Bone Anchor Insertion Instrument With Adjustable Needle Positioning
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Solution Overview
Problem
Conventional bone anchor insertion procedures in surgery, such as those involving Jamshidi needles and K-wires, are time-consuming and require multiple instrument passes, especially when preparing multiple threaded bores.
Innovation Solution
An instrument that couples with a bone anchor insertion device, allowing for a needle to be adjusted in position relative to the bone anchor through a translational movement converted from rotational input, enabling efficient insertion and removal of the needle, compatible with different bone anchor lengths and types.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional bone anchor insertion procedures using Jamshidi needles and K-wires are used, then the bone anchor can be inserted into the bone, but the surgical procedure becomes time-consuming and requires multiple instrument passes
Solution Approach 1:
The patent combines the needle holder and bone anchor insertion device into a single integrated instrument. The needle holder is coupled to the drive shaft of the bone anchor insertion device, allowing both needle advancement and bone anchor insertion to be performed through one instrument rather than requiring separate instrument passes as in conventional procedures using Jamshidi needles and K-wires.
Solution Approach 2:
The integrated instrument serves multiple functions: it can hold and advance the needle to create a pilot hole, then subsequently hold and insert the bone anchor through the same instrument. This multi-functional design eliminates the need to switch between different specialized instruments during the surgical procedure.
2Adaptability or versatility
If the needle position is fixed relative to the bone anchor, then the instrument structure is simpler, but the instrument cannot accommodate different bone anchor lengths and types
Solution Approach 1:
The needle holder is designed to be movable with respect to the handle portion along the longitudinal axis. This dynamic positioning capability allows the needle to be adjusted to different positions relative to the bone anchor, enabling the instrument to accommodate various bone anchor lengths and types while maintaining a relatively simple overall structure.
Solution Approach 2:
The transmission member acts as an intermediary mechanism between the actuator and the needle holder. It converts the rotational movement of the actuator into translational movement of the needle holder, providing a controlled and adjustable positioning system that adds functionality without significantly complicating the instrument design.
3Measurement precision
If manual needle advancement is used, then the instrument is simpler without transmission mechanisms, but the needle position adjustment is less precise and efficient
Solution Approach 1:
The transmission member serves as a mechanical intermediary that translates rotational input from the actuator into precise linear displacement of the needle holder. This mechanism provides controlled and measurable position adjustment, improving needle placement accuracy compared to direct manual advancement.
Solution Approach 2:
The patent replaces direct manual needle advancement with a mechanical transmission system. The actuator and transmission member work together to convert rotational motion into precise linear motion, providing more accurate and efficient needle positioning than would be achievable through simple manual manipulation.
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 a reduction in surgical steps and enhances efficiency by allowing stepless adjustment of the needle position, making it suitable for minimally invasive surgery and compatible with various bone anchors, including self-cutting threads.
Implementation Method 1
The transmission member has a first advancement structure that is configured to engage a second advancement structure provided at the handle portion for effecting the translational movement of the needle holder
Data Source
AI summary
A surgical instrument is connectable to a bone anchor insertion device having a drive shaft that defines a coaxial channel for receiving a needle therethrough. The instrument includes a handle portion configured to be coupled to the drive shaft in a rotationally fixed manner to transmit torque to the drive shaft, a needle holder configured to hold a needle and movable axially relative to the handle portion, an actuator rotatable relative to the handle portion, and a transmission member connectable to the needle holder and movable axially relative to the actuator and comprising a first advancement surface engageable with a second advancement surface of the handle portion to convert rotational movement of the actuator into axial movement of the needle holder relative to the handle portion for axially advancing and retracting a needle held by the needle holder relative to the handle portion.