【Introduction】
As the detection rate of early renal tumors has been increasing year by year, nephron-sparing surgery (NSS) has become the mainstream surgical approach for renal tumors. Traditional surgeries often encounter problems such as renal ischemia due to kidney occlusion, large surgical incisions, and inaccurate prediction of tumor boundaries. With the innovation of surgical concepts and the use of three-dimensional anatomical assistance tools, the three technologies of non-invasive suturing, ultrasound-guided hemostasis, and three-dimensional preoperative planning have been successfully integrated and implemented together, significantly improving the safety of nephron-sparing surgeries and the long-term preservation of renal function. MAXSEAS relies on customized 3D printed anatomical models to provide preoperative visualization support for the entire set of refined nephron-sparing surgical procedures.


【Non-surgical suture】

In conventional partial nephrectomy surgeries, the renal artery is often temporarily clamped. The brief ischemia of the kidney can cause irreversible damage to the renal units, which in turn affects the postoperative renal function.

The non-invasive suture mode can maintain uninterrupted blood flow in the kidney throughout the entire process of complete removal of the renal tumor. It does not require blocking the renal pedicle and can fundamentally avoid ischemia-reperfusion injury, maximizing the preservation of the remaining renal parenchyma and ensuring the smooth operation of the kidney's physiological functions during the procedure. It is particularly suitable for patients with isolated kidneys or those with weakened renal function who are at high risk.

【Ultrasound-guided suturing】

Traditional stitching and sewing were used to repair kidney wounds, which caused significant tearing and damage to the renal tissue. The larger the stitching area, the more normal renal tissue was lost.

The new ultrasound-guided hemostasis method, combined with the new generation of hemostasis patches and precise coagulation technology, eliminates the traditional stitching operation. It precisely closes the kidney wound, effectively controls bleeding, significantly reduces the mechanical trauma to the kidney caused by the surgery, shortens the wound healing cycle, and lowers the probability of postoperative bleeding and urine leakage complications.

【Three-dimensional preoperative planning】

The two-dimensional CT images are difficult to clearly distinguish the tumor infiltration boundaries, the paths of various renal vessels, and individual anatomical variations. This can lead to insufficient surgical margins and accidental injury to blood vessels during the operation.

Three-dimensional preoperative planning can reconstruct the patient's DICOM thin-layer CT data to generate an individualized three-dimensional anatomical model, which clearly and intuitively presents the size and invasion range of the tumor, the distribution of renal arteries and veins, and the differences in adjacent tissues. Surgeons can complete the selection of the surgical approach, the delineation of the resection range, the design of the hemostasis plan, and conduct virtual surgery simulations before the operation, ensuring that they have a clear understanding during the operation.

【MAXSEAS 3D Printing Models Enable Clinical Applications】
MAXSEAS focuses on the personalized 3D model printing of kidney lesions, perfectly matching the requirements of the entire process of precise kidney preservation surgery:

1. 1:1 Replication of lesion anatomy, visualization of preoperative assessment

Based on the patient's imaging data, the overall shape of the kidney, the boundaries of the tumor, the branches of various blood vessels, and the structure of the collecting system are restored. Compared with computer three-dimensional drawings, the physical model has a more intuitive touch sensation and a clearer spatial hierarchy. The team can collectively assess the safety distance of the resection margin and determine whether an uninterrupted blood flow non-invasive resection plan is suitable.

2. Preoperative simulation and planning to optimize the surgical path

Doctors can pre-plan the extent of tumor resection, the method of wound hemostasis, and the placement of ultrasound hemostasis patches on the physical model, predict the risk of vascular injury in advance, customize personalized non-invasive suturing or ultrasound hemostasis strategies, and reduce the risk of unexpected events during the operation.

3. Standardized medical training and practice

Batch production of standardized anatomical models for kidney tumor-preserving surgeries, which are used for young physicians to learn tumor localization, wound handling, vascular identification, and to familiarize themselves with the operation logic of non-invasive suturing and ultrasound-guided hemostasis, thereby shortening the learning curve for kidney-preserving surgeries.

4. Simplify doctor-patient communication and enhance diagnostic consensus

Utilize physical models to visually explain the location of the tumor, the advantages and disadvantages of the two suture hemostasis methods, the value of kidney preservation and the surgical risks. Clearly explain the principle of protecting the kidney through uninterrupted blood flow, alleviate patients' anxiety, and improve the surgical cooperation rate.

【Summary】

Continuous blood flow non-invasive suture, ultrasound-guided minimally invasive hemostasis, and three-dimensional individualized preoperative planning constitute the core innovation system of contemporary precise kidney preservation surgery, effectively addressing the three major pain points of ischemic injury, suture trauma, and insufficient anatomical prediction.

MAXSEAS uses customized 3D printed kidney anatomy and tumor models to connect the implementation link from 3D planning in imaging drawings to clinical practice, assisting the surgical team to perform kidney preservation surgery more accurately and safely, while completely removing the tumor and maximizing the protection of the patient's remaining renal function.