NL2027360B1 - Hip implant - Google Patents
Hip implant Download PDFInfo
- Publication number
- NL2027360B1 NL2027360B1 NL2027360A NL2027360A NL2027360B1 NL 2027360 B1 NL2027360 B1 NL 2027360B1 NL 2027360 A NL2027360 A NL 2027360A NL 2027360 A NL2027360 A NL 2027360A NL 2027360 B1 NL2027360 B1 NL 2027360B1
- Authority
- NL
- Netherlands
- Prior art keywords
- stem
- neck
- head
- hip implant
- implant according
- Prior art date
Links
- 239000007943 implant Substances 0.000 title claims abstract description 46
- 210000001624 hip Anatomy 0.000 claims abstract description 41
- 210000004394 hip joint Anatomy 0.000 claims abstract description 10
- 210000000689 upper leg Anatomy 0.000 claims abstract description 6
- 210000000588 acetabulum Anatomy 0.000 claims abstract description 5
- 210000003049 pelvic bone Anatomy 0.000 claims abstract description 5
- 230000004888 barrier function Effects 0.000 claims description 8
- 125000006850 spacer group Chemical group 0.000 claims description 4
- 239000012858 resilient material Substances 0.000 claims description 2
- 239000007788 liquid Substances 0.000 claims 1
- 210000000988 bone and bone Anatomy 0.000 abstract description 4
- 239000011797 cavity material Substances 0.000 description 8
- 238000005259 measurement Methods 0.000 description 7
- 239000000306 component Substances 0.000 description 4
- 230000007246 mechanism Effects 0.000 description 4
- 239000012530 fluid Substances 0.000 description 3
- 210000002414 leg Anatomy 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000001356 surgical procedure Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 210000003484 anatomy Anatomy 0.000 description 1
- 238000011882 arthroplasty Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- JZCCFEFSEZPSOG-UHFFFAOYSA-L copper(II) sulfate pentahydrate Chemical compound O.O.O.O.O.[Cu+2].[O-]S([O-])(=O)=O JZCCFEFSEZPSOG-UHFFFAOYSA-L 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000000399 orthopedic effect Effects 0.000 description 1
- 230000001954 sterilising effect Effects 0.000 description 1
- 238000004659 sterilization and disinfection Methods 0.000 description 1
- 238000011541 total hip replacement Methods 0.000 description 1
Classifications
-
- 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
- A61F2/32—Joints for the hip
- A61F2/36—Femoral heads ; Femoral endoprostheses
- A61F2/3609—Femoral heads or necks; Connections of endoprosthetic heads or necks to endoprosthetic femoral 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
- A61F2/32—Joints for the hip
-
- 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
- A61F2/32—Joints for the hip
- A61F2/36—Femoral heads ; Femoral endoprostheses
- A61F2/3609—Femoral heads or necks; Connections of endoprosthetic heads or necks to endoprosthetic femoral shafts
- A61F2002/365—Connections of heads to necks
-
- 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
- A61F2/46—Special tools for implanting artificial joints
- A61F2/4657—Measuring instruments used for implanting artificial joints
- A61F2002/4666—Measuring instruments used for implanting artificial joints for measuring force, pressure or mechanical tension
Landscapes
- Health & Medical Sciences (AREA)
- Orthopedic Medicine & Surgery (AREA)
- Cardiology (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Transplantation (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Vascular Medicine (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Prostheses (AREA)
Abstract
Hip implant (1) comprising a stem (2) to be connected to a patient’s femur bone and a temporary head (4) removably connectable to a neck (5) of the stem (2) for placement of the head (4) in an acetabulum of a pelvic bone to form a hip joint, and wherein the neck (5) of the stem (2) is provided with a sensor device (6) which is protectively placed within a cavity of the temporary head (4) for measuring forces acting on the neck (5) of the stem (2).
Description
Hip implant The invention relates to a hip implant comprising a stem to be connected to a patient's femur bone and a temporary head removably connectable to a neck of the stem for placement of the head in an acetabulum of a pelvic bone to form a hip joint.
Such an hip implant is known from US2013/0197656.
Us2013/0197656 discloses that during some orthopedic surgeries a provisional component may be used to test a partic- ular orthopedic-implant geometry. For example, during total hip arthroplasty or total hip replacement surgery, a stem is im- planted into the femur of the patient and one or more provi- sional femoral heads are fitted to the stem in order to deter- mine geometric parameters that provide an acceptable fit with the patient's anatomy. Each provisional head can provide for a particular leg length, a particular lateral offset between the center of the femoral head and the center of the femur, and a particular version angle. A tray of provisional heads can be provided wherein each provisional head corresponds to a model of permanent head.
After fitting a provisional head to the stem, the hip geometry of the provisional head and the patient's range of mo- tion can be tested to determine if the geometry of the provi- sional head provides for a desirable fit. If the fit is unsat- isfactory another provisional head can be taken from the tray followed by repeat testing of the patient's hip geometry and range of motion. This process is repeated until an acceptable fit is achieved.
To reduce the complexity of this known procedure US2013/0197656 proposes one or more control mechanisms for ad- justing one or more geometric parameters of a provisional com- ponent of the hip implant, such as patient leg length, lateral offset, or version angle for an artificial hip component.
In an example, each control mechanism comprises a me- chanical mechanism capable of physically moving the provisional component in order to change one or more geometric parameters, such as a servo motor or a jack screw. The control mechanisms are located within a provisional head.
According to the invention a hip implant is proposed with the features of one or more of the appended claims.
In one aspect of the invention the neck of the stem is provided with a sensor device which is protectively placed within a cavity of the temporary head for measuring forces act- ing on the neck of the stem.
The sensor device can be used to measure the forces acting on the artificial hip joint, which information can be used to improve the characteristics of a definite head replac- ing the temporary head for the final hip joint of the patient.
Preferably the neck of the stem is provided with mul- tiple sensors to measure forces acting on the neck of the stem in three mutually orthogonal directions.
It is further advantageous that for measuring forces in an XY plane perpendicular to the neck of the stem, three sensors are provided which are regularly distributed enclosing an 120° angle between any two sensors.
A problem with known force sensors that can be used for measuring the forces acting on an artificial hip joint is that conventional strain gauges cannot be used in view of its requirement to be integrally construed with the hip joint, which hinders its application because cleaning and steriliza- tion is virtually impossible without damaging the construction of the force sensors. A viable solution is that the sensor or sensors are Hall sensors, wherein a magnet or magnets cooperat- ing with the Hall sensors are placed in the head. The skilled person understands that the size of the magnet in front of the sensor should be chosen large enough and the maximum compres- sion to which the hip implant is subjected to remain small enough, so that the magnet stays aligned to the sensor when force is applied on the implant, so this does not significantly affect the accuracy of the reading because the magnet will not move too far away from the sensor.
It is further preferred that the neck of the stem is provided with an inertial measurement unit. The measurements provided by the inertial measurement unit can be combined with the measurements of the force sensors to provide additional in- formation on the functionality and load conditions of the arti- ficial hip joint.
40 To prevent undesirable rotation of the neck of the stem with respect to the head, it is preferred that the stem and a cavity of the head for snugly receiving the stem are shaped correspondingly, wherein a cross-section of said cavity is one selected from the group comprising a circle, a triangle, a square or any other suitable shape.
Preferably the head is provided with an barrier-ring snugly fitting around the neck of the stem to provide a fluid barrier so as to protect the sensor or sensors and ancillary electronics provided on the neck of the stem below the head.
Suitably the barrier-ring is made from a resilient ma- terial.
It is desirable that the barrier-ring of the head fol- lows a perimeter that is tailored to the shape of the neck of the stem, to optimize the close fit of the barrier-ring around the neck of the stem. Accordingly the barrier-ring and the pe- rimeter may be shaped as one selected from the group comprising a circle, a triangle, a square or any other suitable shape.
It is preferred that the perimeter is shaped as a tri- angle with rounded corners matching the shape of the neck of the stem so as to lock the head in a desired orientation of the head with respect to the neck of the stem. This is particularly advisable with the application of the above mentioned Hall sen- sors mounted on the neck of the stem, which sensors for a prop- er operation have to be perfectly oriented with respect to the magnets in the head.
In order to tailor the hip implant to the physical di- mensions of the patient it is preferable that the neck of the stem can be provided with an offset spacer with preselected di- mensions.
The invention will hereinafter be further elucidated with reference to the drawing of an exemplary embodiment of a hip implant according to the invention, and some parts thereof, that is not limiting as to the appended claims.
In the drawing: -figure 1 shows a hip implant; -figure 2 shows a temporary head for the implant of figure 1; -figure 3 shows a neck of a stem of the implant of figure 1 provided with a sensor device; and 40 -figure 4 shows the sensor device of figure 3.
Whenever in the figures the same reference numerals are applied, these numerals refer to the same parts.
With reference first to figure 1 a hip implant 1 is depicted comprising a stem 2 to be connected to a patient’s fe- mur bone, and a permanent head 3.
When the hip implant 1 is placed with a patient, in- stead of the permanent head 3, initially a temporary head 4 which is shown in figure 2 is placed on the neck 5 of the stem
2. Accordingly the head 4 is removably connectable to the neck 5 of the stem 2 to carry out measurements as will be clarified hereinafter. The temporary head 4, and later the permanent head 3 can be placed in an acetabulum of a pelvic bone to form a hip joint of the patient.
In the detail view of figure 3 the neck 5 is shown separate from the remainder of the stem 2 of the implant, and this figure 3 further shows that the neck 5 is provided with a sensor device 6. When the temporary head 4 is placed on the neck 5 of the stem 2, the sensor device 6 is protectively placed within a cavity of the temporary head 4 so that it can be used for measuring forces acting on the neck 5 of the stem
2.
Preferably the sensor device 6 provided on the neck 5 of the stem 2 comprises multiple sensors to measure forces act- ing on the neck 5 of the stem 2 in three mutually orthogonal directions.
It is further remarked that in a preferable embodiment for measuring forces in an XY plane perpendicular to the neck 5 of the stem 2, three sensors are provided which are regularly distributed enclosing an 120° angle between any two sensors.
Figure 4 shows a detail of the sensor device 6, showing cavi- ties 7, 7’ for receiving sensors, preferably Hall sensors, whereas a magnet or magnets cooperating with the Hall sensors are placed in the head 4 fitting over the sensor device 6.
With reference again to figure 3 it is depicted that the neck 5 of the stem 2 is provided with an inertial measure- ment unit 8.
In figures 2 and 4 an barrier-ring 9 is shown that forms part of the head 4 and which snugly fits around the neck 5 of the stem 2 to provide a fluid barrier so as to protect the 40 sensor device 6 with its sensor or sensors and ancillary elec-
tronics provided on the neck 5 of the stem 2 below the tempo- rary head 4. The barrier-ring 9 is preferably made from a re- silient material.
As may be best seen in figure 2 the barrier-ring 9 of 5 the head 4 follows a perimeter that is tailored to the shape of the neck 5 of the stem 2. The perimeter is shaped as a triangle with rounded corners matching the shape of the neck 5 of the stem 2 so as to lock the head 4 in a desired orientation of the head 4 with respect to the neck 5 of the stem 2.
Finally figure 3 shows that the neck 5 of the stem 2 can be provided with an offset spacer 10 with preselected di- mensions to match the implant hello Jonathan with the physical dimensions of the patient that will receive the implant.
Although the invention has been discussed in the fore- going with reference to an exemplary embodiment of the hip im- plant of the invention, the invention is not restricted to this particular embodiment which can be varied in many ways without departing from the invention. The discussed exemplary embodi- ment shall therefore not be used to construe the appended claims strictly in accordance therewith. On the contrary the embodiment is merely intended to explain the wording of the ap- pended claims without intent to limit the claims to this exem- plary embodiment. The scope of protection of the invention shall therefore be construed in accordance with the appended claims only, wherein a possible ambiguity in the wording of the claims shall be resolved using this exemplary embodiment.
Aspects of the invention are itemized in the following section.
1. Hip implant (1) comprising a stem (2) to be connected to a patient's femur bone and a temporary head (4) removably con- nectable to a neck (5) of the stem (2) for placement of the head (4) in an acetabulum of a pelvic bone to form a hip joint, wherein the implant (1) is provided with a sensor device (86), characterized in that the neck (5) of the stem (2) is provided with the sensor device (6) which is protectively placed within a cavity of the temporary head (4) for measuring forces acting on the neck (5) of the stem (2).
2. Hip implant according to claim 1, characterized in that the sensor device (6) provided on the neck (5) of the stem (2) com- 40 prises multiple sensors to measure forces acting on the neck
(5) of the stem (2) in three mutually orthogonal directions.
3. Hip implant according to claim 1 or 2, characterized in that for measuring forces in an XY plane perpendicular to the neck (5) of the stem (2) three sensors are provided which are regu- larly distributed enclosing an 120° angle between any two sen- 50S.
4. Hip implant according to any one of claims 1 - 3, character- ized in that the sensor or sensors are Hall sensors, wherein a magnet or magnets cooperating with the Hall sensors are placed in the head (4).
5. Hip implant according to any one of claims 1 - 4, character- ized in that the neck (5) of the stem (2) is provided with an inertial measurement unit (8).
6. Hip implants according to any one of claims 1 - 5, charac- terized in that the stem (2) and a cavity of the head for snug- ly receiving the stem (2) are shaped correspondingly, wherein a cross-section of said cavity is one selected from the group comprising a circle, a triangle, a square or any other suitable shape.
7. Hip implant according to any one of claims 1 - 6, character- ized in that the head (4) is provided with a barrier-ring (9) snugly fitting around the neck (5) of the stem (2) to provide a fluid barrier so as to protect the sensor or sensors and ancil- lary electronics provided on the neck (5) of the stem (2) below the head (4).
8. Hip implant according to claim 7, characterized in that the barrier-ring (9) is made from a resilient material.
9. Hip implant according to any one of claims 7 or 8, charac- terized in that the barrier-ring (9) of the head (4) follows a perimeter that is tailored to the shape of the neck (5) of the stem (2).
10. Hip implant according to any one of claims 7 - 9, charac- terized in that the barrier-ring (9) and the perimeter are shaped as one selected from the group comprising a circle, a triangle, a square or any other suitable shape.
11. Hip implant according to claim 9 or 10, characterized in that the perimeter is shaped as a triangle with rounded corners matching the shape of the neck (5) of the stem (2) so as to lock the head (4) in a desired orientation of the head (4) with 40 respect to the neck (5) of the stem (2).
:
12. Hip implant according to any one of claims 1 - 11, charac- terized in that the neck (5) of the stem (2) can be provided with an offset spacer (10) with preselected dimensions.
Claims (12)
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL2027360A NL2027360B1 (en) | 2021-01-21 | 2021-01-21 | Hip implant |
| PCT/NL2021/050759 WO2022158966A1 (en) | 2021-01-21 | 2021-12-13 | Hip implant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL2027360A NL2027360B1 (en) | 2021-01-21 | 2021-01-21 | Hip implant |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NL2027360B1 true NL2027360B1 (en) | 2022-07-28 |
Family
ID=74592682
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NL2027360A NL2027360B1 (en) | 2021-01-21 | 2021-01-21 | Hip implant |
Country Status (2)
| Country | Link |
|---|---|
| NL (1) | NL2027360B1 (en) |
| WO (1) | WO2022158966A1 (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050004680A1 (en) * | 2003-07-03 | 2005-01-06 | Joseph Saladino | Femoral head assembly with variable offset |
| US20130197656A1 (en) | 2012-02-01 | 2013-08-01 | Zimmer, Inc. | Adjustable provisional component of a medical device |
| WO2014071193A1 (en) * | 2012-11-02 | 2014-05-08 | Polaris Surgical Llc | Systems and methods for measuring orthopedic parameters in arthroplastic procedures |
| JP2016516489A (en) * | 2013-03-15 | 2016-06-09 | ウィリアム エル ハンター | Apparatus, system and method for monitoring hip replacements |
| KR20170058361A (en) * | 2014-07-10 | 2017-05-26 | 모하메드 라쉬완 마푸즈 | Bone reconstruction and orthopedic implants |
| US10660760B2 (en) * | 2016-11-02 | 2020-05-26 | Zimmer, Inc. | Device for sensing implant location and impingement |
| CN112190236A (en) * | 2014-09-17 | 2021-01-08 | 卡纳里医疗公司 | Devices, systems, and methods for using and monitoring medical devices |
-
2021
- 2021-01-21 NL NL2027360A patent/NL2027360B1/en not_active IP Right Cessation
- 2021-12-13 WO PCT/NL2021/050759 patent/WO2022158966A1/en not_active Ceased
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050004680A1 (en) * | 2003-07-03 | 2005-01-06 | Joseph Saladino | Femoral head assembly with variable offset |
| US20130197656A1 (en) | 2012-02-01 | 2013-08-01 | Zimmer, Inc. | Adjustable provisional component of a medical device |
| WO2014071193A1 (en) * | 2012-11-02 | 2014-05-08 | Polaris Surgical Llc | Systems and methods for measuring orthopedic parameters in arthroplastic procedures |
| JP2016516489A (en) * | 2013-03-15 | 2016-06-09 | ウィリアム エル ハンター | Apparatus, system and method for monitoring hip replacements |
| KR20170058361A (en) * | 2014-07-10 | 2017-05-26 | 모하메드 라쉬완 마푸즈 | Bone reconstruction and orthopedic implants |
| CN112190236A (en) * | 2014-09-17 | 2021-01-08 | 卡纳里医疗公司 | Devices, systems, and methods for using and monitoring medical devices |
| US10660760B2 (en) * | 2016-11-02 | 2020-05-26 | Zimmer, Inc. | Device for sensing implant location and impingement |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2022158966A1 (en) | 2022-07-28 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MM | Lapsed because of non-payment of the annual fee |
Effective date: 20240201 |