New R&D design

MIS | Technological Upgrade - Technological Advantages - Post-operative Results | czmeditech

The Minimally Invasive Spine System (MIS) is a state-of-the-art technology that enables precise treatment through tiny incisions for conditions such as herniated discs and spinal stenosis.

New design detail

Minimally invasive advantages

Minimized trauma

Small incision design:

Typical incisions are only 1-2 cm, reducing muscle stripping and soft tissue damage.

Precision positioning technology:

Improved accuracy of implant placement with intraoperative navigation (e.g. O-arm, 3D-C-arm) or robotic assistance (e.g. Mazor X, Globus Medical).

Reduced intraoperative bleeding:

minimally invasive access technology reduces the risk of vascular injury, especially for elderly or comorbid patients.

Faster postoperative recovery

Short hospital stay:

most patients are discharged 24-48 hours after surgery, compared to 3-5 days for traditional open surgery.

Early mobility:

Less pain and better muscle protection allow patients to return to their daily activities more quickly.

Biomechanical optimization

New material applications:

e.g. 3D printed titanium alloys, PEEK (polyether ether ketone) materials to achieve a modulus of elasticity close to that of bone and reduce stress masking.

Dynamic stabilization systems:

some implants (e.g. Dynesys, Coflex) preserve spinal mobility and reduce the risk of adjacent segment degeneration.

Expanded indications

Covering a wide range of spinal pathologies such as degenerative disc disease, lumbar spinal stenosis, mild spondylolisthesis and vertebral fractures.

临床案列

The following are representative research cases in recent years:

1. Randomized controlled trial of lumbar spine fusion (TLIF)

Study design:

prospective multicenter RCT (2022) comparing MIS-TLIF (minimally invasive) with open TLIF.

Sample size:

120 patients with single-segment degenerative lumbar spine disease.

Results:

Surgical time:

slightly longer in the MIS group (mean 150 min vs. 130 min), but 60% less bleeding (<100 ml vs. 250 ml).

Postoperative pain:

50% reduction in VAS scores 1 week postoperatively in the MIS group, no significant difference between the two groups after 3 months.

Fusion rate:

1 year postoperative CT showed >90% fusion rate in both groups.

Complications:

Infection rate 2% in MIS group vs. 8% in open group.

2. Long-term follow-up study of the dynamic stabilization system (Coflex)

Study design:

European 5-year follow-up study (2021) evaluating Coflex implantation for the treatment of lumbar spinal stenosis.

Sample size:

80 patients.

OUTCOME:

Functional improvement:

the ODI (dysfunction index) decreased from 45 points at baseline to 20 points at 5 years.

NEIGHBORING SECTION DEGRADATION:

Only 12% of patients developed adjacent segment problems, significantly lower than conventional fusion (~30%).

Reoperation rate:

cumulative 5-year reoperation rate of 8%, mainly due to implant loosening (4%) or symptomatic recurrence.

3. Multicenter study of robot-assisted MIS implants

Study design:

retrospective study published in 2023 to analyze the results of MIS screw placement with Mazor robotic assistance.

Sample size:

500 screw placements (thoracolumbar spine).

Results:

Precision:

98.6% of screw positions were satisfactory (Gertzbein-Robbins grading A/B).

Complications:

nerve root injury rate 0.4% compared to 3-5% for conventional freehand placement.

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