HIP REPLACEMENT NAVIGATION SYSTEM AND METHOD

• US 20160242934A1
• Filed: 03/10/2015
• Published: 08/25/2016
• Est. Priority Date: 02/20/2015
• Status: Active Grant

• Current Assignee: Orthalign, Inc.
• Original Assignee: Orthalign, Inc.
• Inventors: van der Walt, Nicholas, Nielsen, Jonathan
• Granted Patent: US 10,363,149 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: A61B 17/1746 for the acetabulum
• CPC Class Codes: A61B 2017/00477 Coupling A61B2017/0046 takes precedence
• CPC Class Codes: A61B 2017/568 produced with shape and dimensions specific for an individual patient
• CPC Class Codes: A61B 2034/2048 using an accelerometer or inertia sensor
• CPC Class Codes: A61B 2034/2068 using pointers, e.g. pointers having reference marks for determining coordinates of body points
• CPC Class Codes: A61B 2090/061 for measuring dimensions, e.g. length
• CPC Class Codes: A61B 2090/067 for measuring angles
• CPC Class Codes: A61B 2090/0811 for the position of a particular part of an instrument with respect to the rest of the instrument, e.g. position of the anvil of a stapling instrument
• CPC Class Codes: A61B 34/20 Surgical navigation systems; Devices for tracking or guiding surgical instruments, e.g. for frameless stereotaxis
• CPC Class Codes: A61B 90/30 Devices for illuminating a surgical field, the devices having an interrelation with other surgical devices or with a surgical procedure
• CPC Class Codes: A61F 2/34 Acetabular cups
• CPC Class Codes: A61F 2/3601 for replacing only the epiphyseal or metaphyseal parts of the femur, e.g. endoprosthetic femoral heads or necks directly fixed to the natural femur by internal fixation devices non-prosthetic internal fixation devices for the femoral head or neck A61B17/74
• CPC Class Codes: A61F 2/4609 of acetabular cups
• CPC Class Codes: A61F 2/4657 Measuring instruments used for implanting artificial joints for surgical instruments A61B90/06
• CPC Class Codes: A61F 2/4684 Trial or dummy prostheses
• CPC Class Codes: A61F 2002/4658 for measuring dimensions, e.g. length
• CPC Class Codes: A61F 2002/4668 for measuring angles
• CPC Class Codes: A61F 2002/4681 by applying mechanical shocks, e.g. by hammering

Abstract

A hip joint navigation system is provided that includes a base having at least one channel disposed therethrough for receiving a pin for mounting the base to the pelvis. A mount feature is disposed on a top surface. A registration jig is configured to couple with the base and to engage anatomical landmarks. In some aspects, a patient specific jig system for hip replacement is provided including an engagement surface formed to closely mate to acetabular bone contours of a specific patient and a registration feature configured to be in a pre-determined orientation relative to an acetabulum the patient when the jig is coupled with acetabular bone contours of the specific patient. In other aspects, methods of using the systems are provided.

Claims

1-36. -36. (canceled)

37. A patient specific method, comprising:

coupling a patient specific jig to a rim of an acetabulum;

registering the orientation of a proxy for a plane of the rim using an inertial sensor coupled with the patient specific jig;

removing the patient specific jig from the acetabulum;

orienting an acetabular shell in the acetabulum using an impactor and the inertial sensor, wherein during orienting, inertial data from the inertial sensor is used to confirm a proper orientation of the acetabular shell.

38. The patient specific method of claim 37, wherein the inertial sensor is a first inertial sensor and further comprising mounting a base on a pelvis adjacent to the acetabulum and coupling a second inertial sensor to the base, the second inertial sensor being fixed relative to the pelvis.

39. The patient specific method of claim 38, wherein the base is mounted at a location that is independent of the patient specific jig.

40. The patient specific method of claim 37, further comprising tracking motion of a pelvis adjacent to the acetabulum to eliminate error due to the movement of the pelvis.

42. The patient specific method of claim 38, further comprising coupling the first inertial sensor with the base to relate the orientation data of the first inertial sensor to a reference frame of the second inertial sensor.

43. The patient specific method of claim 38, wherein mounting the base comprises inserting a fixation pin through the patient specific jig along an axis disposed at a pre-defined angle.

44. The patient specific method of claim 38, wherein mounting the base comprises inserting at least two fixation pins through the patient specific jig along axes disposed at a pre-defined angle.

45. The patient specific method of claim 37, wherein registering includes coupling the inertial sensor with the impactor and coupling the impactor with the patient specific jig.

46. The patient specific method of claim 45, wherein registering includes coupling portion of the impactor with a registration feature of the patient specific jig at a specific pre-defined angular position.

47. The patient specific method of claim 45, wherein registering includes aligning the inertial sensor with an orientation symbol on the patient specific jig.

41. (canceled)

48. (canceled)

49. (canceled)

50. (canceled)

51. (canceled)

52. (canceled)

53. A method of performing a hip joint replacement procedure, comprising:

placing a patient in a position with a leg of the hip joint in an extended position;

mounting a laser projecting device to a pelvis adjacent to the hip joint;

projecting a laser light onto the leg and/or a foot of the leg to illuminate a portion of the leg and/or the foot away from the hip joint;

recording a position of an incidence of the laser light;

registering a portion of the femur adjacent to the hip joint;

replacing the hip joint with an artificial hip joint;

projecting the laser light onto the leg and/or the foot to confirm orientation of the femur relative to the pelvis to confirm leg length and/or joint offset,

registering the portion of the femur adjacent to the hip joint to confirm leg length and/or off-set.

54. The method of claim 53, further comprising mounting an articulated member to the pelvis and coupling the laser projecting device to the articulated member.

55. The method of claim 54, wherein the articulated member comprises a ball joint.

56. The method of claim 53, further comprising articulating the laser projecting device to direct the laser light onto a portion of the foot of the leg.

57. The method of claim 56, further comprising locking the laser projecting device in a fixed configuration and maintaining the fixed configuration while replacing the hip joint.

58. The method of claim 53, wherein recording comprises marking three points on the surface of the leg and/or the foot coincident with the laser light.

59. The method of claim 53, wherein recording comprises capturing a photographic image of the laser light and the leg and/or the foot.

60. The method of claim 53, wherein registering the portion of the femur comprises registering the femur at the greater trochanter.

63. The method of claim 53, wherein the laser projecting device is disposed in a housing including an inertial measurement unit.

61. (canceled)

62. (canceled)

64. A method of performing a hip joint replacement procedure, comprising:

mounting a laser projecting device to a pelvis adjacent to the hip joint;

registering a portion of a femur adjacent to the hip joint;

projecting a laser light from the laser projecting device onto a leg and/or a foot of the leg to confirm correspondence between a pre-operative orientation of the femur and the pelvis and a post-operative orientation of the femur and the pelvis; and

registering the portion of the femur adjacent to the hip joint to confirm leg length and/or joint off-set.