John Matonick

Follower

Following

Public Views

InterestsView All (6)

Uploads

Papers by John Matonick

Fenestrated hemostatic patch

Device safety assessment of bronchoscopic microwave ablation of normal swine peripheral lung using robotic-assisted bronchoscopy

International Journal of Hyperthermia

Development of a clinically relevant ex vivo model of cardiac ablation for testing of ablation catheters

Journal of Cardiovascular Electrophysiology

Response of the vascular system to alteration in cardiac contractility

Proceedings of the Second Joint 24th Annual Conference and the Annual Fall Meeting of the Biomedical Engineering Society] [Engineering in Medicine and Biology

ABSTRACT It has been suggested that vascular changes parallel alteration in cardiac function. To ... more ABSTRACT It has been suggested that vascular changes parallel alteration in cardiac function. To investigate whether this is true, we used an interactive model that allows quantification of vascular parameters with changing maximum elastance (Emax) of the left ventricle. Results show that with decreasing Emax, pulse pressure and peripheral resistance increased, while total arterial compliance decreased. Thus, compromised cardiac function leads to vascular changes, but the extent of such changes however, do not parallel the percentages changes in Emax.

Local stenosis hemodynamics evaluated by a tapered blood vessel model

Proceedings of the IEEE 25th Annual Northeast Bioengineering Conference (Cat. No. 99CH36355)

ABSTRACT A computer model of a tapered blood vessel was developed to investigate the effects of a... more ABSTRACT A computer model of a tapered blood vessel was developed to investigate the effects of arterial stenosis on pulse transmission properties. Significant increases in phase velocity (Cph), characteristic impedance (ZO), and local reflection coefficients (ΓL) were found with increasing severity of the stenosis

Comparing the Water-Tight Closure of Barbed and Conventional Suture Under Static and Dynamic Conditions in an Ex-Vivo Human Knee Arthrotomy Model

Arthroplasty Today, 2021

Background Barbed suture has become popular for closure of the arthrotomy and overlying tissues i... more Background Barbed suture has become popular for closure of the arthrotomy and overlying tissues in total knee arthroplasty. STRATAFIX Symmetric PDS Knotless Tissue Control Device, a unique and novel barbed suture, with barbs formed integral to the suture core provides greater suture strength than the more common cut barbed suture designs. It is the only barbed suture commercially available with an indication in high tension areas, such as fascia. The purpose of this study was to evaluate the use of this novel barbed suture in the formation of a water-tight arthrotomy closure, using a continuous suture pattern, compared to conventional Coated VICRYL (polyglactin 910) Suture, using an interrupted suture pattern, in a cadaveric knee arthrotomy. Methods Twenty fresh-frozen cadaver knees underwent randomization to provide donor-paired matching of the knee arthrotomy closures using barbed suture in a continuous pattern or conventional suture in an interrupted pattern. Each specimen underwent 5 phases of testing that included 1) predynamic static leak testing; 2) dynamic motion leak testing; 3) postdynamic static leak testing; 4) suture release static leak testing; and 5) postsuture release dynamic motion leak testing, to assess the fluid leak rate. Results Under the initial static conditions, watertightness was similar for the 2 types of sutures. However, in all subsequent phases of testing, continuous barbed suture created a better watertight closure than interrupted conventional suture. Conclusions In this study, it was observed that closure of a knee arthrotomy using the novel barbed suture provided improved watertightness compared to conventional interrupted closure under dynamic conditions and suture release.

E~As~~~~~Y and Pulse Wave Ve

Pulse wave velocity has been widely used in the clinical assessment of the elastic properties of ... more Pulse wave velocity has been widely used in the clinical assessment of the elastic properties of arteries. The spectral content of the apparent phase velocity (ca , however, contains considerably more information of vas &r behavior than pulse wave velocity alone. We investigated the progressive changes in arterial elasticity and wave reflection during normal aging by obtaining cw from the carotid artery to the radial artery. Results show that with increasing age, the overall magnitude of caw increases and exhibits greater oscillations at higher frequencies. Both of these findings are associated with increased wave reflections. 1. INTRQDUCTTQN Pulse wave velocity has long been used as a compass in the clinical assessment of the elastic properties of arteries. A high pulse wave velocity indicates an increased arterial elastic modulus. This increased vascular stiffness in turn impedes left ventricular ejection. This has been found in patients with hypertension andlor atherosclerosis ( ...

Is Circular Fibrin Sealing of Low Rectal Anastomosis Able to Prevent Leakage in 21-Day Follow-up? Randomized Experimental Trial in Pigs

Surgical Innovation, 2019

Purpose. Clinically apparent anastomotic leakage (AL) after low anterior rectal resection (LAR;…

format_quoteFibrin glue sealant reduced anastomotic leakage rates from 20% to 0% in circular stapled colorectal surgeries after 21 days post-operation.format_quote

Download

Time-domain determination of systemic arterial properties in hypertension

American Journal of Hypertension, 2000

Download

Pressure-dependent arterial compliance in spontaneous hypertension

American Journal of Hypertension, 2000

Large-artery intima-media thickness (IMT) is considered an integrated marker for the total indivi... more Large-artery intima-media thickness (IMT) is considered an integrated marker for the total individual burden of atherosclerosis, and a graded index for cardiovascular risk. However, several different aggregate indices of IMT on B-mode ultrasound are currently used, and the optimal number of IMT readings is unsettled. In 128 newly diagnosed, never treated hypertensive subjects aged Ͻ55 y (43Ϯ8 y, office BP 152/99 mmHg, 24h BP 135/89 mmHg), we measured left ventricular mass (LVM, M-mode echo, mean of Ն5 cycles) and IMT of the common carotid, internal carotid, common femoral and superficial femoral arteries. For each segment, 12 IMT measurements (right and left side, far and near wall, 3 sampling points per segment) were performed, and the average of 1, 2, 3, 6 and 12 readings and of the 4 thickest IMTs for each segment (max) were analysed. The partial correlation coefficients of IMT with LVM progressively increased with increasing number of readings. For common carotid artery, correlation coefficients were . 28, .30, .33, .37, .38 and .47 (pϽ.0001) for the average of 1, 2, 3, 6, max and 12 readings. For common femoral artery, values were . 29, .33, .36, .43, .47, .51 (pϽ.0001). Similar trends were observed for internal carotid and superficial femoral arteries. Also correlation with 24h systolic BP improved with increasing number of readings in all segments (all pϽ.001). In summary, the association of arterial IMT with LVM and BP depends on the number of IMT readings. The average of 12 readings in each segment, including right-and left-side and far-and nearwall, carries the closest association to LVM and 24h BP, and should be used for clinical purposes.

Download

G015 Improving arterial system compliance in hypertension through increasing blood flow

American Journal of Hypertension, 1998

Download

Double balloon isolation catheters and methods therefor

Needle-to-suture ratio, as well as suture material, impacts needle-hole bleeding in vascular anastomoses

Interactive cardiovascular and thoracic surgery, 2016

The purpose of this study was to examine the influence of material variables on needle-hole bleed... more The purpose of this study was to examine the influence of material variables on needle-hole bleeding in vascular anastomoses. Material variables include suture size, needle-tip geometry and diameter, needle coating, suture material and coating and swage area. We attempted to determine whether particular suture material and a reduced needle-to-suture ratio (N:S ratio) could reduce the vessel wall defect and reduce needle-hole bleeding, without changing the suture diameter used for the anastomosis. A comparative analysis was made of the needle-hole leak rate in end-to-end anastomoses of an ePTFE®-ePTFE® vascular graft with a PROLENE® polypropylene suture with HEMO-SEAL™ technology (HS, 1.84:1 N:S ratio), standard PROLENE® polypropylene suture (polypropylene 1, 2.41:1 N:S ratio), an alternate standard PROLENE® polypropylene suture (polypropylene 2, 2.06:1 N:S ratio) and a GORE-TEX™ ePTFE® suture (ePTFE® suture, 1.4:1 N:S ratio) in an ex vivo cardiopulmonary bypass pulsatile flow loop m...

Download

Devices for Tensioning Barbed Sutures and Methods Therefor

Compliant suction surgical device

Fenestrated Hemostatic Patch