Aspects herein relate to a medical device for providing a leak-resistant seal for use in a vascular access device. In various embodiments, a device for vascular access hemostasis is included. The device can include an enclosure configured to at least partially receive a medical device, the enclosure defining a cavity. The enclosure can have a first seal portion and a second seal portion, the cavity disposed between the first seal portion and the second seal portion. The enclosure can include the second seal portion comprising a split, septum seal. The enclosure can include a barrel in structural communication with the second seal portion. The device can include a constriction ring disposed around the barrel, the constriction ring interfacing with the second seal portion to limit movement of the split, septum seal.

A surgical access device includes a seal assembly having an outer seal housing, an inner seal housing, and a seal cooperating with the inner seal housing, the outer seal housing defining a central longitudinal axis and having a longitudinal passage for receiving at least one surgical object therethrough. The surgical access device also includes a bellows configured to engage at least a portion of the inner seal housing cooperating with the seal, the bellows dimensioned and adapted to establish a biasing relationship with the seal. The seal is adapted for lateral movement relative to the central longitudinal axis of the outer seal housing and the bellows is configured to be attached to a proximal wall of the outer seal housing.

An introducer sheath assembly (10) having a sheath tube (12), a hub (16), a valve (30) and a valve-retaining cap (50) on the proximal end of the hub. The cap (50) is so secured to the hub (16) as to have a closed, locked position and also an open position permitting access to the interior of the hub and the valve (30) while the cap (50) remains secured to the hub (16).

Blood sample optimization systems and methods are described that reduce or eliminate contaminates in collected blood samples, which in turn reduces or eliminates false positive readings in blood cultures or other testing of collected blood samples. A blood sample optimization system can include a blood sequestration device located between a patient needle and a sample needle. The blood sequestration device can include a sequestration chamber for sequestering an initial, potentially contaminated aliquot of blood, and may further include a sampling channel that bypasses the sequestration chamber to convey likely uncontaminated blood between the patient needle and the sample needle after the initial aliquot of blood is sequestered in the sequestration chamber.

Disclosed herein are hemostasis seals with low pass-through friction force. The disclosed seals are configured for use with transcatheter delivery systems or vascular access sheath systems. The seals are a unitary design that provide low pass-through friction when passing a catheter through the seal. The specifics of the design that provides the desirable low pass-through friction include the physical configuration of the seals and the material used for the seals. The disclosed seals include an outer portion, an inner annular portion, and a webbing portion connecting the outer portion to the inner annular portion, forming a suspended O-ring. The suspended O-ring provides an opening through which a delivery device can be passed and applies a relatively low friction force on the delivery device as it is passed through the opening.

A delivery catheter including a valve body having a closeable valve opening for introducing a medical device in insertion direction into, in particular, a blood vessel, the valve opening, when a medical device is not introduced, tapering in the insertion direction, and a sealing section, which in a closed position at least in sections is subject to a pretension, directly adjoins the taper, so that the sealing section, when a medical device is introduced, is actuated from the closed position into an open position in such manner that the sealing section encloses the medical device in a substantially fluid-tight manner.

The invention discloses a trocar seal membrane with concave-channel structure. Said seal membrane comprises a proximal opening, a distal aperture, and a sealing wall from the distal aperture extending to the proximal opening, said sealing wall comprising a proximal surface and a distal surface, said distal aperture formed by a scaling-lip for accommodating the inserted instrument and formed a gas-tight seal, said sealing-lip comprising a longitudinal axis and a transverse plane substantially perpendicular to said axis. In the lip-adjacent area, said sealing wall comprises the main rotary-wall and a plurality of concave-channel each of the concave-channels includes two side sealing-walls, which are defined by both edges and extending laterally outward from the sealing-lip and gradually widening. Said concave-channels have the functions of enlarging hoop circumference, reducing the wrapped area, improving lubrication reliability, increasing the axial tensile stiffness, etc., thereby, greatly reducing the frictional resistance and the stick-slip.

The invention discloses a trocar seal membrane with multi-dimensional pleats. Said seal membrane comprises a proximal opening, a distal aperture, and a sealing wall from the distal aperture ex-tending to the proximal opening, said sealing wall comprising a proximal surface and a distal surface. Said distal aperture formed by a sealing lip for accommodating the inserted instrument forms a gas-tight seal. In the lip-adjacent area, the sealing wall simultaneously has a plurality of transverse pleats extending laterally outwardly from the sealing lip and a plurality of tangential pleats uniformly distributed around the sealing lip. The pleated sealing wall can enlarge hoop circumference in the lip-adjacent area, and reduce overall deformation when a large-diameter instrument is inserted, thereby reducing friction and improving sealing reliability.

A catheter assembly includes a hollow catheter; a catheter hub fixed onto a base end portion of the catheter, the catheter hub having an internal passage communicating with an inside of the catheter; a needle disposed in the catheter; a needle hub; a valve element including an opening and closing unit configured to be opened and closed; an operation member including a tubular body, the operation member being configured such that an opening portion of the operation member is insertable into the opening and closing unit to cause the base end side and a tip side of the catheter hub to communicate with each other; a communication unit; and a sealing member including a tubular body, the sealing member being disposed at a base end side of the valve element and being configured to allow the passage of air and prohibit the passage of liquid.

The outer tube includes two insertion holes which are formed in a cross-sectional D-shape via a partition wall provided in the central part in a cross-section vertical to respective axial directions of the insertion holes. A slit of a valve body located in the insertion hole is disposed along reference line passing through centers of respective arcs of the insertion holes as seen from the axial directions of the insertion holes. Therefore, two leaflets of the slit abut on an arc edge of the insertion hole and a D-shaped cut part of the partition wall respectively when the insertion part of the treatment tool is internally fitted, and they are deformed into the same shape. Since there is no difference in stress applied to two leaflets, it is possible to secure the airtightness by the slit over a long period of time.