Disclosure of Invention
In order to solve one or more of the above-mentioned drawbacks in the prior art, the present invention provides a femoral head necrosis support rod.
The invention provides a femoral head necrosis support rod which is characterized by comprising a head section rod (1) and a tail section rod (2), wherein a head section inner hole (1-1) is formed in the center of the head section rod (1), a tail section inner hole (2-1) is formed in the center of the tail section rod (2), a first external thread (2-2) is formed in the outer side wall of the tail section rod (2), a first spiral groove (1-2) is formed in the outer side wall of the head section rod (1), a first radial hole (1-3) is formed in the inner side wall of the head section rod (1), and the first radial hole (1-3) enables the first spiral groove (1-2) to be communicated with the head section inner hole (1-1). By adopting the scheme, when in use, the head section rod (1) and the tail section rod (2) are implanted into the femoral head simultaneously, and the tail section rod is fixed by screwing the first external thread and the femoral head thread, so that the head section rod is prevented from sliding outwards. Firstly, because the head section rod (1) and the tail section rod (2) are implanted into the femoral head, a good supporting effect on a femoral head necrosis area can be achieved, collapse of the femoral head can be avoided, secondly, because the first spiral groove (1-2) is arranged on the outer side wall of the head section rod (1), a first radial hole (1-3) is arranged on the inner side wall of the head section rod (1), the first spiral groove (1-2) is communicated with the head section inner hole (1-1), tissue fluid in the femoral head necrosis area is collected in a full range through the first spiral groove (1-2) and flows into the head section inner hole (1-1) through the first radial hole (1-3), and then flows out of the bone from the tail section inner hole (2-1), the tissue fluid which causes internal pressure to be increased in the femoral head in the early stage of implantation and the necrotized tissue fluid are all led out of the bone, thirdly, because the first spiral groove (1-2) has high friction stability with the bone, a certain gap space is formed between the first spiral groove (1-2) and the bone, new bone cells can be induced to grow in a new bone support area, the bone support performance can be reduced, the bone support performance can be well combined with the bone support performance can be improved, and the bone support performance can be well, and the bone support can be well formed, and the bone support can be well moved, and the bone support can be well combined, and the bone support can be well, and the patient can be well moved and the patient can be well and the well be used in a patient.
Further, a reinforcing lining piece is arranged on the inner wall of the inner hole (1-1) of the head section. When the head segment rod (1) is made of allogeneic bone pubis or radius, the supporting strength is insufficient because the thickness of the side wall is smaller and the strength is limited after the allogeneic bone pubis or radius processes the inner hole. The reinforcing lining piece is lined in the head section bar (1) so as to greatly improve the deformation resistance strength of the head section bar (1), and can greatly enhance the supporting effect on the femoral head necrosis area so as to avoid the collapse of the femoral head. In addition, the lining is arranged, so that the problem that the reinforced lining piece is in direct contact with the bone body of the user to cause serious rejection can be greatly reduced or directly avoided.
As a first preferred aspect, the reinforcing liner employs a rigid flight (3-1). The rigid spiral sheet (3-1) is screwed into the inner wall of the head section inner hole (1-1) of the head section rod (1) to form a spiral support, the installation is convenient, and meanwhile, the rigid spiral sheet (3-1) is tightly clamped after being screwed in a spiral manner, so that the axial looseness is avoided, and meanwhile, the drainage function of the first radial hole (1-3) is not influenced.
As a second preferable mode, the reinforcing lining member adopts a rigid lining (3-2), a second spiral groove (3-21) is arranged on the outer wall surface of the rigid lining (3-2), and a second radial hole (3-22) which enables the second spiral groove (3-21) to be communicated with the inner hole of the rigid lining (3-2) is arranged on the rigid lining (3-2). The rigid lining (3-2) is screwed into the inner wall of the head section inner hole (1-1) of the head section bar (1) to form a circumferential strength support, the second spiral groove (3-21) is in interference fit with the head section inner hole (1-1) of the head section bar (1) and is in rough fit, loosening can be avoided, meanwhile, tissue fluid drained from the first radial hole (1-3) can flow into the inner hole of the rigid lining (3-2) from the second radial hole (3-22) after being collected through the second spiral groove (3-21), and then flows out of bone through the tail section inner hole (2-1).
The rigid bushing (3-2) is made of titanium alloy or other known materials which can provide sufficient rigidity and can be implanted into bone.
Further, the head section bar (1) and the tail section bar (2) are fixed through a thread structure. The head section bar (1) and the tail section bar (2) are fixed into a whole to improve the overall strength, and meanwhile relative axial displacement looseness between the head section bar (1) and the tail section bar (2) is avoided.
Preferably, a second internal thread (1-11) is arranged on the inner wall of the tail end of the head section inner hole (1-1) of the head section rod (1);
The tail end of the tail section rod (2) is provided with an extension pipe (2-11) and a step surface (2-12), a second external thread (2-111) matched with the second internal thread (1-11) is arranged on the outer wall of the extension pipe (2-11), a plurality of one-way stop teeth (2-121) are arranged on the step surface (2-12) along the circumferential direction, a plurality of one-way stop grooves (1-13) matched with the one-way stop teeth (2-121) are arranged on the tail end surface of the head section rod (1) along the circumferential direction, and the direction of rotation of the extension pipe (2-11) when the extension pipe is screwed into the second internal thread (1-11) is opposite to the direction of stopping the one-way stop teeth (2-121) by the one-way stop grooves (1-13). When the second external thread (2-111) and the second internal thread (1-11) of the extension pipe (2-11) are screwed in place, the unidirectional blocking teeth (2-121) are blocked by the unidirectional blocking grooves (1-13) to limit the inverse screwing looseness of the second external thread (2-111) and the second internal thread (1-11) of the extension pipe (2-11), and the tail section rod (2) and the head section rod are mutually self-locked and cannot be axially and rotationally loosened at the same time.
Preferably, the one-way stop groove (1-13) and the one-way stop tooth (2-121) are serrated.
Preferably, the head section bar (1) and the tail section bar (2) are made of allogeneic bone pubis or radius. Thus, the head section bar (1) and the tail section bar (2) have the same stress and strain modes in the femoral head, and the stress shielding effect can be reduced.
In addition, another object of the invention is to disclose a using method, which adopts the above technical scheme to select the supporting rod for necrosis of femoral head, and is characterized by comprising the following steps:
s10, drilling holes on the femur necrosis part by using a bone drill to obtain a cavity;
S20, cleaning up the necrotic part in the cavity by using a curet;
s30, tapping the outer end of the cavity by using a screw tap to obtain a first internal thread with the length of 25-35mm;
s40, the head section rod is plugged into the cavity;
s50, the head end of the tail section rod is plugged into the cavity, and then the tail section rod is turned to enable the first external thread and the first internal thread to be screwed and fixed, and the head section rod is prevented from sliding outwards.
The beneficial effects of the invention are as follows:
firstly, the head section bar and the tail section bar are implanted into the femoral head, so that the invention can realize good supporting effect on the necrosis area of the femoral head and avoid collapse of the femoral head;
Secondly, the first spiral groove is arranged on the outer side wall of the head section rod, the first radial hole is arranged on the inner side wall of the head section rod and enables the first spiral groove to be communicated with the inner hole of the head section, so that tissue fluid in a necrosis area of the femoral head is collected in a full range through the first spiral groove and flows into the inner hole of the head section through the first radial hole, and then flows out of bone from the inner hole of the tail section, and the tissue fluid which causes the internal pressure increase in the femoral head and the necrotic tissue fluid can be completely led out of bone in the early stage of implantation;
Thirdly, the first spiral groove has high friction stability with the bone, and a certain clearance space is reserved to enable new bone cells to grow, so that the formation of new bone can be induced, bone tissue ingrowth is facilitated, the tight combination of the bone tissue ingrowth and the support rod is improved, the good treatment effect is achieved, and the displacement loosening risk of the femoral head necrosis support rod can be reduced under the condition that a patient walks normally;
Fourth, the invention greatly improves the deformation resistance of the head segment rod because the reinforcing lining piece is lined in the head segment rod, and can greatly enhance the supporting effect on the femoral head necrosis area to avoid the collapse of the femoral head. In addition, the lining is adopted, so that the problem that the reinforced lining piece is in direct contact with the bone body of the body to cause serious rejection can be greatly reduced or directly avoided;
Fifth, the present invention employs a rigid flight due to the reinforcement liner. The rigid spiral sheet is screwed into the inner wall of the inner hole of the head section rod to form a spiral support, so that the installation is convenient, the rigid spiral sheet is clamped after being screwed in, the axial looseness is avoided, and the drainage function of the first radial hole is not influenced;
Sixth, because the rigid lining is screwed into the inner wall of the head section inner hole of the head section bar to form a circumferential strength support, and the second spiral groove is in interference fit with the head section inner hole of the head section bar in a rough fit, loosening can be avoided;
seventh, according to the invention, the head section bar and the tail section bar are fixed through a thread structure. The head section bar and the tail section bar are fixed into a whole to improve the integral strength, and meanwhile, the relative axial displacement looseness between the head section bar and the tail section bar is avoided;
Seventh, because the direction of rotation of the extension pipe of the tail section rod when the extension pipe is screwed into the second internal thread of the head section rod is opposite to the direction of stopping the unidirectional stopping tooth by the unidirectional stopping groove, when the second external thread of the extension pipe and the second internal thread are screwed into place, the unidirectional stopping tooth is stopped by the unidirectional stopping groove to limit the second external thread of the extension pipe and the second internal thread from reversely loosening, and the tail section rod and the head section rod are mutually self-locked and cannot axially and rotationally loosen at the same time;
Eighth, the head segment rod and the tail segment rod are made of allogeneic bone pubis or radius, and have the same stress and strain modes in the femoral head, so that the stress shielding effect can be reduced.
Detailed Description
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
embodiment one referring to fig. 1-6, a femoral head necrosis support rod comprises a head section rod 1 and a tail section rod 2. The center of the head section rod 1 is provided with a head section inner hole 1-1, the center of the tail section rod 2 is provided with a tail section inner hole 2-1, the outer side wall of the tail section rod 2 is provided with a first external thread 2-2, the outer side wall of the head section rod 1 is provided with a first spiral groove 1-2, the inner side wall of the head section rod 1 is provided with a first radial hole 1-3, and the first radial hole 1-3 enables the first spiral groove 1-2 to be communicated with the head section inner hole 1-1.
Preferably, the first helical groove 1-2 has a depth T of 2-3mm.
Preferably, the cephalad segment rod 1 and the caudal segment rod 2 are made from allogeneic bone pubis or radius. Thus, the head section bar 1 and the tail section bar 2 have the same stress and strain modes in the femoral head, and the stress shielding effect can be reduced.
In addition, a linear cutter groove 2-3 or a cross cutter groove is arranged on the tail end surface of the tail section rod 2. Can be operated by means of a straight knife or a cross knife knob, thereby saving time and labor.
The preparation method of the femoral head necrosis support rod of the embodiment comprises the following steps:
firstly, selecting materials, wherein the head section bar 1 and the tail section bar 2 can be allogeneic bone pubic bone or radius;
blanking, namely cutting pubic bone or radius with a sawing machine to be 70-80mm long;
rough machining, namely turning, clamping one end of the workpiece by a chuck for 2-3mm, propping the other end of the workpiece by an outer center, and cutting after centering.
And finishing, namely turning the rough machined blank, machining the outer circle part and the thread part, and finally machining the inner hole and the two end faces.
The using method of the femoral head necrosis support rod of the embodiment can comprise the following steps:
s10, drilling holes on the femur necrosis part by using a bone drill to obtain a cavity;
S20, cleaning up the necrotic part in the cavity by using a curet;
s30, tapping the outer end of the cavity by using a screw tap to obtain a first internal thread with the length of 25-35mm;
s40, the head section rod is plugged into the cavity;
S50, the head end of the tail section rod is plugged into the cavity, and then the tail section rod is turned to enable the first external thread and the first internal thread to be screwed and fixed, and the head section rod is prevented from sliding outwards. In this embodiment, the tail section bar abuts the head section bar.
In use, the head segment rod 1 and the tail segment rod 2 are simultaneously implanted into the femoral head, and the tail segment rod is fixed by screwing the first external thread of the tail segment rod and the femoral head thread, so that the head segment rod is prevented from sliding outwards.
The invention has the following characteristics and is analyzed as follows:
firstly, because the head segment rod 1 and the tail segment rod 2 are implanted into the femoral head, a good supporting effect on a femoral head necrosis area can be realized, and the collapse of the femoral head can be avoided;
Secondly, as the first spiral groove 1-2 is arranged on the outer side wall of the head section bar 1, the first radial hole 1-3 is arranged on the inner side wall of the head section bar 1, and the first radial hole 1-3 enables the first spiral groove 1-2 to be communicated with the head section inner hole 1-1, so that tissue fluid in a necrosis area of the femoral head is collected in a full range through the first spiral groove 1-2 and flows into the head section inner hole 1-1 through the first radial hole 1-3, and then flows out of bone from the tail section inner hole 2-1, the tissue fluid which causes internal pressure increase in the femoral head and the necrotized tissue fluid can be completely led out of bone in the early stage of implantation;
Thirdly, because the first spiral groove 1-2 has very high friction stability with the bone, a certain clearance space is reserved at the same time to enable new bone cells to grow, the formation of new bone can be induced, the bone tissue growth is facilitated, the tight combination of the bone tissue growth and the supporting rod is improved, the mechanical property is improved, the treatment effect is good, and the displacement loosening risk of the supporting rod caused by femoral head necrosis can be reduced under the condition that a patient walks normally.
The second embodiment is basically the same as the first embodiment, except that:
Referring to fig. 7 to 12, further, the head rod 1 and the tail rod 2 are fixed by a screw structure. The head section bar 1 and the tail section bar 2 are fixed into a whole to improve the integral strength, and meanwhile relative axial displacement looseness between the head section bar 1 and the tail section bar 2 is avoided.
Preferably, a second internal thread 1-11 is arranged on the inner wall of the tail end of the head section inner hole 1-1 of the head section rod 1;
The head end of the tail section rod 2 is provided with an extension pipe 2-11 and a step surface 2-12, the outer wall of the extension pipe 2-11 is provided with a second external thread 2-111 which is used for being matched with a second internal thread 1-11, the step surface 2-12 is provided with a plurality of unidirectional stop teeth 2-121 (uniformly distributed along the circumferential direction), the tail end surface of the head section rod 1 is provided with a plurality of unidirectional stop grooves 1-13 (uniformly distributed along the circumferential direction) which are used for being matched with the unidirectional stop teeth 2-121 along the circumferential direction, and the rotation direction of the extension pipe 2-11 when the extension pipe is screwed into the second internal thread 1-11 is opposite to the direction of the unidirectional stop grooves 1-13 for stopping the unidirectional stop teeth 2-121. When the second external thread 2-111 of the extension tube 2-11 and the second internal thread 1-11 are screwed in place, the unidirectional stop tooth 2-121 is stopped and blocked by the unidirectional stop groove 1-13 to limit the inverse rotation looseness of the second external thread 2-111 of the extension tube 2-11 and the second internal thread 1-11, the tail section rod 2 and the head section rod are mutually self-locked and can not loose axially and rotationally, so that the coaxial long-term stable rigid connection can be ensured, meanwhile, the mutual looseness is prevented, the femoral head necrosis support rod can be stably and reliably supported in the femoral head for a long term, and the new bone growth bonding strength is facilitated (the new bone growth bonding strength can be seriously influenced due to the tiny looseness).
Preferably, the one-way stop groove 1-13 and the one-way stop tooth 2-121 are saw-toothed.
The using method of the femoral head necrosis support rod of the embodiment can comprise the following steps:
s10, drilling holes on the femur necrosis part by using a bone drill to obtain a cavity;
S20, cleaning up the necrotic part in the cavity by using a curet;
s30, tapping the outer end of the cavity by using a screw tap to obtain a first internal thread with the length of 25-35mm;
s40, the head section rod is plugged into the cavity;
S50, the head end of the tail section rod is plugged into the cavity, then the first external thread and the first internal thread of the tail section rod are screwed and fixed by turning the tail section rod, when the second external thread 2-111 and the second internal thread 1-11 of the extension tube 2-11 are screwed in place, the one-way stop tooth 2-121 is blocked and blocked by the one-way stop groove 1-13 to limit the second external thread 2-111 and the second internal thread 1-11 of the extension tube 2-11 to be reversely screwed and loosened, and the tail section rod 2 and the head section rod are mutually self-locked and simultaneously cannot be axially and spirally loosened to prevent the head section rod from outwards sliding out.
Embodiment III this embodiment is substantially the same as either embodiment one or two, except that:
Referring to fig. 13-15, in this embodiment, a reinforcing liner is provided on the inner wall of the head section bore 1-1. When the head rod 1 is made of allogeneic bone pubis or radius, the supporting strength is insufficient because the thickness of the side wall is smaller and the strength is limited after the allogeneic bone pubis or radius processes the inner hole. The reinforcing lining piece is lined in the head segment rod 1, so that the deformation resistance strength of the head segment rod 1 is greatly improved, and the supporting effect on the femoral head necrosis area can be greatly enhanced, and the collapse of the femoral head is avoided. In addition, the lining is arranged, so that the problem that the reinforced lining piece is in direct contact with the bone body of the user to cause serious rejection can be greatly reduced or directly avoided.
In this embodiment, the reinforcing lining member adopts a rigid lining member 3-2, a second spiral groove 3-21 is provided on the outer wall surface of the rigid lining member 3-2, and a second radial hole 3-22 is provided on the rigid lining member 3-2 to allow the second spiral groove 3-21 to communicate with the inner hole of the rigid lining member 3-2. The rigid lining 3-2 is screwed into the inner wall of the head section inner hole 1-1 of the head section bar 1 to form a circumferential strength support, the second spiral groove 3-21 is in interference fit with the head section inner hole 1-1 of the head section bar 1 and is in rough fit, loosening can be avoided, meanwhile, tissue fluid led out of the first radial hole 1-3 can flow into the inner hole of the rigid lining 3-2 from the second radial hole 3-22 after being collected by the second spiral groove 3-21, and then flows out of bone from the tail section inner hole 2-1.
The rigid liner 3-2 is made of titanium alloy or other known materials that provide sufficient rigidity and can be implanted into bone.
Preferably, the thickness of the rigid bush is 2-4 mm, the depth of the second spiral groove 3-21 is 1mm, the width is 3-5mm, and the pitch is 6-7mm. This ensures that sufficient lining support strength is provided, while ensuring that the tissue fluid flows smoothly through the second helical groove 3-21 and then from the second radial bore 3-22 into the inner bore of the rigid liner 3-2.
Preferably, the inner bore of the extension tube 2-11 is equal to the inner bore of the rigid liner 3-2. Each of the second radial holes 3-22 corresponds to each of the first radial holes 1-3 in one-to-one relation in the axial direction. Thus, when the second external thread 2-111 of the extension pipe 2-11 is screwed into the second internal thread 1-11 to be locked, the rigid bush 3-2 is extruded to move axially inwards and abut outwards, the rigid bush 3-2 can be prevented from sliding outwards, meanwhile, the rigid bush 3-2 is positioned and installed, the second radial hole 3-22 can be aligned with or close to the first radial hole 1-3, the drainage path length can be reduced, and timely drainage and discharge are utilized.
The using method of the femoral head necrosis support rod of the embodiment can comprise the following steps:
s10, drilling holes on the femur necrosis part by using a bone drill to obtain a cavity;
S20, cleaning up the necrotic part in the cavity by using a curet;
s30, tapping the outer end of the cavity by using a screw tap to obtain a first internal thread with the length of 25-35mm;
s40, screwing the reinforced lining piece (the rigid lining 3-2) into the head section rod and reserving a margin (preferably 3-5 mm) in place;
S50, plugging the head section rod which is lined with the reinforced lining piece (the rigid lining 3-2) into the cavity;
S60, the head end of the tail section rod is plugged into the cavity, then the tail section rod is turned to enable the first external thread and the first internal thread to be screwed and fixed, when the second external thread 2-111 and the second internal thread 1-11 of the extension pipe 2-11 are screwed in place, the unidirectional blocking teeth 2-121 are blocked by the unidirectional blocking grooves 1-13 to limit the second external thread 2-111 and the second internal thread 1-11 of the extension pipe 2-11 to be reversely screwed and loosened, and meanwhile the extension pipe 2-11 abuts against the reinforced lining piece (the rigid lining 3-2) and enables the reinforced lining piece to be positioned.
Embodiment IV, the present embodiment is substantially the same as embodiment one, two or three, except that:
Referring to fig. 16-17, in this embodiment, a reinforcing liner is provided on the inner wall of the head section bore 1-1.
In this embodiment, the reinforcing liner employs a rigid flight 3-1. The rigid spiral sheet 3-1 is screwed into the inner wall of the head section inner hole 1-1 of the head section rod 1 to form a spiral support, the installation is convenient, and meanwhile, the rigid spiral sheet 3-1 is clamped after being screwed in a spiral manner, so that the axial looseness is avoided, and meanwhile, the drainage function of the first radial hole 1-3 is not influenced.
The rigid screw 3-1 may be made of titanium alloy or other known materials that provide sufficient rigidity and can be implanted into bone.
The inner hole of the rigid spiral sheet 3-1 is equal to the inner hole of the rigid lining 3-2. When the second external thread 2-111 of the extension pipe 2-11 is screwed into the second internal thread 1-11 to be locked, the rigid spiral sheet 3-1 is extruded to move axially inwards and abut outwards, so that the rigid spiral sheet 3-1 is prevented from sliding outwards.
The using method of the femoral head necrosis support rod of the embodiment can comprise the following steps:
s10, drilling holes on the femur necrosis part by using a bone drill to obtain a cavity;
S20, cleaning up the necrotic part in the cavity by using a curet;
s30, tapping the outer end of the cavity by using a screw tap to obtain a first internal thread with the length of 25-35mm;
s40, screwing the reinforced lining piece (the rigid spiral sheet 3-1) into the head section rod and reserving a margin (preferably 3-5 mm) in place;
S50, plugging the head section rod which is lined with the reinforced lining piece (the rigid spiral sheet 3-1) into a cavity;
s60, the head end of the tail section rod is plugged into the cavity, then the tail section rod is turned to enable the first external thread and the first internal thread to be screwed and fixed, when the second external thread 2-111 of the extension pipe 2-11 and the second internal thread 1-11 are screwed in place, the unidirectional blocking teeth 2-121 are blocked by the unidirectional blocking grooves 1-13 to limit the second external thread 2-111 of the extension pipe 2-11 and the second internal thread 1-11 to be reversely screwed and loosened, and meanwhile the extension pipe 2-11 abuts against the reinforced lining piece (the rigid spiral piece 3-1) and enables the reinforced lining piece to be positioned.
The foregoing describes in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations can be made in accordance with the concepts of the invention by one of ordinary skill in the art without undue burden. Therefore, all technical solutions which can be obtained by logic analysis, reasoning or limited experiments based on the prior art by the person skilled in the art according to the inventive concept shall be within the scope of protection defined by the claims.