Acetabular Reamer Tool Holder With Spring-Biased Lock Pin
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Solution Overview
Problem
Current acetabular reamer instruments lack an efficient mechanism for quick and easy connection and disconnection from a rotary drive system, which is essential for incremental reaming during hip replacement surgeries to prevent excessive heat generation and allow for precise verification of bone conditions and implant orientation.
Innovation Solution
A tool holder with radially extending mounting elements and a spring-biased lock pin mechanism that securely engages and disengages with a drive shaft, enabling quick connection and disconnection of reaming instruments, allowing for easy switching between different reamers and ensuring precise alignment and sizing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a traditional connection mechanism is used for acetabular reamers, then the reamer can be securely held during reaming, but the connection and disconnection process becomes time-consuming and complex
Solution Approach 1:
The connection mechanism is divided into separate functional components: a drive shaft with external threading, a holder with internal threading and grooves, and a locking mechanism. This segmentation allows each component to be optimized independently and facilitates quick assembly and disassembly during surgery.
Solution Approach 2:
The connection mechanism transitions from a static, permanently fixed design to a dynamic, quickly adjustable system. The holder can rapidly transition between locked and unlocked states, enabling surgeons to quickly change reamers during incremental reaming procedures without complex operations.
2Reliability
If incremental reaming is performed with multiple reamers, then heat generation is reduced and precision is improved, but the frequency of connection and disconnection operations increases
Solution Approach 1:
The holder is pre-configured with grooves and locking mechanisms that anticipate the need for quick reamer changes. The design prepares the connection interface in advance, allowing surgeons to perform incremental reaming with multiple reamers without sacrificing time, as each reamer can be quickly secured and released when needed.
3Device complexity
If a simple connection mechanism is used, then the device complexity is reduced, but the security and reliability of the reamer connection may be compromised
Solution Approach 1:
The connection mechanism incorporates self-aligning grooves and self-locking features that automatically ensure proper engagement when the reamer is inserted. The grooves guide the reamer into the correct position, and the locking mechanism automatically secures it, eliminating the need for complex manual alignment procedures while maintaining connection reliability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Facilitates rapid and secure attachment and detachment of reaming tools, enabling efficient incremental reaming and precise bone preparation during hip replacement surgeries, reducing heat generation and improving surgical precision.
Implementation Method 1
A spring biased lock pin is slidably mounted in each bore of the head portion. Preferably the spring is a coil spring however any elastic element which can bias the lock pin within the bore can be utilized.
Data Source
AI summary
A tool holder releasably coupling a surgical tool such as a reaming tool to a drive shaft which tool has radially extending mounting elements. The holder includes a head portion coupled to an end of the drive shaft, the head portion having a body with an outwardly open groove extending thereacross for receiving the radially extending mounting elements on the tool. The mounting elements may be in the form of rods adapted to be received within the groove which rods extend across a base of the tool. The head portion includes a bore extending through the body in communication with the groove. A biased lock pin is slidably mounted in the bore of the head portion and is biased into a position whereby the locked pin engages the rod and locks it in place. A spring-biased lock collar is provided having stop surfaces thereon for engaging two stop surfaces on the lock pin a first locking the lock pin in the locked position and a second maintaining the lock pin in the open position.