Method for forming a patient specific surgical guide mount
View Patent ↗A resection guide locator includes a bone engagement portion with surfaces that are complementary to the surface topographies of a bone to be resected during surgery. A housing includes a socket defined by a resilient annular wall that is sized and arranged so to accept a resection guide by press-fit to thereby position and hold the resection guide within the socket. The resection guide is maintained in a predetermined, preferred position while the surfaces are releasably locked in position on the bone. A method is disclosed for forming and using the resection guide locator.
1. A method comprising the steps of:
(A) generating an anatomically accurate image of a bone of a patient that includes surface topographies by scanning the bone in two scans using an imaging apparatus, each scan being of a separate region of the bone, wherein between said two scans the patient will move in order to reposition a coil of the imaging apparatus to cover a most proximal or a most distal region of interest of the bone;
(B) using a computer processor to convert said anatomically accurate image to a digital model;
(C) using the computer processor to add a digital representation of a resection guide locator to said digital model to form a composite digital model;
(D) using the computer processor to map one of said surface topologies complementarily onto a bone engagement portion of said digital representation of the resection guide locator to provide a customized digital representation of the resection guide locator; and
(E) manufacturing the resection guide locator based upon the customized digital representation of the resection guide locator such that the manufactured resection guide locator includes a complementary surface topology on a bone engagement portion and a receptacle pocket sized to receive a resection guide with a press-fit,
wherein the manufactured resection guide locator defines an elongate slot within the receptacle pocket, the elongate slot positioned within the receptacle pocket such that the elongate slot of the resection guide locator aligns with an elongate slot defined by the resection guide when the resection guide is received within the receptacle pocket.
2. The method of claim 1 further comprising setting the coil to at least one of a multiple array extremity coil and a rapid body coil in order to scan the bone in two scans.
3. The method of claim 1 wherein scanning the bone in two scans includes applying a pulse sequence to the coil of at least one of a FATSEP 3D RSSG and a 2D T1 FSE.
4. The method of claim 3 wherein scanning the bone in two scans includes a TR time of at least one of 61 milliseconds and 2700 milliseconds; and a TE time of at least one of 10 milliseconds and 28.5 milliseconds.
5. The method of claim 3 wherein scanning the bone into two scans includes using the imaging apparatus to provide a flip angle of 90°.
6. The method of claim 3 wherein scanning the bone in two scans includes using a matrix of at least one of 256 by 256 pixels and 512 by 512 pixels.
7. The method of claim 3 wherein scanning the bone in two scans includes performing at least one of the two scans with an acquisition time of at least one of 5:46 (min:sec) and 15:37 (min:sec).
8. A method comprising the steps of:
(A) generating an anatomically accurate image of a bone of a patient that includes surface topographies by scanning the bone in at least two scans using an imaging apparatus, each scan being of a separate region of the bone and at least partially overlapping one another, wherein between said at least two scans the patient will move in order to reposition a coil of the imaging apparatus to cover a most proximal or a most distal region of interest of the bone;
(B) using a computer processor to convert said anatomically accurate image to a digital model;
(C) using the computer processor to add a digital representation of a resection guide locator to said digital model to form a composite digital model;
(D) using the computer processor to map one of said surface topologies complementarily onto a bone engagement portion of said digital representation of the resection guide locator to provide a customized digital representation of the resection guide locator; and
(E) manufacturing the resection guide locator based upon said digital representation of the customized digital representation of the resection guide locator such that the manufactured resection guide locator includes a complementary surface topology on a bone engagement portion and a receptacle pocket sized to receive a resection guide therein with a press-fit,
wherein the manufactured resection guide locator defines an elongate slot within the receptacle pocket, the elongate slot positioned within the receptacle pocket such that the elongate slot of the resection guide locator aligns with an elongate slot defined by the resection guide when the resection guide is received within the receptacle pocket.
9. The method of claim 8 further comprising setting the coil to at least one of a multiple array extremity coil and a rapid body coil.
10. The method of claim 8 wherein scanning the bone in the at least two scans includes applying a pulse sequence to the coil of at least one of a FATSEP 3D RSSG and a 2D T1 FSE.
11. The method of claim 10 wherein scanning the bone in at least two scans includes a TR time of at least one of 61 milliseconds and 2700 milliseconds; and a TE time of at least one of 10 milliseconds and 28.5 milliseconds.
12. The method of claim 10 wherein scanning the bone into two scans includes using the imaging apparatus to provide a flip angle of 90°.
13. The method of claim 10 wherein scanning the bone in two scans includes using a matrix of at least one of 256 by 256 pixels and 512 by 512 pixels.
14. The method of claim 10 wherein scanning the bone in the at least two scans includes performing at least one of the two scans with an acquisition time of at least one of 5:46 (min:sec) and 15:37 (min:sec).
15. The method of claim 8 wherein a scan boundary of at least one of the at least two scans includes a proximal femoral head through a distal femur and a most proximal tibial point through a most distal tibial point of a patient's leg.
16. The method of claim 8 further comprising placing a patient's leg in the middle of the coil to ensure the largest field of view possible without distortion.
17. The method of claim 1 , wherein the manufactured resection guide locator includes a first pair of holes within the receptacle pocket that do not intersect with the elongate slot defined by the manufactured resection guide locator.
18. The method of claim 17 , wherein the first pair of holes defined by the manufactured resection guide locator align with a second pair of holes defined by the resection guide when the resection guide is received within the receptacle pocket.
19. The method of claim 8 , wherein the manufactured resection guide locator includes a first pair of holes within the receptacle pocket that do not intersect with the elongate slot defined by the manufactured resection guide locator, and wherein the first pair of holes defined by the manufactured resection guide locator align with a second pair of holes defined by the resection guide when the resection guide is received within the receptacle pocket.
20. The method of claim 1 , wherein the receptacle pocket is defined by a resilient wall configured to retain the cutting guide within the receptacle pocket.