Negative Pressure (VAC) Dressing: How Long It Runs and What It Costs Per Week
Published: 15 September 2026 · Last Updated: September 2026
Key Takeaways
- VAC therapy uses controlled negative pressure to manage selected complex wounds.
- Dressing-change frequency depends on the wound condition, drainage, and infection.
- Treatment may continue for days or weeks, depending on healing progress.
- Weekly cost can include machine rental, consumables, and dressing-change charges.
- VAC therapy does not replace treatment for infection, poor circulation, or dead tissue.
- Some wounds may later require skin grafting or reconstructive surgery.
- Regular reassessment helps determine when VAC therapy should be continued, changed, or stopped.
Negative Pressure Wound Therapy (NPWT), commonly called a VAC dressing, uses controlled suction over a sealed wound to manage fluid and support the healing environment. The negative pressure wound therapy cost per week depends on machine rental, consumables, dressing-change frequency, and wound size. Treatment may continue for days or several weeks depending on wound progress.
VAC therapy can be useful for selected diabetic foot wounds, traumatic wounds and wounds being prepared for grafting or reconstruction. However, it is only one part of wound management. Infection, dead tissue, poor circulation, and repeated pressure may require separate treatment.
What Does Negative Pressure Therapy Actually Do to a Wound?
A VAC dressing is a form of negative pressure wound therapy.
A special foam or wound-contact material is placed over or within the wound. It is covered with an adhesive film to create a seal and connected by tubing to a suction device.
The machine then applies controlled negative pressure to the wound.
Depending on the clinical situation, this can help:
- Remove excess wound fluid
- Manage heavy exudate
- Reduce fluid accumulation
- Support development of healthy granulation tissue
- Maintain a protected wound environment
- Prepare selected wounds for closure or reconstruction
VAC therapy does not correct every reason a wound fails to heal. A patient may still require treatment for infection, inadequate circulation, diabetes control or excessive pressure on the affected foot.
Patients with complex ulcers may therefore need a broader diabetic wound treatment plan rather than VAC therapy alone.
Which Wounds Benefit and Which Do Not?
Negative pressure therapy may be considered for several types of complex wounds.
These can include:
- Selected diabetic foot ulcers
- Deep wounds after debridement
- Traumatic soft-tissue wounds
- Selected surgical wounds
- Wounds producing substantial fluid
- Selected wounds following infection control
- Wounds being prepared for grafting
- Complex defects awaiting reconstruction
However, deciding whether VAC is appropriate requires assessment of the wound itself and the patient's overall condition.
The wound must be properly assessed.
A diabetic foot ulcer can involve much more than the visible skin defect.
Doctors may need to evaluate:
- Wound depth
- Dead tissue
- Infection
- Bone involvement
- Blood circulation
- Pressure on the affected area
- Neuropathy
- Surrounding skin
- Overall diabetes control
For example, a wound with significant dead or infected tissue may require debridement before VAC therapy becomes useful.
Similarly, severely inadequate circulation cannot be corrected simply by applying negative pressure.
The decision should therefore be based on clinical assessment rather than assuming every deep wound needs a VAC dressing.
How Long Does a VAC Dressing Run Each Day?
Patients often assume the VAC machine only needs to operate periodically.
In practice, NPWT is usually prescribed according to a specific treatment schedule, and the device may need to operate for prolonged periods.
Whether the therapy is continuous or uses another prescribed mode depends on the wound and clinical plan.
Patients should not:
- Change the pressure themselves
- Turn the device off for long periods without instructions
- Alter the treatment mode
- Remove the dressing simply because the machine alarms
If the machine stops or repeatedly alarms, contact the wound-care team or follow the device instructions provided at discharge.
How Many Changes Per Week and for How Many Weeks?
There is no universal number of VAC dressing changes that applies to every patient.
The required frequency depends on several factors:
- Wound size
- Amount of drainage
- Infection status
- Dressing material
- Surrounding skin
- Wound location
- Clinical progress
- Treatment protocol
A stable wound may follow one schedule, while an infected or rapidly changing wound may require closer review.
The dressing should not simply be left in place longer to reduce expenses.
Each dressing change can also provide an opportunity to reassess the wound and determine whether treatment is working.
How many weeks is VAC needed?
The total duration also varies.
Some patients need VAC therapy only temporarily after removal of unhealthy tissue. Others may require treatment for longer while healthy granulation tissue develops.
The duration may depend on:
- Initial wound depth
- Wound dimensions
- Infection control
- Blood supply
- Exposed deeper structures
- Diabetes management
- Nutrition
- Pressure reduction
- Response to treatment
- Planned reconstruction
Instead of asking only how many weeks the machine has been used, the treating team needs to determine whether the wound is showing meaningful progress.
What Is the Weekly Cost Made Of?
The negative pressure wound therapy cost per week is not simply the price of the VAC machine.
Several components contribute to the overall cost.
| Cost component | What affects it |
|---|---|
| Machine rental/use | Device type and rental, hospital or home-care arrangement |
| Consumables per change | Foam, tubing, adhesive film, canister, and other dressing materials |
| Changes per week | Wound condition, drainage, infection and treatment protocol |
| Professional wound care | Complexity and whether care occurs at home, clinic or hospital |
| Additional procedures | Debridement or other treatment when required |
| Investigations | Tests for infection, circulation or deeper involvement |
| Total duration | How quickly the wound progresses toward closure or reconstruction |
A large wound requiring frequent changes and producing significant drainage may cost more per week than a smaller, stable wound.
Similarly, treatment costs can differ between hospital, clinic and home-care arrangements.
For this reason, a reliable weekly estimate generally requires assessment of the wound first.
Patients concerned about the broader financial planning of treatment can also review the clinic's EMI and financing options.
Why Can't VAC Cost Be Estimated From a Wound Photograph?
A photograph shows only part of the clinical picture.
Two wounds can look similar but behave very differently.
One may have adequate blood supply and limited tissue involvement. Another may have poor circulation, deep infection, exposed tendon or underlying bone infection.
Treatment cost can therefore depend on much more than the visible dimensions of the ulcer.
The clinician may need to determine whether additional investigations, debridement, antibiotics, offloading or reconstruction will be required.
A fixed quotation based solely on a photograph can therefore be misleading.
Does VAC Therapy Replace Debridement?
No.
Debridement means removing dead, unhealthy, or infected tissue when clinically indicated.
If significant non-viable tissue remains within a wound, simply placing a VAC dressing over it does not necessarily address the underlying problem.
Some patients may first require debridement surgery explained as part of their treatment plan.
After suitable wound cleaning and infection management, negative pressure therapy may sometimes help manage wound fluid and encourage development of a healthier wound bed.
The sequence varies according to the wound.
Some patients may also require more than one assessment or procedure because complex diabetic foot infections can extend deeper than they initially appear.
Can VAC Dressing Treat an Infected Diabetic Foot?
VAC therapy can form part of the management of selected infected wounds, but VAC does not replace infection control.
A significant diabetic foot infection may require:
- Surgical assessment
- Removal of dead tissue
- Drainage of an abscess
- Appropriate antibiotics
- Investigation for bone infection
- Blood-supply assessment
- Diabetes management
- Pressure reduction
If the infection is worsening, continuing the same dressing without reassessment can delay necessary treatment.
Warning signs such as increasing redness, swelling, fever, worsening discharge, black tissue, or general illness should prompt medical assessment.
Why Is Blood Supply Important Before VAC Therapy?
A wound requires adequate circulation to heal.
Negative pressure can improve aspects of wound management, but it cannot substitute for severely inadequate arterial blood flow.
This issue is especially relevant in diabetic foot disease because some patients have both neuropathy and peripheral arterial disease.
Depending on the examination, doctors may assess foot pulses and consider Doppler or other vascular investigations.
If circulation is significantly impaired, vascular assessment or treatment may become an important part of the overall wound plan.
Can VAC Therapy Be Done at Home?
Yes, selected patients may be able to receive negative pressure therapy at home when the wound, patient's condition, and device arrangement make this appropriate.
However, home treatment still requires medical supervision.
Patients and caregivers should understand:
- When the dressing needs changing
- Who will perform the dressing change
- How to handle the machine safely
- What to do if the machine alarms
- What to do if suction is lost
- When the next wound review is scheduled
- Which warning signs require urgent attention
Using VAC therapy at home should not mean continuing treatment indefinitely without professional wound review.
What Happens If the Machine Seal Breaks?
A good seal is necessary for the device to maintain the prescribed negative pressure.
If the seal breaks, the machine may alarm or stop maintaining suction.
Patients should follow the troubleshooting instructions given by their healthcare team or device provider.
A minor problem may involve loose adhesive film, tubing, or the canister connection. However, patients should not repeatedly dismantle or reconstruct the dressing unless they have specifically been trained to do so.
If suction cannot be restored, contact the wound-care team.
Seek prompt medical advice if the problem is accompanied by significant bleeding, worsening pain, increasing leakage, or sudden wound changes.
Is VAC Dressing Painful?
Some patients experience discomfort during a VAC dressing change, particularly when old dressing material is removed.
The amount of discomfort varies according to:
- Wound sensitivity
- Wound depth
- Dressing material
- Location
- Tissue condition
- Presence of infection
Pain management can be planned when necessary.
New or rapidly increasing pain should not simply be assumed to be a normal effect of VAC therapy. It may require reassessment of the wound.
How Do Doctors Know Whether VAC Is Working?
The aim is not merely to keep the machine running.
The wound should demonstrate progress.
Depending on the original condition, clinicians may look for:
- Healthier granulation tissue
- Better control of wound fluid
- Reduction in wound depth
- Reduction in wound dimensions
- Improvement in surrounding tissues
- Progress toward closure
- Readiness for grafting or reconstruction
Wound photographs and measurements may be used to compare progress between visits.
If the wound is not improving as expected, the treatment plan should be reconsidered.
When Is VAC Stopped and Grafting Planned?
VAC therapy is generally continued only while it serves a useful purpose.
It may be stopped when the wound has:
- Improved sufficiently for conventional dressings
- Developed a suitable wound bed
- Become ready for direct closure
- Become suitable for skin grafting
- Become ready for another reconstructive procedure
It may also be reconsidered if the wound stops improving or develops a new problem.
VAC before skin grafting
One role of negative pressure therapy is to help prepare selected wounds for definitive coverage.
After unhealthy tissue has been addressed, a wound may need time to develop healthy tissue before grafting is considered.
When appropriate, the next stage may involve skin grafting for diabetic wounds.
Other wounds may require local flap or more complex reconstructive surgery.
VAC should therefore sometimes be considered a bridge to the next stage of reconstruction, rather than the final treatment itself.
Why Offloading Still Matters During VAC Therapy
A VAC dressing does not remove the mechanical pressure created when a person repeatedly walks on a diabetic foot ulcer.
If pressure continues at the wound site, healing tissue may repeatedly become damaged.
Offloading can therefore remain important even when advanced wound therapy is being used.
The appropriate method depends on:
- Wound location
- Foot structure
- Infection
- Circulation
- Neuropathy
- Mobility
- Other surgical procedures
Patients should follow the treating team's instructions about footwear, walking, and weight bearing.
Final Thoughts
The negative pressure wound therapy cost per week varies because VAC treatment involves more than a machine. Machine use or rental, foam and other consumables, canisters, dressing changes, professional wound care, and total treatment duration all influence the overall expense.
Similarly, there is no fixed number of VAC changes or weeks that applies to every wound.
Dr. Ashutosh Shah, with 22+ years of experience, assesses complex wounds according to their depth, infection, circulation, tissue condition, and reconstructive requirements. At Elegance Clinic, the aim is to determine whether the patient needs continued VAC therapy, infection control, debridement, grafting, or another form of reconstruction.
FAQs
How many hours a day should a VAC dressing run?
NPWT is generally prescribed to operate for prolonged periods according to the clinician's settings and treatment plan. Patients should not routinely switch the device off or change its pressure settings without instructions from their wound-care team.
How often does a VAC dressing need changing?
The frequency depends on the wound, drainage, infection, and treatment protocol. Some wounds require more frequent dressing changes than others. The treating team should determine the appropriate schedule after assessing the wound.
Is VAC dressing painful?
Some patients experience discomfort during dressing changes or suction therapy, while others tolerate it well. Pain should be discussed with the treating team, particularly if it suddenly increases or is accompanied by other wound changes.
Can I walk while using a VAC machine?
It depends on the wound and reconstruction. The presence of a portable VAC machine does not automatically mean weight-bearing is safe. Follow the surgeon's or wound team's specific mobility and offloading instructions.
Can VAC therapy heal a diabetic foot ulcer completely?
It can support healing in appropriately selected wounds, but it does not correct every underlying problem. Infection, poor circulation, pressure, dead tissue, and diabetes management may require additional treatment.
When should I contact the doctor during VAC treatment?
Seek medical advice for worsening redness, swelling, fever, increasing pain, significant bleeding, black tissue, unexpected discharge, persistent device problems, or rapid changes in the wound.
Ready to discuss your concern in person? Book a private consultation at our Adajan or Vesu clinic. Call +91 83205 00350 or use the Book Consultation button.
