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Positioning instrument for high-speed trochlear shaped subchondral bone abrasive drilling

A subchondral bone and locator technology, applied in bone drill guidance, medical science, surgery, etc., can solve problems such as inability to complete trochlea forming, poor control of uniformity, damage to articular cartilage, etc., and achieve light weight, comprehensive mechanical Good performance and balanced force effect

Inactive Publication Date: 2018-03-23
DALIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the distance between the grinding wheel grinding head and the articular surface is not well controlled during grinding, it is easy to cause uneven grinding: excessive grinding will make the thickness of the subchondral bone too thin, and the cartilage cannot be attached and damage the articular cartilage; too little grinding will Excessive thickness of subchondral bone to complete trochlear shaping
During the grinding process, the grasp of the distance between the grinding head and the articular surface, the magnitude of the applied force, the control of the grinding amount and the uniformity of grinding are all controlled by the doctor's experience. Difficult to grasp, time-consuming and labor-intensive problems

Method used

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  • Positioning instrument for high-speed trochlear shaped subchondral bone abrasive drilling
  • Positioning instrument for high-speed trochlear shaped subchondral bone abrasive drilling
  • Positioning instrument for high-speed trochlear shaped subchondral bone abrasive drilling

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A positioner for high-speed grinding and drilling of subchondral bone formed by a pulley, comprising: a sleeve 1, a force arm 2, a cylindrical guide block 3, a round head guide stud 4, a lock nut A5, a lock nut B6, a round head clamp Fixing screw A7, round head fastening screw B8 and round head fastening screw C9, one end of the described moment arm 2 is fixedly connected with the described sleeve 1, and the other end of the described moment arm 2 is fixed with the described cylindrical guide block 3 connection, the round head guide stud 4 passes through the lock nut A5, the cylindrical guide block 3 and the lock nut B6 respectively, and the round head fastening screw A7, the round head fastening screw B8 and the round head fastening screw B8 are installed on the sleeve 1 head fastening screw C9.

[0038] The round-head fastening screw A7 is installed under the sleeve 1, the round-head fastening screw B8 and the round-head fastening screw C9 are installed on both sides ...

Embodiment 2

[0053] Embodiment 1 is explained and supplemented, the principle of the present invention is, under the premise of not changing the shape, size and basic functions of the high-speed grinding drill used in hospital orthopedic surgery, it can be installed (disassembled) and limited along the horizontal axis, radially Force clamping, conical (column) surface positioning, adjust the distance between the high-speed grinding and drilling grinding head M-4 and the round head guide stud 4 hemispherical head along the vertical axis, thread fastening and laser welding, manual tightening ( release).

[0054] The developed positioner for high-speed grinding and drilling of subchondral bone with pulley forming has the advantages of simple structure, reasonable positioning, firm clamping, convenient disassembly and assembly, light and corrosion-resistant, safe and reliable, and the distance between the grinding head and the hemispherical head of the guide stud is convenient. adjustment feat...

Embodiment 3

[0065] When applied to specific operations, surgical requirements: patients with recurrent patellar dislocation caused by trochlear dysplasia (type B trochlear), need to undergo trochlear forming subchondral bone surgery, during the operation, high-speed grinding drills are used for subchondral bone grinding, grinding When the grinding wheel grinding head and the articular surface should maintain a distance of 4mm.

[0066] The steps to use the locator are as follows:

[0067] (1) Install high-speed grinding drill with positioner

[0068] a. The two sides of the holding force arm 2 are parallel to the two sides of the small cone in the middle of the high-speed grinding drill M and are parallel to the triangular plane M-2. Put the sleeve 1 axially on the front part of the high-speed grinding drill M with the installed grinding head and stick to the large tapered surface M-1 in the middle of the high-speed grinding drill.

[0069] b. Manually turn fastening screws 8, 9, and 7 ...

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Abstract

The invention discloses a positioning instrument for a high-speed trochlear shaped subchondral bone abrasive drilling and belongs to the field of auxiliary devices of medicinal instruments. Accordingto the technical scheme, the positioning instrument comprises a sleeve, a force arm, a columnar guide block and a round-end guide stud, wherein one end of the force arm is fixedly connected with the sleeve; the other end of the force arm is fixedly connected with the columnar guide block; the round-end guide stud penetrates through the columnar guide block. The positioning instrument has the beneficial effects that the grinding precision and the grinding uniformity of subchondral bone are effectively ensured, the operation process is simplified, operation difficulties are reduced, the operation time is shortened, and the operation effect is improved.

Description

[0001] This application is a divisional application with application number 201710054505X, application date January 24, 2017, and the title of the invention "a positioner for high-speed grinding and drilling of pulley-shaped subchondral bone and its use method". technical field [0002] The invention relates to the design and manufacture of an additional device for a special medical instrument for orthopedic clinical operations, in particular to a positioning device and a use method for high-speed grinding and drilling of subchondral bone formed by a pulley. Background technique [0003] The causes of patellar joint dislocation mainly include abnormal bone structure, soft tissue injury or abnormality, and poor function of surrounding muscles. The most important factor is abnormal bony structure, such as poor improvement of femoral trochlea, high patella, knee extensor device, and poor line. Femoral trochlear dysplasia means that the patient's femoral trochlea does not develo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B17/17
CPCA61B17/17A61B17/1732A61B17/1764
Inventor 吴蒙华王卫明
Owner DALIAN UNIV
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