Spinal Pedicle Screw Set 5.5mm – Minimally Invasive Pedicle Screw-Rod Instrumentation

The Spinal Pedicle Screw Set 5.5mm from Peak Surgicals (2200-1301 series) is a 41-piece minimally invasive pedicle screw instrumentation set designed for the complete intraoperative workflow of MIS posterior spinal pedicle screw-rod fixation using a 5.5mm rod system — covering pedicle access with a Double-Head Probe (straight and bent), single-head probes, and an AWL; pedicle channel tapping across four diameters (φ4.5, φ5.5, φ6.5, φ7.5mm); polyaxial and monoaxial screw insertion with dedicated screwdrivers; rod contouring with a Rod Bender and Mould Rod; rod seating with a Rod Holding Forcep, Rod Pushing Forcep, Rod Pusher, and Rod Holder; in-situ rod bending with left and right In-situ Bending Irons; segmental compression and spreading; rod twist for deformity correction; crosslink placement with a Crosslink Screwdriver, Crosslink Nut Holder, and Crosslink Measurement gauge; a dedicated 5.5mm System Spinal Persuader with Sleeve; a 12 N.m Torque Wrench; Screw Cutter for Long Arm Screw with Counter Torque; four Ball-type and four Pillar-type Fixation Pins; a Screw Measurement gauge; a T-Handle Quick Coupling; Straight Ratchet Screwdriver; and an Aluminium Box. It is used by spine surgeons and neurosurgeons performing MIS or open posterior pedicle screw fixation for lumbar and thoracic spinal fusion, spinal stenosis with instability, spondylolisthesis, and spinal fracture stabilisation where the 5.5mm rod diameter is specified.

5.5mm Rod System and MIS Pedicle Screw Fixation: System Architecture

The 5.5mm rod diameter is the most commonly used rod size in minimally invasive posterior lumbar pedicle screw-rod fixation systems. In MIS pedicle screw surgery, the pedicle screws are placed percutaneously or through small muscle-splitting incisions using tubular retractors, and the rod is passed subcutaneously or through a small incision between the screw heads — a technique that requires the rod diameter and the screw tulip dimensions to be precisely matched to the rod-passing instruments and the tulip geometry. The 5.5mm Spinal Persuader (2200-1326) and Persuader Sleeve (2200-1325) in this set are specifically sized for the 5.5mm tulip-to-rod engagement used in this system: the Persuader sleeve engages the tulip extension arm of the pedicle screw, and the Persuader applies the controlled force to seat the 5.5mm rod into the tulip against tissue resistance or slight screw-rod trajectory mismatch. This set also includes the four tap sizes (φ4.5 to φ7.5mm) and both polyaxial and monoaxial screwdrivers needed for the full range of thoracic and lumbar pedicle screws used with 5.5mm rod systems, and the Screw Cutter for Long Arm Screw (2200-1309) trims the extended tulip arms of percutaneous screws after final set screw tightening.

Pedicle Access: Double-Head Probe, Single-Head Probe, AWL, and Four Taps

The Double-Head Probe (2200-1301) combines a straight pedicle probe on one end and a bent probe on the other, providing both trajectory options in a single instrument — reducing the instrument count during the pedicle preparation sequence. The Single-Head Probe Straight (2200-1302) provides a dedicated straight probe for levels or approaches where the double-head instrument is too bulky. The AWL (2200-1334) establishes the cortical entry point at the pedicle before the probe is advanced. The Pedicle Probe Straight (2200-1314) and Pedicle Probe Bent (2200-1315) are the primary pedicle channel preparation instruments for the straight and bent trajectories respectively. The four taps — φ4.5mm (2200-1303) for small thoracic pedicles, φ5.5mm (2200-1304) for standard lumbar pedicle screws, φ6.5mm (2200-1305) for large lumbar pedicle screws, and φ7.5mm (2200-1306) for maximum diameter screws in the ilium or large L4–L5 pedicles — cover the complete tap range required for thoracic, lumbar, and sacropelvic fixation using screw diameters matched to the 5.5mm rod system. The T-Handle Quick Coupling (2200-1332) provides the manual torque drive for all taps and other quick-connect instruments.

Rod Management: Mould Rod, Bender, In-situ Bending Irons, Twist, and Forceps

The rod management instruments address the challenge of contouring a 5.5mm rod to the patient's lumbar lordosis and passing it into the screw tulips through the limited access of MIS portals. The Mould Rod 200mm (2200-1307) is a malleable trial rod used to measure the required rod length and curvature by bending it to match the screw head positions intraoperatively and then using it as a template for contouring the definitive rod. The Rod Bender (2200-1335) contours the 5.5mm rod to the measured curvature ex situ before rod insertion. The In-situ Bending Iron L (2200-1312) and In-situ Bending Iron R (2200-1313) provide left-sided and right-sided in-situ rod bending capability after the rod is partially or fully seated, allowing minor sagittal alignment fine-tuning without rod removal. The Rod Twist (2200-1329) rotates the seated rod around its longitudinal axis as part of the deformity correction manoeuvre in cases where coronal plane correction is required. The Rod Holding Forcep (2200-1323) controls the rod during introduction. The Rod Pushing Forcep (2200-1324) and Rod Pusher (2200-1336) seat the rod into successive tulips. The Rod Holder (2200-1338) maintains rod position during tulip seating steps.

Fixation Pins, Crosslink System, Persuader, Torque Wrench, and Screw Cutter

The eight Fixation Pins — Ball-type ×4 (2200-1317 ×2 and 2200-1318 ×2) and Pillar-type ×4 (2200-1319 ×2 and 2200-1320 ×2) — are used to temporarily fix the rod in the tulip head at each screw level during the rod seating sequence and before the set screw is finally tightened, preventing the rod from backing out of seated tulips while the remaining levels are being addressed. The two types — ball and pillar — accommodate the two locking pin geometries used in different 5.5mm pedicle screw head designs. The Crosslink Screwdriver SW3.5 (2200-1308), Crosslink Nut Holder SW3.5 (2200-1310), and Crosslink Measurement gauge (2200-1321) install and size the crosslink connector that spans between the left and right rod systems, increasing torsional stiffness of the bilateral construct. The Screw Measurement gauge (2200-1322) measures the depth for pedicle screw length selection. The 5.5mm System Spinal Persuader Sleeve (2200-1325) and Persuader (2200-1326) provide the specifically sized tulip-engagement and rod-seating force delivery for the 5.5mm system. The 12 N.m Torque Wrench (2200-1331) applies the precise final tightening torque to the set screw at each pedicle screw level — the 12 N.m value is the standard set screw locking torque for most 5.5mm polyaxial pedicle screw systems, preventing under-tightening (risk of set screw back-out) and over-tightening (risk of stripping the locking hole). The Screw Cutter for Long Arm Screw (2200-1309) and Counter Torque for Screw Cutter (2200-1330) trim the extended percutaneous tulip arms after final set screw tightening in MIS cases. The Screw Nut Holder T27 (2200-1311) and Screwdriver T27 (2200-1316) manage the T27-drive set screw components. The Compressor (2200-1327) and Spreader (2200-1328) apply segmental compression and distraction along the seated rod.

CE Mark, ISO 13485, and FDA Certification for Spinal Pedicle Screw Instrumentation Procurement

The Spinal Pedicle Screw Set 5.5mm is manufactured under CE Mark, ISO 13485, and FDA compliant quality standards. ISO 13485 certification confirms Peak Surgicals operates a documented quality management system covering design control, material traceability, and production consistency for spinal surgical instruments. CE Mark confirms conformity with European medical device regulations, and FDA compliance supports procurement for US-based hospitals, spine surgery centers, and neurosurgical departments requiring verified regulatory documentation for pedicle screw instrumentation purchases.

Product Specifications

Frequently Asked Questions

What surgical procedures is the Spinal Pedicle Screw Set 5.5mm used for?
The Spinal Pedicle Screw Set 5.5mm is used for posterior pedicle screw-rod fixation in the thoracic and lumbar spine where a 5.5mm rod diameter system is specified. Primary indications include lumbar spinal fusion for degenerative disc disease with instability, lumbar spondylolisthesis (isthmic and degenerative), lumbar stenosis with instability requiring posterior decompression and fusion, thoracolumbar fracture stabilisation, adult deformity correction requiring posterior spinal instrumentation, and revision pedicle screw fixation for failed prior instrumentation. The 5.5mm rod is the standard diameter used in most minimally invasive posterior lumbar instrumentation systems, and the set's dedicated Persuader, Persuader Sleeve, and Screw Cutter for Long Arm Screw are specifically configured for MIS percutaneous pedicle screw workflows where extended tulip arms are used during rod passing and then cut flush after tightening.

How does this set differ from the Spinal Pedicle Screw System (PS series) also available from Peak Surgicals?
Both sets are posterior pedicle screw-rod instrumentation sets, but they differ in system architecture and instrument configuration. The PS series Spinal Pedicle Screw System ($1,705.00) uses taps φ4.0–7.0mm and includes a rod bender, in-situ bending iron, parallel spreader, and compressor but does not include a Persuader, Persuader Sleeve, Mould Rod, Fixation Pins, Crosslink Measurement gauge, Screw Measurement gauge, or Torque Wrench. The 2200 series Spinal Pedicle Screw Set 5.5mm ($1,815.00) is a 5.5mm-rod-specific MIS instrumentation set with a dedicated Persuader + Sleeve matched to the 5.5mm tulip geometry, eight Fixation Pins (Ball-type and Pillar-type) for provisional rod locking, a 12 N.m Torque Wrench for final set screw tightening, and a Screw Cutter for Long Arm Screw for percutaneous tulip arm trimming. The choice between the two sets depends on which pedicle screw system the spine surgeon uses: a 5.5mm MIS system requires the 2200 series set; a general-purpose lumbar or thoracic posterior fusion system using the PS-series screw sizes requires the PS series instrument set.

What is the 12 N.m Torque Wrench used for?
The 12 N.m Torque Wrench (2200-1331) applies a calibrated 12 Newton-metre torque to the set screw (the locking nut that secures the rod into the polyaxial pedicle screw tulip head) at final tightening. The set screw locking torque is critical: if under-torqued, the set screw can back out under cyclic spinal loading, allowing the rod to displace from the tulip and losing fixation; if over-torqued, the set screw or the tulip threads can be stripped. Most 5.5mm polyaxial pedicle screw systems specify a final set screw torque of 10–14 N.m depending on the screw design, and 12 N.m is the standard value used across many commercial systems. The torque wrench mechanism engages when the specified torque is reached and prevents further tightening beyond 12 N.m, providing consistent set screw seating across all levels in the construct without dependence on surgeon tactile judgment alone.

What are the Fixation Pins (Ball-type and Pillar-type) used for?
The eight Fixation Pins — four Ball-type (2200-1317 ×2, 2200-1318 ×2) and four Pillar-type (2200-1319 ×2, 2200-1320 ×2) — are temporary provisional locking mechanisms used to hold the rod in a seated tulip head before the definitive set screw is tightened. In MIS pedicle screw systems, after the rod is passed subcutaneously or through a small incision and seated into the tulip heads at each instrumented level, the surgeon uses fixation pins inserted through the tulip extension arm into the provisional locking mechanism of the tulip to prevent the rod from backing out while the remaining levels are seated and the rod position is adjusted. Once the rod is correctly positioned at all levels and the Persuader has fully engaged each tulip, the fixation pins are replaced by the definitive set screws and the Torque Wrench is applied. The Ball-type and Pillar-type geometries accommodate the two most common provisional locking pin interface designs used in 5.5mm MIS pedicle screw systems.

What certifications does this set carry?
The Spinal Pedicle Screw Set 5.5mm is manufactured under CE Mark, ISO 13485, and FDA compliant quality standards. ISO 13485 certification confirms Peak Surgicals operates a documented quality management system covering design control, material traceability, and manufacturing consistency for spinal surgical instruments. CE Mark confirms conformity with European medical device regulations, and FDA compliance supports procurement for US hospitals, spine surgery centers, and neurosurgical departments requiring verified regulatory documentation for pedicle screw instrumentation purchases.