Angled Reamer Spindle for Minimally Invasive Hip Surgery

Solution Overview

Problem

Traditional hip replacement surgeries involve extensive muscle dissection, leading to longer recovery times and increased trauma, making them unsuitable for minimally invasive approaches where smaller instruments are required.

Innovation Solution

A reamer spindle with an elongate housing and angled neck design, allowing for angled articulation and reduced muscle trauma, is developed for minimally invasive hip replacement surgeries, featuring a rotatable shaft and a reamer head with a surface configured to cut bone, and is designed for efficient use in MIS procedures.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If traditional open surgical approach is used, then surgical precision and effectiveness are maintained, but muscle trauma increases and recovery time extends

Engineering Contradiction:

Improvemuscle traumaVSAvoidrecovery time

Core Design Contradiction:

Object-affected harmful factorsVSLoss of time

Solution Approach 1:

The reamer spindle is divided into distinct segments: an elongate housing portion for insertion through a small incision, and a separate reamer head that can be attached and removed. This segmentation allows the main body to access the surgical site minimally invasively while the functional head performs the bone cutting task, reducing overall muscle trauma compared to traditional open approaches.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The reamer spindle transitions from a straight configuration to an angled configuration (35-65 degrees), adding angular dimensionality to the instrument design. This angular orientation allows the reamer to approach the acetabulum from a different trajectory, enabling access through smaller incisions and reduced muscle dissection while maintaining surgical precision.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Adaptability or versatility

If traditional straight reamer spindle is used, then manufacturing simplicity is maintained, but adaptability to minimally invasive approaches is limited

Engineering Contradiction:

Improveadaptability to MIS approachesVSAvoidspindle structure complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The reamer spindle is divided into distinct segments: an elongate housing portion for insertion through a small incision, and a separate reamer head that can be attached and removed. This segmentation allows the main body to access the surgical site minimally invasively while the functional head performs the bone cutting task, reducing overall muscle trauma compared to traditional open approaches.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The reamer spindle transitions from a straight configuration to an angled configuration (35-65 degrees), adding angular dimensionality to the instrument design. This angular orientation allows the reamer to approach the acetabulum from a different trajectory, enabling access through smaller incisions and reduced muscle dissection while maintaining surgical precision.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Object-affected harmful factors

If smaller instruments are used for MIS approaches, then muscle trauma is reduced, but instrument functionality and power transmission may be compromised

Engineering Contradiction:

Improvemuscle traumaVSAvoidfunctional effectiveness

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The reamer spindle is divided into distinct segments: an elongate housing portion for insertion through a small incision, and a separate reamer head that can be attached and removed. This segmentation allows the main body to access the surgical site minimally invasively while the functional head performs the bone cutting task, reducing overall muscle trauma compared to traditional open approaches.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The reamer head acts as an intermediary component that can be detachably connected to the elongate housing portion. This intermediary design allows the lightweight, small-diameter housing to serve as a delivery mechanism while the separate reamer head provides the necessary cutting functionality, ensuring both minimal trauma and functional effectiveness.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS8480674B1Angled reamer spindle for minimally invasive hip replacement surgery

Publication Date: 2013.07.09 VIANT AS&O HLDG LLC

AI summary

A reamer for use in minimally invasive hip replacement surgical approaches is provided. The reamer spindle includes an elongate housing portion that extends along a first axis and a neck or distal portion that extends along a second axis, wherein the second axis extends at an angle of between about 35 degrees and about 65 degrees relative to the first axis. A reamer head is removably connectable to the distal neck portion and has a surface configured to cut bone.