Clinical outcomes after balloon angioplasty with Crosser device for heavily calcified common femoral and popliteal artery disease

Design, Optimization, and Modeling of a Hydraulic Soft Robot for Chronic Total Occlusions

Chronic total occlusion (CTO) is one of the most severe and sophisticated vascular stenosis because of complete blockage, greater operation difficulty, and lower procedural success rate. This study proposes a hydraulic-driven soft robot imitating the earthworm's locomotion to assist doctors or operators in actively opening thrombi in coronary or peripheral artery vessels. Firstly, a three-actuator bionic soft robot is developed based on earthworms' physiological structure. The soft robot's locomotion gait inspired by the earthworm's mechanism is designed. Secondly, the influence of structure parameters on actuator deformation, stress, and strain is explored, which can help us determine the soft actuators' optimal structure parameters. Thirdly, the relationship between hydraulic pressure and actuator deformation is investigated by performing finite element analysis using the bidirectional fluid-structure interaction (FSI) method. The kinematic models of the soft actuators are established to provide a valuable reference for the soft actuators' motion control.

JETWING technique: Combination therapy of JETSTREAMⓇ and aggressive wire recanalization in calcified atheroma and dilatation technique for eccentric heavy calcified plaques using WINGMAN for insertion of protection wire

Although endovascular treatment (EVT) has developed and still progressing, calcified lesions remain a big challenge to operators in obtaining good results. Whenever, the eccentric and calcified plaques or nodules are present, balloon dilatation may be difficult and vascular complications may frequently occur. We present a 73-year-old woman, with severe, eccentric, calcified lesion in the right superficial femoral artery (SFA). First, we performed the aggressive wire recanalization in calcified atheroma and dilatation (ARCADIA) technique for the eccentric plaques. Then, we used a WingmanⓇ crossing catheter (ReFlow Medical, Inc.) to penetrate and pass through the calcifications and eventually exchanged to a ParachuteⓇ (Good Care, Inc.) filter wire. Finally, we performed rotational atherectomy using the JETSTREAMⓇ (Boston Scientific) rotational atherectomy device for debulking to obtain good lesion expansion and was able to avoid potential complications. Performing ARCADIA technique then using a Wingman catheter for inserting a filter wire before JETSTREAMⓇ atherectomy is safe and effective for heavily calcified, eccentric lesions. Further studies will be needed to validate the safety and efficacy of this approach.

Objective Evaluation With Noncontrast Computed Tomography Can Reveal Calcified Plaque Solidity in Peripheral Artery Diseases

PURPOSE

The presence of severely calcified plaque remains problematic in endovascular therapy, and no specific endovascular treatment strategy has been established. Estimating plaque solidity before the procedure may help operators penetrate calcified plaque with a guide wire. The aim of this study was to establish a method of measuring plaque solidity with noncontrast computed tomography (CT).

METHODS

This retrospective, single-center study included consecutive patients who, between October 2020 and July 2022, underwent noncontrast 5 mm and 1 mm CTs before endovascular therapy to penetrate calcified plaque with a wire in the common femoral, superficial femoral, and popliteal arteries. Three cross-sectional CT slices were selected. To target a calcified plaque lesion, the operator identified a region of interest, which corresponded to 24×24 pixels, and Hounsfield unit (HU) values of each pixel were displayed on the CT image. The average HU values and the ratio of number of pixels of lower values (130-599 HU) represented plaque solidity. We used the Mann-Whitney-Wilcoxon rank-sum test and the chi-square test to compare the solidity of plaques penetrated and not penetrated by the wire.

RESULTS

We evaluated 108 images of 36 calcified plaque lesions (in 19 patients). The wire penetrated 28 lesions (77.8%) successfully. The average HU value was significantly lower in the lesions that the wire penetrated than in the others, in both the 5 mm CT slices (434.7±86.8 HU vs 554.3±112.7 HU, p=0.0174) and 1 mm slices (497.8±103.1 HU vs 593.5±114.5 HU, p=0.0381). The receiver operating curve revealed that 529.9 and 533.9 HU in the 5 and 1 mm slices, respectively, were the highest values at which wires could penetrate. Moreover, at the lesions that were penetrates successfully, the ratio of number of lower HU value pixels was significantly higher both in 5 mm slice CTs (74.7±13.4 vs 61.7±13.1%, p=0.0347) and 1 mm (68.7±11.8 vs 57.1±11.4%, p=0.0174).

CONCLUSION

The use of noncontrast CT to evaluate plaque solidity was associated with successful wire penetration of calcified lesions in peripheral arteries.

CLINICAL IMPACT

This study revealed an association between the wire penetration inside calcified plaque and plaque solidity estimated using non-contrasted computed tomography. The mean Hounsfield unit values of three cross-sections in calcified plaques were associated with the successful wire penetration. This wire penetration difficulty is associated with extended procedure time, excessive radiation exposure, usage of extra contrast agents, and increased medical costs. Therefore, estimating calcified plaque solidity before procedure enables us to choose effective and lean procedures. In addition, to predict the success of dilating calcified plaque from the inside is also beneficial when the operator wants to avoid extra scaffold implantation for target lesions.

A novel endovascular method of atherectomy for calcified common femoral and popliteal disease using the crosser system: Crossbow and Rambow techniques

OBJECTIVES

This study aims to report the efficacy and safety of new atherectomy methods using the Crosser system for calcified lesions in the common femoral and popliteal artery: the Crosser system supported by bended 0.014 wire (Crossbow) technique and retrograde approach of sheathless Crosser system supported by bended 0.014 wire (Rambow) technique.

MATERIALS AND METHODS

This report describes a single-center, retrospective study. A total of 23 patients (mean ± SD age, 73 ± 10 years; 19 men) with symptomatic peripheral artery disease received the Crossbow technique and Rambow technique for treatment of calcified common femoral and popliteal disease; these patients were enrolled between October 2013 and October 2015. The primary efficacy outcome was acute technical success, defined as achievement of residual stenosis < 30% for stenting and < 50% for angioplasty or atherectomy. The primary safety outcome was assessed on the basis of angiographic complications.

RESULTS

The Crossbow and Rambow techniques were undertaken in 100% and 17% of the patients, respectively. Acute technical success was achieved in 96% of the patients. There were two embolic events.

CONCLUSION

Crossbow and Rambow techniques could be effective atherectomy methods of calcified common femoral and popliteal disease. Regarding safety, embolic protection devices may be needed for our atherectomy methods.

Percutaneous debulking strategy for severe nodular calcification in common femoral artery

BACKGROUND

Despite marked progress in endovascular treatment (EVT) techniques and devices, calcified lesions remain one of the toughest obstacles to EVT success. Moreover, because the common femoral artery (CFA) is known as a "non-stenting zone," endovascular strategies for this area are controversial.

CASE PRESENTATION

Here we describe the technical tips for a novel, less invasive, and effective debulking strategy for severe nodular calcification using an endovascular maneuver. This technique was demonstrated in a 73-year-old man with severe calcified stenosis of the CFA. To complete a stent-less strategy for CFA, we conducted aggressive debulking of the nodular calcification, established a bidirectional approach from the radial artery and the superficial femoral artery (SFA), and inserted a balloon-guiding catheter in the SFA. Under distal protection provided by this catheter, we crushed the nodular calcification 43 times using myocardial biopsy forceps. After achieving a volume reduction of nodular calcification through this maneuver, we completed the procedure by inflating a 6-mm drug-coated balloon catheter. Final angiography demonstrated a reduced filling defect of the contrast medium in the CFA and favorable blood flow as far as the ankle. The puncture site on the SFA was closed with a vascular suture assisted by balloon inflation inside the vessel, which allowed the patient to be ambulatory immediately after the procedure without requiring bed rest.

CONCLUSIONS

Severely calcified lesions in the CFA are usually difficult to treat using an endovascular strategy, but our novel and less invasive method may become a promising technique for managing these lesions.

Increased thrombogenicity is associated with revascularization outcomes in patients with chronic limb-threatening ischemia

OBJECTIVES

Clinically driven target lesion revascularization (CD-TLR) frequently occurs after endovascular therapy (EVT) in patients with chronic limb-threatening ischemia (CLTI). The total thrombus-formation analysis system (T-TAS) can quantitatively evaluate thrombogenicity. Therefore, we aimed to elucidate the association of T-TAS parameters with CD-TLR.

METHODS

We analyzed 34 CLTI patients and 62 Non-CLTI patients who underwent EVT. Blood samples collected on the day of EVT were used in T-TAS to compute the thrombus formation area under the curve (PL₂₄-AUC₁₀ in the platelet chip and AR₁₀-AUC₃₀ in the atheroma chip). After the EVT procedure, clinical follow-up was performed, and the presence of CD-TLR was assessed.

RESULTS

During the follow-up period (median 574 days), 10 patients (29%) in the CLTI group and 11 patients (18%) in the Non-CLTI group showed CD-TLR. In the CLTI group, patients who showed CD-TLR had a higher AR₁₀-AUC₃₀ than those who did not (1694 [1657, 1799] vs. 1561 [1412, 1697], p=0.01). In contrast, the PL₂₄-AUC₁₀ showed no significant differences depending on CD-TLR in both groups. For the CLTI patients, multivariable Cox regression analysis using propensity scores revealed that the AR₁₀-AUC₃₀ was an independent predictor of CD-TLR even after adjusting for baseline demographics, lesion characteristics, and anticoagulant use (HR=2.04, 95%CI=1.18-3.88, p=0.01; per 100 increase). In contrast, in Non-CLTI patients, neither the AR₁₀-AUC₃₀ and nor the PL₂₄-AUC₁₀ was significantly associated with CD-TLR. Receiver operating characteristics curve analysis identified an AR₁₀-AUC₃₀ level of 1646 as an optimal cutoff value to predict CD-TLR (AUC = 0.85, sensitivity = 0.93, specificity = 0.56).

CONCLUSIONS

In CLTI patients, but not in Non-CLTI patients, the AR₁₀-AUC₃₀ showed a potential to predict CD-TLR. This finding suggests that hypercoagulability may play a predominant role in the progression of CLTI and anticoagulants may be useful in preventing revascularization.

Validation of the correlation between angiosome-based target arterial path, mid-term limb-based patency, and the global limb anatomical staging system

This study aimed to validate the correlation between the Global Limb Anatomical Staging System (GLASS) and limb-based patency (LBP) and angiosome-based target arterial path (TAP) and to detect the predictors of LBP loss. After the publication of the Global Vascular Guidelines in 2019, the evaluation of GLASS and identification of TAP have been recommended. However, there are few reports regarding GLASS. Eighty-three patients with chronic limb-threatening ischemia (CLTI) and tissue loss from 2016 to 2020 were evaluated. The correlation between GLASS and LBP and successful revascularization of angiosome-based TAP was analyzed. We also investigated the predictors of LBP loss. The number of patients in each GLASS stage was as follows: GLASS I, 6 patients; GLASS II, 15 patients; GLASS III, 62 patients. At 6 months, the Kaplan-Meier estimate of LBP was 66.7% in GLASS I, 41.6% in GLASS II, and 16.4% in GLASS III, respectively (p = 0.034). The rate of successful revascularization of angiosome-based TAP was 100% in GLASS I, 86.7% in GLASS II, and 46.8% in GLASS III, respectively (p = 0.002). Multivariate analysis showed that the Wound, Ischemia, and foot Infection (WIfI) stage [hazard ratio (HR) 1.58; 95% confidence interval (CI) 1.07-2.33; p = 0.021] and GLASS infrapopliteal (IP) grade (HR 1.96; 95% CI 1.31-2.95; p = 0.001) were the independent predictors of LBP loss. The GLASS stage was significantly correlated with successful revascularization of angiosome-based TAP and mid-term LBP. The WIfI stage and GLASS IP grade were the independent predictors of loss of LBP.