# US 2025/0144299 A1 · Method and apparatus to reduce the deadspace in syringes and small-bore devices

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- Number: US 2025/0144299 A1
- Document ID: US20250144299A1
- Status: Published application
- Kind: A1
- Application number: 19/000,786
- Filed: 2024-12-24
- Published: 2025-05-08
- Earliest claimed: 2021-10-29
- Inventors: Thomas C. KURACINA
- Web page: https://patentgrep.com/patent/US20250144299A1

## CPC

- A61M 5/3129: {Syringe barrels (A61M5/3205, A61M5/50 take precedence)}
- A61M 5/3134: {characterised by constructional features of the distal end, i.e. end closest to the tip of the needle cannula}
- A61M 5/32: Needles; Details of needles pertaining to their connection with syringe or hub (infusion needles A61M5/158); Accessories for bringing the needle into, or holding the needle on, the body; Devices for protection of needles
- A61M 5/34: Constructions for connecting the needle {, e.g. to syringe nozzle or needle hub (connecting catheter tubes to hubs A61M25/0014)}
- A61M 5/345: {Adaptors positioned between needle hub and syringe nozzle}
- A61M 5/3293: {characterised by features of the needle hub}
- A61M 5/347: {rotatable, e.g. bayonet or screw (A61M5/344 takes precedence)}
- A61M 2005/1787: {Syringes for sequential delivery of fluids, e.g. first medicament and then flushing liquid}
- A61M: DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY (introducing media into or onto the bodies of animals A61D7/00; means for inserting tampons A61F13/26; devices for administering food or medicines orally A61J; containers for collecting, storing or administering blood or medical fluids A61J1/05); DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY (surgery A61B; chemical aspects of surgical articles A61L); DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR {(Electrotherapy, e.g. producing anaesthesia by the use of alternating or intermittent currents A61N1/36021)}

## Abstract

Methods and apparatus to reduce deadspace in syringes and other devices with the use of volume displacing members that occupy space within one or more interior spaces of such devices. The volume displacing members are also equipped with one or more internal flow passages that facilitate a flow of a fluid through it. The volume displacing members are also adapted to cooperate with features of the devices that house them to form air-tight and liquid-tight seals that at least partially determine a fluid pathway through the devices.

## Claims

### Claim 1

A syringe comprising:
a hollow barrel configured to store a liquid or gas in an interior cavity therein;
a male nozzle extending distally from the hollow barrel and having an interior cavity with an inside diameter defined by an interior wall of the male nozzle; and
a volume displacing member disposed inside at least a portion of the interior cavity of the male nozzle and configured to reduce the cubic volumetric capacity inside the interior cavity of the male nozzle available for accommodating the liquid or gas, the volume displacing member including a body with an exterior wall having an outside diameter sized to form a liquid-tight and air-tight seal with the interior wall of the male nozzle, having a through passage that includes a first opening and a second opening distal to the first opening, the first opening being in fluid communication through the flow path with the interior cavity of the hollow barrel, the first opening being located off-center in a proximal end of the volume displacing member.

### Claim 2 (depends on 1)

The syringe according to claim 1, wherein the interior cavity of the male nozzle has a uniform or substantially uniform inside diameter and the exterior wall of the body of the volume displacing member having a uniform or a substantially uniform outside diameter.

### Claim 3 (depends on 1)

The syringe according to claim 1, wherein the second opening being located at the end wall of the distal portion of the body.

### Claim 4 (depends on 3)

The syringe according to claim 3, wherein a flow path configured to accommodate a flow of the liquid or gas exists between an outside facing wall of the sidewall channel of the volume-displacing member and the interior wall of the male nozzle.

### Claim 5 (depends on 4)

The syringe according to claim 4, wherein a flow path configured to accommodate a flow of the liquid or gas exists between the interior cavity of the sidewall channel and the interior wall of the interior cavity of a hollow distal portion.