Recently, Kossel Medtech (Suzhou) Co., Ltd. received approval from the National Medical Products Administration (NMPA) for its independently developed Peripheral Thrombectomy Catheter (Registration No. 20253031757).
This product, together with the previously approved Medical Electric Suction Pump (Registration No. 20252141564), Disposable Suction Connection Tube (Registration No. 20252141452), Negative Pressure Collection Device (Registration No. 20252109), and the separator currently under registration, forms the “K-Rhino” Peripheral Thrombectomy System, designed for aspiration of thrombi in peripheral arteries and veins.
While the industry remains within the “comfort zone” of 8–12F, we chose to push the boundary. 14F is not a gamble on size—it is an exploration for greater efficiency in peripheral thrombectomy.
Why are existing aspiration catheters sometimes insufficient?
When the thrombus burden is high, the lesion is located distally, or the thrombus is highly adherent, do you ever find that with 8–10F catheters:
Aspiration feels inadequate?
Residual thrombus remains despite repeated attempts?
Thrombectomy is incomplete, time-consuming, with significant blood loss?
Catheter-directed thrombolysis becomes necessary afterward, carrying bleeding risks?
The root cause: Insufficient aspiration efficiency.
How to break through?
Two core factors determine aspiration efficiency:
Thrombus Removal Force: The catheter’s ability to capture thrombus
Thrombus Transport Capacity: The catheter’s ability to deliver thrombus through its lumen
1. Catheter Diameter Determines Thrombus Removal Force
Mechanical principle:
(F: thrombus removal force; P: pressure; R: catheter radius)
When the thrombus completely occludes the catheter tip, a larger catheter diameter generates a greater removal force, resulting in stronger aspiration power.
2. Catheter Diameter Determines Thrombus Transport Capacity
Mechanical principle: Hagen–Poiseuille’s Law
(Q: thrombus transport capacity; ΔP: pressure difference; R: catheter radius; η: viscosity; L: catheter length)
Thrombus transport capacity is directly proportional to catheter radius—the larger the diameter, the greater the transport efficiency.
In summary: The closer the catheter diameter is to the vessel diameter (without exceeding it), the higher the aspiration efficiency.
This is the rationale behind the 14F large-lumen aspiration concept, leading to the K-Rhino 14F Aspiration Catheter.
Three Key Facts About the 14F Aspiration Catheter
1. Deliverability
Is 14F too large for the iliac-femoral vein?
For peripheral thrombectomy, the catheter size should match the vessel diameter.
Common access: popliteal vein
popliteal vein diameter(4.5–7 mm), femoral vein (5–8 mm), iliac vein (8–12 mm).
14F catheter outer diameter: 4.66 mm—well within the vessel range and safely deliverable.
2. Blood Loss
With 14F, aspiration efficiency improves, residual thrombus is reduced, and procedure time shortens. Blood loss remains within a normal range.
Technique tip: When transparent tubing shows a sudden increase in blood flow, stop aspiration, reposition the catheter tip to the thrombus, then resume.
3. Safety
A soft distal tip minimizes vascular injury.
In Vitro Study
Objective: To analyze the correlation between catheter diameter, thrombus clearance rate, and blood loss.
Method: 8F, 10F, 12F, and 14F catheters were used to aspirate thrombi in a 7 cm iliac vein segment. Metrics: aspiration time, total blood loss, and catheter occlusion events.
Experimental Results
Experimental Conclusion
Compared with 8F, 10F, and 12F catheters, the 14F aspiration catheter demonstrated higher aspiration efficiency, lower total blood loss, and no catheter occlusion.
K-Rhino 14F Peripheral Thrombectomy Catheter
A new era of large-lumen aspiration begins.
Disclaimer: This article is an interpretation of a medical device product and aims to provide users with scientific and objective information. It does not constitute medical advice, diagnosis, or treatment recommendations. Clinical data and indications may evolve with ongoing research, and the company makes no guarantee of permanent validity. The cases, data, and study results cited herein are for knowledge sharing only and do not apply to all individuals. Outcomes may vary due to patient differences—please do not attempt imitation or self-diagnosis.