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The LDPE 18F Guiding Sheath serves as a core access-establishing device in minimally invasive interventional diagnostic and therapeutic procedures. Fabricated primarily from **medical-grade Low-Density Polyethylene (LDPE)** and sized at 18 French (18F), its fundamental function is to create a stable, low-trauma operational conduit—extending from the body surface to the target internal cavity or blood vessel—for the passage of endoscopes and interventional instruments. It constitutes a critical medical consumable for departments such as Urology, Vascular Intervention, and Digestive Endoscopy, and is predominantly designed for single-use, sterile application.
| Specification (Fr) | OD (mm) | ID (mm) | Common length (cm) | Cone length (mm) | Main materials | Surface treatment | Typical application scenarios |
|---|---|---|---|---|---|---|---|
| 6Fr | 2.0 | 1.0 | 10 / 13 | 10-15 | Medical PE/PP | Hydrophilic coating | Pediatric interventional procedures, delicate vascular puncture |
| 8Fr | 2.7 | 1.5 | 13 / 15 | 15-20 | Medical PE/PP | Hydrophilic coating | Peripheral vascular and ureteral guidance |
| 10Fr | 3.3 | 2.0 | 15 / 20 | 20-25 | Medical PE/PP | Hydrophilic coating | Percutaneous nephrolithotomy and biliary drainage |
| 12Fr | 4.0 | 2.5 | 20 / 25 | 25-30 | Medical PE/PP | Hydrophilic coating | Percutaneous nephrolithotomy and thoracic drainage |
| 14Fr | 4.7 | 3.0 | 25 / 30 | 30-35 | Medical PE/PP | Hydrophilic coating | Urology, Interventional Therapy |
| 16Fr | 5.3 | 3.5 | 30 / 35 | 35-40 | Medical PE/PP | Hydrophilic coating | Percutaneous nephrolithotomy, large instrument access |
| 18Fr | 6.0 | 4.0 | 35 / 40 | 40-45 | Medical PE/PP | Hydrophilic coating | Complex cavity dilation and endoscopic surgery |
| 20Fr | 6.7 | 4.5 | 40 / 45 | 45-50 | Medical PE/PP | Hydrophilic coating | Large cavity, special interventional surgery |
The complete LDPE 18F guide sheath assembly comprises two core functional components, which can be paired with compatible consumables as needed:
The main body of the guide sheath consists of an LDPE sheath tube, a matching sheath seat (including a sealing valve, suction port, and venting push button), a sheath cap, and a silicone sealing sleeve. The sheath tube is the core passage for instrument operation. The one-way sealing valve prevents intraoperative blood/fluid reflux and avoids air embolism. The suction and venting ports enable intraoperative irrigation and negative pressure suction to maintain a clear surgical field.
Dilator assembly: The core is a dilator catheter made of pure LDPE material, along with a dilator seat and locking buckle. The catheter tip has a tapered gradient design, allowing it to enter the puncture channel first along the guidewire, gradually dilating the tissue. Combined with the sheath, this completes the establishment of a painless and low-damage access, reducing complications such as tissue tearing and bleeding.
Optional consumables include: compatible puncture needles, guide wires, hemostatic accessories, extension tubes, etc.
Minimally invasive and low-damage: The access is established through percutaneous or natural orifice puncture, which is an alternative to traditional open surgery. It is less traumatic, has less intraoperative bleeding, and the patient has a shorter postoperative recovery period.
Safe and controllable operation: The soft and smooth LDPE material and tapered expansion tip enable progressive tissue expansion, significantly reducing the risk of complications such as mucosal tearing and vascular perforation during channel establishment; the fully sealed design can reduce the risk of intraoperative fluid loss and air embolism.
High instrument compatibility: The 18F large inner diameter specification is compatible with a variety of endoscopes and interventional instruments, facilitating instrument exchange during the operation and effectively shortening the operation time; the disposable sterile design completely avoids cross-infection and meets the requirements of hospital infection control.
