Injector

Patent metadata

Field	Value
Publication number	US-10926033-B2
Application number	US-201816221339-A
Country	US
Kind code	B2
Filing date	Dec 14, 2018
Priority date	Jun 17, 2016
Publication date	Feb 23, 2021
Grant date	Feb 23, 2021

Abstract

An injector can include an ignition device having a partition member which forms a first space to store a gunpowder and which is formed of a prescribed rigid material such that the partition member is breached based on a rise in pressure of the first space when the gunpowder is burned. The injector can also include a case including a base section fixed on a side of the ignition device. The case can be arranged in a space inside the injector main body so as to cover the ignition device. The case can define a second space with the partition member of the ignition device and encapsulate, inside the second space, a combustion product of the gunpowder. When the gunpowder burns in the ignition device and pressure inside the second space rises, a part of the case extends so as to approach a prescribed end section.

First claim

What is claimed is:

1. An injector for injecting an injection objective substance into an injection target region, the injector comprising:
an injector main body having a through-hole formed in an axial direction;
a piston section arranged so as to be slidable inside the through-hole;
a syringe section arranged on a tip side of the injector main body, the syringe section comprising a storage chamber configured to store the injection objective substance, a plunger configured to pressurize the injection objective substance inside the storage chamber as the piston section slides, and a nozzle section including a flow path through which the injection objective substance that is present inside the storage chamber and has been pressurized by the plunger flows, the nozzle configured to eject the injection objective substance from an ejection port formed at a tip of the flow path;
an ignition device comprising a partition member which forms a first space to store a gunpowder and which is formed of a prescribed rigid material such that the partition member is breached based on a rise in pressure of the first space when the gunpowder is burned; and
a case including a base section fixed on a side of the ignition device, the case arranged in a space inside the injector main body so as to cover the ignition device, the case defining a second space with the partition member of the ignition device and encapsulating, inside the second space, a combustion product generated by combustion of the gunpowder in the ignition device,
wherein the case includes:
an extending section configured to, based on a rise in pressure inside the second space by gunpowder combustion in the ignition device, extend in an approach direction in which a part of the case approaches a prescribed end section of the piston on a side opposite to an end section opposing the plunger; and
a pressing section provided in the part of the case and configured to press the prescribed end section of the piston as the extending section extends,
the injector further comprising a cushioning member provided on a prescribed inner wall surface which forms an internal space of the injector main body, the inner wall surface being in a vicinity of an end surface of the through-hole and opposing the part of the case, and when the extending section is extended by gun owder combustion in the inition device, the extending section comes into contact with the cushioning member and the extension of the extending section is stopped.

2. The injector according to claim 1 , further comprising a gas generating agent stored inside the second space and configured to generate a prescribed gas by combustion, and
wherein the extending section is configured such that the part of the case extends in the approach direction as pressure inside the second space rises in response to gunpowder combustion in the ignition device and combustion of the gas generating agent.

3. The injector according to claim 1 , wherein the extending section is formed in a side wall section of the case opposing an inner wall surface that extends in an axial direction of the injector main body so as to be folded in a bellows shape in a state prior to gunpowder combustion in the ignition device, and wherein the extending section is configured so as to extend in the axial direction in response to gunpowder combustion in the ignition device.

4. The injector according to claim 1 , wherein the part of the case is an end surface on a tip side of the case, and wherein an area of the tip-side end surface of the case is formed larger than an end surface area of the prescribed end section of the piston section.

5. The injector according to claim 1 , wherein the part of the case is thicker than the remaining portions of the case.

6. The injector according to claim 1 , wherein a reinforcing plate having a prescribed thickness is provided inside or outside the case in the part of the case.

7. The injector according to claim 1 , wherein the case is arranged inside the injector main body so that the pressing section comes into contact with the prescribed end section of the piston section in a state prior to gunpowder combustion in the ignition device.

8. An injector for injecting an injection objective substance into an injection target region, the injector comprising:
an injector main body having a through-hole formed in an axial direction;
a piston section arranged so as to be slidable inside the through-hole;
a syringe section arranged on a tip side of the injector main body, the syringe section comprising a storage chamber configured to store the injection objective substance, a plunger configured to pressurize the injection objective substance inside the storage chamber as the piston section slides, and a nozzle section including a flow path through which the injection objective substance that is present inside the storage chamber and has been pressurized by the plunger flows, the nozzle configured to eject the injection objective substance from an ejection port formed at a tip of the flow path;
an ignition device comprising a partition member which forms a first space to store a gunpowder and which is formed of a prescribed rigid material such that the partition member is breached based on a rise in pressure of the first space when the gunpowder is burned; and
a case including a base section fixed on a side of the ignition device, the case arranged in a space inside the injector main body so as to cover the ignition device, the case defining a second space with the partition member of the ignition device and encapsulating, inside the second space, a combustion product generated by combustion of the gunpowder in the ignition device,
wherein the case includes:
an extending section configured to, based on a rise in pressure inside the second space by gunpowder combustion in the ignition device, extend in an approach direction in which a part of the case approaches a prescribed end section of the piston on a side opposite to an end section opposing the plunger, and
a pressing section provided in the part of the case and configured to press the prescribed end section of the piston as the extending section extends, and
wherein the injector is configured such that, in a state where the extending section is extended to the maximum in response to gunpowder combustion in the ignition device, a prescribed gap is present between the pressing section of the part of the case and a prescribed inner wall surface opposing the pressing section and forming an internal space of the injector main body, the inner wall surface being in a vicinity of an end section of the through-hole and opposing the part of the case.

9. The injector according to claim 8 , wherein the pressing section of the part of the case is larger in width than that of the prescribed end section of the piston.

10. The injector according to claim 8 , wherein the internal space of the injector main body is larger in width than that of the prescribed end section of the piston.

11. The injector according to claim 8 , wherein the internal space of the injector main body houses the case such that a sidewall section of the case does not contact an inner wall of the internal space of the injector main body facing the sidewall section of the case.

12. The injector according to claim 11 , wherein an inner wall of the injector main body does not contact an outer wall of the internal space facing the inner wall of the injector main body.

Assignees

• Daicel Corp

Inventors

• Masumoto Takaya

Classifications

• F42B12/54

  by implantation, e.g. hypodermic projectiles · CPC title

• A61M5/30

  Syringes for injection by jet action, without needle, e.g. for use with replaceable ampoules or carpules · CPC title

• F42B3/04

  for producing gas under pressure {(generators of inflation fluid especially adapted for vehicle air bags B60R21/26)} · CPC title

• F42B3/006

  Explosive bolts; Explosive actuators (explosive valves F16K13/06; explosive cutting B23D15/145; explosive switches H01H39/00; pyrotechnical actuators F15B15/19) · CPC title

• A61M5/2046 Primary

  Media being expelled from injector by gas generation, e.g. explosive charge · CPC title