and second step surfaces 37 a, 37 b is to cover the entire cap assembledsurface 13 of thehead 12 and a part of thehead block 17. - After the
outer cap 30 is inserted to thehead 12 as above, as joining theinner bolt 20 using thetool 100 as can be seen in FIG. 7(B), theinner bolt 20 guided in theouter cap 30 is joined automatically in thefemale thread 11 of thescrew 10, and therod 40 is inserted in thegroove 16 of thescrew 10 by the fixing force of theinner bolt 20. And, as the inner bolt is joined further as shown in FIG. 7(C), the bottom surface of theinner bolt 20 fixes therod 20 in thehead 12 of thescrew 10 by pushing it, and at the same time thehead part 26 of theinner bolt 20 is inserted and seated in theseat recess 33 of theouter cap 30. - In such a complete joining of the
inner bolt 20, since theinner bolt 20 is inserted in thefemale thread 11 of thehead 12 in thescrew 10 and thehead 12 covered with thehead 12 maintains the integrated state which theseat recess 33 is fastened to thehead part 26 of theinner bolt 20, therod 40 is fixed in therod 40 rigidly. - As described above, the present invention fixes the
rod 40 in thescrew 10 by rotating and inserting theinner bolt 20 automatically in thefemale thread 11 of thehead 12. - FIG. 9 is a sectional view showing another function of a spine supporting system according to the first embodiment of the present invention.
- It is often a case that the actual operation is not the same as that in the textbook according to the state of the patient. FIG. 9 illustrates the state that the
inner bolt 20 is joined, as therod 40 is not mounted accurately in thegroove 16, in other words therod 40 is not in the well fitting. Therod 40 is lifted excessively to the upper part of thegroove 16. - In this state, as the
outer cap 30 of the present invention is inserted to thehead 12, theouter cap 30 is inserted to thehead 12 of thescrew 10 preliminarily with therod 40 is inserted in the round cutpart 36 formed in theouter cap 30. Subsequently, as theinner bolt 20 is fastened, theinner bolt 20 guided in theouter cap 30 is joined in thefemale thread 11 and this inserts theouter cap 30 to thehead 12, and thereby therod 40 in thehead 12 of thescrew 10 is fixes as the above. - FIG. 10 is an exploded perspective view showing a structure of a spine supporting system according to the second embodiment of the present invention, FIG. 11 is a sectional view showing a double structure of an outer cap and a reinforcement ring applied to a spine supporting system according to the second embodiment of the present invention, FIG. 12 is an exploded perspective view showing a double structure of an outer cap and a reinforcement ring applied to a spine supporting system according to the second embodiment of the present invention, FIG. 13 is an exploded perspective view showing an example of operation using a spine supporting system according to the second embodiment of the present invention, and FIG. 14 is a sectional view showing a function of a spine supporting system according to the second embodiment of the present invention.
- FIG. 10 illustrates the spine support system that is suitable to apply to the patient who needs to reduce the spine to the normal position by a reaction from which the
rod 40 connected to the plurality of the spine supporting system is tightened as theinner bolt 20 is joined where a cuttingsegment 51 is formed at an upper end of thehead 12 of thescrew 10. This supporting system is applied to the operation, in which restores an abnormalfixed spine 202 to the normal position relatively the spine supporting system, and then cut theunnecessary cutting segment 51 along a cuttingline 55, while therod 40 is forced to be pressed downwardly in the state that therod 40 is lifted excessively in thegroove 16. - In the second embodiment, the same names and reference numerals will be given to the same components of the first embodiment, and in the drawings the numerals will be given to characterized part so as to give the explanation more apparently.
- The
inner bolt 20 andouter cap 30 are integrated, and areinforcement ring 50 is joined in theouter cap 30 in the spine supporting system of the second embodiment - The
inner bolt 20 is formed with afastening part 23 at the upper part thereof and afastening groove 25 at the lower part thereof. - The
outer cap 30 is formed at the upper part thereof with a supportingsegment 30 d having a supportingend 30 c, which has the curvature corresponding an outer diameter of afastening part 23 of theinner bolt 20, and is formed with apunching point 30 b at the predetermined part of both sides. Also, the lower part ofouter cap 30 is formed with around cut part 30 f at a contact part with therod 40 in the insertion. - The
reinforcement ring 50 has an outer diameter to be fitted tightly in an inner diameter of the outer cap, and is formed with a fixingopening 50 c fastened at thepunching point 30 b, at an outer surface corresponding to the punching point 32 b of theouter cap 30. In addition, at the lower part thereof, a supportingsegment 50 a having a supportingend 50 b which has the curvature corresponding an outer diameter of thefastening groove 25 of theinner bolt 20, is formed. - In such a structure, the
reinforcement ring 50 is inserted in theouter cap 30, and thefastening part 23 andfastening groove 25 of theinner bolt 20 are inserted rotatively in the supportingsegment 30 d of theouter cap 30 and the supportingsegment 50 a of thereinforcement ring 50 respectively. - With respect to the function of the second embodiment according to the present invention, the explanation will be given referring FIG. 13 and FIG. 14. The patient, to whom the present embodiment is applied, is in the state that the spine is separated and dislocated from the normal position so that it touches or presses the nerve system. As the cutting
segment 51 extending from the upper part of a cap assembledsurface 13 in the spine supporting system of the present embodiment, in case of separation of the spine, therod 40 could be inserted in agroove 16 without any difficulties. - Referring to the FIG. 13, using the spine supporting system (A), (B), (C), a dislocated
abnormal spine 202 and an adjacentnormal spine 200 are connected with thecurved rod 40. In the state that the spine supporting system (C) in thenormal spine 200 is fixed, therod 40 is pressed by joining theinner bolt 20 tightly. Theabnormal spine 202 is pulled up and restored to the normal position, as the spine supporting system (A), (B) fixed in theabnormal spine 202 moves up as a reaction. After that, the cuttingsegment 51 is cut and disposed using a proper operation tool and the cuttingline 55. - While the
inner bolt 20 is joined by external force capable of restoring theabnormal spine 202 in fastening theinner bolt 20 tightly, the joining is not achieved and the initial centering is not easy, and thereby the operation becomes difficult, since the spine supporting system of the prior art supports theinner bolt 20 only in the lower part as the singleouter cap 30. However, since the present invention comprises a double structure of the outer cap andreinforcement ring inner bolt 20 rotatively, only by covering thehead 12 with theouter cap 30, the initial centering is achieved easily. Also, since the outer circumference of the head is supported rigidly by the double structure of the outer cap andreinforcement ring inner bolt 20 is inserted completely in thehead 12, the head part is supported rigidly. - While the application of a rigid screw in which the
body 14 andhead 12 are integrated is described in the first and second embodiment, the a polyaxial screw in which thebody 14 and thehead 12 could rotate could be adapted to the present invention, and it is apparent that this falls into the scope of the present invention. - The effects of the present invention could be summarized as follows.
- In the present invention, after the small inner bolt is joined with the outer cap preliminarily in the outer circumstance of operation part, the outer cap larger than the inner bolt covers the head of the screw, and then the inner bolt guided by the outer cap is joined with the female thread. Therefore, the initial setting of the inner bolt and the female thread of the head and the insertion of the outer cap and head become very easy. Additionally, in the complete joining of the inner bolt, the inner bolt and the head of the screw is joined, and the seat recess of the outer cap is fastened to the head part of the inner bolt, so that the screw, inner bolt, and outer cap are integrated with each other and exert the rigid fixation. Further, since the lower part of the inner cavity in the outer cap is formed large and main contacting part of the outer cap and head of the screw is round, the outer cap could be inserted in the head without any difficulties. Also, when the outer cap is inserted to the head, the inner bolt is inserted accurately in the female thread of the head automatically only by rotating the inner bolt, so that the rapid and accurate operation could be schemed. Furthermore, since the outer cap covers and supports the entire head part, the fixation is strengthened and the life of the supporting system is extended.
- In the spine supporting system which the inner bolt and outer cap is integrated, since the upper and lower part of the inner bolt is supported by the double structure of the outer cap and reinforcement ring, steady and forceful rotation is ensured and the head part is supported rigidly.
- Although a number of embodiment have described in the above specification, it should be apparent that the present invention could be embodied in many other specific mode included within the sprit and scope of the present invention. Thus, the present embodiments should be considered as illustrative, and the present invention could be modified within the scope of claims and the equivalent thereof.
Claims (6)
1. A spine supporting system comprising:
a screw having a cone shaped body and a head including at least a female thread, cap assembled surface, and a head block;
an inner bolt having a male thread at an outer circumference to be inserted and mounted in the head of the screw;
an outer cap having an inner cavity to cover the head of the screw;
a rod inserted in the head of the screw and fixed by the outer cap and the inner bolt, being characterized in that the outer cap is formed with a guide female thread at an upper part of an inner cavity, thereby joining the inner bolt to the guide female thread of the outer cap preliminary, and then joining the inner bolt to the female thread of the screw completely after mounting the outer cap to the head of the screw in the actual operation.
2. A spine supporting system according to , being characterized in that inner bolt is formed with a head part extending outwardly from an upper part thereof, and the outer cap is formed at an upper part of the guide female thread with a seat recess, in which the head part of the inner bolt is fastened and seated.
claim 1
3. A spine supporting system according to , being characterized in that the inner cavity of the outer cap includes a first and second step surface having different inner diameters in order to cover the cap assembled surface and head block of the head.
claim 1
4. A spine supporting system according to , being characterized in that the guide female thread is formed with a pitch of a limited number of a crest and root, which the inner bolt is only joined to the outer cap preliminarily and guided thereby such that the centering in the joining of the female thread of the screw and inner bolt, is not interfered with.
claim 1
5. A spine supporting system according to , being characterized in that the screw is formed with a first and second round surface at a boundary of the cap assembled surface and an upper surface and a portion between the cap assembled surface and head block respectively, and the outer cap is formed with round surfaces at a portion between the first and second step surface and an inner end of a lower part in the second step surface respectively.
claim 1
6. A spine supporting system comprising:
an inner bolt formed with a respective fastening part of an upper part and fastening groove of the lower part;
an outer cap formed with a supporting segment of an upper part, the supporting segment being joined rotatively with the fastening part of the inner bolt; and
a reinforcement ring joined in the outer cap by tight fitting, a supporting segment in a lower part of the reinforcement ring being joined rotatively in the fastening groove of the inner bolt, wherein joining the inner bolt supported at the upper and lower part thereof by the outer cap and reinforcement ring.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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KR2020000007403U KR200200582Y1 (en) | 2000-03-15 | 2000-03-15 | Prosthesis for connecting bone |
KR2000-7403 | 2000-03-15 |
Publications (2)
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US20010023350A1 true US20010023350A1 (en) | 2001-09-20 |
US6458132B2 US6458132B2 (en) | 2002-10-01 |
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Application Number | Title | Priority Date | Filing Date |
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US09/777,808 Expired - Fee Related US6458132B2 (en) | 2000-03-15 | 2001-02-05 | Spine supporting system |
Country Status (7)
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US (1) | US6458132B2 (en) |
EP (1) | EP1133951A3 (en) |
JP (1) | JP3680129B2 (en) |
KR (1) | KR200200582Y1 (en) |
CN (1) | CN1313068A (en) |
AU (1) | AU2409101A (en) |
WO (1) | WO2001067998A1 (en) |
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US6251112B1 (en) * | 2000-04-18 | 2001-06-26 | Roger P. Jackson | Thin profile closure cap for open ended medical implant |
-
2000
- 2000-03-15 KR KR2020000007403U patent/KR200200582Y1/en not_active IP Right Cessation
- 2000-12-29 WO PCT/KR2000/001566 patent/WO2001067998A1/en active Application Filing
- 2000-12-29 AU AU24091/01A patent/AU2409101A/en not_active Abandoned
-
2001
- 2001-01-26 JP JP2001018084A patent/JP3680129B2/en not_active Expired - Fee Related
- 2001-02-01 EP EP01102294A patent/EP1133951A3/en not_active Withdrawn
- 2001-02-05 US US09/777,808 patent/US6458132B2/en not_active Expired - Fee Related
- 2001-02-21 CN CN01104128A patent/CN1313068A/en active Pending
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Also Published As
Publication number | Publication date |
---|---|
JP3680129B2 (en) | 2005-08-10 |
AU2409101A (en) | 2001-09-24 |
EP1133951A3 (en) | 2003-11-19 |
EP1133951A2 (en) | 2001-09-19 |
JP2001258894A (en) | 2001-09-25 |
KR200200582Y1 (en) | 2000-10-16 |
WO2001067998A1 (en) | 2001-09-20 |
US6458132B2 (en) | 2002-10-01 |
CN1313068A (en) | 2001-09-19 |
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