Therapeutic instrument and attachment thereof

1. A therapeutic instrument for storing and delivering a sheet-type therapeutic substance, the therapeutic instrument comprising:

a nozzle member having a tubular part defining an inner surface, a storage space that is configured to store the therapeutic substance in a deformed state, a tip end with an opening extending therethrough for charging and discharging the therapeutic substance, and a rear communication part for communicating with the storage space;

a flexible support member that is configured to support the sheet-type therapeutic substance and is movable relative to the nozzle member between a retracted position where a portion of the inner surface of the tubular part deforms the flexible support member and an extended position where the flexible support member is located outside the tubular part;

a stopper, which is movable relative to the nozzle member, that engages the portion of the inner surface of the tubular part that deforms the flexible support member to create an air-tight seal between the stopper and the nozzle member at a location adjacent to the tip end;

a needle member, which is movable with the stopper, having a hollow needle part with an open tip end that is located outside of the flexible support member; and

a pressure generator that selectively generates a negative pressure and a positive pressure within the tubular part of the nozzle member between the stopper and the tip end,

wherein the negative pressure draws the therapeutic substance into the tubular part, and

wherein the positive pressure pushes the therapeutic substance out of the tubular part when the therapeutic substance stored in the tubular part.

2. The therapeutic instrument according to claim 1 , wherein the needle member is secured to the flexible support member and the hollow needle part inserted into the tubular part of the nozzle member through the rear communication part.

3. The therapeutic instrument according to claim 2 , wherein the support member comprises a tongue-like member having a planar developed shape in a state that the tip end of the needle part is protruded to outside of the tubular part, and having a shape deformed into a roll-shape in contact with an edge of the opening of the tubular part when the tip end of the needle part is retracted into the tubular part through the opening.

4. The therapeutic instrument according to claim 2 , wherein the rear communication part is a hole provided on the rear end of the tubular part, and the needle part is engaged with the hole.

5. The therapeutic instrument according to claim 2 , wherein the stopper is engaged with the needle part and fixed thereto and moves through the tubular part together with the needle part while air-tightly sealing the storage space in the tubular part.

6. The therapeutic instrument according to claim 2 , further comprising

a holding member having a first holding part that holds the nozzle member in a state that the nozzle member and the needle member are allowed to move relatively to each other, and a second holding part that holds a base part of the needle member in a fixed state.

7. The therapeutic instrument according to claim 6 , wherein the holding member has a unit for regulating a movement terminal end position when the nozzle member and the needle member are relatively moved.

8. The therapeutic instrument according to claim 2 , comprising an attached unit for causing the negative pressure to act in the tubular part by a relative movement of the nozzle member and the needle member.

9. The therapeutic instrument according to claim 8 , wherein the pressure generator has a movable part that selectively causes the negative pressure and the positive pressure to act in the tubular part of the nozzle member through the hole, and the attached unit includes a first moving unit that relatively moves the nozzle member and the needle member; a second moving unit that moves the movable part of the pressure generator; and a driving unit that concurrently moves the first moving unit and the second moving unit.

10. The therapeutic instrument according to claim 9 , wherein the driving unit moves the first moving unit and the second moving unit, so that the second moving unit starts to move the movable part of the pressure generator, after the first moving unit starts to move the nozzle member and the needle member relatively.

11. The therapeutic instrument according to claim 8 , wherein the attached unit is composed of the stopper engaged with the needle part and fixed thereto, and the stopper causes the negative pressure to be generated in the tubular part by integral movement of the nozzle member and the needle part in the tubular part while air-tightly sealing the storage space in the tubular part, when the nozzle member and the needle member are relatively moved so as to retract the support member into the tubular part.

12. The therapeutic instrument according to claim 11 , wherein the support member is formed integrally with the stopper.

13. The therapeutic instrument according to claim 1 , wherein the negative pressure draws the therapeutic substance and a liquid on the therapeutic substance into the tubular part, and the positive pressure pushes the therapeutic substance and liquid out of the tubular part.

14. The therapeutic instrument according to claim 1 , wherein the pressure generator comprises a syringe unit having a syringe and a plunger.