Multi-perforated Cannula for Osteomyelitis Drainage
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Solution Overview
Problem
Existing treatments for osteomyelitis in long bones, such as CN113456924A and CN206482909U, are inefficient in removing contaminated tissues and fluids, leading to ineffective infection control, trauma, and complications like fluid leakage and wound sequestration.
Innovation Solution
A device comprising a multi-perforated cannula with alternating holes, covered with a hydrophobic sponge, is inserted into the bone canal using a metal guide. The device operates under negative pressure without irrigation, enhancing fluid removal and preventing infection perpetuation by retaining larger particles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate lavage and drainage structures are used, then the treatment can be performed, but it causes large trauma to the operation area and non-smooth drainage
Solution Approach 1:
The patent combines separate lavage and drainage functions into a single integrated cannula system. The cannula includes both a lavage lumen for fluid injection and a drainage lumen for fluid evacuation, eliminating the need for multiple separate devices and reducing surgical trauma while maintaining effective irrigation and drainage capabilities.
2Device complexity
If a single suction port is used in the distal end, then the device structure is simple, but the suction port can be easily occluded and drainage is insufficient
Solution Approach 1:
The drainage function is segmented into multiple independent suction ports distributed along the cannula surface rather than relying on a single port. This segmentation ensures that if one port becomes occluded, other ports remain functional, maintaining reliable drainage while keeping the overall structure relatively simple.
Solution Approach 2:
The suction ports are distributed in multiple dimensions along the cannula length and circumference, transitioning from a single-point suction to a distributed multi-dimensional suction system. This increases the effective drainage area and reduces the likelihood of complete occlusion.
3Reliability
If lavage liquid is introduced into the bone canal, then the contaminated area can be washed, but the liquid may leak and cause fluid leakage and wound sequestration
Solution Approach 1:
The lavage and drainage functions are merged into a single cannula system with coordinated lumens, allowing simultaneous irrigation and evacuation. This integration ensures that lavage liquid is immediately removed through the drainage lumen, preventing accumulation and leakage that could cause wound sequestration while maintaining effective contamination control.
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
The device effectively removes fluids and contaminated particles from the bone canal, reducing infection values and preventing biofilm formation, thus enhancing antibiotic efficacy and reducing the need for repeated treatments and hospital stays.
Implementation Method 1
by the action of the negative pressure, retains the larger particles preventing the infection from being perpetuated by sequestration within the bone canal
Implementation Method 2
turning on said suction pump; absorbing and transferring the fluid generated within said bone canal continuously to said external graduated container
Implementation Method 3
a multi-perforated plastic cannula with holes therein and having the exterior thereof covered with a sponge
Data Source
Figure 1~3
Figure 4~5B
AI summary
A procedure for the treatment of osteomyelitis in long bones comprising the steps of: - approaching the bone canal of a long bone either at its distal or proximal end through a wound made on a patient; - reaming said bone canal to a maximum diameter of approximately 12 mm (0.47 in) without affecting the cortical layer; - taking samples for culture; - cleaning and aspirating the contents of said bone canal; - inserting into said bone canal, a multi-perforated plastic cannula (1) with holes (2) therein by means of a metal guide (3) arranged inside and having the exterior thereof covered with a sponge (4); - removing said metal guide (3); - arranging an additional portion of sponge in said wound in such a way that one portion is placed deep in contact with said a multi-perforated plastic cannula (1) coated with a sponge (4), and another portion emerges from said wound; - partially closing said wound with sutures; - fixing a self-adherent absorption disc that includes an aspiration hose upon said additional portion of sponge emerging from said wound; - coating said wound with a self-adherent film to form a complete seal; - connecting by means of a connector said aspiration hose to a collection hose which is connected to an external graduated container; - connecting said external graduated container to a suction pump; - turning on said suction pump; - absorbing and transferring the fluid generated within said bone canal continuously to said external graduated container; - measuring the aspirated fluid; - carrying out the above steps three times every 48 hours; and - after the third time, completely removing said a multi-perforated plastic cannula covered with said sponge from said wound by re-reaming, washing, and taking cultures for laboratory testing. This invention also discloses a device for the treatment of osteomyelitis in long bones used in the procedure.