Intramedullary implant screw selection device

Patent metadata

Field	Value
Publication number	US-2021282883-A1
Application number	US-202117198972-A
Country	US
Kind code	A1
Filing date	Mar 11, 2021
Priority date	Mar 12, 2020
Publication date	Sep 16, 2021
Grant date	—

Abstract

The present disclosure provides a medical device and method to determine proper implant screw sizing for inserting within the intramedullary canal of a patient's bone. The medical device includes a radiolucent base that includes radiopaque markings indicative of an implant screw. The markings therefore appear on a radiographic image taken of the provided medical device. The markings may include first diameter markings and length markings, and may also include second diameter markings. The first and second diameter markings may be indicative of a major and minor diameter of an implant screw, respectively. The markings may also include an indication of a type or model of implant screw. In some instances, the medical device may include multiple sets of markings. In such instances, each set of markings is indicative of a different implant screw.

First claim

The invention is claimed as follows:

1 . A medical device comprising:
a base component constructed of a radiolucent material; and a set of markings on the base component, the set of markings including: (i) first diameter markings indicative of a first diameter of an implant screw, (ii) second diameter markings indicative of a second diameter of the implant screw, wherein the second diameter markings are between the first diameter markings on the base component, and (iii) a plurality of length markings indicative of a plurality of length options of the implant screw, wherein the set of markings are composed of a radiopaque material.

2 . The medical device of claim 1 , wherein the first diameter of the implant screw corresponds to a major diameter of a thread of the implant screw.

3 . The medical device of claim 1 , wherein the second diameter of the implant screw corresponds to a minor diameter of a thread of the implant screw.

4 . The medical device of claim 1 , wherein the implant screw that the set of markings are indicative of is adapted to be placed within an intramedullary canal of at least one of a metacarpal, phalange, metatarsal, radius, ulna, fibula, carpal, or tarsal bone of a patient.

5 . The medical device of claim 1 , wherein the implant screw that the set of markings are indicative of is adapted to be placed within an intramedullary canal of a radius bone of a patient.

6 . The medical device of claim 1 , wherein the radiolucent material is at least one of the materials selected from the group consisting of Polyether ether ketone (PEEK), acetal, ABS, nylon, carbon fiber, and polycarbonate.

7 . The medical device of claim 1 , wherein the radiopaque material is at least one of the materials selected from the group consisting of barium sulfate, bismuth, tungsten, stainless steel, titanium, cobalt chrome, and radiopaque inks.

8 . A medical device comprising:
a base component constructed of a radiolucent material; and a plurality of sets of markings on the base component, wherein each set of markings is indicative of a respective implant screw of a plurality of implant screws, wherein each set of markings includes first diameter markings indicative of a first diameter of the respective implant screw and a plurality of length markings indicative of a plurality of length options of the respective implant screw, and wherein the plurality of sets of markings are composed of a radiopaque material.

9 . The medical device of claim 8 , wherein each set of markings further includes second diameter markings indicative of a second diameter of the respective implant screw, and wherein the second diameter markings are between the first diameter markings on the base component.

10 . The medical device of claim 8 , wherein each implant screw of the plurality of implant screws that the plurality of sets of markings are indicative of is adapted to be placed within an intramedullary canal of at least one of a metacarpal, phalange, metatarsal, radius, ulna, fibula, carpal, or tarsal bone of a patient.

11 . The medical device of claim 8 , wherein each implant screw of the plurality of implant screws that the plurality of sets of markings are indicative of is adapted to be placed within an intramedullary canal of a radius bone of a patient.

12 . The medical device of claim 8 , wherein the plurality of sets of markings includes two or three sets of markings.

13 . A method comprising:
positioning a medical device relative to a bone of a patient, wherein the medical device includes:
a base component constructed of a radiolucent material; and
a set of markings on the base component, the set of markings including: (i) first diameter markings indicative of a first diameter of an implant screw, (ii) second diameter markings indicative of a second diameter of the implant screw, wherein the second diameter markings are between the first diameter markings on the base component, and (iii) a plurality of length markings indicative of a plurality of length options of the implant screw,
wherein the set of markings are composed of a radiopaque material;
exposing an area of the patient to radiation to generate a radiographic image, wherein the area of the patient includes the bone and the positioned medical device, and wherein the generated radiographic image includes a reproduction of the set of markings; and determining a desired diameter and a desired length of the implant screw based on the radiographic image.

14 . The method of claim 13 , wherein positioning the medical device relative to the bone of the patient includes positioning medical device external to a top side or a bottom side of a hand of the patient.

15 . The method of claim 14 , wherein the radiographic image is a first radiographic image, and wherein the medical device is positioned relative to the top side of the hand of the patient when exposing the area of the patient to radiation to generate the first radiographic image, the method further comprising:
positioning the medical device relative to the bottom side of the hand of the patient; and exposing the area of the patient with the medical device positioned relative to the bottom side of the hand to radiation to generate a second radiographic image that includes a reproduction of the set of markings, wherein determining the desired diameter and the desired length of the implant screw is based on both the first and second radiographic images.

16 . The method of claim 13 , wherein the first diameter markings correspond to a major diameter of a thread of the implant screw, and the second diameter markings correspond to a minor diameter of the thread of the implant screw.

17 . The method of claim 16 , wherein determining the desired diameter and the desired length of the implant screw based on the first radiographic image includes: (i) comparing the reproduction of the first diameter markings to an image of an intramedullary canal of the bone on the first radiographic image, (ii) comparing the reproduction of the second diameter markings to the image of the intramedullary canal, and (iii) comparing the reproduction of the plurality of length markings to the image of the intramedullary canal.

18 . The method of claim 17 , wherein comparing the reproduction of the first diameter markings to the image of the intramedullary canal includes determining whether the first diameter markings extend beyond the intramedullary canal.

19 . The method of claim 17 , wherein comparing the reproduction of the second diameter markings to the image of the intramedullary canal includes determining whether the second diameter markings extend beyond the intramedullary canal.

20 . The method of claim 13 , wherein the radiographic image is a first radiographic image, wherein the medical device includes a plurality of sets of markings, each set of markings corresponding to an implant screw of a different diameter, and wherein positioning the medical device relative to the bone of the patient includes positioning a first set of markings of the plurality of sets of markings over the bone, the method further comprising:
after exposing the area of the patient to radiation to generate the first radiographic image, repositioning the medical device relative to the bone of the patient such that a second set of markings different than the first set of markings is positioned over the bone; and exposing the area of the patient to radiation to generate a second radiographic image, wherein the second radiographic im

Assignees

• Acumed Llc

Inventors

• Conley Brian

Classifications

• A61B2090/061

  for measuring dimensions, e.g. length · CPC title

• A61B2090/3966

  Radiopaque markers visible in an X-ray image · CPC title

• A61B90/06 Primary

  Measuring instruments not otherwise provided for · CPC title

• A61B17/8645

  Headless screws, e.g. ligament interference screws · CPC title

• A61B17/7291

  for small bones, e.g. in the foot, ankle, hand or wrist · CPC title