CN111297521A - Surface shoulder joint prosthesis - Google Patents
Surface shoulder joint prosthesis Download PDFInfo
- Publication number
- CN111297521A CN111297521A CN202010158151.5A CN202010158151A CN111297521A CN 111297521 A CN111297521 A CN 111297521A CN 202010158151 A CN202010158151 A CN 202010158151A CN 111297521 A CN111297521 A CN 111297521A
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- section
- prosthesis
- shoulder joint
- broach
- connecting rod
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- 210000000323 shoulder joint Anatomy 0.000 title claims abstract description 59
- 210000002758 humerus Anatomy 0.000 claims abstract description 55
- 210000004095 humeral head Anatomy 0.000 claims description 59
- 238000000576 coating method Methods 0.000 claims description 16
- 239000011248 coating agent Substances 0.000 claims description 15
- 230000007704 transition Effects 0.000 claims description 10
- 230000004323 axial length Effects 0.000 claims description 8
- 230000002093 peripheral effect Effects 0.000 claims description 4
- 230000007423 decrease Effects 0.000 claims description 3
- 230000001815 facial effect Effects 0.000 claims 2
- 210000000988 bone and bone Anatomy 0.000 description 17
- 239000007787 solid Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 239000002639 bone cement Substances 0.000 description 3
- 230000033001 locomotion Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- 230000012010 growth Effects 0.000 description 2
- 229910052588 hydroxylapatite Inorganic materials 0.000 description 2
- XYJRXVWERLGGKC-UHFFFAOYSA-D pentacalcium;hydroxide;triphosphate Chemical compound [OH-].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O XYJRXVWERLGGKC-UHFFFAOYSA-D 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 208000024891 symptom Diseases 0.000 description 2
- 239000010936 titanium Substances 0.000 description 2
- 229910052719 titanium Inorganic materials 0.000 description 2
- 206010005963 Bone formation increased Diseases 0.000 description 1
- 208000024288 Rotator Cuff injury Diseases 0.000 description 1
- 206010039227 Rotator cuff syndrome Diseases 0.000 description 1
- 208000034189 Sclerosis Diseases 0.000 description 1
- 230000008468 bone growth Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 210000005036 nerve Anatomy 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
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- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Images
Classifications
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/40—Joints for shoulders
- A61F2/4014—Humeral heads or necks; Connections of endoprosthetic heads or necks to endoprosthetic humeral shafts
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
- A61F2/30771—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/3094—Designing or manufacturing processes
- A61F2/30942—Designing or manufacturing processes for designing or making customized prostheses, e.g. using templates, CT or NMR scans, finite-element analysis or CAD-CAM techniques
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/40—Joints for shoulders
- A61F2/4081—Glenoid components, e.g. cups
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
- A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
- A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
- A61F2/30771—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves
- A61F2002/30772—Apertures or holes, e.g. of circular cross section
- A61F2002/30784—Plurality of holes
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/3094—Designing or manufacturing processes
- A61F2002/30985—Designing or manufacturing processes using three dimensional printing [3DP]
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/40—Joints for shoulders
- A61F2/4081—Glenoid components, e.g. cups
- A61F2002/4085—Glenoid components, e.g. cups having a convex shape, e.g. hemispherical heads
Landscapes
- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Transplantation (AREA)
- Biomedical Technology (AREA)
- Veterinary Medicine (AREA)
- Orthopedic Medicine & Surgery (AREA)
- Cardiology (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Public Health (AREA)
- General Health & Medical Sciences (AREA)
- Heart & Thoracic Surgery (AREA)
- Vascular Medicine (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Geometry (AREA)
- Prostheses (AREA)
Abstract
The invention belongs to the field of medical instruments and discloses a surface shoulder joint prosthesis which comprises a humerus head prosthesis matched with the shape of a humerus head of a human body, a connecting rod formed on the inner surface of the humerus head prosthesis and a broach detachably connected with the connecting rod, wherein an external thread section is formed on the connecting rod, an internal thread section matched with the external thread section and a first hollow section communicated with the tail end of the internal thread section are formed on the broach, and the external thread section of the connecting rod rotates to enter the first hollow section through the internal thread section and is accommodated and fixed in the first hollow section. The surface shoulder joint prosthesis can be firmly fixed with humerus bone of a human body, has good stability and wide applicability.
Description
Technical Field
The invention belongs to the technical field of medical instruments, and particularly relates to a surface shoulder joint prosthesis.
Background
The conventional artificial shoulder joint replacement includes two major types, i.e., humeral head replacement and artificial total shoulder joint replacement, in which the whole humeral head is removed and a prosthesis is installed, while the surface shoulder joint replacement only grinds off a part of the humeral head and a surface shoulder joint prosthesis adapted to the shape of the humeral head is fitted over the remaining part of the humeral head.
When the humerus head prosthesis is used, firstly, bone on the outer layer of the humerus head is removed, a hole for installing the broach is formed on the humerus head, the broach of the surface shoulder joint prosthesis is aligned with the hole on the humerus head, and external force is applied to the prosthesis to enable the inner surface of the humerus head prosthesis to be in contact with the outer surface of the humerus head of a human body in a fitting manner, so that installation is completed. In order to ensure the fixing effect, bone cement can be arranged in the hole on the humerus head, so that the humerus head can be conveniently fixed with human humerus bone.
Although the existing surface shoulder joint prosthesis can meet the requirements of patients, in practical use, the broach and the humerus of a human body are in taper press fit, the prosthesis has the risk of taper press fit failure when being implanted into the human body and used for a long time, and once the taper press fit failure, the prosthesis can be free in the human body and the nerve cutting situation can occur. Meanwhile, the humerus head prosthesis and the broach are integrally formed, so that the humerus head prosthesis or the broach is easy to have the phenomenon that the size of the humerus head prosthesis or the broach is not suitable for the same patient.
In view of the defects of the prior art surface shoulder joint prosthesis, those skilled in the art would like to provide a surface shoulder joint prosthesis which is firmly fixed to the humeral head bone of the human body, has good stability and is widely applicable.
Disclosure of Invention
The invention aims to provide a surface shoulder joint prosthesis which is firmly fixed with the bone of a humerus head of a human body, has good stability and wide applicability.
The surface shoulder joint prosthesis comprises a humerus head prosthesis matched with the shape of a humerus head of a human body, a connecting rod formed on the inner surface of the humerus head prosthesis, and a broach detachably connected with the connecting rod, wherein an external thread section is formed on the connecting rod, an internal thread section matched with the external thread section and a first hollow section communicated with the tail end of the internal thread section are formed on the broach, and the external thread section of the connecting rod is rotated to enter the first hollow section through the internal thread section and is accommodated and fixed in the first hollow section.
Furthermore, a second hollow section communicated with the head end of the internal thread section is formed on the intramedullary nail, and a cone matching section positioned between the external thread section and the inner surface of the humeral head prosthesis is formed on the connecting rod, wherein after the external thread section of the connecting rod passes through the internal thread section through the second hollow section and enters the first hollow section, the cone matching section is pressed in the second hollow section.
Further, the outer circumferential wall of the conical section and/or the inner circumferential wall of the second hollow section are/is configured as a rough surface.
Further, an external threaded section is formed at the free end of the connecting rod, and the axial length of the external threaded section is less than or equal to the axial length of the first hollow section.
Further, the tapered section has an outer diameter dimension that gradually decreases from a first end proximate the inner surface of the humeral head prosthesis toward a second end distal from the inner surface of the humeral head prosthesis.
Furthermore, a transition section positioned between the external thread section and the conical section is formed on the connecting rod, the outer diameter of the transition section is smaller than that of the external thread section, and the outer diameter of the transition section is smaller than that of the second end.
Furthermore, a plurality of longitudinal ribs distributed circumferentially are formed on the outer surface of the broach.
Furthermore, the upper part of the outer surface of the broach is formed with an HA + TI coating, and the middle-lower part of the outer surface of the broach is formed with a porous three-dimensional structure layer.
Further, the inner surface of the humeral head prosthesis is formed with an HA + TI coating.
Further, the inner surface of the humeral head prosthesis is formed with a plurality of anti-rotation protrusions.
Preferably, the plurality of rotation prevention protrusions are arranged in a cone shape and uniformly distributed, and the axes of the rotation prevention protrusions form an included angle with the diameter direction of the humeral head prosthesis.
Compared with the prior art, the surface shoulder joint prosthesis has the following advantages:
1) the humerus head prosthesis and the medullary needle of the surface shoulder joint prosthesis are detachably arranged, so that the specifications of the humerus head prosthesis and the medullary needle which are most suitable for patients can be selected according to the sizes of the humerus heads of different patients, and the surface shoulder joint prosthesis has wide applicability. Meanwhile, the surface shoulder joint prosthesis realizes the fixed connection of the humerus head prosthesis and the intramedullary nail by the matching of the external thread section penetrating through the internal thread section and the first hollow section, namely after the surface shoulder joint prosthesis is installed, the external thread section and the internal thread section do not keep thread matching but are positioned in the first hollow section, and the arrangement can prevent the occurrence of the condition that the external thread section and the internal thread section keep thread matching to generate matching loosening in the motion process of the surface shoulder joint prosthesis, thereby effectively avoiding the loosening of the humerus head prosthesis and the intramedullary nail and ensuring that the surface shoulder joint prosthesis has better fixing effect.
2) The second hollow section communicated with the head end of the internal thread section is formed on the intramedullary nail, and the conical matching section positioned between the external thread section and the inner surface of the humeral head prosthesis is formed on the connecting rod, so that the humeral head prosthesis and the intramedullary nail have a pressing matching fixing mode of the conical matching section and the second hollow section besides a mode of matching and fixing the external thread section and the first hollow section, further the humeral head prosthesis and the intramedullary nail are prevented from loosening, and the surface shoulder joint prosthesis has a better fixing effect.
3) The HA + TI coating is formed on the upper part of the outer surface of the broach, and the porous three-dimensional structure layer is formed on the middle lower part of the outer surface of the broach, so that the outer surface of the broach is in a rough structure, and human bone is easy to be fused into and grow on the outer surface of the broach.
4) The inner surface of the humerus head prosthesis is provided with a plurality of conical and evenly distributed anti-rotation protrusions, and the anti-rotation protrusions are configured to form an included angle between the axis of the anti-rotation protrusions and the diameter direction of the humerus head prosthesis, so that after the humerus head prosthesis is connected with the humerus head of a human body, the anti-rotation protrusions can be inserted into the surface of the humerus head of the human body to prevent the humerus head prosthesis from rotating relative to the humerus head of the human body.
Drawings
FIG. 1 is a cross-sectional view of a surface shoulder joint prosthesis according to the present invention;
FIG. 2 is a schematic structural view of a first embodiment of the humeral head prosthesis shown in FIG. 1;
FIG. 3 is a cross-sectional view of the humeral head prosthesis shown in FIG. 2;
FIG. 4 is a schematic structural view of a first embodiment of the intramedullary needle shown in FIG. 1;
FIG. 5 is a schematic structural view of a second embodiment of the intramedullary nail according to the present invention;
fig. 6 is a schematic structural view of a second embodiment of a humeral head prosthesis according to the present invention.
Detailed Description
For a better understanding of the objects, structure and function of the invention, the surface shoulder joint prosthesis of the present invention will be described in further detail below with reference to the accompanying drawings.
Fig. 1 shows the structure of a superficial shoulder joint prosthesis 100 according to the present invention, comprising a humeral head prosthesis 1 fitted to the shape of a humeral head of a human body, a connecting rod 11 formed on the inner surface of the humeral head prosthesis 1, and a broach 2 detachably connected to the connecting rod 11, wherein an external threaded section 111 is formed on the connecting rod 11, an internal threaded section 23 fitted to the external threaded section 111 and a first hollow section 21 communicating with the end of the internal threaded section 23 are formed on the broach 2, and the external threaded section 111 of the connecting rod 11 is rotated through the internal threaded section 23 into the first hollow section 21 and is accommodated and fixed in the first hollow section 21.
When the surface shoulder joint prosthesis 100 of the present invention is used, bone on the surface of a humerus head of a human body is removed in advance, and a hole for inserting the broach 2 is formed on the surface of the humerus head of the human body, when the surface shoulder joint prosthesis 100 of the first embodiment of the present invention is installed, firstly, the humerus head prosthesis 1 and the broach 2 of corresponding specifications are selected according to the size of the humerus head of a patient, the connecting rod 11 is aligned with the broach 2, the external thread section 11 of the connecting rod 11 is screwed into the first hollow section 21 through the internal thread section 23 of the broach 2, and is fixed in the first hollow section 21, so that the humerus head prosthesis 1 and the broach 2 are connected together. Then, the broach 2 is aligned with a hole which is opened on the surface of the humerus head of the human body in advance, external force is applied to the humerus head prosthesis 1, the broach 2 gradually penetrates into the hole until the inner side surface of the humerus head prosthesis 1 is attached to the surface of the humerus head of the human body, and at the moment, the surface shoulder joint prosthesis 100 is well fixed with the humerus head of the human body.
It should be noted that, the existing surface shoulder joint prosthesis is generally formed integrally, that is, the broach and the humeral head prosthesis are not detachable, although the surface shoulder joint prosthesis has different specifications, the sizes of the humeral head prosthesis and the broach of the surface shoulder joint prosthesis of any specification are fixed and invariable, in practical application, only one of the humeral head prosthesis and the broach of the surface shoulder joint prosthesis of the same specification can be adapted to a patient, so that after the surface shoulder joint prosthesis is normally installed, the surface shoulder joint prosthesis is easy to loose, and the later recovery and the service life of the surface shoulder joint prosthesis are affected. The humerus head prosthesis 1 and the medullary needle 2 are detachably arranged, so that the specifications of the humerus head prosthesis 1 and the medullary needle 2 which are most suitable for patients can be selected according to the sizes of the humerus heads of different patients, and the humerus head prosthesis has wide applicability. Meanwhile, the surface shoulder joint prosthesis 100 of the present invention realizes the fixed connection of the humeral head prosthesis 1 and the intramedullary nail 2 by the external thread section 111 passing through the internal thread section 23 and the first hollow section 21, that is, after the surface shoulder joint prosthesis 1 is installed, the external thread section 111 and the internal thread section 23 do not maintain the thread fit, but are positioned in the first hollow section 21, such an arrangement can prevent the occurrence of the loose fit of the external thread section 111 and the internal thread section 23 due to the thread fit of the external thread section 111 and the internal thread section 23 during the movement of the surface shoulder joint prosthesis 100, thereby effectively avoiding the loosening of the humeral head prosthesis 1 and the intramedullary nail 2, and enabling the surface shoulder joint prosthesis 100 of the present invention to have a better fixing effect.
According to the present invention of the surface shoulder joint prosthesis 100, the intramedullary nail 2 may further be formed with a second hollow section 22 communicating with the head end of the internal thread section 23, and the connecting rod 11 may further be formed with a tapered section 112 located between the external thread section 111 and the inner surface of the humeral head prosthesis 1, wherein the tapered section 112 may be press-fitted into the second hollow section 22 after the external thread section 111 of the connecting rod 11 passes through the internal thread section 23 through the second hollow section 22 into the first hollow section 21. In this case, the process of connecting the humeral head prosthesis 1 with the intramedullary nail 2 will be: the connecting rod 11 of the humeral head prosthesis 1 is aligned with the intramedullary nail 2, and the external threaded section 111 of the connecting rod 11 sequentially enters the second hollow section 22, the internal threaded section 23, and the first hollow section 21 and is fixed in the first hollow section 21, and in this process, the taper fitting section 112 gradually enters the second hollow section 22 and is press-fitted in the second hollow section 22. Through the arrangement, the humeral head prosthesis 1 and the intramedullary nail 2 have a press-fit fixing mode of the conical section and the second hollow section 22 besides a mode of matching and fixing the external thread section 111 and the first hollow section 21, and further the looseness between the humeral head prosthesis 1 and the intramedullary nail 2 is avoided, so that the surface shoulder joint prosthesis 100 of the invention has better fixing effect.
According to the surface shoulder joint prosthesis 100 of the present invention, the outer circumferential wall of the tapered section 112 and/or the inner circumferential wall of the second hollow section 22 may be configured as a rough surface. Due to the fact that the conical section 112 is in press fit with the second hollow section 22, the conical section 112 is not prone to falling out of the second hollow section 22 after the conical section 112 is in press fit with the second hollow section 22. In another embodiment, the outer peripheral wall of the tapered section 112 and/or the inner peripheral wall of the second hollow section 22 may also be smooth, so that a more accurate fit can be achieved.
In the embodiment shown in fig. 2, the male screw section 111 may be formed at the free end of the connecting rod 11, and the axial length of the male screw section 111 may be equal to or less than the axial length of the first hollow section 21. It should be noted that in the present embodiment, the external thread section 111 is matched with the first hollow section 21 and the external thread section 111 is fixed in the first hollow section 21, so that the axial length of the external thread 111 is less than or equal to the axial length of the first hollow section 21, which ensures that the external thread section 111 can be screwed into the first hollow section 21 and that the matching between the first hollow section 21 and the external thread section 111 meets the requirement of stable connection between the humeral head prosthesis 1 and the intramedullary nail 2.
Referring to fig. 2 and 3, the tapered section 112 can have an outer diameter dimension that gradually decreases from a first end F near the inner surface C of the humeral head prosthesis 1 toward a second end G distal from the inner surface C of the humeral head prosthesis 1. Make awl join in marriage section 112 and its contact surface when progressively compressing with second hollow section 22 through this setting and increase gradually, increase the stability of structure, the compressive stress that produces when the patient normally moves the shoulder joint in the future can make the prosthesis tighter and tighter simultaneously, guarantees the stability of surperficial shoulder joint prosthesis.
As shown in fig. 1 and 2, the connecting rod 11 may further have a transition section 113 formed thereon between the external threaded section 111 and the tapered section 112, the outer diameter of the transition section 113 may be smaller than the outer diameter of the external threaded section 111, and the outer diameter of the transition section 113 may be smaller than the outer diameter of the second end G. Since the external thread section 111 and the first hollow section 21 and the taper fitting section 112 and the second hollow section 22 are fitted together as the coupling between the humeral head prosthesis 1 and the intramedullary nail 2 in the present embodiment, the above arrangement enables the transition section 113 to stably couple the external thread section 111 and the taper fitting section 112 while the transition section 113 is not caught by the second hollow section 22 and the internal thread section 23 when the external thread section 111 is screwed into the first hollow section 21 of the intramedullary nail 2.
In one embodiment of the intramedullary nail 2, as shown in fig. 4, the outer surface of the intramedullary nail 2 may be further formed with a plurality of longitudinal ribs 24 distributed circumferentially. By this arrangement, rotation of the broach 2 after insertion into the humeral head of the human body is avoided, preventing dislocation of the superficial shoulder joint prosthesis 100.
As shown in fig. 4, the upper part a of the outer surface of the broach 2 may be formed with an HA + TI coating (hydroxyapatite and pure titanium mixed coating) 25, and the lower middle part B of the outer surface of the broach 2 may be formed with a porous three-dimensional structure layer 26. The HA + TI coating and the porous three-dimensional structure layer 26 of the broach 2 according to the present invention are formed on the surface of the solid structure of the broach 2, wherein the upper portion of the broach 2 is formed with the second hollow section 22, the internal threaded section 23 and the first hollow section 21, so that the upper portion of the outer surface of the broach 2 HAs a pore structure consisting of the second hollow section 22, the internal threaded section 23 and the first hollow section 21, and is not a completely closed solid structure, while the middle and lower portions of the broach 2 are a completely closed solid structure, and the connection rod 11 is connected with the broach 2 by the incompletely closed solid structure, so that the structure is a stressed position, which requires high strength. In the prior art, a method of spraying a TI coating (pure titanium coating) on the surface of a prosthesis is often adopted to improve the performance of bone fusion, however, TI is an inert metal, lacks bone induction capability, cannot form chemical bonding with bone when contacting with the physiological environment of a human body, and cannot promote the growth of new bone. In the embodiment, the HA (hydroxyapatite) + TI coating 25 is formed on the upper part of the outer surface of the broach 2, so that the upper part of the outer surface of the broach 2 HAs a rough outer surface, human bone can be attached to the HA + TI coating 25 to grow, and in addition, the HA is a main inorganic composition of the human bone and HAs excellent bioactivity and bone conduction capability. Therefore, the HA + TI coating HAs good biocompatibility and bioactivity on one hand and higher bonding strength on the other hand. The porous three-dimensional structure layer 26 is similar to the porous structure of human bone, and may be, for example, a 3D printed trabecular bone structure, which facilitates growth of human bone. It should be noted that, since the porous three-dimensional structure layer is a porous structure and has low strength, the porous three-dimensional structure layer is arranged at the middle-lower part B of the outer surface of the intramedullary nail 2, i.e. the closed solid structure part, so as to ensure that the intramedullary nail 2 has high strength.
In the embodiment shown in fig. 2, the inner surface C of the humeral head prosthesis 1 can also be formed with an HA + TI coating. Since the inner surface C of the humeral head prosthesis 1 is in contact with the humeral head of the human body, the inner surface C of the humeral head prosthesis 1 is formed into a rough structure by this arrangement, which facilitates bone growth of the human body.
As shown in fig. 2, the inner surface C of the humeral head prosthesis 1 can also be formed with a plurality of anti-rotation protrusions 12. After the humerus head prosthesis 1 is connected with the humerus head of the human body through the arrangement, the anti-rotation protrusion 12 can be inserted into the surface of the humerus head of the human body to prevent the humerus head prosthesis 1 from rotating relative to the humerus head of the human body.
In the embodiment shown in fig. 3, the rotation preventing protrusions 12 may be arranged in a tapered shape and uniformly distributed, and the axes D of the rotation preventing protrusions 12 may form an included angle α with the diameter E of the humeral head prosthesis 1, by this arrangement, the axes D of the rotation preventing protrusions 12 form an included angle α with the diameter E of the humeral head prosthesis 1, so that the direction of the force applied to the humeral head of the human body by the rotation preventing protrusions (in the direction of the axes of the rotation preventing protrusions 12) and the direction of the force applied when the rotation occurs (in the direction perpendicular to the diameter E) are not collinear, thereby making the rotation preventing protrusions 12 hard to rotate after being inserted into the humeral head of the human body.
It should be noted that, in the surface shoulder joint prosthesis 100 according to the embodiment of the present invention, since the middle-lower portion B of the outer surface of the broach 2 HAs the porous three-dimensional mechanism layer 26, and the upper portion a of the outer surface of the broach 2 and the inner surface C of the humeral head prosthesis 1 have HA + TI coatings, it is ensured that the human bone and the surface shoulder joint prosthesis 100 are fused and grow well, and therefore, the fixation with bone cement is not required, and the bone cement falling off or the falling off together with the human bone due to the shoulder joint movement in the future can be avoided. However, since the cost of the broach according to the first embodiment is high in the prior art, the broach 2 according to the first embodiment is still relatively common in the case of using cement, and in this regard, the structure of the broach 2 according to the first embodiment shown in fig. 5 is also shown, and the broach 2 according to the present embodiment is different from the broach 2 according to the first embodiment shown in fig. 4 only in that the HA + TI coating 25 and the porous solid structure 26 are not provided on the outer surface.
Furthermore, it is still to be noted that for different patients with symptoms of humeral head, different treatments are required for different patients with human humeral head, thereby allowing the surface bone removed human humeral head to have different shapes. For example, in order to adapt to patients with tuberosity hyperosteogeny, sclerosis and rotator cuff injury, the coated humeral head prosthesis 1 of the embodiment shown in fig. 6 is required to increase the contactable range of the articular surface, and the coated humeral head prosthesis shown in fig. 6 is different from the humeral head prosthesis shown in fig. 2 only in the shape of the inner surface. It should be noted that the shape of the inner surface of the humeral head prosthesis 1 can be modified accordingly for different symptoms of the humeral head of the patient, and will not be described in detail herein.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. It is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (10)
1. A surface shoulder joint prosthesis is characterized by comprising a humerus head prosthesis matched with the shape of a humerus head of a human body, a connecting rod formed on the inner surface of the humerus head prosthesis, and a broach detachably connected with the connecting rod, wherein an external thread section is formed on the connecting rod, an internal thread section matched with the external thread section and a first hollow section communicated with the tail end of the internal thread section are formed on the broach, and the external thread section of the connecting rod rotates to enter the first hollow section through the internal thread section and is contained and fixed in the first hollow section.
2. The superficial shoulder joint prosthesis of claim 1, wherein the broach further has a second hollow section formed thereon communicating with a head end of the internal thread section, and the connecting rod further has a tapered section formed thereon between the external thread section and the inner surface of the humeral head prosthesis, wherein the tapered section is press-fitted into the second hollow section after the external thread section of the connecting rod passes through the internal thread section via the second hollow section into the first hollow section.
3. The surface shoulder joint prosthesis of claim 2, wherein the outer peripheral wall of the tapered section and/or the inner peripheral wall of the second hollow section is configured as a roughened surface.
4. The surface shoulder joint prosthesis of claim 2, wherein the externally threaded section is formed at a free end of the connecting rod, the externally threaded section having an axial length that is less than or equal to an axial length of the first hollow section.
5. The facial shoulder joint prosthesis of any one of claims 2-4, wherein the tapered section has an outer diameter dimension that gradually decreases from a first end proximal to the inner surface of the humeral head prosthesis toward a second end distal to the inner surface of the humeral head prosthesis.
6. The surface shoulder joint prosthesis of claim 5, wherein the connecting rod further defines a transition section therebetween, the transition section having an outer diameter dimension less than an outer diameter dimension of the outer threaded section and an outer diameter dimension less than an outer diameter dimension of the second end.
7. The surface shoulder joint prosthesis of any one of claims 1-4, wherein the outer surface of the broach is further formed with a plurality of circumferential longitudinal ribs.
8. The surface shoulder joint prosthesis of any one of claims 1-4, wherein an upper portion of the outer surface of the broach is formed with an HA + TI coating, and a middle-lower portion of the outer surface of the broach is formed with a porous three-dimensional structural layer.
9. The superficial shoulder joint prosthesis of any of claims 1-4, wherein the inner surface of the humeral head prosthesis is formed with an HA + TI coating.
10. The facial shoulder joint prosthesis of claim 9, wherein the inner surface of the humeral head prosthesis is further formed with a plurality of anti-rotation protrusions.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010158151.5A CN111297521A (en) | 2020-03-09 | 2020-03-09 | Surface shoulder joint prosthesis |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010158151.5A CN111297521A (en) | 2020-03-09 | 2020-03-09 | Surface shoulder joint prosthesis |
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| CN111297521A true CN111297521A (en) | 2020-06-19 |
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| CN202010158151.5A Pending CN111297521A (en) | 2020-03-09 | 2020-03-09 | Surface shoulder joint prosthesis |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112674911A (en) * | 2020-12-30 | 2021-04-20 | 北京爱康宜诚医疗器材有限公司 | Humerus prosthesis |
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| US20040193276A1 (en) * | 2003-03-31 | 2004-09-30 | Maroney Brian J. | Modular articulating surface replacement prosthesis |
| CN101352367A (en) * | 2007-07-26 | 2009-01-28 | 比德曼莫泰赫有限公司 | Fixation device for bones |
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