Surgical Instrument Setups for Common Soft Tissue Procedures

By Dr. Zubair Khalid, DVM, MS, PhD · 2026-08-11

Key Takeaways

• A standardized core soft tissue instrument pack, including scalpel handles, Metzenbaum and Mayo scissors, Kelly and Crile hemostats, Babcock and Allis forceps, Brown-Adson forceps, needle holders, towel clamps, and laparotomy sponges, forms the foundation for common abdominal procedures, ensuring essential tools for exposure, hemostasis, and tissue handling are readily available.
• Procedure-specific instruments, such as ovarian pedicle clamps and spay hooks for ovariohysterectomy, DeBakey forceps and malleable retractors for cystotomy, and Doyen intestinal clamps and Potts scissors for intestinal resection, are layered onto the core pack to address the unique demands of each surgery, optimizing efficiency and minimizing tissue trauma.
• Mayo stand arrangement should follow a logical order of use, with frequently accessed instruments placed closest to the surgeon, to minimize reaching, reduce cognitive load, and prevent accidental contamination or instrument loss during the procedure.
• Consistent instrument return placement to designated quadrants on the tray and back table is critical for reducing cognitive load and preventing instrument pile-up, thereby enhancing intraoperative flow and communication between surgical team members.
• Rigorous surgical counting protocols, performed at defined time points (pre-incision, body cavity closure, subcutaneous closure, skin closure) by two individuals, are paramount for preventing retained foreign material, with discrepancies necessitating immediate investigation before cavity closure.
• Instrument selection must be tailored to tissue characteristics and mechanical demands; for example, Metzenbaum scissors are preferred for deep dissection due to their long shanks, while Mayo scissors are reserved for tougher tissues, and needle holder choice must match needle gauge to prevent tissue damage and ensure accurate suturing.

This article provides a structured approach to instrument tray organization for three common soft tissue procedures: ovariohysterectomy, cystotomy, and intestinal resection and anastomosis. It is written for practicing veterinarians who want to standardize their surgical preparation, improve intraoperative flow, and communicate clearly with surgical nurses and technicians. The content addresses how to build a core soft tissue pack, how to layer procedure-specific instruments onto that foundation, and how to arrange the Mayo stand and back table to reduce reaching, dropping, and contamination events.

The principles presented here apply across species, though the specific instrument sizes and retraction strategies differ between small animal, large animal, and exotic patients. Where species differences matter, they are noted explicitly. The article assumes the reader already knows how to perform these procedures and focuses instead on the setup logic that supports efficient and safe execution.

At a Glance

Instrument Selection Logic

Instrument choice follows from the tissue characteriztics and the mechanical demands of each step. Soft tissue surgery requires instruments that grasp without crushing, cut without tearing, and hold suture without damaging it. The same instrument that works well on the uterine body may be inappropriate for the bladder wall or the intestinal serosa.

Metzenbaum scissors are the default dissecting instrument for most soft tissue planes because their long shanks and relatively short blades allow precise spreading in depth. Mayo scissors, with their heavier blades, are reserved for cutting fascia, suture, and tougher connective tissue. Using the wrong scissors type causes unnecessary tissue trauma and premature blade dulling.

Needle holder selection deserves particular attention. A standard Mayo-Hegar holder suits most abdominal closure work, but fine ophthalmic or Castroviejo holders are needed for intestinal anastomoses in cats and small dogs. The jaws must match the needle gauge, using a large holder on a small needle distorts the needle and makes accurate bites difficult.

Tray Organization Principles

A well-organized tray serves two functions: it keeps sterile instruments accessible, and it communicates the surgical plan to everyone in the room. When instruments are arranged in the order they will be used, the surgeon and the assistant can anticipate the next step without verbal instruction.

The back table holds the full pack, while the Mayo stand carries only the instruments needed for the current phase of the procedure. This distinction matters. Overloading the Mayo stand creates clutter and increases the risk of accidental contamination when instruments are returned. A common rule is to keep no more than eight to ten instruments on the Mayo stand at any time.

Return placement should be consistent. Hemostats go to one corner, forceps to another, scissors to a third. This consistency allows the surgeon to reach for an instrument without looking, which is particularly valuable when eyes are fixed on the surgical field. The scrub nurse or technician should be trained to replace instruments in their designated positions instead of wherever space allows.

The Core Soft Tissue Pack

The core pack forms the foundation for all three procedures described in this article. It contains the instruments needed for skin incision, subcutaneous dissection, abdominal entry, and routine closure. Building a single core pack that is used for multiple procedures reduces inventory costs and simplifies training.

A functional core pack includes the following: one number 3 scalpel handle with a number 10 blade for skin and a number 15 blade for finer dissection, one Mayo scissors, one Metzenbaum scissors, four Kelly hemostats, four Crile hemostats, two Babcock forceps, two Allis tissue forceps, one Brown-Adson forceps, two Mayo-Hegar needle holders, four Backhaus towel clamps, and a minimum of six laparotomy sponges. Some practices add a Gelpi retractor or a Balfour retractor for larger patients.

The core pack should be sterilized and stored as a single wrapped unit. This approach reduces turnaround time between cases and ensures that no instrument is missing when the pack is opened. Each practice should maintain an inventory list inside the pack wrapper so that the scrub nurse can verify contents before sterilization.

Procedure-Specific Additions

Ovariohysterectomy

The ovariohysterectomy requires instruments that can reach deep into the caudal abdomen and secure the ovarian pedicle reliably. A spay hook is essential for exteriorizing the uterine horn through a small incision. Right-angled forceps, such as Mixter or Crile-Wood, are used to pass ligatures around the ovarian pedicle and the uterine body. A fine-tipped needle holder improves access to the deep ligation sites.

For large or obese patients, a longer scalpel handle and extended Metzenbaum scissors reduce the need for excessive traction on the incision. Some surgeons prefer an electrosurgical handpiece for pedicle coagulation, if so, the handpiece and foot pedal should be verified before the patient is draped.

Cystotomy

Cystotomy demands instruments that handle a hollow, fluid-filled organ without crushing its wall. DeBakey forceps provide attaumatic grasping of the seromuscular layer. A suction tip with a fine aperture is necessary to keep the field clear of urine during the mucosal inspection. A malleable retractor helps elevate the bladder into the incision and provides exposure within the pelvic canal.

Long needle holders and long thumb forceps are useful when the bladder is deep within the abdomen, particularly in large-breed dogs. Stay sutures placed through the bladder wall at the incision margins are often more effective than Allis forceps for retraction, because they distribute tension evenly and avoid crushing the tissue.

Intestinal Resection and Anastomosis

Intestinal surgery requires atraumatic occlusion of the bowel lumen and precise apposition of the cut edges. Doyen intestinal clamps are the standard choice for occluding the bowel without damaging the wall. Their broad, rubber-shod jaws distribute pressure over a wide area. Potts scissors, with their angled blades, allow precise cutting of the intestinal wall without nicking the opposite side.

Fine thumb forceps, such as DeBakey or Adson with 1 x 2 teeth, are used to handle the bowel edges during suturing. Vessel loops are useful for temporary occlusion of the bowel when clamps would be too bulky. A fine needle holder with a taper-point needle is required for the anastomosis itself, the needle must be small enough to pass through the submucosa without tearing it.

Instrument Counts and the Surgical Count Process

A standardized count protocol is as important as the instruments themselves. Counts should be performed at defined time points: before the first incision, at closure of the body cavity, at subcutaneous closure, and at skin closure. The same two individuals, typically the surgeon and the circulating nurse or technician, should perform each count. Counts must include all sponges, gauze squares, suture needles, scalpel blades, and any small items such as vessel clips or catheter stylets.

The count board or written record should list items in the order they appear on the mayo stand and back table. This arrangement allows a systematic sweep instead of a random search. If a count discrepancy occurs, the surgical field is examined first, followed by the drapes, the floor, and the instrument trays. If the missing item is a needle, radiography of the patient and the surgical field is indicated before closure proceeds. The same principle applies to any radiopaque item. Do not close a body cavity with an unresolved count discrepancy.

Arranging Instruments on the Mayo Stand

The mayo stand should be organized so that the surgeon can reach the most frequently used instruments without looking away from the field. The arrangement follows a consistent logic: the working instruments sit closest to the surgeon, the assistant instruments sit across the stand, and the rarely used or emergency instruments sit at the far edge.

A practical layout for a standard soft tissue procedure, from the surgeon's side outward, is as follows:

The needle holder should be loaded with the needle at the moment of use, not preloaded on the stand. Preloaded needles are easily knocked onto the floor or into the drapes. The scalpel blade should be mounted on the handle immediately before incision and removed immediately after the skin incision is complete, unless the procedure requires a blade for sharp dissection within the body cavity.

Printable Checklist Templates

The following templates are designed to be printed and used as a working reference during tray assembly. Each template lists the instruments in the order they should be placed on the back table, which is also the order in which they should be counted.

Ovariohysterectomy Tray

{
 "type": "bars",
 "title": "Item by Quantity",
 "items": [
  {
   "label": "Scalpel handle No. 3",
   "value": 1
  },
  {
   "label": "Metzenbaum scissors",
   "value": 1
  },
  {
   "label": "Mayo scissors, curved",
   "value": 1
  },
  {
   "label": "Suture scissors",
   "value": 1
  },
  {
   "label": "Brown-Adson forceps",
   "value": 1
  },
  {
   "label": "Rat-toothed forceps",
   "value": 1
  },
  {
   "label": "DeBakey forceps",
   "value": 1
  },
  {
   "label": "Mosquito hemostats, curved",
   "value": 6
  }
 ]
}

Cystotomy Tray

{
 "type": "bars",
 "title": "Item by Quantity",
 "items": [
  {
   "label": "Scalpel handle No. 3",
   "value": 1
  },
  {
   "label": "Metzenbaum scissors",
   "value": 1
  },
  {
   "label": "Mayo scissors, curved",
   "value": 1
  },
  {
   "label": "Suture scissors",
   "value": 1
  },
  {
   "label": "Brown-Adson forceps",
   "value": 1
  },
  {
   "label": "Rat-toothed forceps",
   "value": 1
  },
  {
   "label": "DeBakey forceps",
   "value": 1
  },
  {
   "label": "Mosquito hemostats, curved",
   "value": 4
  }
 ]
}

Intestinal Resection and Anastomosis Tray

{
 "type": "bars",
 "title": "Item by Quantity",
 "items": [
  {
   "label": "Scalpel handle No. 3",
   "value": 1
  },
  {
   "label": "Metzenbaum scissors",
   "value": 1
  },
  {
   "label": "Mayo scissors, curved",
   "value": 1
  },
  {
   "label": "Suture scissors",
   "value": 1
  },
  {
   "label": "Brown-Adson forceps",
   "value": 1
  },
  {
   "label": "Rat-toothed forceps",
   "value": 1
  },
  {
   "label": "DeBakey forceps",
   "value": 1
  },
  {
   "label": "Mosquito hemostats, curved",
   "value": 6
  }
 ]
}

Species and Setting Modifications

The same core tray serves most small animal procedures, but species and production setting change the details. In feline patients, the smaller instruments, specifically mosquito hemostats and smaller needle holders, are used preferentially. The Balfour retractor is omitted. In equine and bovine patients, the instrument sizes increase substantially. Rochester-Carmalt forceps replace Kelly hemostats for most clamping tasks, and the needle holder must be a large pattern such as the Mayo-Hegar 8-inch or the Sarot pattern.

In a high-volume spay-neuter setting, the tray is often reduced to the minimum: one scalpel handle, one pair of Metzenbaum scissors, one needle holder, one rat-toothed forceps, four mosquito hemostats, and one ligature reel. This reduction speeds turnover but requires the surgeon to adapt. The reduced tray is appropriate for healthy patients with uncomplicated anatomy. It is not appropriate for a pyometra, a suspected neoplasia, or any patient where the procedure may become exploratory.

For ruminants and pigs, the approach to the abdomen differs. A flank approach in cattle requires longer instruments and a different retraction strategy. The tray should include a longer scalpel handle, extended Metzenbaum scissors, and a Finochetto retractor for the flank incision. The surgeon should confirm the availability of these items before starting, as they are not part of the standard small animal pack.

Equipment and Consumable Choices That Change the Setup

The choice of suture material and needle type alters the needle holder selection. A taper needle for intestinal closure requires a standard needle holder. A cutting needle for skin closure can be held with the same instrument, but the surgeon should confirm that the needle holder jaws are not worn. Worn jaws cause needle rotation and tissue trauma. The needle holder should be matched to the needle size: a fine needle holder for 3-0 or smaller suture, a medium pattern for 2-0 and 0, and a large pattern for 1 and larger.

Monopolar electrocautery is a standard addition to the soft tissue tray. The cautery pencil and cord should be positioned on the surgeon's side of the mayo stand, with the tip guard in place when not in use. The grounding pad must be placed before the patient is draped. In patients with cardiac disease or pacemakers, bipolar cautery is preferred over monopolar. The bipolar forceps should be added to the tray in these cases.

Laparoscopic approaches change the instrument list entirely. The open tray is replaced by a laparoscopic tower with a camera, light source, insufflator, and monitor. The instruments are 3 to 5 mm in diameter for small patients and 5 to 10 mm for larger patients. The camera holder can be a human assistant or a mechanical arm. Robotic camera holders such as the ViKY system have been validated in porcine models and offer the advantage of a compact, sterilizable manipulator that sits directly on the operating table without occupying floor space modified robotic lightweight endoscope validation in a porcine model. This arrangement leaves the surgical field unobstructed and provides steady camera control during complex dissection.

Laparoscopic graspers with enhanced haptic feedback have been shown to reduce the force applied during tissue palpation by a factor of 3.1 compared with conventional graspers in a randomized crossover trial laparoscopic graspers with enhanced haptic feedback force comparison. This reduction in applied force is clinically relevant for delicate procedures such as intestinal manipulation or bladder handling, where excessive force causes serosal tearing and postoperative adhesion formation. Practices that perform a high volume of laparoscopic soft tissue surgery should consider adding haptic-enhanced graspers to their instrument inventory.

Documentation of the Setup

The surgical record should include the instrument count sheet, the names of the individuals performing the count, and the time points at which counts were completed. Any discrepancy and its resolution must be documented in the patient record. The record should also note the specific instruments used, particularly if a nonstandard item was added to the tray. This documentation supports continuity if a second surgery is required and provides a reference for future tray assembly.

The count sheet should be filed with the surgical report. Many practices use a standardized form that lists the standard tray contents with a checkbox for each item. This form reduces the risk of omission during tray assembly and speeds the count process. The form should be reviewed periodically and updated when the tray contents change.

Recognized Complications and Early Detection

Instrument-related morbidity in soft tissue surgery usually follows one of three pathways: retained foreign material, tissue trauma from poor instrument handling, or failure of a device under load. Each has a distinct early warning signature.

Retained gauze or sponges remains the most consequential failure. Detection begins with the count, but the count is only reliable when performed in the same sequence every time. The circulating nurse counts as items leave the sterile field, the scrub nurse counts as they return, and both verify against the written record before closure of any body cavity. A discrepancy of any size halts closure until resolution. Imaging is a secondary check, not a substitute for a disciplined count. Radiopaque markers on laparotomy sponges aid detection but do not reduce the need for a complete count before fascial closure.

Inadvertent tissue trauma from excessive force is subtler. Crushed bowel edges, torn mesentery, or crushed bladder mucosa may not be obvious until leakage or delayed healing appears days later. Early detection relies on the surgeon recognizing the feel of the instrument in hand. A needle holder that clicks under pressure, forceps that slip on wet tissue, or a retractor that has lost its spring all signal that the instrument is being used beyond its design limits. Replace the instrument instead of compensating with more force.

Device failure under load, such as a stapler that misfires or a ligature that pulls through tissue, is detected by immediate inspection of the staple line or ligature site before releasing tension. If a staple line appears incomplete, reinforce with sutures instead of assuming the device will hold.

Common Errors and Corrective Actions

Less experienced clinicians tend to select instruments by habit instead of by tissue requirement. A common error is using a large needle holder for fine intestinal work, which crushes the needle swage and causes the needle to rotate in the jaws. The corrective action is to match the needle holder jaw width to the needle diameter and to grip the needle at the swage, not the tip.

Another frequent error is overloading the Mayo stand. When instruments are stacked in layers, the surgeon cannot see what is available and the scrub nurse cannot retrieve items without disturbing the field. The corrective action is to limit the Mayo stand to the instruments needed for the immediate step and to keep the remainder on the back table.

A third error is the use of crushing forceps on tissue that will be anastomosed. Allis or Babcock forceps applied to the bowel edge for retraction can devitalise the seromuscular layer. The corrective action is to use stay sutures or atraumatic forceps for handling the anastomotic edges and to reserve crushing instruments for tissue that will be excised.

Students frequently confuse similar-looking instruments, particularly the Mixter and the right-angle forceps, or the Rochester-Carmalt and the Rochester-Pean. The discriminating feature is the jaw pattern: Carmalt jaws have longitudinal ridges that interdigitate, while Pean jaws have cross-hatched teeth. Labeling trays with photographs or diagrams reduces this error during training.

Limitations of the Evidence and Divergent Expert Opinion

The published evidence on instrument setups is largely descriptive and institutional. Randomised comparisons of specific tray configurations are absent, and most recommendations derive from expert consensus and surgical tradition instead of controlled trials. Studies of laparoscopic instrumentation, such as the randomised comparison of graspers with enhanced haptic feedback, show measurable differences in applied force, but whether these translate to improved outcomes in open soft tissue surgery is not established. The same limitation applies to robotic camera holders and robotic-assisted procedures, which have been validated in porcine models and small clinical series but lack large comparative trials in veterinary patients.

Expert opinion differs on several points. Some surgeons prefer a single multipurpose pack with procedure-specific additions, while others maintain separate dedicated trays for each procedure. The former reduces storage and sterilization costs but increases the risk of missing a specific instrument at the critical moment. Opinion also differs on whether to include a self-retaining retractor in the core pack. Practices with high caseloads often keep the Balfour or Gosset on a separate ring stand, while low-volume practices include it in every pack to avoid a second setup.

There is genuine uncertainty about the optimal number of instruments in a tray. Excess instruments increase count time and the risk of retained items, but too few instruments force the surgeon to improvise with inappropriate tools. Most teaching hospitals now favour a lean core pack with a defined addition list, but this is a practical preference instead of an evidence-based standard.

Referral, Consultation, and Reporting

Referral to a specialist surgeon or a facility with advanced instrumentation is warranted when the planned procedure exceeds the surgeon's training or the available equipment. Examples include complex reconstructions, procedures requiring magnification beyond loupes, or cases where minimally invasive access would materially reduce morbidity. The American College of Veterinary Surgeons maintains condition-specific summaries that can guide the decision to refer.

Laboratory involvement is indicated when intraoperative findings suggest infection, neoplasia, or metabolic disease that will change postoperative management. Submit tissue for histopathology whenever the gross appearance is ambiguous, and culture tissue or fluid when an abscess or septic peritonitis is suspected.

Regulatory reporting obligations vary by jurisdiction. Reportable events may include suspected foreign body retention, unanticipated death, or complications related to a specific device. The World Organization for Animal Health publishes international standards for disease reporting, and national veterinary bodies provide local requirements. When in doubt, consult the relevant authority before discharge of the patient.

Frequently Asked Questions

How should I adapt a standard soft tissue pack when working in a low-resource or general practice setting?

Prioritize versatility over procedure specificity. A single pack containing Mayo scissors, Metzenbaum scissors, needle holders, Brown-Adson forceps, rat-toothed forceps, Babcock forceps, Allis tissue forceps, hemostatic forceps in two sizes, scalpel handle, and a selection of retractors covers most soft tissue procedures. Add procedure-specific instruments individually instead of maintaining separate packs. For ovariohysterectomy, a spay hook and ovarian pedicle clamp suffice. For cystotomy, a malleable retractor and suction tip improve visibility. For intestinal resection, intestinal forceps or atraumatic clamps are necessary. Sterile disposable instruments offer an alternative when autoclaving capacity is limited. The American Veterinary Medical Association practice resources provide guidance on maintaining surgical standards within practice constraints.

What is the minimum instrument set for an emergency exploratory laparotomy when the full pack is unavailable?

A scalpel handle with blade, one pair of Mayo scissors, one pair of Metzenbaum scissors, two needle holders, Brown-Adson forceps, rat-toothed forceps, four hemostatic forceps, two Babcock forceps, and a self-retaining retractor form a functional minimum. Use laparotomy sponges for retraction when dedicated retractors are absent. For intestinal work, two atraumatic clamps or noncrushing vascular clamps are essential. If no suction is available, use laparotomy sponges and manual packing. Close the abdomen with a simple continuous pattern using absorbable suture. The American College of Veterinary Surgeons animal health resources describe expected outcomes for common abdominal procedures and can help prioritize which steps require dedicated instruments versus acceptable substitutes.

How does the instrument setup differ for feline versus canine ovariohysterectomy?

Feline patients require smaller instruments throughout. Use delicate Metzenbaum scissors, small needle holders, and fine hemostatic forceps. A pediatric spay hook or a small right-angled forceps facilitates ovarian pedicle retrieval. The smaller abdominal incision and reduced working space make a mini-Balfour retractor or Gelpi retractors preferable to a full-sized Balfour. Needle selection changes to smaller swaged-on needles with 3-0 or 4-0 suture. For pediatric or juvenile feline patients, consider microsurgical instruments if available. The MSD Veterinary Manual professional edition provides species-specific guidance on tissue handling and healing characteriztics that inform instrument selection.

What documentation should accompany a surgical instrument setup?

Record the contents of each pack, the sterilization date and method, and the initials of the person who assembled and sterilized the pack. Maintain a log of instrument counts performed before, during, and after each procedure. Note any instruments added to or removed from the standard pack for a specific surgery. If a pack is opened but not used, document this and return it for reprocessing. For robotic or mechanically assisted procedures, record the setup time and any equipment-specific checks performed. The WOAH terrestrial animal health standards emphasize traceability and documentation as components of surgical quality assurance in production animal settings, and the same principle applies to companion animal practice.

How should I explain a required instrument purchase or pack revision to a practice manager or supervisor?

Frame the request around patient outcomes and efficiency. Identify the specific procedure or complication rate that the new instrument addresses. Compare the cost of the instrument against the cost of repeated surgeries, prolonged anesthesia, or referral. For example, a quality needle holder with tungsten carbide inserts costs less than one revision surgery for a broken needle or a poorly tied knot. Present the instrument as part of a standardized pack revision instead of an isolated purchase. Reference professional standards from the American Veterinary Medical Association practice resources to support the request as a matter of surgical quality instead of personal preference.

When should I consider a robotic or mechanically assisted instrument setup?

Robotic assistance adds value for procedures requiring fine dissection, steady camera control, or enhanced visualization. The modified lightweight robotic endoscope validation study demonstrated that compact robotic camera holders can be placed directly on the operating table without interfering with handheld instruments. However, robotic systems require dedicated setup time, training, and cost. For routine ovariohysterectomy, cystotomy, or intestinal resection, conventional instruments remain appropriate and efficient. Reserve robotic setups for complex reconstructions, procedures in confined spaces, or teaching situations where the trainee benefits from stabilized visualization. The porcine model for open robotic thyroidectomy illustrates how robotic approaches can be developed and standardized for specific procedures before clinical application.

Related Clinical & Scientific Guides

• Perioperative Antibiotic Prophylaxis: Timing and Selection
• Surgical Approaches to the Femur and Stifle
• Fracture Healing Assessment: Radiographic and Clinical Evaluation

References and Further Reading

• Modified robotic lightweight endoscope (ViKY) validation in vivo in a porcine model.. 2007.
• Porcine Model for Open Robotic Thyroidectomy. 2022.
• Robot-assisted anterior lumbar interbody fusion in a Swine model in vivo test of the da vinci surgical-assisted spinal surgery system.. 2011.
• The effects of laparoscopic graspers with enhanced haptic feedback on applied forces: a randomized comparison with conventional graspers.. 2017.
• Robotically assisted laparoscopic cholecystectomy: a pilot study.. 2001.
• Video. Chopstick surgery: a novel technique enables use of the Da Vinci Robot to perform single-incision laparoscopic surgery.. 2010.
• American College of Veterinary Surgeons Animal Health Resources. American College of Veterinary Surgeons.
• MSD Veterinary Manual, Professional Edition. MSD Veterinary Manual.
• American Veterinary Medical Association Practice Resources. American Veterinary Medical Association.

Related Articles

• Soft Tissue Sarcoma Surgery: Margins and Reconstruction
• Perioperative Analgesia Protocols for Major Soft Tissue Surgery
• Surgical Complications: Recognition and Management
• Surgical Drains: Indications and Maintenance
• Surgical Lighting and Magnification: Selection and Use

This article is educational professional reference material for veterinary audiences. It is not a substitute for veterinary diagnosis, individual clinical judgment, current product labeling, or applicable regulatory requirements.